1979-2016intimation to SRPC. The status regarding the same shall be discussed in meeting. Review...

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Text Box

1979-2016

Agenda for the 90th

Meeting of PCSC scheduled to be held on 27

th May, 2020 (through VC/Online) Page 1

Southern Regional Power Committee Bengaluru

Agenda for the 90th Meeting of Protection Coordination

Sub-Committee of SRPC to be held on 27th May, 2020 through VC/Online

1. Introduction

2. Confirmation of Minutes of last PCSC meeting

Confirmation of minutes of 89th Protection Coordination Sub-Committee meeting held on 13-14 February 2020.

3. Grid Occurrences

3.1 Grid Disturbances (GD), Grid Incidences (GI), trippings due to failure of Auto-reclosing

(A/R) and mal-operation of PLCC equipment that occurred during the period January - March, 2020, given at Annexure-I, would be discussed in the PCSC meeting.

Constituents are requested to furnish the following information in respect of the above grid occurrences to have fruitful discussions:

(a) Detailed analysis of the events along with SLD or equivalent pictorial

representation clearly showing (i) Location of the fault, and (ii) Bus-bar

arrangement/ Configuration of feeders and other connected equipment with

proper CB positions (OPEN/ CLOSE) at the time of occurrence of the fault along

with records of Event loggers, Disturbance recorders.

(b) Remedial Action(s) taken.

(c) Relay setting details.

Constituents are requested to furnish full particulars of the tripping events pertaining to their system, preferably in the form of power point presentation, well

in advance (latest by 22-05-2020) to the scheduled meeting date, to take up for

discussion in the meeting.

3.2 In compliance of Regulations 5.2 (r) of IEGC, the Constituents are required to furnish the following information in respect of Grid Occurrences within 24 hr. of occurrence of the same to SRLDC/ SRPC: (a) First Information Report (FIR) (b) Event Logger (EL) output (c) Disturbance Recorder (DR) output (d) Trip event analysis report (with pre and post fault system conditions) Non-furnishing of tripping details (FIR/DR/EL/TR) for the period 16.01.2020 – 30.04.2020 had been brought to Constituents’ notice vide the following SRPC letters: (i) No. SRPC/ SE-III/ PCSC/ 2019-20/ 642 - 52 dated 24.01.2020,

Agenda for the 90th



(ii) No. SRPC/ SE-III/ PCSC/ 2019-20/ 1051 - 62 dated 11.02.2020, (iii) No. SRPC/ SE-III/ PCSC/ 2019-20/1219 - 32 dated 25.02.2020, (iv) No. SRPC/ SE-III/ PCSC/ 2019 - 20/1670 - 77 dated 12.03.2020, (v) No. SRPC/ SE-III/ PCSC/ 2019 - 20/1832 – 43 dated 23.03.2020, (vi) No. SRPC/ SE-III/ PCSC/ 2019 - 20/ dated 15.04.2020, (vii) No. SRPC/ SE-III/ PCSC/ 2020/1864 - 76 dated 21.04.2020 and (viii) No. SRPC/ SE-III/ PCSC/ 2020/1912 - 23 dated 08.05.2020,

Non-compliance in this regard would be discussed in the meeting.

4. Submission of Reports/ Compliance by Constituents

4.1 Status of implementation of Recommendations of Protection Coordination

Sub-Committee (PCSC)-89 Status of implementations of recommendations of PCSC-89 shall be presented by

constituents in forthcoming PCSC. 4.2 Status of implementation of Recommendations Protection Coordination

Sub-Committee (PCSC), which are pending

The status of implementation of PCSC recommendations (up to 89th PCSC meeting), which are pending is given at Annexure-II. The latest status on the same may please be sent latest by 20.05.2020, to place the same before the sub-committee.

4.3 Remedial measures for "Transmission Elements under Forced Outage"

The Constituents are requested to furnish the remedial measures/ actions taken by them for the tripping events, as circulated vide this office emails (Annexure-III), to discuss the same.

The tripping events are based on the daily reports at SRLDC website http://srldc.in/Reports.aspx under the menu: Reports->Daily-> "TL under Forced Outage").

4.4 Certificate for Healthiness of Batteries

As per the MoP direction, given in pursuant to recommendations of the Enquiry Committee (NEW grid disturbance on 30th & 31st July, 2012), the monthly certificate for healthiness of batteries, installed at 220 KV and above voltage level Substations (for power supply to Relays, RTUs and PLCC equipment) are required to be obtained by RPCs from their respective Constituents and furnish the same to CEA/ MoP.

With reference to above, the Constituents have been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC Secretariat.

The sought status for the month of January - April, 2020 is awaited from the following SR-Constituents:

January : UPCL and SEL February: NTPC (Rmgdm, Kymklm and Simhadri), UPCL and NTECL March : APGENCO (Thermal), KPTCL,TPCIL, MEPL, NTPL and NTPC (Rmgdm)

The non-reporting of status of healthiness of batteries may be discussed.

http://srldc.in/Reports.aspx

Agenda for the 90th



5. Protection Management system (PMS) project

Protection Database Management System (PDMS) portal of PMS project achieved “Go-

Live” on 20th

January 2020. The same was communicated to constituents vide SRPC mail

dated 20.01.2020. It was also requested to scrutinize the relay settings uploaded in PDMS

constituents. All constituents were to communicate the feedback to SRPC and intimate the

changes through DMNS. In this regard reminder mail was send vide SRPC mail dated

17.04.2020. Consolidated comments regarding relays settings of all substations have been

received only from KSEBL.

Constituents are requested to scrutinize the PDMS data on priority and

communicate correctness of data through mail to PRDC & SRPC before 20th

May 2020

and discrepancies in the data noticed, if any, shall be submitted through DMNS, with

intimation to SRPC. The status regarding the same shall be discussed in meeting.

Review meeting of PMS to verify the pending SAT features of PSCT was held in SRPC

Bengaluru on 12.03.2020 and 18.03.2020. During the meeting PRDC demonstrated

transient simulation for the following protection functions on Bus branch database of SR

network:

Bus Bar Differential Protection

Line/Cable Differential Protection

Transformer over fluxing Protection

Transformer Restricted Earth Fault Protection

Generator Differential Protection

Generator Reverse Power Protection

Generator Negative Sequence Protection.

Distance relay performance during power swing – This was demonstrated on test

system

As per the Record Notes of meeting PRDC shall be attending two pending features and 28

pass with remarks features immediately.

On completion of the two pending features and 28 pass with remarks features the project

could Go-Live. Hence, all utilities/users are requested to verify the data as well as

PSCT features thoroughly and report the same on urgent basis so that shortcomings, if

any, may be brought to the notice of the project implementer (i.e., M/s. PRDC) for

necessary correction/tweaking before the project is Going Live.

6. Protection Audit

6.1. Protection Audit of various 220kV & above stations in Southern Region

The recommendations of protection audit of various 220kV & above stations in

Southern Region held during October – December 2019 were compiled and were

circulated, utility wise, vide SRPC mail dated 21st April 2020. It was brought to the

notice of constituents that the observations/ Recommendations were categorised by

the PCSC as “To be implemented”, “Desirable”, “Optional” and “Drop” taking into

account primacy of system protection aspects.

The constituents were requested to comply the recommendations categorised as “To

be implemented” in a time bound manner and report to SRPC, so that the

compliance of the same could be submitted to CERC, through periodic (bi-monthly)

reports. Status regarding the compliance of such recommendations may please be

informed by 15th

May 2020.

Agenda for the 90th



It was also informed that the observations/recommendations categorised as “Drop”

were generally the aspects which, are consistent with best practice and already

available/implemented in the substation. The categorisation no way implied that the

observations/recommendations are disregarded.

The utilities were requested to make sincere efforts to comply with the

recommendations categorised as “Desirable” and “Optional”, as the same are the

considered recommendations of the audit team to facilitate the faultlessness of the

substations/switchyards. It was requested that compliance of such recommendation be

reported to SRPC for compiling the same for records and reference.

6.2. Updating of Protection audit format

All SR constituents were requested to share suggestions/ modifications/ deletions

required in the protection audit format, vide SRPC mail dated 02.08.2019, so as to

update the same as per recent trends followed in the industry. Inputs have been

received from TSTRANSCO only. All constituents are requested to furnish the inputs

in this regard before 15.05.2020 for further discussion in the forthcoming PCSC

meeting.

7. Review of Islanding Scheme of Southern Region

A meeting to review Islanding Schemes in SR, taking into consideration the network

changes, was held on 27.01.2020 at SRPC, Bangalore and Record Notes of the same

was circulated vide SRPC mail dated 27.01.2020. As per the same SR constituents

were requested to furnish the following information:

i. Low and high frequency set points of all generators (including RE) in the

existing/proposed Islanding Schemes.

ii. Frequency at which generators are taken to house load operation.

iii. Stage wise mapping of df/dt and AUFR relays in PSSE case file.

iv. All network changes/updates.

v. Implemented islands, and details of lines crossing islanding schemes and

network changes within islands.

vi. New generation additions proposed up to 31.3.2021.

vii. Renewable Generators (i.e. Solar & Wind) set points w.r.t to Under Frequency

and Over Frequency tripping and their location in PSSE case file.

viii. Critical loads within islands and their location in PSSE case file.

Details in this regard has been received from KSEBL, TANTRANSCO, PED, and

TANGEDCO. The details are consolidated at Annexure – IV. Details of House load

operation details of generators were also sought vide SRPC mail dated 17th

March

2020. The information received in this regard is also available in Annexure –IV.

The utilities, which are yet to furnish the above information are requested to furnish

the same by 20th

May 2020.

8. SPS for 400 kV Nellore PS-Nellore D/C lines

SPS for 400kV Nellore PS – Nellore DC lines operated on 22.02.2020 at 12:07 hr. and

400kV Nellore PS-Nellore line II tripped. During antecedent condition, 400 kV Nellore

PS-Nellore lines were connected directly to 400 kV Thiruvalam through the Tie-breaker

at Nellore. It was intended to take LC on 400 kV Nellore-NPS line-2 on 22.02.2020.

While taking LC, main breaker of Nellore-Thiruvalam line-2 was closed at Nellore end.

Since 400 kV Nellore- NPS is a short line, there was sudden inrush of power immediately

Agenda for the 90th



after closing the main breaker. Due to this SPS at Nellore operated resulting in the

tripping of line 2 at Nellore end and DT was send to NPS end.

SPS Logic implemented is: Tripping current setting = 2580A with Time Delay 5 Sec.

The issue may be discussed is meeting

9. Status of Insulator replacement in the following lines of KPTCL

a. 400kV Hassan – Nelamangala

b. 400kV Nelamangala –Talaguppa.

As per information from KPTCL, during September - October 2019, the lines were kept

in non-auto mode due to insulator replacement works. However, auto reclose function in

the lines is still in disabled condition which is a matter of concern. Status of the work and

matter of enabling of auto reclosure in the lines may be discussed in the meeting.

10. Review of Distribution of Loads and Signal Paths of Raichur – Sholapur SPS,

Talcher – Kolar SPS, and Kudankulam (Unit-I & II) SPS

As per decisions in the 164th

OCC meeting SPS mock testing was required to de done on

27th

February 2020. However, subsequently TANTRANSCO, vide letter dated 21st

February 2020 requested to reschedule the mock test in view of pending works.

SRPC vide letter dated 24.02.2020 (Annexure-V) had taken up the matter regarding SPS

schemes implementation and mock testing was scheduled on 04.03.2020. However, the

scheduled mock test on 4th

March 2020 could not be carried out due to the pending

works. Moreover, certain discrepancies were also noted w.r.t DTPC port confirmation

matrix provided by PGCIL as compared with the deliberations in the 77th

PCSC meeting

and the wiring diagrams provided by states. The status of completion of works may be

deliberated in the meeting.

11. Review of Distribution of Tripping of Kudankulam Unit#1 - Non-extension of SPS

trip signal to Karnataka and Andhra Pradesh

SPS for tripping of Kudankulam U#1 had operated on 7th

February at 18:00 Hr. and on

30th

April at 12:35 Hrs. However, the trip signal was not received at Karnataka on both

the occasions. Trip signal was not received at Andhra Pradesh during SPS operation on

30th

April 2020 and hence there was no load relief. As confirmed by PGCIL the SPS trip

signal was generated at Kolar end. Non-receipt of trip signal at Karnataka and Andhra

Pradesh shall be discussed in meeting.

12. Status of Implementation of Line Differential Protection

The following updates were furnished during 89th

PCSC Meeting of SRPC held on 13-02-2020

at SRPC, Bangalore:

NTPC had informed that advance payment of Rs. 30 lakh had been released for retrofitting

of distance relays at Simhadri with Line differential relays.

PGCIL (SR-1) had intimated that work would be started soon and expected to be completed

by March 2020. They also requested NTPC to expedite release of remaining payment.

Status of LDP shall be discussed in the meeting.

PGCIL (SR-1) is requested to furnish regarding status of implementation of Line

Differential Protection at Simhadri complex.

-Status Update

Agenda for the 90th



13. Other Protection Issues, if any, with the permission of the Chair

14. Sending Agenda items for the PCSC meetings

As per the Guidelines of CEA/MOP, it has been decided to conduct the PCSC meetings on monthly basis. It is requested that Agenda Items for the PCSC meetings, if any, may please be sent latest by 5th working day of the month to SRPC Secretariat to compile and circulate the same so as to have fruitful discussions in the PCSC meetings.

15. Date of next PCSC meeting

The date of 91st meeting of PCSC will be decided in due course.

*****

Grid Occurrences to be discussed in the 90thMeeting of PCSC scheduled to be held on 27th May 2020 1/10

Grid Occurrences - 90

For all tripping events, Constituents are requested to kindly furnish the detailed analysis of the events along with SLD or equivalent pictorial representation clearly showing (i) Location of the fault, and (ii) Bus-bar arrangement/ Configuration of feeders and other connected equipment with proper CB positions (OPEN/ CLOSE) at the time of occurrence of the faultalong with records of Event loggers, Disturbance recorders. The constituents are also requested to submit presentation of the analysis which may be required to be presented by the constituents in the event of meeting being conducted through VC.

I. Details of Grid Disturbances:

Sl.

No.

Details of Event Date &Time Reason Remarks Category

1

Complete loss of

supply at 220kV

EDC, 220kV

NIMHANSand

220kV HAL

stations of KPTCL

29-01-2020

at 16:35 Hr.

Triggering incident was

lightning arrestor flashover in

220kV Hoody - HAL Line-1.

Subsequently 220kV Hoody -

HAL Line-2 tripped on

overloading. On tripping of

both source feeders there was

complete loss of supply at

220kV HAL, 220kV EDC and

220kV NIMHANS stations.

400 MW GD-1

2

Complete outage of

220kV EPIP and

ITPL stations of

KPTCL

20-02-2020

at 00:30Hr.

Triggering incident was

tripping of 220kV ITPL -

Hoody line on Y-phase cable

termination fault. Tripping of

incoming feeder resulted in


220kV EPIP and 220kV ITPL

stations.

Load Loss:

125 MW GD-1

3 Partial Blackout in

Karnataka and

North Kerala

01-03-2020

at 13:57 Hr.

400kV Mysore - Nelamangala

D/C was under planned

shutdown in the antecedent.

Triggering incident was BN

fault in 400kV Neelamangala

Hassan line. Since A/r was not

in auto mode due to insulator

replacement works, line tripped

on operation of Zone-1 distance

protection at both the ends.

Subsequently, 400kV

Talaguppa - Hassan line tripped

only at Talaguppa end on

operation of OC protection.

400kV Nelamangala -

Talaguppa tripped on Zone-1

distance protection at both the

ends due to RN fault. A/r was

not in auto mode due to

insulator replacement works.

This resulted in complete loss

Load Loss:

2380 MW

& Gen loss:

1754 MW

GD-1


of supply at 400kV stations viz.

UPCL, Talaguppa, Hassan,

Mysore, Kozhikode and 37 nos.

220kV stations in Karnataka

and 6 nos. 220kV stations in

Kerala.

4 Complete outage of

220kV Edappon

station of KSEB

03-03-2020

at 07:43 Hr.

Triggering incident was failure

of 220kV B-phase CT of Bus

coupler. This led to operation

of bus bar protection resulting

in tripping of all connected

elements.

Load Loss:

67 MW GD-1

5

Complete Outage of

230kV

Checkanurani SS of

TANTRANSCO

12-03-2020

at 01:20 Hr.

Triggering incident was failure

of Y phase CT of Bus Coupler

at 230kV Checkanurani SS.

Bus-1 and Bus-2 Busbar

Protection operated resulting in

the tripping of all connected

elements. However, ICT#3 was

not tripped. Since the failed CT

was near Bus-1 side, due to

non-tripping of ICT#3 which

was connected to Bus-2, there

was no fault feed after the

isolation of Bus-1.

Subsequently, ICT#3 was hand

tripped.

------ GD-1

6

Complete outage of

220kV Kolar,

220kV Malur,

220kV Sarjapur and

220kV VTP SS of

KPTCL

14-03-2020

at 16:30 Hr.

During antecedent conditions,

220kV Kolar KA, 220kV

Malur, 220kV Sarjapur and

220kV Vikas Tech Park (VTP)

are radially fed from 220kV

Kolar PG SS. Triggering

incident was tripping of 220kV

Kolar PG- Kolar KA line-1 at

Kolar KA end on pole

discrepancy during testing of

newly commissioned SPS

scheme. After the tripping of

220kV Kolar PG-Kolar KA-1,

220kV Kolar PG-Kolar KA-2

got over loaded and tripped at

Kolar PG end.This resulted in


220kV Kolar KA, 220kV



SS.

380 MW GD-1

6

Complete outage of

220kV Kolar,

220kVMalur,

220kV Sarjapur and

220kV VTP SS of

KPTCL

09-05-2020

at 22:41Hr

During antecedent conditions,

220kV Kolar(Kar), 220kV


220kV VikasTech Park (VTP)

SS are radially fed from 220kV

Kolar PG SS. Triggering

incident was YB fault in220kV

Kolar PG- Kolar(Kar) line-1.

Load Loss:

360 MW GD-1


After tripping of 220kV Kolar

PG-Kolar(Kar) line-1, 220kV

Kolar PG-Kolar(Kar) line-2 got

overloaded and tripped at

Kolar(Kar) end due to

operation of non-directional OC

protection. Due to tripping of

220kV Kolar(PG)-Kolar(Kar)

line-1 and 2, there was

complete loss of supply

at220kV Kolar(Kar), 220kV



SS.

Note: It may be noted that the

event is repeated for the third

time since January 2020. Also,

SPS is put in service on 07-02-

2020 in the 220kV Kolar (PG)–

Kolar(Kar) linesto avoid

cascaded tripping of the lines

bytripping 66kV loads at Malur

and Kolar SS. However, during

the above event the SPS did not

operate.

II. Details of Grid Incidents:

Sl.

No. Details of Event Date &Time Reason Category

1 Tripping of Bus-2 at

400kV Raichur

10-02-2020 at

03:31Hr.

Bus-2 at 400kV Raichur tripped on

operation of bus bar protection due

to heavy surface conduction at

switchyard. 400kV Raichur-

Mahbubnagar, 400kV Raichur -

BTPS and 400kV Raichur -

Munirabad lines tripped during the

event.

GI-2

2

Complete outage at

400kV side of

400/220kV Guttur

station of KPTCL

17-03-2020 at

20:00 Hr.

All elements at 400kV side of

400/220kV Guttur station tripped

on operation of LBB protection of

400kV Kaiga - Guttur line-2. As

reported P437 relay maloperated

which led to the operation of LBB

resulting in tripping of all

connected 400kV elements.

GI-2

3

Tripping of 220kV

Bus-2 at 220kV

Vizag switching

station (VSS) of

APTRANSCO

22-03-2020 at

15:45 Hr.

Triggering incident was failure of

B-phase Lightning Arrester on

220kV VSS - Kakinada line. This

resulted in operation of Bus bar

protection of bus-2 at 220kV VSS.

400/220kV, 315 MYA ICT-1 and

ICT-2 also tripped during the

incident.

GI-1


4

Multiple Tripping in

230kV Kadaperi SS

of TANTRANSCO

29-03-2020 at

04:04 Hr.


B ph CT of 230kV Alandur -

Kadaperi line and R ph CT of

230kV Sriperumpudur -Kadaperi

line-2 at 230kV Kadaperi end. This

resulted in bus fault at 230kV

Kadaperi SS and Bus bar

protection operated resulting in the

tripping of all the elements

connected at 230kV Kadaperi SS

since 230kV Kadaperi SS has

single bus configuration. There

was no interruption at 110kV level.

GI-1

5

Tripping of

400kV/230kV

NTPL ICT-1

12-01-2020 at

16:45 Hr.

As per the report submitted, ICT#1

at NTPL got tripped on operation

of SF6 Gas Pressure Low Trip.

GI-2

6

Tripping of 400KV

Vemagiri -

Sattenapally

14-01-2020 at

14:29 Hr.

Line tripped on operation of LBB

protection at Vemagiri end and DT

was received at Sattenapalli end.

There was no fault during the

event.

GI-2

7

Tripping of 400kV

Bus-2 at 400kV

Salem(PG) station

23-01-2020 at

11:13Hr.

Bus bar protection of 400kV Bus-2

maloperated at Salem (PG) station.

This resulted in tripping of 400kV

Hosur - Salem ckt-2.

GI-2

8 Multiple trippings at

400kV Sundilla

23-01-2020 at

22:10 Hr.

Triggering incident is R-N fault in

400kv Nirmal- Sundilla feeder.

Zone 1 pick up at Sundilla end and

A/R is not operated. Due to this

fault, there is a reverse zone 4

pickup observed in Singareni-

Sundilla 1,2 at Sundilla end.

Instantaneous zone 4 operation for

both circuits of 400kv Sundilla-

Singareni at Sundilla end needs

review.

GI-2

9

Tripping of 400/220

kV ICT-2 AT

Mysore

25-01-2020 at

03:23 Hr.

ICT#2 at Mysore got tripped on

mal-operation of PRD protection GI-2

10

Tripping of 400/220

kV ICT-4 AT

Gajwel

25-01-2020 at

05:13 Hr.

ICT#4 at Gajwel got tripped on

spurious operation of 86B and the

same needs review. There was no

fault during the event.

GI-2

11

Tripping of 400/

110kV Kamuthi

ICT 3 & 4

27-01-2020 at

14:44 Hr.

Triggering incident was fault in

110kV bus 2 due to melting of

incoming B Phase female isolator

of ICT 4 connected to Bus 2. Bus

bar operated in 110 KV Bus 2 and

this lead to tripping of ICT 3 and

ICT 4. It was reported and further

verified from SCADA Data that

there was 200MW loss of Solar

generation.

GI-1


12

Multiple Tripping in

220kV Vizag

Switching Station of

APTRANSCO

31-01-2020 at

14:14 Hr.

During tower erection works at

Loc 460-471, substation Earth wire

got pulled and fell on Bus 2

inadvertently at 220kV VSS. This

resulted in Bus fault and hence

220kV Bus-2 Bus Bar Protection

(BPP) operated resulting in the

tripping of all elements connected

to Bus-2 of 220kV VSS.

400/220kV ICT-2 at Gajuwaka

also got tripped during the event.

From PMU plots, delayed fault

clearance of 400ms was observed

and the same needs review.

GI-1

13

Tripping of

400/220kV ICT-4 at

Uravakonda

10-02-2020 at

10:14 Hr.

ICT#4 at Uravakonda got tripped

on suspected maloperation of PRV

protection and the same needs

review.

GI-2

14 Tripping of 400/220

kV ICT-2 at Gajwel

11-02-2020 at

07:13Hr.

ICT#2 at Gajwel got tripped on

maloperation of Buchholz relay

and the same needs review.

GI-2

15 Tripping of 400/220

kV ICT-2 at Trichur

13-02-2020 at

17:40 Hr.

LV side of ICT#2 at Trichur got

tripped during charging of

downstream 220kV/132kV

200MVA transformer and the same

needs review.

GI-2

16

Tripping of 400kV

Ramagundam -

Malkaram

07-03-2020 at

04:38 Hr.

Triggering incident was Y N fault

in the line. At Ramagundam end,

fault was sensed in Zone-1, A/r

operated and line tripped due to

persistent fault. As per the report

submitted at Malkaram end, it was

mentioned that line was in service;

the same needs review.

As per the report submitted by

Ramagundam it was mentioned

that, analog module of relay

maloperates intermittently and the

same needs review.

GI-2

17

Tripping of 400kV

Guttur –Hiriyur

Line-2

15-03-2020 at

18:03Hr.

Line tripped on operation of OV St-

1 protection operation at Hiriyur

end and was holding at Guttur end.

From DR of Hiriyur end, voltages

observed are: Vr-251kV, Vy-

248kV and Vb-248kV. Non

tripping of line at Guttur end needs

review.

GI-2

18

Tripping of

400/220kV

Julurpadu ICT-1

16-03-2020 at

10:40Hr.

ICT at Julurpadu got tripped on

operation of gas pressure lockout.

Non operation of Alarm needs

review.

GI-2

19

Tripping of 400kV

Dichipally – Nirmal

line-2

24-03-2020 at

13:11 Hr.

Line tripped on operation of OVR

stage-1 protection at Dichipally end

and DT received at Nirmal end.

From Dichipally end DR voltages

GI-2


recorded are Vr-254.8kV, Vy-

234.7kV & Vb-226.3 kV.

Difference of around 20kV in R

and Y phase voltages was observed.

20 Tripping of 220kV

Kochi Kalamaserry

line-2

29-Dec-2019

at 00:06:00 Hr.


PT of 110kV Kalamassery-

Carborandum line and CT failure

of 110kV Kalamassery-

Perumbavoor line at Kalamassery

s/s end. 220kV Kochi -

Kalamaserry line-2 tripped only at

Kochi end on Zone 4 reverse

operation. This needs review.

GI-1


Vallur – NCTPS

line-1

19-Mar-2020

at 12:05 Hr.

Shutdown for 400kV Vallur-

NCTPS line-1 was planned from

09 hr. -1700 hr. on 19.03.2020.

While closing NCTPS line 1 Earth

switch at NTECL end, heavy

voltage dip was experienced and

all the three running units of Vallur

tripped on Low Forward Power

Protection at 12:05 hr. Earth switch

of the line was closed at Vallur end

without opening of remote end

breaker, which resulted in three

phase to ground fault in 400kV

Vallur NCTPS line-1 at Vallur end. Gen Loss: 1893 MW

GI-2

III. Details of Trippings due to Failure or Non-operation of Auto-Reclose:

Sl.

No. Element Date & Time Reason

1 Tripping of 400kv

Kochi-Tirunelveli

13-01-2020 at

23:34 Hr.

Triggering incident is B phase to ground fault

in 400kv Kochi - Tirunelveli feeder. At both

the ends, Forward distance Zone 1 protection

operated.At Kochi end, A/R did not attempt,

the same needs review.AtTirunelveli end, A/r

operated and line tripped due to persistent fault.

2

Tripping of 400KV

Vemagiri (AP) -

Simhadri-II

14-01-2020 at

14:29 Hr.

Triggering incident was R-N fault in the line.

As per the report submitted at Vemagiri end, it

was mentioned that A/r operated and line

tripped due to persistent fault. But from DR, it

was observed that immediately after the

opening of R pole, Y and B pole also got

opened. As per the report submitted at

Simhadri end, it was mentioned that A/r not

operated due to receipt of DT from Vemagiri

end. Non operation of A/r and sending of DT at

Vemagiri end needs review.

3

Tripping of 400kV

Hinduja - KV Kota

Line-2

20-01-2020 at

01:35 Hr.

Triggering incident was RN fault in the line.

A/r not operated at KV Kota end due to carrier

fail. At Hinduja end, A/r operated and line

tripped due to persistent fault. Non operation of

A/r at KV Kota end needs review.


02-02-2020 at

11:36 Hr.

Triggering incident was BN fault in the line. At

Hinduja end auto reclose attempted and

successful but the line tripped on SOTF. At KV

Kota end, auto reclose did not operate and

tripped on Zone-2 distance protection.

4 Tripping of 400kV

Vemagiri_PG -

Vemagiri_AP line

14-02-2020 at

15:32 Hr.

Triggering incident was BN fault in the line. At

Vemagiri_AP end line tripped on Zone-1

distance protection. Auto reclose operated at

Vemagiri_AP end and locked out due to

persistent fault. At Vemagiri_PG end Zone-2

carrier aided trip observed from DR. Auto

reclose did not operate at Vemagiri_PG end,

the same needs review.

5 Tripping of 400kv

Kurnool- Srisailam

feeder.

15-02-2020 at

13:18 Hr.

Triggering incident was B N fault in the line.

Non operation of A/R at both the ends needs

review.

6 Tripping of 400kV

NNTPP- Pondy line-1 17-02-2020 at

13:38 Hr.

Triggering incident was B phase to Earth fault

in the line. Fault was sensed in Zone-1 at both

the ends. At Pondy end, A/r operated

successfully and line was holding. At NNTPP

end, A/r not operated.

7 Tripping of 400kV

Kurnool AP - Gooty

line

18-02-2020 at

17:08 Hr.

Triggering incident was Y N fault in the line.

At Gooty end, A/r operated successfully and

line was holding. At Kurnool AP end, Y pole

breaker opened after 100ms and subsequently

R and B pole breakers also opened after 300ms

(after opening of Y pole). Non operation of A/r

at Kurnool AP end needs review.

8 Tripping of 400kV

Narnoor -Srisailam

Left Bank

06-03-2020 at

18:00 Hr.


At Srisailam end, A/r not operated and line

tripped on operation of Zone-1 distance

protection. At Narnoor, from DR, opening of Y

phase pole was observed and from EL, P/d

operation was observed. Non operation of A/r

at both the ends review.

9 Tripping of 400kV

Khammam- Asupaka

line

16-03-2020 at

11:31Hr.

Triggering incident wasB N fault in the line. At

Khammam end, A/r operated successfully and

line was holding. At Asupaka end, line tripped

on operation of Zone-1 distance protection and

A/r not operated. Non operation of A/r at

Asupaka end needs review.

18-03-2020 at

13:11Hr.


At Khammam end, A/r operated successfully

and line was holding. At Asupaka end, line

tripped on operation of Zone-1 distance

protection and A/r not operated. Non operation

of A/r at Asupaka end needs review.

10 Tipping of 400 kV

Guttur - Hiriyur - 2 17-03-2020 at

13:06Hr.


At Hiriyur end, A/r operation was successful

and line was holding. At Guttur end, A/r not

operated.


Udumalpet – Idukki

Line-2

18-03-2020 at

06:52Hr.

Triggering incident was fault in Y phase of

220kv Udumalpet-Idukki feeder. A/R operated

at Idukki end and A/R did not operate at

Udumalpet end; the same needs review.



Udumalpet - Idukki

line-1

23-03-2020 at

07:37Hr.


At Udumalpet end, fault was sensed in Zone-1,

A/r operated and line tripped due to persistent

fault. At Idukki end, Zone-2 distance protection

operated. Failure of carrier aided protection

and non-operation of A/r at Idukki end need

review.


Raichur- Munirabad

line

28-03-2020 at

07:11 Hr.

Triggering incident was R N fault in the line.

A/r operated at both the ends and line tripped

due to occurrence of subsequent fault during

A/r reclaim time. As per the report submitted, it

was mentioned that tie didnot attempt A/r at

Raichur end and the same needs review.


Theni-Mooziyar

06-11-2019 at

11:11:00 Hr.

Triggering incident was B-phase to Earth fault

in the line. At Theni end, fault was sensed in

Zone-1, A/r operated and line tripped due to

persistent fault. At Sabarigiri end, A/r not

operated. Non operation of A/r at Sabarigiri

end needs review.

15

Tripping of 400kV

Hinduja KV Kota

line-1

06-11-2019 at

11:33:00 Hr.

Triggering incident was R phase to Earth fault

in the line. Fault was sensed in Zone-1 at both

the ends. A/r operated successfully at HNPCL

end and line was holding. At KV Kota end, A/r

not operated and the same needs review.

16 Tripping of 220 kV

Kayamkulam-

Punnapura line-2

24-12-2019 at

05:25:00 Hr.

Triggering incident was B phase to Earth fault

in the line. At Kayamkulam end, fault was

sensed in Zone-1, B-pole opened but didn't

reclose. At Punnapura end, Zone-2 carrier

aided protection operated and A/r operation

was successful. Non operation of A/r at

Kayamkulam end needs review.


Udumalpet-Idukki

line-1

03-01-2020 at

06:30:00 Hr.


At Udumalpet end, fault was sensed in Zone-1,

A/r operated and line tripped due to persistent

fault. At Idukki end, Zone-2 distance protection

operated. Failure of carrier aided protection

and non-operation of A/r at Idukki end need

review.

IV. Details of Trippings due to PLCC mal-operation:

Sl.No Element Date &

Time

Reason

1 Tripping of 400kV Guttur –

NarendraLine-2 16-01-2020

at 11:03 Hr. Line tripped only at Guttur end on DT Receipt due to

suspected maloperation of PLCC.

2

Tripping of 400 kV Kolar -

Hoody 1

17-02-2020

at 23:59 Hr.

Line tripped on operation of OV St-1 protection at

Kolar end and DT was sent to Hoody end. But line

didnot trip at Hoody end. Non-tripping of line at Hoody end on DT received

needs review.

3 Tripping of 400kV Neyveli 2

(Exp) - Pugalur line 30-03-2020

at 15:10Hr.

Triggering incident was Y-phase to ground fault in the

line. Line tripped on Zone-1 distance protection.Auto

reclose attempted but locked out due to persistent

fault. At Pugalur end, DT was received resulting in

3phase trip. DT sent from Neyveli end needs review.


V. Frequent tripping of 220kV KTPS-Lower Sileru line-1 and 220kV KTPS V- Lower

Sileru line-2 during February 2020 to April 2020.

S.NO. ELEMENT NAME TRIPPING

DATE

TRIPPING

TIME REMARKS

1 220kV KTPS V- Lower Sileru-2 16-Feb-20 11:54 BN fault



4 220kV KTPS V- Lower Sileru-2 08-Feb-20 12:35 SLG fault

5 220kV KTPS - Lower Sileru-1 29-Mar-20 12:22 BN fault

6 220kV KTPS V- Lower Sileru-2 27-Mar-20 12:05 RN fault

7 220kV KTPS V- Lower Sileru-2 22-Mar-20 11:16 BN fault



10 220kV KTPS - Lower Sileru-1 15-Mar-20 12:04 RN fault

11 220kV KTPS V- Lower Sileru-2 11-Mar-20 14:05 BN fault

12 220kV KTPS - Lower Sileru-1 07-Mar-20 13:25 SLG fault

13 220kV KTPS V- Lower Sileru-2 05-Mar-20 12:00 SLG fault

14 220kV KTPS - Lower Sileru-1 29-Apr-20 12:43 BN fault

15 220kV KTPS V- Lower Sileru-2 27-Apr-20 12:38 3 phase fault

16 220kV KTPS V- Lower Sileru-2 25-Apr-20 16:55 RB fault

17 220kV KTPS - Lower Sileru-1 12-Apr-20 15:23 RN fault

18 220kV KTPS V- Lower Sileru-2 11-Apr-20 12:19 SLG fault

19 220kV KTPS - Lower Sileru-1 02-Apr-20 12:17 BN fault

VI. Frequent tripping of 220kV KTPS Nunna line during Feb 2020 to April 2020.

S.NO. ELEMENT NAME TRIPPING

DATE

TRIPPING

TIME REMARKS

1 220kV KTPS-NUNNA 05-Mar-20 13:44 BN fault

2 220kV KTPS-NUNNA 25-Apr-20 17:20 BN fault

3 220kV KTPS-NUNNA 25-Apr-20 12:05 RN fault

4 220kV KTPS-NUNNA 23-Apr-20 13:37 BN fault





9 220kV KTPS-NUNNA 06-Apr-20 13:39 SLG fault

VII. HVDC Pole Trippings

Sl.No ELEMENT NAME TRIPPING

DATE/ TIME

REVIVAL

DATE/ TIME RMEARKS

1 HVDC 500KV BHADRAVATHI Pole 2

27-01-2020/09:34 27-01-2020/14:40

THYRISTOR FAILURE

2 HVDC 500KV KOLAR_DC Pole 2 17-02-2020/23:59

17-02-2020/00:36

DUE TO HVDC LINE FAULT

3 HVDC 500KV KOLAR_DC Pole 2 17-02-2020/17:38

17-02-2020/18:33

DUE TO HVDC LINE FAULT

4 HVDC 500KV GAZUWAKA Pole 1 03-03-2020/11:39

03-03-2020/17:09

Thyristor redundancy failure



04-03-2020/04:01

Thyristor side problem


18-03-2020/11:48 18-03-2020/12:37

Failure of PLC 4901 processors


18-03-2020/11:48 18-03-2020/12:37



18-03-2020/11:48 18-03-2020/12:46



21-03-2020/14:25

AUXILIARY POWER FAILURE

VIII. Gazuwaka Oscillations

2X 500 MW HVDC Gazuwaka Back to Back is an important inter-regional link for transfer of

power between Southern and Eastern Regions. During January and February 2020, fluctuations

in AC side voltage have been observed at Gazuwaka. A total of 24 number of incidents were

observed from PMU signals (list given below). These fluctuations continued for a significant

duration of time and occurred repeatedly on some days. Such fluctuations in power system

parameters is a serious issue and is a threat to reliable power system operation.

List of incidents involving fluctuations in AC side voltage at HVDC Gazuwaka station is as

below:

***

Meeting

No /

Index

Details of Event Date & Time Reason PCSC Recommendations Utility responsible for Implementation Status of Implementation of PCSC Recommendations Remarks Latest Status

(To be filled up by the Constituent)

Status of Pending Implementation of PCSC Recommendations as on 08.05.2020 (up to 90th Meeting)

KPTCL Mail dated 27-05-2015:

1. KPTCL has taken action to provide bus bar protection to 220kV buses. ---

Pending

2. Over current relay Settings of ICTs to be reviewed by PGCIL.

--- Pending

3. --- Pending

KPTCL Mail dated 29-07-2015:

1. Initial Tendering stage. --- Pending

2. --- Pending

3. --- Pending

KPTCL Mail dated on 23-01-2016:

1. Detailed estimate prepared for taking up the work. CEE, Transmission Zone,

Gulbarga will take up necessary procurement and further execution. --- Pending

2. --- Pending with PGCIL (SR-I).

3. --- Pending

PGCIL (SR-I) Mail dated 14.07.2016:

2. Relay settings of all the stations in SRTS-1 were derived as per Ramakrishna

Commettee recomendations and implemented" --- Completed.

KPTCL Mail dated 16.12.2017:

1) & 3). DPR is approved. Tender is to be called by CEE,TZ Kalaburgi ---

Pending

Review Meeting dated 19.12.2017:

1. KPTCL informed that Tenders for providing BBP would be called in Jan-Feb,

2018; Supply of the same is targeted by September, 2018; Erection &

Commissioning is targeted by January, 2019

--- Pending

3. PGCIL (SR-I) informed that time-synchronization of 220 kV side is in place. ---

Completed.

KPTCL mail dated 19.12.2018:

1. DPR preapared for the work of providing Bus Bar Protection to 220kV buses

at Guddadahally is approved. Tender is to be invited by CEE,TZ .


1. Tender would be floated in January 2019. Works would be completed in 6

months after awarding PO.


1. KPTCL informed that the work is expected to be completed by December

2019.

16-07-201434/I/6 400/220 kV ICT-1 & 2 at

Munirabad

As reported directional over current relay of ICT’s

operated due to snapping of line jumper in

220kV Lingapur line.

1. Bus bar protection shall be provided by asset owner ( i.e KPTCL).

2. Settings for main distance protection & Overcurrent protection shall be

examined and reviewed.

3. Time synchronization of the Substation shall be ensured.

KPTCL/

PGCIL (SR-I)

Pending

(with KPTCL)

Multi-Utilities

Annexure-II

Page 1 of 39

NTPC mail dated 07.12.2017:

1. High set DEFR on 220 KV lines is disabled ----Completed

2. ---- Pending


TSTRANSCO informed that the works are under progress, and are targeted to be

completed in 3 months time.

TSTRANSCO MAIL DATED 20.01.2018:

Line Differential Protection will be provided within 3 months i.e., by end of

March, 2018.


Line Differential Protection relays are under procurement and will be provided by

end of May, 2018.


Line Differential relays will be supplied to site by manufacturer by end of May,

2018 and erection will be completed by end of June, 2018.


Inspection of the relays is completed and the relays are received at stores. Relays TSTRANSCO MAIL DATED 22.01.2019:

Relays will be commissioned by end of February, 2019.

TSTRANSCO mail dated 22.06.2019:

2. Relay erection work is under progress and will be completed by end of July,

2019.


LDP relays are available but commissioned was not done bue to non availability

of carrier communication cable and will be done in 2 months i.e., by December,

2019.


LDP relays are available at site. carrier communication cable laying between the

LDPs is procured and laying work is under progress and will be completed by end

of January,2020.

Commissioning of LDPs will be done by 2nd week of February, 2020.

11-06-2017

at 19:46hrs

NTPC-Ramagundam/ TSTRANSCO PendingTriggering incident was failure of 220 kV

B-phase LA in ICT-3 LV extension feeder (220KV

line-2) at Malayalapalli substation

1. NTPC to disable high-set of DEFR on the 220 kV lines emanating from their

Ramagundam STPS.

2. NTPC/ TSTRANSCO to provide Line Differential Protection (with or without

pilot) on 220 kV Ramagundam – Malayalapalli lines – 1 & 2 & 3.

66/ II/

10

Tripping of 400/ 220 kV

ICT’s – 3 & 4 at

Ramagundam STPS

Annexure-II

Page 2 of 39


PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL

to complete procurement of LDP relays. To this, PCSC forum asked TPCIL to

submit written confirmation to PGCIL (SR-I) by 29.12.2017. PGCIL (SR-I)

assured that with receipt of above confirmation from TPCIL by Dec, 2017, they

would be able to complete the work by February, 2018.

APTRANSCO informed that they would be able to implement LDP from their &

APGENCO side by April, 2018.

In this regard, PCSC forum made it clear that the recommendation is about

providing LDP as both Main-I & Main-II relays on all stated lines in Nellore

Complex, ans asked all stakeholders to ensure & comply with the same.

PGCIL (SR-I) mail dated 20.06.2018:

2. PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays.

Tenders are invited from bidders & tender floated. Technical bid opening in this

week.


2. PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be

completed by Jan'2019 and commissioning by Mar'19.

Review Meeting on 20.12.2018 & 27.06.2019:PGCIL (Sr-1) mail dated 31.10.2019:

Retrofitting works completed in NPS-NCC-1&2, NPS-Nellore-1&2 Main-1 relay,

NPS-TPCIL-1&2 lines completed.

Confirmation for retrofitting of Main-2 relay in NPS-Nellore-1&2 lines to be

received from SRPC. Presently both lines are bypassed at Nellore Bus-1&2 and

connected to Tiruvalam SS by closing Tie CBs at Nellore end. Now lines are long

lines as 400kV NPS-Tiruvalam-1&2. The same was discussed in 84th PCSC

meeting. SRPC has to give concurrence.

PGCIL -SR-1 maild ated 17.12.2019:

Retrofitting works completed in NPS-NCC-1&2, NPS-TPCIL-1&2 lines for both

Main-1&2 relays. Issue to be closed

APTRANSCO maild ated 30.01.2018:

1. Pending...

2.A/R scheme on 400kV Kurnool (PGCIL) feeder-2 will be checked after getting

LC.

APTRANSCO maild ated 24.04.2018 & 24.05.2018 & 26.06.2018:

1. Pending...

APTRANSCO Mail Dated 18.12.2018:

1) Bays and lines pertains to PGCIL .

2) ---Completed.


1) PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be

completed by Jan'2019.

APTRANSCO MAIL DATED 22.01.2019:

Pending [with PGCIL (SR-I)]


PGCIL(SR-1):

This issue of retrofitiing of distance relays with LDP relays in Kurnool(PG) –

Kurnool(AP) D/C lines has been discussed with our management. Our

management is seeking approval for the same. You are requested to takeup this

LDP issue in next TCC meeting.




management is seeking approval for the same. You are requested to takeup this

LDP issue in next TCC meeting.

PGCIL -Sr-1 mail dated 17.12.2019:



management is seeking approval for the same.

SRPC/PCSC may please allow the POWERGRID to book the expenditure in any

ongoing/upcoming projects.

PCSC on 18.12.2019:

PCSC forum decided to forward the issue to SRPC TCC meeting

TPCIL/

PGCIL (SR-I)

1. TPCIL to configure DEF protection such that it remains in blocked condition

as long as Distance Protection is active, and becomes active only when distance

protection does not pickup.

2.PGCIL (SR-I) to ensure healthiness of Carrier communication, and the set PUP

mode of carrier aided scheme operates reliably on TPCIL lines 1 & 2.

400kV TPCIL - Nellore line-1 got tripped at TPCIL

end during failure of LA of Station Transformer-2 at

TPCIL. Running Units at TPCIL got tripped due to

loss of evacuating line. 400kV TPCIL - Nellore PS

line-2 was under emergency shutdown

30-10-2017 at

21:37 hrs

Pending [With

TPCIL]

Pending [with

PGCIL (SR-I)]

APTRANSCO/

PGCIL (SR-I)

1) PGCIL (SR-I) and APTRANSCO to provide for Line Differential Protection

as both the Main protections on 400 kV Kurnool (AP) – Kurnool (PG) lines 1 &

2 lines.

2) APTRANSCO to furnish an action taken report w.r.t. resolving A/R non-

operation at Kurnool-AP end for the subject trippings and configure EL for

capturing PDR operation at their 400 kV Kurnool-AP SS.

Complete outage of 400kV

TPCIL station

69/I/2

02-10-2017 at

02:03 hrs

Tripping of 400 kV

Kurnool(PG) –

Kurnool(AP) line-2

69/III/3 Line tripped on B-ph to ground fault. A/R was

unsuccessful at both Kurnool (AP) and Kurnool

(PG) ends.

Annexure-II

Page 3 of 39

APTRANSCO maild ated 15.12.2017:

APTRANSCO would extend support and requirements if any ,for the

rectification proposed by KPTCL.


It was noted that the original Gooty - Lingapur line got LILOed at BTPS, Alipura,

and Ragulapadu. It was also noted that Phase Discrepancy is being observed in

Ragulapadu - Alipira section only. When enquired about the same, KPTCL

informed that they would examine the issue in detail, and would inform the

action lan proposed by next PCSC-71 meeting. On this, APTRANSCO was also

asked to render all help required from their side to KPTCL.

APTRANSCO maild dated 30.01.2018:

APTransco world extend required support .

APTRANSCO maild dated 24.04.2018 & 24.05.2018 & 26.06.2018:

AP Transco would extend required support for attending, phase discrepancy issue

in ragulapadu-Alipura line by KPTCL.


To be attended by KPTCL as discussed in 75th PCSC meeting.


Phase mis match issue is to be sorted out jointly by KPTCL/ APTRANSCO/

KPCL.

Review Meeting on 20.12.2018:

PCSC forum decided that concrete action in this respect to be initiated in 2

months by KPTCL alongwith APTRANSCO.


Pending [with KPTCL ]


KPTCL informed that the work is expected to be completed by August 2019.


Correction is to be incorporated in the primary side, procurement of required

materials under progress.


3). Nagzari-Bidnal PLCC link is healthy --- Completed.

1.--- Pending

2. --- Pending


1. & 3. Completed

2. Pending

KPCL mail dated 24-12-2018:

1) --- Completed

2) Proposal will be taken up for replacement of existing PZ1000 relays with new

version Numerical Line protection relays having IEC61850 shortly, after availing

necessary admnistrative approval...Pending

3) Completed

KPCL mail dated 23.01.2019:

1. Completed

2. Letter addressed to site to take up the proposal for replacement of PZ1000 line

distance relays.

APTRANSCO/ KPTCL

Tripping of 230 kV

Thiruvalam - Chittoor line

1) TANTRANSCO Mail dated 29.08.2018 & 11.09.2018:

Material supplied and work to be taken up ---Pending

2) APTRANSCO Mail dated 24.09.2018:

The static relays were replaced with Numerical relay on all 220 kV feeders at 220

kV SS chittoor.---Completed

TANTRANSCO Mail dated 11.12.2018:

Due to space constraint, the equipments could not be erected.


In view of Tiruvalam being inter-state sustation, TANTRANSCO was asked to

prvodie double-bus operation at their 230 kV Tiruvalam SS.


Pending [with TANTRANSCO]

TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:

Feasibility for providing hybrid breaker / shifting of bays will be studied & action

will be taken. Time upto Sep 2019

TANTRANSCO MAIL DATED 13.06.2019:

1. Bus segregation will be ensured by providing bus coupler bay by extending the

existing Bus.Time line 31.12.2019.

TANTRANSCO mail dated 18.07.2019 & 26.07.2019:



TANTRANSCO mail dated 12.02.2020:


existing Bus.Time line rquested upto 31.12.2020.

Pending [with

TANTRANSCO]

Tripping of 220 kV

Ragulapadu – Alipura line

12-10-2017 at

01:30 hrs

1) TANTRANSCO to provide double-bus operation at their 230 kV Thiruvalam

SS.

2) APTRANSCO to replace the existing static relays with suitable numerical

relays for various line protections at their 220 kV Chittoor SS.

Pending

[with KPTCL ]

Y-phase to earth fault occurred in line. At 230 kV

Tiruvalam end, breaker was under lockout leading

to operation of LBB protection.

KPTCL and APTRANSCO to sort out issues relating to incongruence in

denoting R, Y, B phases of the electric supply on their respective sides.

TANTRANSCO/ APTRANSCO13-06-2018 at

18:55hrs

Line tripped on B-Ph to earth fault. A/R was

successful at Regulapadu and breakers at Alipura

end got tripped.

69/III/7

76/II/9

1. SLDC/KPTCL to be pro-active in issuing necessary directions that help in

expeditious restoration of the tripped lines based on the prevailing conditions

and grid security.

2.KPCL to implement A/R enabled on all 220 kV lines emanating from their

220 kV Nagjheri PH, with the help of KPTCL, by December, 2018. In the event

of non-amenability of the existing PZ1000 relays in providing A/R feature,

KPCL shall take steps to retrofit them with suitable relays that support A/R.

3. KPTCL to restore PLCC carrier communication on 220 kV Nagjheri – Bidnal

line at the earliest

220kV lines connected to Nagjheri PH got tripped

due to successive transient faults. Running Units #3

and #4 at Nagjheri got tripped on over frequency

protection operation due to loss of evacuating lines

resulting in complete outage of 220 kV Nagjheri.

220 kV Nagjheri being the only source to 220kV

Ambewadi station, since 220kV Ambewadi

Narendra line 1&2 were under shutdown during

antecedent condition, tripping of Units at 220 kV

Nagjheri resulted in the loss of supply to 220 kV

Ambewadi SS.

17-09-2018 at

14:37hrs

Complete outage of 220 kV

Nagjheri PH and 220/110

kV Ambewadi Substation.

78/I/2 KPCL/ KPTCL Pending

Annexure-II

Page 4 of 39


1). COMPLETED


version Numerical Line protection relays having IEC61850. Prepration of

specification is under progress.

3) COMPLETED


1) & 3) Completed

2) Budgetary offer obtained for replacement of existing PZ1000 relays with new

version Numerical Line protection relays having IEC61850. Preparation of

estimation and specification is under progress.


1) & 3) Completed

2) Replacement of existing PZ1000 relays with new version Numerical Line

protection relays having IEC61850 is included in PSDF Phase-II DPR. Approval

of NLDC for DPR is awaited. Further, availing administrative approval for issue

of NIT for replacement of existing PZ1000 relays with new version Numerical

Line protection relays having IEC61850 and preparation of estimation and


Review Meeting on 27.06.2019:KPCL mail dated 16.07.2019:

1) & 3) Completed



of NLDC for DPR is awaited. However, administrative approval for issue of NIT

for replacement of existing PZ1000 relays with new version Numerical Line

protection relays having IEC61850 obtained. Preparation of technical



2)Replacement of existing PZ1000 relays with new version Numerical Line


of NLDC for DPR is awaited. NIT issued through e-portal on 16.09.2019. Pre-

bid meeting was held on 10.10.2019. Finalising of replies to pre-bid queries is in

progress.




of NLDC for DPR is awaited. NIT issued through e-portal on 16.09.2019. Cover-

1 opened on 02.12.2019. Technical evaluation is in progress.




of NLDC for DPR is awaited. NIT issued through e-portal on 16.09.2019. Tender

evaluation is in progress.


1. KPTCL I formed that SPS scheme finalisation shall be completed in one month

time --- Pending

KPCL mail dated 24-12-2018:

2) Time delay of operation is not changed. However, the external NCT is used for

REF protection against earlier internal NCT for REF, to avoid tripping due to

malopration --- Completed.


1) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.

2)....Completed.


1) It shall be reviewd and Implemented by KPTCL in coordination with KPCL.

KPCL mail dated 10.05.2019 & 25.06.2019 & 30.10.2019:

1) Letter addressed to KPTCL RT dated: 25.03.2019 for review and

implementation of SPS at NPH. Reply is awaited.


1. KPTCL informed that Nagjheri SPS has to be studied in the event of

configuration changes and outcome of the same will be intimated soon .KPCL mail dated 16.07.2019 and 17.12.2019 and 11.02.2020:


implementation of SPS at NPH. Reply from KPTCL is awaited.

2)Completed.


The logic is being reviewed by SRLDC by conducting system studies for the

changed network configuration

31-08-2018

at 11:49 hrs

1)KPTCL to examine the reasons for tripping of more than one Unit (Units – 3

& 6) on SPS operation at Nagjheri PH during subject trippings, and furnish a

report on the same along with remedial action taken to PCSC forum.

2)KPCL to employ a suitable time delay of 50 – 60 msec in operation of REF

protection for the GT of Unit-2 at their Nagjheri PH.

78/II/16 Multiple trippings at

220kV Nagjheri PH

Triggering incident was B-E fault in 220 kV

Nagjheri - Ambewadi line-1. As per the information

received, after tripping of 220 kV Naghjeri -

Ambewadi line-1, 220 kV Naghjeri Ambewadi

line#2 got overloaded. This resulted in the tripping

of Nagjheri Generating Units #3 and 6 on SPS

operation. At the same time, Unit #2 got tripped on

REF operation.

1. SLDC/KPTCL to be pro-active in issuing necessary directions that help in

expeditious restoration of the tripped lines based on the prevailing conditions

and grid security.

2.KPCL to implement A/R enabled on all 220 kV lines emanating from their

220 kV Nagjheri PH, with the help of KPTCL, by December, 2018. In the event

of non-amenability of the existing PZ1000 relays in providing A/R feature,

KPCL shall take steps to retrofit them with suitable relays that support A/R.

3. KPTCL to restore PLCC carrier communication on 220 kV Nagjheri – Bidnal

line at the earliest

220kV lines connected to Nagjheri PH got tripped

due to successive transient faults. Running Units #3

and #4 at Nagjheri got tripped on over frequency

protection operation due to loss of evacuating lines

resulting in complete outage of 220 kV Nagjheri.

220 kV Nagjheri being the only source to 220kV

Ambewadi station, since 220kV Ambewadi

Narendra line 1&2 were under shutdown during

antecedent condition, tripping of Units at 220 kV

Nagjheri resulted in the loss of supply to 220 kV

Ambewadi SS.

17-09-2018 at

14:37hrs


Nagjheri PH and 220/110

kV Ambewadi Substation.

78/I/2

KPTCL/ KPCL Pending

KPCL/ KPTCL Pending

Annexure-II

Page 5 of 39

TANTRANSCO Mail dated 11.12.2018:

1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator

status feedback. Work under progress. ......Pending

2.Earth value of 110kV earthmat has been improved & 230kV side earthmat

work under progress. Lightning mask earthing renovation under

execution............Pending

3.......Pending


Relays settings reviewed and need to be revised due to change of line length DR

& EL's of Main-1 (P444) relay configured properly. Main-2 (D60) relay to be

configured.


1 & 2). TANTRANSCO informed that Work will be completed by March 2019.

3. APTRANSCO informed that work will be completed by February 2019.


Collecting the details of adjacent feeders connected to Gummadipudi for

computing revised relay settings.

TANTRANSCO MAIL DATED 23.01.2019:APTRANSCO mail dated 15.03.2019:

3. Revised relay settings were implemented on 16/02/2019 ---Completed


New 230kV isolators have been allotted for replacement of defective isolators.

Hence time line requested upto June.2019.


1. New 230kV isolators have been allotted for replacement of defective isolators.

Hence time line requested upto Sep.2019.


1. New 230kV isolators have been allotted for replacement of defective isolators.

Hence time line requested upto Sep.2019.

2. & 3. Completed

TANTRANSCO mail dated 18.07.2019 & 26.07.2019:

1. 1New 230kV isolators have been allotted for replacement of defective

isolators. Hence time line requested upto Sep.2019



Hence time line requested upto March 2020.

81/IV/3 Tripping of 400 kV

Warangal - Bhoopalapalli

line-2

15-12-2018 at

20:42 hrs

Line tripped at Bhoopalapalli end only and was

holding from warangal s/s. FIR, DR and EL of

Bhoopalapally were not furnished.

For the line under consideration, the following shall be carried out by

TSGENCO in coordination with PGCIL (SR-I):

(i) End-to-end communication for DT/ permissive & other signals may be

ensured by testing at both the ends.

(ii) Healthiness of PLCC system components (hardware and software) at both

ends shall be checked and faulty components shall be repaired/ replaced.

TSGENCO/ PGCIL (SR-I) PGCIL (SR-I) mail dated 07.06.2019:

PGCIL-SR1: Presently WGL-Bhopalapalli-2 line PLCC Ch-1 is unhealthy same

was informed to TSGENCO for rectification. The Ch-1 is out of service from last

50 days onwards. Both ends PLCC belongs to TSGENCO

TSGENCO mail dated 24.06.2019:

TSGENCO is cordinating with TSTRANSCO for testing of End-to-End

communication for DT/permissive & other signals; checking of Healthiness of

PLCC system components and also for replacing of faulty components .


TSGENCO informed that PLCC has to be replaced and will be done by December

2019.


PLCC panels of Warangal Bhoopalpalli line-2 are replaced with new CGL make

panels from 05.11.2019 to 07.11.2019. Hence requested to drop the point

Complied

83/I/1 Complete outage of 230kV

Veeranam substation of

TANTRANSCO

11-03-2019

at 00:55Hrs

Triggering incident was Y-phase CT blast in 230kV

Tirunelvelli (Abhishekpatty) – Veeranam Ckt-1.

230kV Trirunelvelli – Veeranam Ckt-1 and 2

tripped. Two faults were observed from the PMU

plot. During the second fault, delayed fault

clearance of 400ms was observed. As reported, other

connected feeders 230kV Veeranam – Kodikur ckt-

1&2 and 230kV Veeranam – Kayathar tripped on

Zone -2 protection.

1. TANTRANSCO is recommended to submit action plan to provide Multi-Bus

operation/ Hybrid breakers at 230kV Veeranam SS with clear timelines.

2. TANTRANSCO to revise the distance zone settings at Tiruneveli SS for

230kV Veeranam – Tirunelveli line to overcome the problem of relay overreach

and share the same with SRPC.

3. TANTRANSCO to take definite measures ensure the time synchronization of

relays at Tirunelveli end.

4. TANTRANSCO to submit equipment failure report of the failed CT to CEA.

TANTRANSCO TANTRANSCO MAIL DATED 13.06.2019:

1.Provision of bus coupler breaker is not feasible due to space constaint.

2&3. Tirunelveli end maintained by PGCIL.

4. Report will be sent.

Review meeting on 27.06.2019:


2. Will be informed

3. Time synchronisation will be ensured.

4. Report will be sent.

TANTRANSCO mail dated 19.07.2019 and 12.02.2020:


2&3. Tirunelveli end maintained by PGCIL.

4. Report sent to CEA. -- Completed

Pending[PGCIL-

SR-II]

Triggering incident was B-phase fault at 230kV

Gummidipoondi Substation due to which 230kV

Bus-1 Bus-bar protection operated. 230kV

Gummidipoondi Station was under single bus

operation, hence operation of Bus-bar protection

resulted in tripping of all connected elements.

05-10-2018 at

00:42 hrs

Complete outage of 230/

110 kV Gummidipoondi

Substation

79/I/2 TANTRANSCO/ APTRANSCO1) TANTRANSCO to take steps to implement multi-bus, multi-zone operation

(Double-bus operation) at their 230 kV Gummidipooindi SS by December,

22018.

2) TANTRANSCO to check if the Gummidipoondi substation is adequately

protected from lightning-strokes by providing requisite no. of lightning masts

and/ or earth-wire caging.

3) APTRANSCO was asked to verify & correct the settings employed for

distance protection at Sullurpeta and configure DR’s & EL’s of all Protection

Relays at their Supllurpet SS properly for recording only the mandated

protections & digital signals.

Pending [with

TANTRANSCO]

Annexure-II

Page 6 of 39


Hubli substation of KPTCL

and 220kV

Nagjheri Power station of

KPCL

10-04-2019

at 18:09Hrs

Y and B-phase earth isolator switch blades of

220kV Hubli-Bidnal ckt-1, got closed due to failure

of locking mechanism during heavy wind and rain

conditionsresulting in bus fault. Bus bar protection

operated and all connected elements tripped. There

was

complete loss of supply at 220kV Hubli station since

the station was on single bus operation. At thesame

time, 220kV Nagjheri-Ambewadi ckt-1 and 220kV

Nagjheri – Bidnal tripped on overcurrent

protection. Since 220kV Nagjheri – Ambewadi ckt-2

and 220kV Nagjheri-Kodasalli ckt-1 &2 wereunder

shutdown in the antecedent due to maintenance,

running units #1,4,5 and 6 tripped due to

loss of evacuating lines. This resulted in complete

loss of supply at 220kv Nagjheri station.

1. KPTCL is recommended to revise the SPS at Nagjheri, (to accommodate a

new condition with high flow and low time delay) in consultation with SRPC

and SRLDC.

2. KPCL in coordination with KPTCL is recommended to provide at least one

main protection as carrier aided three zone distance protection on the 220kV

lines emanating from Nagjheri GS.

KPTCL/ KPCL KPCL mail dated 25.06.2019:

2) Carrier aided protection is enabled on all 220kV lines emanating from NPH

___Completed


1. KPTCL informed that Nagjheri SPS has to be studied in the event of

configuration changes and outcome of the same will be intimated soon

KPCL mail dated 16.07.2019 & 30.10.2019:

1. under progress

2. Completed

KPCL mail dated 17.12.2019 and 11.02.2020:

1) To be furnished by KPTCL

2)Completed.




Pending

83/II/9 Tripping of 400 kV

GUTTUR - NARENDRA -

1

10-03-2019 at

18:03hrs

Line tripped on operation of overvoltage stage-1

protection at Guttur end and DT received at

Narendra end. Voltages at Guttur end: Vr-254kV,

Vy-252kV, Vb-246kV. As per voltage grading,

400kV Guttur Narendra line-2 should trip first.

PGCIL (SR-II) to submit action plan regarding replacement of CT’s for 400Kv

Guttur Narendra line -1 at Guttur end. PGCIL (SR-II) to sort out the time sync

issues in DR and EL at Narendra end.

PGCIL (SR-II)/ KPTCL PGCIL (SR-I) mail dated 07.06.2019:

Line belongs to PGCIL(SR-2)


PGCIL(SR-II) informed that R & Y ph CVT replaced on 25.05.2019. Time

syncronisation has to be attended by KPTCL.

Pending


NCTPS Generating Station

of TANGEDCO

18-05-2019 at

04:39 hr.

Triggering incident was Y phase to Earth fault in

220 kV NCTPS Tondiarpet line-2. Due to mal-

operation of LBB protection (of Tondiarpet line-2)

at NCTPS end, all the connected elements of bus

zone-3 got tripped. Due to loss of evacuating lines,

running units at NCTPS unit#1 and 2 got tripped.

1.TANTRANSCO may take immediate measures to attend the problem in LBB

wiring that is extending trip during A/R within one month.

2. TANTRANSCO is recommended to send a detailed report regarding the A/R

status (availability /enabling)on all lines emanating from 230kV NCTPS GS and

enable A/R in all lines emanating from 230kV NCTPS GS.

3.TANGEDCO in coordination with TANTRANSCO may take definite

measures to ensure time synchronization of all relays with GPS signal at NCTPS

end and remote ends at the earliest.

4. It was also suggested that possibility of backing down of generation, in the

event of unavailability of many feeders, in particular when radial feeders only

are in service, may be looked at.

TANGEDCO/ TANTRANSCO TANTRANSCO mail dated 26.07.2019:

1 & 2.Inbuilt LBB function will be enabled in the new distance relays.

3. will be ensured.

4.230kV Kilpauk was operated radially for avoid overloading in the adjacent

feeders due to cable fault in the area.Normally all feeders are operated as grid

feeders.


1. LBB wiring set right and operation of the same has been verified for its

healthiness. -- Completed

2. Since the CBs and the Control & Relay Panels (CRP) are very old and

commissioned during 1993. The Distance relays even though are numerical due to

ageing its display and resetting keys are faulty. Hence it is proposed to replace

the CBs & CRPs with new CBs and Protection relay panel with SAS. A.R will be

put into service after replacing the CB & CRP.

3. Time synchronisation of Protection relays is being carried out . The work is

under progress.

Pending


NCTPS Generating Station

of TANGEDCO

19-05-2019 at

22:44 hr.

230kV lines connected to NCTPS got tripped due to

fault in lines. Running units#1,2 and 3 at 230kV

NCTPS also got tripped due to loss of evacuating

lines.

1. TANGEDCO in coordination with TANTRANSCO to take definite measures

to ensure time synchronization of all relays with GPS signal at NCTPS end and

remote ends at the earliest.

2.The PCSC noted frequent jumper cut/conductor snap instances in the area, of

late; accordingly, it was suggested to have adequate condition monitoring and

preventive maintenance measures.

3.TANTRANSCO to communicate

(i) the schedule of replacement of balance porcelain insulators with polymer

insulators in evacuation lines from NCTPS.

(ii) schedule of insulator washing

4.NCTPS /TANGEDCO to inform regarding house load operation capability of

Generators at NCTPS.

TANGEDCO/ TANTRANSCO TANTRANSCO mail dated 26.07.2019:

2& 3.wedge connector have been provided in order to avoid jumbercut.

4. Replacement of porcelain insulators by polymer insulatos in all 230kV &

400kV feeders in North Chennai area has been completed


1. Time synchro nisation of Protection relays is being carried out on part of S.R &

E.L project. The work is under progress.

2. Preventive maintenance has been carried out by Jumper strengthening with

provision of wedge clamps.

3. 3. (i). Polymer insulators has been provided in all the 400 kV evacuation lines

from NCTPS end up to 5 KMs. Replacement of Polymer insulator in 230 kV lines

are under progress for the 230 kV lines emanating from NCTPS.

(ii). Hotline washing 400 kV & 230 kV Line insulators in the NCTPS area will

be started during last week of February, 2020.

4. Already the backing of generation is being carried out during tripping of more

than two feeders in consultation with LD Centre.

Pending

84/II/4 Tripping of 230kV

Sulurupet-Gumudipoondi

line

11-04-2019 at

16:05 hr.

Triggering incident was B-N fault in 230kV

Gummudipoondi-NCTPS line. 230kV Sulurupet -

Gummudipoondi line tripped on operation of zone-2

distance protection at Sulurpet end and reverse zone

protection at Gummudipoondi end.

1.TANTRANSCO to check the resistive and reactive reach settings of 230kV

Gummudipoondi-NCTPS line at Gummidipoondi end.

2. APTRANSCO to ensure time synchronization of DR and EL at Sulurupet

end. Also in coordination with TANTRANSCO sort out the time synchronization

issue in 230kV Sulurupet-Gumudipoondi line.

3. TANTRANSCO to check the SOTF settings at Gummidipoondi end for

230kV Gummudipoondi-NCTPS line .

TANTRANSCO/ APTRANSCO APTRANSCO mail dated 30.07.2019:

2. GPS not available at 220KV Sullurpet SS.Manually set the timing on

29/07/2019 -- Completed


1. & 3. Will be reviewed


Complied

Complied

84/II/29 Frequent tripping of 220

kV KTPS –Lower Sileru

line

01-05-2019 at

16:04 hr.

04-05-2019 at

14:48 hr.

05-05-2019 at

11:29 hr.

06-05-2019 at

13:14 hr.

B-N FAULT

B-N FAULT

B-N FAULT

B-N FAULT

R-N FAULT

R-B FAULT

R-B FAULT

B-N FAULT

It was noted that no representative of APGENCO attended the meeting.

For the subject line, the following shall be carried out by TSGENCO in co-

ordination with APGENCO:

(i) End-to-end communication for DT/ permissive & other signals may be

ensured by testing at boththe ends.

(ii) Healthiness of PLCC system components (hardware and software) at both

ends shall be checked and faulty components shall be repaired/ replaced.

APGENCO in coordination with TSGENCO to ensure frequent patrolling and

APGENCO/ TSGENCO Yet to be informed Pending

Annexure-II

Page 7 of 39

85/II/14 Tripping of 230kV Theni-

Sabarigiri line

29-05-2019 at

18:39 hrs

3 phase to earth fault occurred in line. Tripped on

ground over current protection 67N at Sabarigiri and

Zone-2 at Theni end.

For the subject line, the following shall be carried out by TANTRANSCO in

coordination with KSEBL:

(i) End-to-end testing for DT/ permissive & other signals may be ensured by

testing at both the ends.

(ii) Healthiness of PLCC system components ( hardware and software) at both

the ends shall be checked and faulty components shall be repaired/ replaced .

TANTRANSCO/ KSEBL TANTRANSCO mail dated 12.02.2020:

The PLCC link between 230KV Theni – Moozhiyar feeder is healthy condition

and non-actuation of Carrier Protection during the fault on 29-05-2019 at 18:39

Hrs was due to the fault sensed in Zone-2 reach at Theni SS and Earth fault at

Moozhiyar SS.

KSEBL mail dated 11.02.2020:

PLCC system in SBTN feeder at Sabarigiri is not working well. Purchase process

for the new panel is under progress.It will be commissioned by April 2020.

Pending

85/II/20 Tripping of 220kV Idukki-

Udumalpet line

05-06-2019 at

15:13 hrs

Triggering incident was R-Y-Earth fault in the

line. Carrier aided protection not operated at

Udumalpet end.

For the subject line, the following shall be carried out by TANTRANSCO in

coordination with KSEBL:

(iii) End-to-end testing for DT/ permissive & other signals may be ensured by


(iv) Healthiness of PLCC system components ( hardware and software) at both

the ends shall be checked and faulty components shall be repaired/ replaced .

KSEBL/ TANTRANSCO TANTRANSCO mail dated 12.02.2020:

Carrier set healthy at Udumelpet end. Healthiness of link will be checked after

getting confirmation from KSEB


PLCC system in IDUD feeder at Idukki is not working well. Purchase process for

the new panel is under progress.It will be commissioned by April 2020.

Pending

85/II/26 Tripping of 400kV

Vemagiri-GMR line-1&2

14-06-2019 at

09:33 hrs

Line-1 tripped on Y-Phase to earth fault due to Y-

Phase LA failure at Vemagiri end. Line-2 tripped at

GMR end only

1. APTRANSCO is recommended to submit Equipment failure report (LA

failure) to CEA.

2.GMR is recommended to submit a report regarding tripping of 400kV

Vemagiri-GMR line-2 at GMR end along-with the related tripping files.

APTRANSCO/ GMR APTRANSCO maild ated 03.10.2019:

1. Equipment (LA failure) Failure report submitted to CEA on 12.07.19.

---Completed

2. Pending

Pending

86/II/7 Tripping of 220 kV KTPS -

Lower Sileru-1

8-7-2019 at

10:45 hrs

Line tripped on B-phase to earth fault. As per FIR,

there was zone-2 operation at KTPS

For the subject line, the following shall be carried out by APGENCO in

coordination with TSGENCO:

i. End-to-end testing for DT/ permissive& other signals may be ensured by


ii. Healthiness of PLCC system components (hardware and software) at both the

ends shall be checked and faulty components shall be repaired/ replaced .

APGENCO/ TSGENCO Yet to be informed Pending

87/II/3 Tripping of 220 kV KTPS-Lower

Sileru line-1

15-08-2019 at 13;04

hr.;

20-08-2019 at 11:23

hr.;

26-08-2019 at 13:43

hr.;

28-08-2019 at 11:17

hr.

Frequent Line tripping due to transient fault in R & Y phase APTRANSCO and TSTRANSCO are requested to take necessary actions to ensure proper tree

clearances and right of way for the subject line.

APTRANSCO/ TSTRANSCO TSTRANSCO mail dated 18.01.2020:

Patrolling has been carried out and tree clearance problem was rectified and the details are

submitted in 88th PCSC meeting.

Pending

87/III/1 Tripping of 230 KV-Neyveli TS

II - Karaikal line-1

17-08-2019 at

00:28hr.

B phase to Earth fault in the line. At Neyveli end A/R not

operated.

NLCIL and PED to submit a report regarding failure of A/R and the reason for the same NLCIL / PED PED letter dated 16.12.2019:

For Zone-1 fault occurred on the line at 00:27:46.448 at Karaikal SS A/R acted and B-pole of the

breaker got opened at 00:27:46.494. While A/R was in running condition, carrier aided trip was

received from TS II, Neyveli at 00:27:46.468 and breaker got opened with A/R lockout relay

getting operated at 00:27:47.407. DR & EL of the incident recorded at karaikal SS is attached

herewith

PED mail dated 21.01.2020:

It has been programmed to test the Auto Reclosure scheme on 230KV Neyveli TS – Karaikal line

and 230KV Karaikal – Bahour line at Karaikal SS with the coordination of M/s.Power Grid

Corporation of India Limited by conducting special testing within this month and on conclusion a

report in this respect will be submitted within a fortnight.

PED mail dated 12.02.2020:

A meeting was convened between M/s.Power Grid Corporation of India Limited and Puducherry

Electricity Department at Head Quarters of this department, Puducherry on 10.02.2020 and the

failure of Auto Reclosure for Tripping of 230 KV Neyveli TS II - Karaikal line-1 on 17-08-2019 at

00:28hr at Karaikal SS was discussed. In the meeting, M/s.PGCIL informed that the PLCC links of

230KV Bahour Auto SS and 230KV Karaikal Auto SS was tested and normalised on 01.02.2020

and there would not be any failure of Auto Reclosure in future. It was also informed that Auto

Reclosure was functional in the 230KV Karaikal - Neyveli Line and there was no communication

link failure so for. Further, M/s.PGICL has consented to conduct testing on 230KV Karaikal -

Neyveli Line and 230KV Karaikal - Bahour LIne at Karaikal SS during the period of Line Clear at

the earliest.

Pending

88/1/1 Complete outage of 220kV

Lower Sileru GS of

APGENCO

22-10-2019 at

05:20Hr.

Triggering incident was fault in 220kV Lower Sileru

– Donkarai line. LBB of both bus-1 and bus-2

operated resulting in complete outage at 220kV

Lower Sileru generating station.

1. APGENCO to submit a detailed report on or before 15th

January 2019, regarding complete

outage of Upper Sileru and Lower Sileru, clearly indicating the protections which operated at

both ends of all the lines which tripped.

2. APGENCO to conduct breaker timing tests and ensure healthiness of all breakers in their

switchyard and if found unhealthy action shall be taken to replace the same.

3. APTRANSCO to furnish a report on factual configuration and settings of the PD and A/R

relays.

APGENCO/ APTRANSCO Pending

Annexure-II

Page 8 of 39

88/IV/4 Tripping of 220kV Chillakallu

Suryapet line-1

17-10-2019 at 13:30

Hr.

Triggering incident was Y phase to B phase fault in the line. At

Chillakallu end, as per the report submitted it is mentioned that

Zone-1 distance protection operated. However, DR is not

available to verify the same. At Suryapet end, Zone-2 distance

protection operated and carrier was not received. Failure of

carrier aided protection at Suryapet end needs review.

The following shall be carried out by TSTRANSCO in coordination with APTRANSCO:

a) End-to-end testing for DT/ permissive & other signals may be ensured by testing at both the

ends.

b) Healthiness of PLCC system components (hardware and software) at both the ends to be

checked and faulty components to be repaired/ replaced.

c) Time synchronization of relays at both ends.

TSTRANSCO,/ APTRANSCO TSTRANSCO mail dated 11.02..2020:

At our end MRT & Telecom wing are ready to carry out end to end testing.

Waiting for confirmation from APTRANSCO end to carry out testing.

Pending APTRANSCO to coordinate with TSTRANSCO

89/I/6 Complete loss of supply at 220

kV Kolar, 220 kVMalur and 220

kV Sarjapur stations.

16-01-2020 at

09:58 Hr.

• Triggering incident was Y-phase jumper cut in 220

kV Kolar (KAR) – Kolar (PG) line-1.

• 220 kV Kolar (KAR) – Kolar (PG) Line-2 tripped

at Kolar (KAR) end only.

• There was complete loss of supply at 220 kV

Kolar, Malur and Sarjapur stations.

i. PGCIL (SR-2) to disable Broken conductor trip and enable Broken conductor alarm.

ii. KPTCL to configure all DR digital channels in relay DR and submit the SPS scheme

implemented at 220 kV Kolar (KAR) SS.

PGCIL (Sr-2)/ KPTCL Yet to be informed Pending

89/IV/3 Tripping of 400kV Warangal –

Bhoopalapally line-114-12-2019 at

19:03 Hr.

• Line tripped at Bhoopalapally end only on DT

received.

• Line was holding from Warangal end.

TSTRANSCO and TSGENCO to expedite the process of replacing PLCC of 400kV Warangal –

Bhoopalapally line-1 and intimate completion of the same to SRPC.

TSGENCO/ TSTRANSCO Yet to be informed Pending

89/IV/4 Tripping of 400kV Dhoni –

Munirabad Line04-01-2020 at

09:32 Hr.

• Line tripped at Dhoni end only on receipt of DT

from Munirabad end.

• Line was holding at Munirabad end.

PGCIL (SR-1) in coordination with KPTCL to replace the faulty auxiliary relay (for sending of

DT during hand tripping) and intimate the same to SRPC.

PGCIL (SR-1)/ KPTCL KPTCL informed vide mail dated 17./03.2020 that the problem with faulty

auxiliary relay (for sending of DT) has been rectified

Complied


Krishnapatnam-Nellore-1

01-07-2019

at 03:40 hrs,

03-07-2019

at 3:42 hrs,

19-07-2019

at 2:25 hrs, 21-

07-2019

at 2:27 hrs, 28-

07-2019

at 1:40 hrs, 28-

07-2019

at 23:39 hrs

Line tripped on operation of over voltage stg-1

protection at Krishnapatnam and direct trip was

received at Nellore. The Y –phase CVT voltage at

Krishnapatnam end was observed to be 8 to 10 kV

higher than the R & B phase voltages

1. APGENCO to configure both OVR start and trip signal in DR or EL.

2. APGENCO in coordination with APTRANSCO to sort out the time sync

issues between Krishnapattanam and Nellore.

APGENCO APGENCO vide letter dated 29.10.2019

The line CVT was tested for secondary voltages, tandelta values and found them

on higher side. Drift in capacitance value observed. Y-ph CVT was replaced with

spare available and voltages found normal compared to other phases.

OVR config and time sync?

Pending

86/II/10 Outage of Bus-2 at 400 kV

RYTPP station of

APGENCO

18-07-2019

at 3:30 hrs

Bus bar protection of 400 kV Bus-2 operated due to

malfunctioning of CT supervisory circuit. All

elements connected to Bus-2 tripped

APGENCO to revise the CT circuit supervision circuit monitoring and tripping

of Busbar at RYTPP.

APGENCO Yet to be informed Pending

87/I/1 Complete outage of 220 kV

Lower Sileru GS of

APGENCO

23/08/2019 at

18:52 hr.

Malopertion of Bus-1 and Bus-2 bus bar protection

lead to tripping of all connected elements at 220 kV

Lower Sileru resulting in complete loss of supply at

220 kV Lower Sileru station.

1. APGENCO to ensure that shift engineers and operators strictly adhere to

operational procedure.

2. APGENCO may explore the possibility of providing proper interlock between

Buscoupler and isolator (i.e., In the event of an element connected to one bus

through respective bus isolator the interlock is intended to disallow closing of

other Bus isolator if Bus coupler is in open condition).

APGENCO Yet to be informed Pending

84/II/9 Tripping of 220kV Bus 2

and connected elements at

220kV Gazuawaka

Substation.

17-04-2019 at 5:40 hr.Triggering incident was Y-phase to earth fault in

220kV Gazuwaka Bus-2. This resulted in tripping of

220 kV elements and 400/220 kV ICT-2

1. APTRANSCO to submit a detailed report regarding the subject tripping at

220 kV Gazuawaka Substation along with the remedial measures taken.

2. For all lines emanating from Gazuwaka SS, RTV coating shall be taken up.

APTRANSCO APTRANSCO mail dated 30.07.2019:

1. The report submitted vide mail dated 29.07.2019 -- Completed

2. Pending

APTRANSCO mail dated 03.10.2019 and 29.10.2019:

2).Tenders is under process for RTV coating of all the lines emanating from

Vizag Switching Station.(VSS) -- Pending

Pending

86/I/3 Complete outage of 220

kV/132kV Paravada SS of

APTRANSCO

08-08-2019 at

11:34 hrs

Triggering incident was failure of Y-ph LA of 220

kV Paravada- VSS (Vizag Switching Station) line at

Paravada end.

1. APTRANSCO to submit equipment failure report to CEA,in respect of the

failed Lightning arrester, and to ensure healthiness of Lightning arresters in

other phases.

2. APTRANSCO shall also regularly perform third harmonic current

measurement (THRC) and measurement of LA stack temperature to monitor

healthiness of LA’s.


1. Equipment failure report to CEA in respect of the failed Lightning arrester will

be sent soon, and healthiness of Lightning arresters in other phases are already

checked on 08-08-2019.

2. Third harmonic current measurement (THRC) kit not available with

APTRANSCO. Measurement of LA stack temperature to monitor healthiness of

all LA’s is done every month along with other equipment and this month testing

is scheduled on 02-11-2019 . --Completed

Pending

Andhra Pradesh

Annexure-II

Page 9 of 39


Simhadiri-Kalpakka line-

1,2&3; 400 kVKalpakka-

Asupaka line-1 &400

kVKalpakka-Gazuwaka

line-2

5-08-2019 at

13:37 hr.

Triggering incident was failure of R-phase LA in

400 kV Kalpakka-Asupaka line.

APTRANSCO to implement line differential protection for 400 kV Simhadri-

Kalpakka line immediately and required OFC/OPGW may be arranged within a

week


The line differential protection was enabled in 400 kV kalapaka

PGCIL(Gajuwaka) I & II feeders, 400 kV kalapaka HNPCL I & II feeders. LC

was programmed on 15.10.2019, 17.10.2019 and 18.10.2019 for testing and

enabling the differential feature in 400 kV Kalapaka Simhadri-2,3, &, 4 feeders.

clearance for testing was not accorded from M/s NTPC. As and when the

clearance is accorded from M/s NTPC the differential feature will be enabled in

400 kv kalapaka Simhadri-2,3&4.

87/1/2 Complete Outage of 220 kV

Vizag Switching Station

and 220 kV Parawada SS of

APTRANSCO

28/08/2019

at 15:3

a. Bus-1 and Bus-2 Bus Bar Protection operated due to

snapping of R-phase dropper jumper at 220 kV VSS r

esulting in the tripping of all the connected elements. b. 400

kV/220 kV ICT#1 and 2 at Gazuwaka also got tripped during

this event.

c.220 kV Paravada SS was radially fed from 220 kV VSS

during antecedent conditions.

1. APTRANSCO to investigate whether ageing or tension led to failure of R-Phase dropper from

Jack bus to bridge which led to complete outage of 220 kV VSS and Parawada.

2. Healthiness of other jumpers at 220 kV VSS shall

be ensured and a report shall be furnished to SRPC. APTRANSCO to submit Thermovision

scanning reports of 220 kV VSS during past 6 months and ensure time sync at 220 kV VSS.

APTRANSCO Yet to be informed Pending

87/III/3 Tripping of 400 kV

Maheshwaram-Narnoor line

22-08-2019 at 4:00

hr.

B-phase to earth fault occurred in line. Auto-reclose was

successful at Mahshwaram and A/R not operated at Narnoor

1. APTRANSCO to submit a report after checking A/R operation.

2. APTRANSCO to configure OVR start in EL.


88/1/4 Complete Loss of Supply at

400/220kV Narnoor station29-11-2019 at

20:08 Hr.

Triggering incident was fault in 400kV Narnoor -

Srisailam line. LBB of Bus-1 operated and all

elements connected to Bus-1 tripped. Since there

was no other infeed to Narnoor station, there was

complete loss of supply at 400/220kV Narnoor

station. In the antecedent, Main breaker of 400kV

Narnoor-Srisailam was in lockout condition and

220kV Narnoor -Somyzulpalli line-1 &2 was in idle

charged condition.

APTRANSCO to ensure proper segregation of loads, generators and ICTs on both

buses in case of one and half breaker scheme while planning of substations


88/II/19 Tripping of 400kV Kalpakka

Vemagiri line-1

28-10-2019 at 09:51

Hr.

Triggering incident was R-N in the line. Fault was sensed in

Zone-1 at both the ends. At both the ends A/R operated and line

got tripped due to persistent fault. But at Kalpaka end, after

A/R operation even though the fault was sensed in zone-1 there

was delayed opening of all 3 ph breakers for around 250ms.

APTRANSCO to submit a report, after consultation with OEM, regarding the delay in tripping of

400kV Kalpakka Vemagiri line-,1 inspite of the fault being detected in Zone-1.


88/II/24 Tripping of 400/220kV ICT-1,

ICT-2 and ICT-3 at Vemagiri

18-11-2019 at 21:54

Hr.

Triggering incident was ICT-2, B-phase LA flashover. ICT -2

tripped on differential protection and ICT-1 and ICT-3 tripped

on over current protection.

APTRANSCO to devise SPS scheme, designed to trip some loads in the event of tripping of any

of the 400/ 220kV ICT’s at Vemagiri, to prevent cascaded tripping of all ICT’s due to overload in

the event of outage of one ICT.

ii. Also APTRANSCO to configure standalone EL with contacts wired from all static relays.


89/1/3 Complete outage of 220 kV

Bommuru SS of APTRANSCO

01-01-2020 at 11:40

Hr.

• Bus bar protection operated resulting in complete outage of

220 kV Bommuru SS.

i. APTRANSCO to enable auto-reclosure in all lines emanating from 220 kv Bommuru SS.

ii. APTRANSCO to ensure time synchronization of relays with GPS at 220 kV Bommuru SS and

220 kV Vemagiri SS.


89/II/17 Tripping of 400 kV Vemagiri –

Sattenapally line of

APTRANSCO

10-01-2020 at 13:59

Hr.

• As reported, bus bar protection of 400 kV Bus-2 operated at

Vemagiri resulting in tripping of 400 kV Vemagiri –

Sattenapalli line.

APTRANSCO to expedite the process of replacing Static BBP at 400kV Vemagiri SS with

numerical BBP, to prevent mal-operations of BBP at Vemagiri SS.


Annexure-II

Page 10 of 39

82/II/1 Tripping of 400kV KTPS

VI- KTPS VII

05-01-2019

at 10:17hrs

Line tripped at KTPS VI end due to suspected mal-

operation of over-voltage protection. Line was in

service from KTPS VII., BUS CVT secondary R

PHASE got grounded at KTPS VI

1) TSGENCO to configure OVR_start and OVR_tripin EL at KTPS-VI end and

sent a report after completion of works related to DT communication channel

between KTPS-VI and KTPS-VII

TSGENCO TSGENCO mail dated 24.06.2019:

The issue is referred to M/s BHEL ( EPC vendor ) and the study on feasibility

for providing the communication with the existing available system is under

process and will be completed during the availability of next shutdown.


TSGENCO informed that the recommendations will be completed in September

2019


DT communication between KTPS-VI stage and KTPS-VII stage has been

provided on 09.08.2019. Hence, it is requested to drop the point,

Pending OVR_start and OVR-trip configured

in EL at KTPS VI ?

83/III/6 Tripping of 400kV

Julurpadu - Manuguru line-

2

14-03-2019 at

06:10:00

Triggering incident was R-ph fault in the line. At

Julurpadu end, fault was sensed in Zone-2 and

carrier was received but due to DT Receive from

manuguru end, A/r not operated and line got

tripped. FIR, DR and EL of Manuguru end are not

available.

It was noted that no representative of TSGENCO attended the meeting.

TSGENCO is recommended to submit a report on the tripping and to furnish

equipment failure report to CEA.

TSGENCO TSGENCO mail dated 24.06.2019:

FIR, DR and EL was uploaded in SRLDC website.Trip Report was also

submitted.


TSGENCO informed that Equipment failure report will be sent to CEA.

Pending

84/II/28 Frequent tripping of 220

kV KTPS –Nunna line

05-04-2019 at

12:55 hr. B-N

FAULT

15-04-2019 at

13:20 hr. Y-N

FAULT

16-04-2019 at

In 155thOCC meeting of SRPC, APTRANSCO

informed that the tripping was due to clearance

issues in the ROW caused by mango tree. It was

cleared and issue was rectified. However, frequent

tripping of line is still persistent.

1. TSGENCO to check the non-operation of carrier aided trip, when fault is

detected at KTPS end in Z-2 and carrier is also received, and submit a report

regarding the same.

2. TSGENCO and APTRANSCO to ensure that ROW is cleared periodically.

3.APTRANSCO & TSGENCO may consider raising the height of towers if the

line is planned to be used in future.

4.TSGENCO to consider replacement of old pneumatic CB’s at KTPS if 220kV

TSGENCO Yet to be informed Pending

87/II/5 Tripping of 220 KV-Srisailam

Right Bank-Nagarjunsagar TS-1

18-08-2019 at 4:23

hr.;

05-09-2019 at 13:50

hr

Suspected mal-operation of Main-2 distance protection relay at

Nagarjunsagar TS-1. Line was holding from Srisailam right

bank.

TSGENCO to carry out the following for tripping of the subject line:

1.Check the SOTF settings and breaker contacts. 2.SOTF auto-initiation shall be kept off (in

settings).

3.Submit a disturbance recorded file after changing the DR time scale to capture 500msec pre

fault and 2 sec post fault events.

TSGENCO Yet to be informed Pending

88/II/3 Tripping of 220kV KTPS-Nunna 27-09-2019 at 14:41

Hr.

· Line tripped at Nunna end only on operation of Zone-2

distance protection.

· It was further mentioned in the report that there was bus

fault at KTPS end.

• Non operation of protection at KTPS end needs review

TSGENCO to verify the relay DRs and EL corresponding to the event and submit a report to

SRPC regarding the event.TSGENCO Yet to be informed Pending

84/II/27 Multiple tripping at 220 kV

Ghanapur station

27-05-2019 at

02:04 hr.

Triggering incident was failure of B-phase CT of

bus coupler of Bus-2. Bus bar protection of 220 kV

Bus-2 operated resulting in tripping of all elements

connected to Bus-2.

1.TSTRANSCO is recommended to submit Equipment failure report to CEA

regarding the blast CT.

2.TSTRANSCO to inform if any old CTs exist in Ghanapur SS and ensure

healthiness of the same to

TSTRANSCO TSTRANSCO MAIL DATED30.10.2019:

1. Informed our transmission wing to submit the Equipment failure report to

CEA.

2. All the existing old CTs are replaced with new one.

Pending

89/II/3 Tripping of 400/220 kV Janagaon

ICT-1 of TSTRANSCO

02-12-2019 at 13:28

Hr.

· ICT tripped due to suspected maloperation of PRV

protection. TSTRANSCO informed that the faulty PRV was replaced on 10.12.2019. TSTRANSCO Yet to be informed Pending

89/II/8 Tripping of Bus-2 at 220 kV

Malyalappali (Ramagundam)

station.

21-12-2019 at 03:10

Hr.

• Triggering incident was B-N fault in 220 kV Malyalapalli-

Ramapur line.

• LBB of Bus-2 operated since B-phase CB of 220 kV

Malyalappali-Ramapur line did not open due of damage in trip

coil

TSTRANSCO to ensure A/R functionality on all lines emanating from 220 kV

Malyalapalli SS and to ensure time synchronization of relays between Rampur

and Malyalapalli.

TSTRANSCO Yet to be informed Pending

89/III/4 Tripping of 400kV

Kethyreddypalli – Shankerpally

Line-1

08-01-2020 at 23:36

Hr.

• Triggering incident was B-N fault in the line. AR operated and

successful at Kethyreddypalli end

• AR not attempted at Shankerpally end

TSTRANSCO to investigate and submit the reasons for delayed opening of TIE

CB Y-ph and B-ph in spite of 3-ph trip issued by relay. Pole discrepancy timing

of TIE CB may also be checked.

TSTRANSCO Yet to be informed Pending

Telangana

Annexure-II

Page 11 of 39

Mail received on 21-10-2015:

1) Anti-pumping contactors of all the nine 220KV Lines are in circuit and tested

periodically during AOH works of lines along with other protections.

2) Completed.

3) Possibility to use both the 220kV buses as main bus under normal operation is

under review.

Mail recieved on 23-11-2015:

1) Completed

3) Two bus operation for 220kV buses : In place of existing CT switching relays,

High speed manual heavy duty change over switch of sufficient current capacity

will be retrofitted to all feeders at 220kV station and same will be operated

manually during changeover of feeder by one bus to the other and this

arrangement may facilitate to put both buses in service. Time required for this

retrofit is around 90days . However, this work will be taken up only after

retrofitting of electromagnetic relays with numerical relays for Main-2 protection

of all 220kV lines, for which work is in progress.

Status received vide mail dated 10-07-2017:

1) --- Completed.

2) --- Completed.

3) Two Bus operation for 220kV bus is being carried out whenever required.

However scheme for tripping of one bus during LBB/fault and maintaining the

other bus intact by tripping B/C breaker will be taken up in R&M works. --- Status received vide KPCL mail dated 14.12.2017:

3) DPR for implementation of Two Bus operation for 220kV bus system has been

prepared and proposal is placed for funds from PSDF. After the approval of the

DPR, the work is proposed to be taken up.


3) KPCL informed that DPR for implementation of Two Bus operation for 220kV

bus system has been prepared and proposal is placed for funds from PSDF. After

the approval of the DPR, the work is proposed to be taken up. Time frame

requested for is 2 yrs.


3) Work proposed to be taken up under PSDF. Approval from Nodal agency is

awaited. However, arrangements have been made to issue NIT.


KPCL informed that Tender would be floated in 1 month and work would be

completed in 2 years.


Arrangements have been made to issue NIT and Tender for the work proposed to

be floated during May- 2019.


NIT will be issued during May- 2019.


1. & 2. Completed

3) Preparation of technical specification is in progress. NIT will be issued during

July- 2019.


KPCL informed that timeline for completion of work is December 2019.


1. & 2. Completed

3) Preparation of technical specification is in progress. NIT will be issued during

July- 2019. timeline for completion of work is December 2019.

KPCL mail dated 30.10.2019 and 17.12.2019 and 11.02.2020:

1. & 2. Completed

3) NIT issued during Aug- 2019. Timeline for completion of work is December

2020.

Status received vide KPCL mail dated 10.07.2017:

1. (ii) Hot line water washing stopped and off line water washing is carried out

whenever the 400 KV Unit or line is under tripped condition / Shutdown

condition. --- Completed

1. (iii) Silicon coating for Unit#8 main & tie breakers carried out in Sep'16 and

same is under observation. Till today in order and good condition. For remaining

breakers, since it is big order, approval for the same is under process. ---

13-04-2016 at

21:12 hrs

Tripping of 400kV Raichur

TPS

Bus-2

46/II/21 Trippings at 220kV Raichur

TPS

07-06-2015 at

01:35 hrs

1. KPCL to check the operation of anti-pumping relay on 220 kV side and keep

it in healthy condition.

2. KPCL to provide manual reset to the 220 kV side master trip relay.

3. KPCL to use both the 220 kV buses as main buses under normal operation,

and should go for single bus operation only during emergencies.

54/II/9 Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed.

Unit-4 got tripped on operation of Generator

Differential, Reverse power & LBB protection.

Operation of LBB protection led to tripping of BUS-

2 at RTPS

Karnataka

1.KPCL to undertake the following remedial measures to avoid breaker

flashovers:

(i) Replacing all porcelain insulators with composite insulators

(ii) Carrying out hot-line water washing of all insulators on regular basis.

(iii) Applying Room Temperature Vulcanizing (RTV) Silicone high voltage

insulator coatings to all bus-connected ceramic insulators of equipment like CT,

PT, CB, Isolators etc.

2.KPCL to take steps to provide dedicated breaker flashover protection to all

breakers at Raichur TPS at the earliest.

Pending

PendingKPCL

KPCL

Annexure-II

Page 12 of 39


1 (iii) As upgradation of 400kV switchyard equip's to be taken under PSDF

funds, Silicon rubber coating for breakers is deffered till then. --- Pending

2. Replacement by Num relay for Units - 5,6 & 7 completed in the month of Oct-

2017. Main-I is Seimens make and Main-II is ABB make. --- Pending


2. Replacement of Numerical relays for Units-5, 6 & 7 have been completed.

Referred to OEM for providing the Breaker flashover protection for all the

breakers.


2. Reply is awaited from OEM of Numerical relays for providing Breaker

Flashover protection for all the breakers --- Pending


1. KPCL assured that porcelain insulator replacement will be taken care in tender

floated for RTPS Busbar modification --- Pending


1) i) Being discussed with other utilitis.

2) Reply is awaiting from OEM to implement the Breaker flash over protection in KPCL mail dated 23.03.2019:

1) (i) & (iii)- Arrangements have been made to issue NIT and Tender for the

work proposed to be floated during May- 2019.

2) Reply is awaiting from OEM to implement the Breaker flash over protection in

the Numerical relays in 400KV station. & Being discussed with other utilities.

It is requested to furnish Necessary logic and settings to implement the breaker

flashover protection


1) (i) & (iii)- NIT floated on 01.03.2019

2) Reply is awaiting from OEM to implement the Breaker flash over protection in Review meeting on 27.06.2019:

SRPC informed that referenc of necessary logic and settings to implement the

breaker flashover protection will be shared soon.


1) (i) & (iii)- NIT floated on 01.03.2019. Cover-I opened. Technical evaluation is

in progress. Approval from Nodal Agency for PSDF funds is awaited.

2) As confirmed during 84th PCSC meeting, SRPC may suggest/furnish referenc

of necessary logic and settings to implement the breaker flashover protection.

reply in this regard is awaited.


1) (i) & (iii)- NIT floated on 01.03.2019. Tender evaluation is completed.

Approval from Nodal Agency for PSDF funds is awaited for placing PO on L1

agency.

2) As confirmed during 84th PCSC meeting, SRPC may suggest/furnish referenc

of necessary logic and settings to implement the breaker flashover protection.

reply in this regard is awaited.

13-04-2016 at

21:12 hrs

Tripping of 400kV Raichur

TPS

Bus-2

54/II/9 Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed.

Unit-4 got tripped on operation of Generator

Differential, Reverse power & LBB protection.

Operation of LBB protection led to tripping of BUS-

2 at RTPS

1.KPCL to undertake the following remedial measures to avoid breaker

flashovers:

(i) Replacing all porcelain insulators with composite insulators

(ii) Carrying out hot-line water washing of all insulators on regular basis.

(iii) Applying Room Temperature Vulcanizing (RTV) Silicone high voltage

insulator coatings to all bus-connected ceramic insulators of equipment like CT,

PT, CB, Isolators etc.

2.KPCL to take steps to provide dedicated breaker flashover protection to all

breakers at Raichur TPS at the earliest.

PendingKPCL

Annexure-II

Page 13 of 39

Status received vide KPCL mail dated 10.07.2017 & 14.12.2017:

Two Bus operation for 220kV bus is being carried out whenever required.

However scheme for tripping of one bus during LBB/fault and maintaining the

other bus intact by tripping B/C breaker will be taken up in R&M works.


3) KPCL informed that DPR for implementation of Two Bus operation for 220kV

bus system has been prepared and proposal is placed for funds from PSDF. After

the approval of the DPR, the work is proposed to be taken up. Time frame

requested is 2 yrs.

KPCL mail dated 20.12.2018 & 23.01.2019:

Work proposed to be taken up under PSDF. Approval from Nodal agency is

awaited. However, arrangements have been made to issue NIT.


NIT will be issued during May- 2019.


Preparation of technical specification is in progress.

NIT will be issued during June/July- 2019.

Review meeting on 27.06.2019:KPCL mail dated 16.07.2019 & 30.10.2019:

NIT will be issued during July- 2019. Time line for completion of work is Dec-

2020.

KPCL mail dated 17.12.2019 and 11.02.2020 :

NIT issued during Aug-2019.

Time line for completion of work is Dec-2020.

54/II/13 Tripping of Units at 220 kV

Raichur TPS

KPCL In view of the availability of two buses along with healthy bus-coupler at 220

kV RTPS, KPCL is recommended to put in service the double-bus operation at

220 kV RTPS by suitably distributing loads within 15 days.

During testing of retrofitted distance protection in

400kV Raichur-2 feeder, LBB protection trip DC

got extended to Bus trip. This resulted in tripping of

220kV bus at RTPS and all connected 220 kV

elements. Unit-4 which is connected to 400 kV Bus

got tripped due to tripping of Station Utility

Transformer that is connected 220 kV bus

Timeline?15-04-2016 at

15:36 hrs

Pending

Annexure-II

Page 14 of 39


1. All logics checked and found normal. LBB timing checked and found 200msec

as per KPTCL MRT recommendation. - Completed

2. Work Under Progress ---- Pending

3. New GPS System commissioned along with new numerical and synchronised

with GPS system - Complied

4. Work Under Progress ---- Pending

Status received vide mail dated 14.12.2017:

1),3),4) Completed

2. Auto Start of DG set is taken up --- Pending


2. KPCL informed that for AMF of DG, Scheme prepared & material

procurement under process. The AMF scheme will be implemented in January

2018. --- Pending

3. The GPS system commissioned on Nov 2016 & all the numarical relay time

synchronised with GPS ---- Completed


KPCL informed that Tender for the work would be floated by January 2019 and

work would be completed in 1 year.


1) Completed.

2) Tender for the work would be floated by February 2019 and work would be

completed in 1 year....Pending

3) Completed.

4) Tender for the work would be floated by Feb, 2019, and work would be

completed in 1 year....Pending


2) Tender for the work proposed to be floated during May- 2019 after model code

of conduct and work would be completed in 1 year .

4) Tender for the work proposed to be floated during May- 2019 after model

code of conduct and and work would be completed in 1 year.


Tender will be floated during 3rd week of May- 2019.


1 & 3) Completed.Review meeting on 27.06.2019:

.1 & 3) Completed.

4) Tender published on 21.06.2019 and time line in June 2020.

2. tender has to be issued. Timeline requested upto December 2020.

KPCL mail dated 16.07.2019 :

1 & 3) Completed.

2 ) NIT will be issued during Aug-2019.

4) Tender published on 21.06.2019. Time line for completion of Work is Dec-

2020.


1 & 3) Completed.

2 ) NIT issued during Sept-2019.


2020.


1 & 3) Completed.

2 ) NIT issued during Sept-2019. Tender evaluation is inprogress.

4) As per the directions of TESG of NLDC i..e. Numerical relays are being

provided for all Units and Lines, the proposal of providing Disturbance recorder

is excluded from DPR submitted for availing funds from PSDF - Issue may be

dropped. --- Dropped


Numerical Generator protection relay replacement proposed to be taken up

alongwith SCADA work.


Will be taken up along with SCADA work. NIT to be issued on Jan-2019


KPCL informed that Tender for the work would be floated by March, 2019, and

work would be completed in 1 year.


Tender for the work would be floated by February-2019 and work would be

completed in 1 year.


Tender for the work proposed to be floated during May- 2019 after model code of

conduct and work would be completed in 1 year


Tender will be floated during 3rd week of May- 2019.


Tender published on 21.06.2019.


1) KPCL to check settings of LBB protection in all relays from which it was

implemented, and ensure that their configuration, logic, and timing are in order

at their 220 kV Kadra PH.

2) KPCL to furnish details regarding the existing LT auxiliary supply

arrangement at their 220 kV Kadra PH, and take steps to provide a suitable Auto-

Main-Fail (AMF) panel for DG set to effect its auto-starting in case of failure of

LT supply.

3) KPCL to ensure time-sync of all relays (DR’s & EL’s) with GPS at their 220

kV Kadra PH.

4) KPCL to provide stand-alone Event Logger at their 220 kV Nagjheri PH.

LBB of 220kV Kodasalli breaker at Kadra end got

operated which resulted in tripping of Bus at Kadra

and in turn led to tripping of all elements

06-09-2016

at 14:40 hrs

KPCL to take steps to replace the existing static protection relays for Generator

Units and Generating Transformers (GT’s) with suitable Numerical relays at

their 220 kV Kadra PH.

While de-synchronising of Unit-2, B-phase pole of

GCB did not open and pole descrepancy relay

operated. Hence all 220KV lines CB hand tripped.

58/I/3

(GD)

69/II/8 Tripping of 220 kV Kaiga-

Kadra line-1

Pending


Kadra power station of

KPCL

06-10-2017 at

22:22 hrs

PendingKPCL

KPCL

Annexure-II

Page 15 of 39


Tender published on 21.06.2019. Time line for completion of Work is Dec-2020.


Tender published on 21.06.2019. No bids received for the tender. Hence, it is

proposed to refloat fresh tender with revised PQR and scope of work. Avaialing

approval in this regard is in progress.


Sedam, Shahapur,

Shahabad, Kapanoor,

Humnabad and Halabarga

Stations of KPTCL

01-02-2018

at 17:46 hrs

High resistance fault occurred in 110kV Sedam-

Chittapur line near Sedam end. Line DEF operated

and backup OC protection of 100MVA transformer

operated at Sedam end. But line breaker and

transformer HV breaker didn’t open due to problem

in trip circuit. This resulted in cascade tripping of

upstream feeders and power supply was lost to six

220kV stations of KPTCL.

KPCL to disable GFC protection on all lines emanating from their generating

stations.

KPCL Review Meeting on 21.12.2018

KPCL informed that compliance w.r.t. Implementing the recommendation would

be furnished soon.


'GFC protection will be disabled in all lines in coordination with M/s.KPTCL

KPCL mail dated 10.05.2019 & 25.06.2019:

Letter addressed to CE, RT, KPTCL dated: 10.04.2019 to disable GFC

protection in all 220kV lines . Reply is awaited.

KPCL mail dated 16.07.2019 & 30.10.2019 & 17.12.2019 & 11.02.2020:

Letter addressed to CE, RT, KPTCL dated: 10.04.2019 to disable GFC

protection in all 220kV lines . Reply is awaited.

Pending


Varahi power station

15-03-2018 at

22:36 hrs

There was Y-phase to ground fault on 220 kV

Varahi - Shimoga line-2. Consequent to persisting

fault in ‘Y’ phase, the breaker failure protection

operated resulting in operation of 220KV bus bar

protection at Varahi, tripping all the connected lines

and Varahi running units.

KPCL to take steps to put double-bus operation into service at their 220 kV

Varahi PH.

KPCL Status received vide mail dated 25.07.2018:

Under Implementation.

KPCL mail dated 20.12.2018 & 23.01.2019 & 23.03.2019:

Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service

after April-2019


4 Set of Isolators of VS1, VS2 & VM2 bay of North Bus were cmpleted.

Remaining bays will be completed after Concurrence of LC from LDC

KPCL mail dated 25.06.2019 & 16.07.2019 & 30.10.2019:


Remaining bay will be completed after monsoon season i.e during November -

2019


4 Set of Isolators of VS1, VS2 & VM2 bay of North Bus were cmpleted. Several

times LC is requested for carrying out work for remaining bay. However, LC is

awaited from SLDC.

Pending

78/I/1 Complete Outage of 220 kV

Varahi UGPH.

24-08-2018 at

11:00 hrs

Due to suspected mal-operation of 220KV bus bar

protection at Varahi, all the connected lines and

Varahi running Units got tripped. (6 nos 220kV

lines and 4 nos Varahi generating station running

Units). This resulted in complete outage of 220kV

Varahi UGPH

1. KPCL to take steps to put double-bus operation into service at their 220 kV

Varahi UGPH by December, 2018.

2. KPCL to employ correct operational practices like keeping DC fuses of B/C

CB intact during bus changeover works, disabling back-up protections of B/C

CB during bus changeover works & enabling them with proper settings only

when it is used as Main-CB of the grid elements.

KPCL KPCL mail dated 20.12.2018 & 23.01.2019:

1. Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service

after April-2019 --- Pending

2. ---- Completed.


1) Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in

service after April-2019



Remaining bays will be completed after Concurrence of LC from LDC.

KPCL mail dated 25.06.2019 & 16.07.2019 & 30.10.2019:


Remaining bay will be completed after monsoon season i.e during November -

2019

KPCL mail dated 17.12.2019 and 11.02.2020

4 Set of Isolators of VS1, VS2 & VM2 bay of North Bus were cmpleted. Several

times LC is requested for carrying out work for remaining bay. However, LC is

awaited from SLDC.

Pending


1) Preparation of technical specification is completed. Tender will be floated

during 3rd week of May- 2019 for control & protection system along with

SCADA.

2) English Electric make static type relay is used for NPS protection system at

Unit no.2. The detailed report shall be furnished shortly.


1) Preparation of technical specification is completed. Tender will be floated

during 1st week of July 2019 for control & protection system along with SCADA.

2) Existing relays are English Electric Static typeKPCL mail dated 16.07.2019:


2020.

2) Completed.

KPCL mail dated 30.10.2019 & 17.12.2019 & 11.02.2020:

1) Tender published on 21.06.2019. No bids received for the tender. Hence, it is

proposed to refloat fresh tender with revised PQR and scope of work. Avaialing

approval in this regard is in progress.

2) Completed.

KPCL to take steps to replace the existing static protection relays for Generator

Units and Generating Transformers (GT’s) with suitable Numerical relays at

their 220 kV Kadra PH.

While de-synchronising of Unit-2, B-phase pole of

GCB did not open and pole descrepancy relay

operated. Hence all 220KV lines CB hand tripped.

1) KPCL to ensure that DR and EL for all events are made available. If Static

relays with no DR are present in Station, standalone Disturbance recorder and

Event logger should be provided.

2) KPCL to investigate the operation of Negative sequence relay and report to

SRPC since the operation of Negative sequence relay due to stuck breaker

condition is not proper as per protection philisophy

82/I/3 KPCLComplete Outage of 220kV

Kadra Power House of

KPCL & 220kV Karwar SS

of KPTCL

69/II/8 Tripping of 220 kV Kaiga-

Kadra line-1

Pending

Pending06-10-2017 at

22:22 hrs

During de-synchronising of Kadra unit#2, R-pole

didn’t open due to struck breaker condition. Pole

Discrepancy operated. All the connected 220kV

lines at Kadra end were hand tripped.

04-02-2019 at

20:19 hrs

KPCL

Annexure-II

Page 16 of 39

87/I/3 Complete Outage of 220kV

Kemar, MSEZ,

Puttur&Kavoor stations of

KPTCL

29-09-2019 at 11:31

hrs

a. Single line to ground fault occurred in 220kV Kemar –

Varahi line-2 due to R-phase insulator flashover and the line

tripped on Zone-1 distance protection. Simultaneously, 220kV

Kemar – Varahi line-1 tripped at Kemar end only.

b. 220kV Kemar –Varahi line-3 tripped due to overloading.

This resulted in complete loss of supply at 220kV Kemar since

all the three source feeders tripped.

c. In addition there was complete loss of supply at 220kV

MSEZ, 220kV Kavoor and 220kV Puttur stations since these

stations were radially fed from 220kV Kemar station.

KPCL to check A/R functionality for all lines emanating from 220 kV Varahi GS and submit a

report regarding the same.

KPCL Yet to be informed Pending


1. In view of operating 220kV Ambewadi SS in split bus mode, action is being

taken up by KPTCL. Problem in the 220kV bus coupler breaker is attended and

isolator overhauling work is under progress. Spilt bus operation at Ambewadi

will be made possible at the earliest. --- Pending

2. ICT Protection system at Ambewadi and trippings occured at Supa GS during

the instance is checked up and remedial measures already furnished in this

regard. KPTCL Mail dated 16.12.2017 & Review Meeting dated 19.12.2017:

1. Recommended works at Ambewadi have not been taken up due to various

problems faced due to poor response from the turn key agency M/s ERL. A site

meeting is planned during this month to discuss about further plan of action for

attending SRPC recommendations pertaining to the Sub station.

The issue was discussed in the review meeting. Considering the importance of the

substation and delay in executing the works, it was decided to escalate all

pending issues relating to Ambewadi SS to KPTCL top Management for early

completion.


1. The outstanding protection issues pertaining to Ambewadi were appraised to

the management and proposal for construction of new GIS SUb stations has been

approved by KPTCL management. In view of attending protection audit

recommendations pertaining to Ambewadi SS without linking with new Station

proposal, action has been taken to include the works in extended scope of R&U

project awarded to M/s GE T&D India Limited. Addition materials required are

yet to be supplied by M/s GE.


1. KPTCL will inform the status on progress of work.


1. BBP provided at Ambewadi SS. - Completed


Procurement of Bus bar and LBB protection is in the final tendering stage. 2.

Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor

line. AR will be enabled.


1. Procurement of Bus bar and LBB protection is in the final tendering stage.

2. Action is being taken to restore the carrier protection for 220kV Sedam-

Tandoor line. AR will be enabled after restoration of PLCC.

KPTCL mail received on 23-01-2016:

1. Bus bar protection panels pocured and erected at Sedam. Wiring , testing

,commissioning is being taken up.Planned to complete by April 2016.



KPTCL Mail recieved dated 22-11-2017:

1 & 2). Bus Bar Protection panel and required Wave traps are supplied under

R&U. Wave trap to be commisioned in Tandoor line and PLCC to be

restored.Once PLCC is restored AR will be enabled. The Wave traps required are

supplied under R&U project and the same is to be commisioned at Sedam end for

restoration of PLCC.


1 & 2) Replacement of Bus Bar Protection is included under R&U project.

Awarded to M/s GE Ltd. Panels have alredy been supplied by the Agency. The

work will be taken up on top priority.


KPTCL informed that the works relating to put A/R in service are going on at

their Sedam SS, and assured that it would be put into service by February, 2018.


1). Bus Bar Protection Work is under progress. Work will be completed in 2

months.

---- Pending

2). ---A/R was enabled from Sedam end on 03.11.2018 ----Completed.


1. Timeline - September 2019

2. Completed

GD-1 at 220kV Ambewadi

Station of KPTCL

Complete outage at 220kV

Sedam Substation of

KPTCL (GD-1)

Triggering incident was B-phase to earth fault in

220kV Ambewadi- Nagzari line-1. B-pole of breaker

did not open at Ambewadi end. LBB protection not

available at Ambewadi end. All elements tripped on

Zone-2 from remote ends.

22-12-2014

at 21:22 hrs

40/I/1

R-Phase to ground fault occurred on 220kV Sedam-

Shahpur line. Fault not cleared from Sedam end due

to stuck-breaker condition. While the Sedam-

Sahapur line tripped from Shahapur end in Zone-1,

the other 220 kv lines from Sedam tripped at remote

ends in Zone-2. This caused complete outage of

220kV Sedam substation.

27-01-2015 at

8.00 hrs

41/I/4

1. Till the completion of R&M works for bus bar and LBB protection, KPTCL

shall explore the possibility of having split bus operation at Ambewadi and

submit the details of the same to PCSC forum.

2. KPTCL shall provide the details of the tripping of Supa hydro station

connected downstream from 110 kV bus.

Pending 1. Status?KPTCL 1. KPTCL to provide Bus bar and LBB protections for 220 kV bus at Sedam

S/s.

2. KPTCL to implement A/R feature on 220 kV Sedam-Tandur inter-state

line.

KPTCL Pending

Annexure-II

Page 17 of 39


1. The work is under progress, expected to be put in to service before end of

February 2020

2. AR was implemented. But due to problem with single phase trip relays the

same was disabled. Now the same has been attended and expected to be put in to

service before end of February 2020

R-Phase to ground fault occurred on 220kV Sedam-

Shahpur line. Fault not cleared from Sedam end due

to stuck-breaker condition. While the Sedam-

Sahapur line tripped from Shahapur end in Zone-1,

the other 220 kv lines from Sedam tripped at remote

ends in Zone-2. This caused complete outage of

220kV Sedam substation.

27-01-2015 at

8.00 hrs

41/I/4 Pending 1. Status?KPTCL 1. KPTCL to provide Bus bar and LBB protections for 220 kV bus at Sedam

S/s.

2. KPTCL to implement A/R feature on 220 kV Sedam-Tandur inter-state

line.

Annexure-II

Page 18 of 39


1. Bus Bar protection will be provded under R&U.

2. A/R yet to be enabled.





KPTCL Mail Recieved dated 22-11-2017:

Bus Bar Protection panel and required Wave traps are supplied under R&U.

Wave trap to be commisioned in Tandoor line and PLCC to be restored.Once

PLCC is restored AR will be enabled.

KPTCL Mail dated 16.12.2017:Review meeting on 27.06.2019:

1. Timeline - September 2019

2. Completed


1. The work is under progress, expected to be put in to service before end of

February 2020

2. AR was implemented. But due to problem with single phase trip relays the

same was disabled. Now the same has been attended and expected to be put in to

service before end of February 2020





KPTCL Mail Recieved dated 22-11-2017 & 16.12.2017:

1.Enabling the AR feature was discussed during PCSC meetings and since

Ambewadi-Ponda and Ambewadi-Xeldom lines are radial lines, it was decided

that enabling AR is not required. To clear the faults in the abovelines early, the KPTCL mail dated 20.12.2018:

The protection issues pertaining to Ambewadi was appraised to the

management and proposal for construction of new GIS SUb stations has been

approved by KPTCL management. Further as per SRPC directions and in view of

attending protection audit recommendations pertaining to Ambewadi SS without

linking with new Station proposal, action has been taken to include the works in

extended scope of R&U project awarded to M/s GE T&D India Limited. Addition

materials required are yet to be supplied by M/s GE. work expecnted to be

completed in 5 months.


1. Since 220kV Ambewadi -Ponda line is radial, this recommendation is dropped.

2. Timeline will be in timated by KPTCL


1. 220kV line breaker replacement work under progress at Ambewadi. AR will

implemented after replacement of CBs -- Pending

2. BBP provided at Ambewadi -- Completed

42/I/1

42/I/2

(GD)


Ambewadi substation of

KPTCL

12-03-2015 at

7:51 hrs

Fault occurred in 220kV Sedam-Shahpur line15-02-2015

at 14:24 hrs


Sedam substation of

KPTCL

Fault in 220kV Ambewadi-Nagjheri line-2

1. KPTCL to provide Bus Bar protection and LBB protection at Sedam S/s and

furnish the status of their implementation to PCSC forum.

2. KPTCL to implement A/R feature on 220 kV Sedam-Tandur inter-state line.

PendingKPTCL

PendingKPTCL1. KPTCL shall provide A/R feature on Ambewadi – Ponda 220 kV D/C inter-

state line.

2. Till the completion of R&M works for bus bar and LBB protection, KPTCL

shall explore the possibility of having split bus operation at Ambewadi and

submit the details of the same to PCSC forum.

Annexure-II

Page 19 of 39

KPTCL mail received on 23-01-2016:

Will be complied in a months time.


Enabling the AR feature was discussed during PCSC meetings and since


that enabling AR is not required. To clear the faults in the abovelines early, the

timings of the Zone 2 was reduced to 150mS and the Back Up EFR timings have

been reducedto 150mS.


Enabling the AR feature was discussed during PCSC meetings and since


that enabling AR is not required. To clear the faults in the abovelines early, the

timings of the Zone 2 was reduced to 150mS and the Back Up EFR timings have

been reduced to 150mS. In view of the above, it is requested to drop the issue KPTCL mail dated 20.12.2018:

The protection issues pertaining to Ambewadi was appraised to the

management and proposal for construction of new GIS SUb stations has been

KPTCL KPTCL to fast-track providing A/R on all 220 kV lines emanating from

Ambewadi SS to prevent Station shut-down on temporary faults.

Outage of 220kV

Ambewadi station in

Karnataka

220kV Ambewadi-Nagjheri line-2 tripped on B-

phase to earth fault. This resulted in loss of supply

to 220kV Ambewadi bus. 220kV Ambewadi-Ponda

line-1&2 were hand tripped after deenergization of

bus at Ambewadi.

30-09-2015 at

10:41 hrs

48/I/3 Status?Pending

Annexure-II

Page 20 of 39

KPTCL Mail received dated 25-04-2017:

Replacement of existing BBP by new BBP with 4 zone protection is being taken

up under R&U.


GE Ltd has already supplied the necessary Bus Bar protection panels for

replacement of the existing static type BBP by new numerical BBP with 4 zone

protection under R&U project. The work of commissioning the same will be

taken up shortly.


Due to operational constraints two/ multi bus operation is not being implemented.


It was noted that Shimoga SS is having required configuration for providing

double-bus operation. However, due to large no. of feeders (15 in no) with

variable gneration at certain remote ends like Varahi, the flows on these lines are KPTCL mail dated 20.12.2018:

Bus sectionaliser breakers have to be provided for operating Shimoga in multi

bus mode. Estimates have to be prepared by CEE,TZ,Hassan. Work expected to

be completed in 1 year.


After commissioning of numerical BBP bus split trial operation was made.

However for providing more reliability, action is being taken for providing

bussectionaliser breakers.

KPTCL mail received dated 25.04.2017:

Numerical BBP is being provided under R&M works


Tesing & Commissioning of numerical BBP at Somanahalli is under progress.

There was some technical issue wth BBP scheme supplied to Somanahally which

is being finalised in consultation with OEM SIFANG. Numerical BBP will be

commissioned at Somanahally within a month's time.


Numerical Bus Bar protection Scheme will be commissioned at Somanahally

before end of December 2017.


The work of providing Bus Bar Protection to 220kV buses is incuded under

R&M works envisaged at Somanahally. The R&M work is expected to be

completed before end of March 2019 ----- Pending


status of work and timeline will be given by KPTCL


The work is to be executed by the R&M turn key agency


Ambewadi station

02-04-2018 at

13:46hrs

Loss of supply occurred to 220 kV Ambewadi

station due to tripping of 220kV Nagzhari-

Ambewadi line-2 (Source) from Nagzhari power

station. After bus dead, Ambewadi-Ponda lines – 1

& 2 were hand-tripped. In antecedent conditions,

220kV Ambewadi - Nagjheri ckt-1, 220kV

Ambewadi-Narendra Ckt-1 &2 were out of service.

1). KPTCL to review operation of SPS at NPH for proper functionality and

changed network conditions (reduction of generation with tripping of evacuating

lines) and put it into service at the earliest.

2). KPTCL to furnish equipment failure report of the current incident (R-phase

CT in Nagjheri – 1 bay at Ambewadi SS) to PSE&TD Division of CEA with a

copy marked to SRPC.

KPTCL KPTCL mail dated 20.12.2018:

1). To be reviewed. Expected to be completed in 1 month.---- Pending

2), Being followed ----- Pending


1. Nagjheri SPS shall be studied in view of changed system configuration

2. Completed




Pending

74/II15 Multiple Trippings at

400/220kV Guttur station

21-04-2018 at

12:50 hrs

Triggering incident was fault in 220 kV Davanagare

- Shimoga line. Bus bar protection operated at

Guttur resulting in tripping of all the connected

elements. 220 kV Guttur was on single bus

operation due to CVT problem in Bus-2.

KPTCL to put double-bus operation at their 220 kV Guttur substations by

attending to Bus-2 CVT problem.


Bus-2 CVT problem is attended. However due to breaker replacement works,

220kV side operated in single bus mode.


KPTCL informed that double-bus operation at their 220 kV Guttur would be

provided within two months.


Timeline will be communicated by KPTCL

Pending

79/III/9 Tripping of 400 kV JSWEL

–Guttur line

29-09-2018

at 11:30 hrs

R-phase to earth fault occurred in line. Auto-reclose

was not attempted at JSWEL due to DT receive. At

Guttur end auto-reclose could not be validated with

DR/EL.

KPTCL to furnish a detailed report on tripping event bringing out reasons for

DT sending from Guttur end to JSWEL on 400 kV Guttur - JSWEL line along

with remedial action taken to PCSC forum.

KPTCL Review Meeting on 21.12.2018:

KPTCL was aksed to furnish status of implementation of the recommendation

given at the earliest.


report will be submitted by KPTCL

Pending

62/II/5 PendingKPTCLKPTCL to provide numerical Busbar Protection at their 220 kV Somanahalli SS

at the earliest.

Triggering incident was fault in 66 kV Somanahalli -

Bannerghatta line and fault was cleared by operation

of Back-up OCR at Somanahalli end.


Shimoga substation

20-01-2017 at

14:34 hrs

Tripping of 220 kV South

Bus and connected

elements (220kV HSR,

220kV Nagnathpura, 220

kV Harohalli, 220 kV

Subramanyapura, 220 kV

Tataguni, 220 kV Mallur

and 400/220kV ICT-2 and

3) at 400/220kV

Somanhalli substation of

KPTCL

(Load loss: 850 MW)

KPTCLKPTCL to operate 220 kV Shimoga on multi-bus operation under normal

conditions, and put it on single-bus operation only under emergency conditions.

220kV Bus Bar protection operated during failure of

R phase CT in DVG-2 line bay.

22-02-2016 at

15:03 hrs

Pending

Annexure-II

Page 21 of 39

80/II/7 Tripping of 400 kV JSWEL-

Guttur line

17-10-2018 at

02:04 Hrs

Triggering incident was R-phase to earth fault in

line. At Guttur end there was operation of pole

discrepancy and resulted on tripping of Y & B pole

after a duration of 2 seconds from the occurrence of

fault. FIR, DR & EL of Guttur end were not

furnished.

KPTCL to examine the reasons for sending of DT from Guttur end to JSWEL

end, and furnish an action taken report including remedial measures taken to

rectify the same.

KPTCL Review meeting on 27.06.2019:


Pending


Ambewadi Station of

KPTCL

06-02-2019 at

14:51hrs

Fault occurred while test charging of 220kV

Ambewadi – Nagjheri Line -2 from Ambewadi end.

Suspected stuck breaker condition at Ambewadi

end) led to clearing of fault by tripping of remote

end breaker in Zone-2. LBB protection is not active

at 220kV Ambewadi station.

KPTCL to investigate the reason for non-tripping of 220kV Ambewadi -

Nagjheri line-2 on operation of SOTF and submit a report regarding the same to

SRPC. Also KPTCL to take necessary measures in order to ensure healthiness of

breaker before testcharging of any line.



Pending

82/II/12 Tripping of 400kV Kaiga-

Guttur line-1&2

07-02-2019

at 11:49 hrs

Line-1 tripped due to insulator flashover. Line-2

tripped due to zone-3 operation at Kaiga and Direct

trip receive at Guttur

KPTCL is recommended to take necessary measures to ensure that Main-I and

Main-II at Guttur end shall be of different types (make and model) coherent with

the general protection philosophy followed in SR region.


KPTCL informed that the recommendation has been included as part of R & M

work. Timeline will be informed

Pending

84/II/12 Tripping of 400kV DHONI

GUTTUR line- 1

18-04-2019 at

18:59 hr.

Triggering incident was failure of B-ph CB of

400kV Dhoni-Guttur line at Dhoni end. This

resulted in the operation of LBB of bus-1 and DT

was sent to Guttur end

1. KPTCL to send equipment failure report, corresponding to the failed CB at

Dhoni SS, to CEA.

2. KPTCL to ensure time synchronization at Guttur end.

KPTCL Yet to be informed Pending


Nelamangala-Mysore line-2

01-05-2019 at 02:29 hr.Line tripped on operation of over voltage stg-2 at

Nelamangala end

KPTCL to ensure time synchronization of DR and EL with GPS signal at

Nelamangala end.


84/II/24 Tripping of 400/220 kV

ICT-1&3 at Hoody

Substation

13-05-2019 at

15:35 hr.

ICT-3 tripped on operation of 59N neutral

displacement relay. ICT-1 tripped on OCR.

KPTCL to inform PCSC forum regarding the changes implemented in Hoody

ICT SPS and to ensure time synchronization of relays at Hoody SS.


85/I/4 Tripping of 220kV Sedam-RTPS

line-1&2 and 220kV Sedam-

Tandur line

14-06-2019

at 02:00 hrs

Tripped on Directional Earth Fault indications in

Main-2 relay at Tandur end for fault at Raichur end.

Sedam end details not furnished.

1. KPTCL is recommended to enable A/R on all lines emanating from 220kV

Sedam SS.

2.KPTCL is recommended to commission BBP at 220kV Sedam SS

immediately.


The work is under progress, expected to be put in to service before end of

February 2020

Pending

85/II/5 Tripping of 400/220 kV ICT-3 at

Nelamangala substation19-05-2019

at 16:11 hrs

As per FIR, ICT-3 got tripped on operation of High

Set Over current trip on 400kV side

1. KPTCL is recommended to enable auto-reclosure on all lines emanating

from 400/ 220kv Neelamangala SS and to ensure time synchronization of relays

at Neelamangala SS.


85/II/11 Tripping of 400kV Hoody-

Yelahanka line-125-05-2019

at 20:41 hrs

Line tripped at Hoody end only and was holding

from Yelahanka.

KPTCL is recommended to check the spurious operation of SOTF protection at

Hoody SS and submit a report to SRPC regarding the same .


85/II/12 Tripping of 400/220 kV ICT-1at

Guttur Substation26-05-2019

at 10:00 hrs

LV side of 400kV/220kV 315MVA ICT#1 Guttur

got tripped due to CB lockout (B phase)because of

low SF6 gas in the CB

1. KPTCL is recommended to submit a report to SRPC after the CB pressure

leakage problem is attended by OEM.

2.. KPTCL to ensure that during recharging of Circuit breakers, cylinders with

Non-return valve only are used to prevent sudden pressure drop in Circuit

breakers.


85/II/22 Tripping of 400kV Dhoni-

Munirabad line06-06-2019

at 02:01 hrs

Line got tripped at Dhoni end. From DR Zone-3

start, PSB and A/r block was observed.

KPTCL is recommended to submit a report regarding PSB maloperation along-

with the RM suggested by OEM. Proper legends shall be ensured for digital

signals at Doni end.


85/II/27 Tripping of 400/220kV ICT-2 at

Hoody substation16-06-2019

at 19:20 hrs

ICT-2 got tripped on operation of over-flux

protection

KPTCL is recommended to adopt v/f settings as per manufacture suggested

curve.

v/f setting for alarm: 1.1 time Vnominal; Time delay 10 seconds;

v/f trip setting : v/f is 1.2 time Vnominal;Time delay 60 seconds


Annexure-II

Page 22 of 39

85/II/29 Tripping of 400kV Hiriyur-

Nelamangala line-1 and 400kV

Gooty-Nelamangala line

22-06-2019 at

04:06hrs

400kV Hiryur-Nelamangala line-1 : 'Y' phase

bushing of Hiriyur line-1 reactor failed at

Nelamangala end resuting in a R-Y phase fault.

Direct trip was sent to Hiryur.

400kV Gooty-Nelamangalaline : Line tripped at

Nelamangala end only due to mal-operation of Main-

2 distance protection relay (THR).

KPTCL is recommended to submit equipment failure report to CEA regarding

the reactor bushing failure and also to sort out time synchronization issues of

400kV Hiriyur-Nelamangala line.


85/II/30 Tripping of 400/220kV ICT-1&2

at Munirabad substation24-06-2019

at 20:50 hrs

400/220kV ICT-1&2 at Munirabad end got tripped

due to operation of High set of backup earth fault

relay during failure of Y phase CT in 220kV

Munirabad-Kalyani steel feeder at Kalyani steel end

KPTCL is recommended to submit equipment failure report to CEA regarding

the CT and PT failure.


86/II/9 Tripping of 400 kV Neelamangala-

Mysore line-2

15-07-2019

at 2:02 hr

line tripped on operation of OV st-1 protection at

Neelamangala end and DT was received at Mysore end. DR of

Nelamangala end was not available for validation of OV

protection operation

KPTCL to configure both OVR start and OVR trip in DR or EL at 400 kV Neelamangala SS. Time

sync issues at 400 kV Neelamangala SS shall also be sorted out immediately.


DR triggering has been done for OVR stage-1 operation in Mysore-2 line . GPS time

synchronisation of Power Grid bays will be taken up along with panel replacement work

envisaged under R&M.

OVR_start also to be configured.

Pending

Annexure-II

Page 23 of 39


1. coordination of KPCL has been requested for enabling AR lines terminated to

Nagajari.

2. AR will be enabled at Ambewadi end for lines other than Ponda and Xeldom

lines during retrofitting of Back Up protection by Distance protection relay at

Ambewadi.

KPTCL Mail dadted 16.12.2017 & Review Meeting dated 19.12.2017:

1. KPTCL informed that Coordination of KPCL has been requested for enabling

AR lines terminated to Nagajari.

--- Pending

2. KPTCL informed that AR would be enabled at Ambewadi end for lines other

than Ponda and Xeldom lines during retrofitting of Back Up protection by

Distance protection relay at Ambewadi. -- Pending


2). Readiness from KPTCL for implementing AR is already confirmed to KPCL.

Decision pending from KPCL end.



version Numerical Line protection relays having IEC61850. Prepration of



1) Budgetary offer obtained for replacement of existing PZ1000 relays with new

version Numerical Line protection relays having IEC61850. Preparation of

estimation and specification is under progress.

KPCL mail dated 25.05.2019 & 16.07.2019:



of NLDC for DPR is awaited. Further, availing administrative approval for issue

of NIT for replacement of existing PZ1000 relays with new version Numerical

Line protection relays having IEC61850 and preparation of estimation and

specification is under progress. Timeline for completion of work is July 2020.

KPCL mail dated 30.10.2019



of NLDC for DPR is awaited. NIT issued through e-portal on 16.09.2019. Pre-

bid meeting was held on 10.10.2019. Finalising of replies to pre-bid queries is in KPCL mail dated 17.12.0219 and 11.02.2020:

1) ) Replacement of existing PZ1000 relays with new version Numerical Line


of NLDC for DPR is awaited. NIT issued through e-portal on 16.09.2019. Cover-

1 opened on 02.12.2019. Technical evaluation is in progress.

Status informed during Special Meeting held on 03.06.2016:

1. KPTCL informed that the matter had been taken up with concerned Line

Operation and Maintenance wing to carry out corridor clearance and maintenance

as per schedule to avoid frequent line faults in this corridor. A letter had also

been addressed to Chief Engineer, Bhagalkot zone, to ensure lines in & around

Kali complex are maintained in healthy condition. --- Completed

2. KPTCL assurd that the final modified SPS would be implemented at Nagjheri

PH at the earliest. ------ Pending

3. KPCL informed that Nagjhari- Kodasalli Lines 1 & 2 had been kept in service

since 23.05.2016 @ 08.06hrs.

--- Completed


2. Modifications to be carried in Nagzari SPS logic is submitted to

SRLDC/SRPC for verification and approval


1. Will be reviewed in consultation with EE(RT), KPTCL, Hubli.

3. Both the lines are in charged condition.


1) & 3) --- Completed

2). Proposed revision in existing SPS scheme is already submitted to

SRLDC/SRPC., Yet to be discussed and approved by the SRPC forum. --- KPTCL Mail dated 16.12.2017:

1) & 3). --- Completed.


SRLDC/SRPC., yet to be discussed and approved by the SRPC forum ---

PendingKPCL mail dated 16.07.2019:

1 & 3) Completed.




1 & 3) Completed.

2) KPTCL informed that Naghjeri SPS need to be revisited in view of changes in

system configuration. Reply from KPTCL is awaited


1 & 3) Completed.

2. The logic is being reviewed by SRLDC by conducting system studies for the


220kV Nagjheri-Ambewadi line-1 tripped at 13:33

hrs due to B phase to earth fault. Ambewadi was

radially fed from Nagjheri power station through

220kV Nagjheri-Ambewadi line-2. Tripping of this

line caused 220kV Bus shut down at Ambewadi and

remaining lines and transformers were hand tripped

51/I/3


Ambewadi Substation of

KPTCL

220kV lines from Nagjheri power house started

tripping from 11:00 hrs due to fault in lines. The

sequence of tripping is shown in SOE list. At 12:33

hrs, 220kV Narendra-Ambewadi lines-1&2 got

tripped which resulted in loss of evacuation path to

Nagjheri station resulting in tripping of running

Units and complete outage at Nagjhheri power

station. 220kV Ambewadi station also got de-

energized due to tripping of source feeders i.e.

220kV Narendra-Ambewadi-1&2 and 220kV

Nagjheri-Ambewadi-1&2.


Nagjheri power station and

220 kV Ambewadi

substation of KPTCL

49/I/3 29.10.2015 at

14:34 hrs

Pending

1. To avoid tripping of transmission lines on transient faults, KPCL/ KPTCL is

recommended to carry out periodic patrolling of lines, and ensure their proper

maintenance by carrying out jungle/ bushing clearance and trimming of tree

branches within the RoW of transmission lines as per the SRPC transmission

line patrolling guidelines (available under the menu item "All Uploads/

Operation/ Miscellaneous/ Transmission Line Patrolling Protocol / Guidelines

for Southern Region" on SRPC website).

2. KPCL/ KPTCL to review operation of SPS at NPH for functionality

(reduction of generation with tripping of evacuating lines) and healthiness.

3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into service if more than

200 MW generation from Kali Complex (with Nagheri Contribution not less

than 50 MW) is ensured on sustained basis.

PendingKPCL/ KPTCL22-02-2016 at

12:36 hrs

KPCL/ KPTCL1. KPCL to provide A/R on all 220 kV lines emanating from Nagjheri PH.

2. KPTCL to provide A/R on all 220 kV lines emanating from Ambewadi SS.

Annexure-II

Page 24 of 39

KPCL mail dated 23.01.2019 & 23.03.2019:

1) …Completed.

2) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.

3) …Completed.

KPCL mail dated 10.05.2019 & 25.06.2019:

1. & 3. Completed


implementation of SPS at NPH. Reply is awaited.


2. KPTCL informed that Naghjeri SPS need to be revisited in view of changes in

system configuration.

KPCL mail dated 16.07.2019 & 30.10.2019 & 17.12.2019 & 11.02.2020:

1 & 3) Completed.




1. & 3. Completed

2. The logic is being reviewed by SRLDC by conducting system studies for the



Nelamanagala-Mysore line-2

28-09-2019 at 1:38

hr.

Line tripped on operation of over voltage stg-2 protection at

Nelamangala and direct trip received at Mysore

KPTCL to ensure relay pickup to drop off ratio of 0.98 and above for relays configured for

overvoltage protection.


88/II/13 Tripping of 400kV Talaguppa

–Nelamangala line

19-10-2019 at 16:22

Hr.

Line tripped on operation of OV St-1 protection at

Nelamangala end and DT was sent to Talaguppa end.

KPTCL to configure OVR_start in DR or EL and to sort out time synchronization issues between

Talaguppa and Nelamanagala ends.


88/II/14 Tripping of 400/220kV ICT-2 at

Guttur

22-10-2019 at 02:12

Hr.

ICT#2 at Guttur got tripped on operation of Buchholz

protection due to suspected moisture entry during rain.

KPTCL to provide shielding for Buchholz relay to prevent such mal-operations. KPTCL Yet to be informed Pending

89/1/1 Complete loss of supply at 220

kV Hubli SS, 220 kV Bidnal SS

of KPTCL and 220 kV Nagjheri

GS of KPCL

14-12-2019 at 10:56

Hr.

• Triggering incident was fault in 220 kV Hubli-Narendra Line-

2.

• Due to cascaded tripping of connected lines and loss of

evacuation, there was complete loss of supply at:

220 kV Hubli SS &

220 kV Bidnal SS of KPTCL and

220 kV Nagjheri GS of KPCL

i. KPTCL to ensure A/R is in service in all 220 kV lines emanating from 220kV Hubli SS and

220kV Bidnal SS.

ii. KPTCL was requested to ensure proper planning of outages of transmission lines (i.e., outage

planning should be as per N-1 contingency planning and not to cause stress on the system to

avoid complete outages due to fault in the Nagjhari- Hubli corridor.

iii. KPTCL to explore the possibility of split bus operation at 220 kV Hubli SS, in the event of

outage of any of the 220 kV Hubli – Narendra line, to prevent overloading of other line (Narendra

line) and 220kV Bidnal – Narendra line.

iv. KPTCL to submit the SPS for shedding of loads planned at 220kv Hubli SS.

v. KPTCL to expedite finalization of SPS at 220kV Nagjheri SS considering LILO of one circuit

of 220kV Haveri-Narendra line at Bidnal as part of RE evacuation and submit the study to SRPC

and SRLDC for scrutiny/ finalisation.

vi. KPTCL to ensure time synchronization of relays at 220kV Hubli, 220kV Bidnal, 220kV

Soundatti and 220kV Harthi.

vii. KPTCL to explore the possibility of conductor strengthening in Nagjheri – Hubli- Bidnal and

surrounding areas.


1. KPCL to furnish a report on the reasons for Unit-6 tripping at Nagjheri PH.

2. KPCL/ KPTCL to modify suitably the SPS at Nagjheri Power House such that

it would also factor in the over loading of Ambewadi-Narendra lines.

3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into service if more than

200 MW generation from Kali Complex (with Nagheri Contribution not less

than 50 MW) is ensured on sustained basis.


Ambewadi station of

KPTCL and 220kV

Nagjheri of KPCL

18-03-2016 at

14:40 hrs


Modifications to be carried in Nagzari SPS logic is submitted to SRLDC/SRPC

for verification and approval


1. Tripped since there was evacuation problem and there were only two lines NA-

1 and NA-2 ---- Completed

2. Will be reviewed in consultation with EE(RT), KPTCL, Hubli. --- Pending

3. Both the lines are in charged condition. --- Completed.


2. Proposed revision in existing SPS scheme is already submitted to

SRLDC/SRPC., yet to be discussed and approved by the SRPC forum. ---

Pending


1) & 3). --- Completed.


SRLDC/SRPC., yet to be discussed and approved by the SRPC forum ---

Pending


2. The SPS proposed by KPTCL was discussed and the PCSC forum suggested

certain changes for suitable incorporation. KPTCL agreed to look into the same

and assured that the modified SPS would be furnished by January, 2018.


KPTCL informed that Nagjheri SPS shall be finalised in 1 month.

53/I/3 Ambewadi Narendra line-2 tripped on fault and

220kV ambewadi Narendra line-1 tripped due to

over-loading. Running Units at Nagjheri also tripped

during the event due to tripping of evacuating lines

PendingKPCL/ KPTCL

Annexure-II

Page 25 of 39


kV Shimoga SS of KPTCL.

25-12-2019 at 17:44

Hr.

Triggering incident was line to line fault in 220 kV Shimoga-

Sharavathi line -4.

Bus-1 Bus bar protection operated at 220 kV Shimoga

resulting in complete loss of supply since all the elements were

connected to Bus-1 during antecedent conditions.

i. KPTCL to ensure Double Bus operation at 220 kV Shimoga SS to ensure reliability to prevent

complete outage of Substation.

ii. KPTCL, in coordination with KPCL, to enable A/R in 220 kV Shimoga – Sharavathy lines.



Talaguppa of KPTCL

13-12-2019 at 16:27

Hr.

· During replacement of 220 kV faulty relay ICT-1 at

Talaguppa tripped without any relay indication.

KPTCL to instruct substation maintenance personnel to be cautious while carrying out

maintenance activities, so that similar trippings could be avoided.


89/III/1 Tripping of 400kV Kaiga –

Guttur Line-2

11-10-2019 at 08:49

Hr.

And

26-10-2019 at 12:42

Hr.

• Triggering incident was Y phase to Earth fault in the line.

• At Kaiga end, fault was detected in zone-1, A/r operated

successfully.

• At Guttur end, fault was sensed in zone-1 and A/r not

operated.

• Non operation of A/r at Guttur end needs review.

• KPTCL to study the A/R block signal issued due to misinterpretation of single phase fault as

multi phase fault by distance relay (P442) and take suitable remedial actions.


Mail dated 18.07.2019

2) Tender has been lodged two times. New indent was reaised on 06.07.19. and

tender floating is expected by August 2019. 3) Tender has

been lodged on 15.07.19 and new indent would be raised for the same shortly.

TANGEDCO mail dated 17.12.2019 and 12.02.2020:

2) e - tender has been opened on 26.11.19 and placing of purchase order is

expected by January 2020.

3) New Indent was raised on 26.08.19 and procurement is undr progress.

TANGEDCO mail dated 12.02.2020:

2)For busbar protection relays: Placing of purchase order is expected by the end

of this month and delivery period is 80 days from the date of issuing of PO.After

the supplying of materials, the replacement work will be taken up during possible

230kV Bus LC. --Pending

3) For Stanalone Disturbance Recorder: Specification approval has been sought

from our HQ for floating of the tender on 23.12.2019. Again,Reply was sent on

03.02.2020 for the clarification raised by HQ. After obtaing of the approval from

HQ, tender will be floated. - Pending

1. TANGEDCO to replace existing Check-Zone relay with a new one possessing

required performance.

2. TANGEDCO to take steps to provide numerical busbar protection at their 220

kV Tuticorin TPS. TANGEDCO may also explore providing dual CT’s (on

either side) for all B/S breaakers at the time of commissioning of numerical

BBP, if there were no space constraints.

3. TANGEDCO to take steps to provide for standalone Event Logger (EL) and

standalone Disturbance Recorder (DR) with automatic downloading facility to a

centralized server.

Failure of Bus Section-I Y-ph CT resulted in

operation of bus-bar protection for Bus Sections -I &

II. Running Units#1, 4 and 5, 230 kV Kayathar,

230kV Kudankulam, 230kV Sterlite, Station

Transformer-1, 2 & 3 got tripped during the

incident. Unit – 2 & 3 were not in service.

Tamil Nadu

62/II/7 25-01-2017 at

22:36 hrs

Tripping of running Units

& 230kV feeders at

Tuticorin TPS of

TANGEDCO

(Gen Loss: 640 MW)

PendingTANGEDCO mail dated 15.04.2017:

1) New Relay is tested and ready for replacement.Now all 5 units are in

service.The relay will be replaced when lesser units are in service. --- Pending

2.a)Steps are taken to renovate & mordernization of all the control panel into

Numerical based control panels. --- Pending

2.b) Since 230 KV indoor switchyard has no spare space providing dual CT`s is

not fessible. -- Completed

3) Procurement of EL & DR is under progress. --- Pending


1) Check zone New Relay is replaced on 17.04.2017 -- Completed.

2. --- Pending

3. --- Pending


2).P & C wing gives clearance to TTPS to procure the Bus bar protection relays

and protection relays and SER / DR system vide

Lr.CE/P&C/SE/D/EEPC4/AEE3/F.TECH/D.27/17 Dated: 05.10.2017. To get

administrative approval budgetary offer has bar protection relay from various

companies ----Pending

3). SRPC vide Lr: SRPC/SE- III/CEA/2017/6450/DT:27.10.2017 gives features

of SER/DR. Budgetary offer will be called for SER / DR having above features.

---Penidng


2) & 3) The issue was discussed and TANGEDCO was asked to provide time-line

for implementing the recommendations.

Mail dated 29.01.2018:

Procurement work is under progress and will be completed by December 2018.


TANTRANSCO informed that Tender would be floated by January 2019 and

Procurement is expected by APril 2019. Works would be completed by December

2019.


2. Tender issued. Timline- July 2020.

3. Tender has to be issued. Timline- July 2020.

TANGEDCO Status?

Annexure-II

Page 26 of 39

TANTRANSCO Mail received on 19-02-2016 and 24-03-2016:

Revision of Bus Bar Protection setting was carried out. The stabilizing voltage

setting was raised from 410 to 450 volts. After completing the necessary test, the

bus bar protection put in to service on 29.12.2015.

Mail Received on 27-04-2016 ,16-06-2016,25-07-2016 & 24-09-2016:

Revision of Bus Bar Protection setting was carried out. After completing the

necessary test, the bus bar protection put in to service on 29.12.2015.

Mail received on 10-11-2016 & 20.12.2016:

Provision of Bus Coupler bay arrangement was included in the Upgradation

works proposed and the same was sanctioned by MoP through PSDF.

Numerical relay allotted and being commissioned.


Numerical BBP relay was commissioned on 02.02.2017Status received vide mail dated 18-09-2017 & 31-20-2017:

Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus

Coupler bay is arranged and zone segregation will be provided.

Status received vid email dated 12-12-2017:

Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus

Coupler bay has been allotted. Zone segregation will be provided after

commissioning of CT.


TANTRANSCO informed that the recommendation would be complied with by Status received vid email dated 11-12-2018:

Civil work completed & CT will be commissioned after strengthening Bus .2

conductor jumpers.Awaiting Bus LC Time line before January 2019.


Erection under progress will be completed before 31.01.2019


Buscoupler bay will be commissioned by June 2019


Buscoupler bay configuation in BBP will be completed by June 2019. Bus

segregation will be ensured by 31.12.2019 after attending Isolator status

feedback.


Buscoupler bay configuation in BBP will be completed by June 2019. Bus

segregation will be ensured by 31.12.2019 after attending Isolator status

feedback.


Busbar protection with Zone segregation work have been completed . Double bus

operation can be done after strengthening of bus (Twin Moose to Quad Moose).

Time line requested upto 30.06.2020.

Mail recieved on 25-07-2016 & 24-09-2016:

TANTRANSCO: Auto Transformer-2 HV side Bus isolator 'C'-phase support

insulator of 230kV Southern Bus was replaced and Bus Bar Protection scheme

was restored on 12.05.2016.

Status received vide mails received on 10-11-2016 & 20.12.2016 & 12.04.2017

& 01.06.2017 & 15-06-2017 & 04.08.2017 & 18.09.2017:

CT is not available in the Bus Coupler bay for zone segregation. CT latch relay is

to be provided for all bays for zone segregation.

Status received vide mails received on 31-10-2017 & 12-12-2017:

Numerical Bus bar protection panel allotted and will be commissioned with zone TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018:

Numerical Busbar protection relay commissioned on 14.05.2018


Control & Status of isolator feedeback to be provided by replacement of Drive

Mechanism box.



Mechanism box.



Mechanism box. Timeline requested upto Dec 2018.


1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator

status feedback. Work under progress. Lightning mask work under progress will

be completed within three days.


TANTRANSCO informed that Double bus operation would be provided by

March, 2019.


Isolator status will be ensured by March 2019

TANTRANSCO TANTRANSCO to take steps to provide double-bus operation at their 230 kV

Gummidipoondi SS.

50/I/3 Pending

55/I/1

(GD)

Pending

TANTRANSCOTANTRANSCO to examine the feasibility of providing two main-zone operation

for bus bar protection by exploring various alternatives like replacing existing

bus-coupler CB with a hybrid bus-coupler CB that comes with inbuilt CT,

replacing existing BBP relay with another suitable relay that supports two main-

zone operation, and implement the same.

Busbar protection got operated for a fault in 230kV

Mywadi-Anaikadavu line

21-12-2015 at

6:28 hrs


Mywadi station of

TANTRANSCO


Gummidipoondi Station of

TANTRANSCO

12-05-2016 at

12:15 hrs

Flashover of Auto Transformer- 2 HV

B-phase Isolator supporting insulator of 230kV

Southern Bus occurred at Gummidipoondi station.

At the time of fault, Bus bar protection relay was not

in service for pre-commissioning testing of Auto

Transformer-2. All feeders got tripped due to

operation of zone-2 protection from remote ends.

Annexure-II

Page 27 of 39



Hence time line requested upto June.2019.



Hence time line requested uptoSep.2019



Time line requested upto March 2020.

TANTRANSCO TANTRANSCO to take steps to provide double-bus operation at their 230 kV

Gummidipoondi SS.

55/I/1

(GD)

PendingComplete outage of 230 kV

Gummidipoondi Station of

TANTRANSCO

12-05-2016 at

12:15 hrs

Flashover of Auto Transformer- 2 HV

B-phase Isolator supporting insulator of 230kV

Southern Bus occurred at Gummidipoondi station.

At the time of fault, Bus bar protection relay was not

in service for pre-commissioning testing of Auto

Transformer-2. All feeders got tripped due to

operation of zone-2 protection from remote ends.

Annexure-II

Page 28 of 39

The issue was discussed in PCSC-58 meeting held on 18.10.2016, when PCSC

forum agreed to de-link the implementation of the Item from the scope of

Protection Audit Recommendations (PAR), and pursue it as part of PCSC

Recommendations.

Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 &15-

06-2017 & 04.08.2017 & 18.09.2017 & 31-10-2017& 12-12-2017:

Different make Relays will be provided for Main-I & II relays at

Sunguvarchatram end in a phased manner.


TANTRANSCO informed that the recommended works of providing different

make Relays for Main-I & Main-II are targeted to be completed by September,

2018.


provision of Different make Relays for Main-I & Main-II will be completed by

September, 2018.



Sunguvarchatram end in a phased manner. Timeline: September-2018.




TANTRANSCO MAIL DATED 11-12-2018:


Sunguvarchatram end in a phased manner. Timeline: September-2019






Sunguvarchatram end in a phased manner. Timeline: September-2019



Sunguvarchatram end in a phased manner. Timeline: June 2020.

14-09-2016 at

11:13Hrs

Bus Bar Protection (Zone-2) of 230 kV Bus-B got

operated at Alamathy Station during fault in 230 kV

Alamathy-Korattur feeder.

Pending

15-09-2016 at

22:14 hrs


Alamathy Station

TANTRANSCO

58

1. TANTRANSCO to check the healthiness of BBP relay by conducting stability

test, and take appropriate remedial action like increasing voltage settings,

ensuring the healthiness of CT’s, using CT’s with similar characteristics (equal

saturation effects & equal winding resistances) etc. at their 230 kV Alamathy

SS.

2. TANTRANSCO to replace the existing high-impedance BBP relay with its

low-impedance/ numerical variant so as to accommodate variation in CT

characteristics at their 230 kV Alamathy SS.

Different type and Make of distance protection relays to be provided for Main-I & Main-II protection for 230kV feeders at 400 kV Sunguvarchathiram & 230 kV Sunguvarchathiram

Substation [Carry-Over from Protection Audit Recommendations]

Mail received on 10-11-2016 & 20.12.2016:

1. The Bus Bar Protection scheme will be tested for healthiness including the CT

circuits.

2. High impedance BBP relay will be replaced by Numerical relay.

Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 & 15-

06-2017:

1. The Bus Bar Protection scheme was tested for healthiness including the CT

circuits. AREVA make CTs in Alamathy SS are having different kneepoint

voltage for the cores. CT cores of higher knee point voltage has been choosen for

BBP in 230kV Korattur, 230kV OPG-1 & 230kV OPG-2 feeders on 29.11.2016. --

-- Completed.

2. High impedance BBP relay will be replaced by Numerical relay. --- Pending,

Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017 & 12-

12-2017.

1. ---- Completed

2. High impedance BBP relay will be replaced by Numerical relay. --- Pending


2) TANTRANSCO informed that Numerical BBP would be provided by April,

2018 --- Pending

TANTRANSCO mail received on 25-01-2018:

1. --- Complied.

2. High impedance BBP relay will be replaced by Numerical relay. Timeline:

April-2018.

TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018 & 23.07.2018:

2.Numerical BBP relay will be provided. Timeline: Sep-2018.


1. Complied

2.Numerical BBP relay will be provided. Timeline: Sep-2018.

Bus Bar Protection (Zone1) of 230kV Bus-A got


Alamathy-OPG-1 feeder.

TANTRANSCO

Pending

Annexure-II

Page 29 of 39


Numerical BBP relay to procured. Timeline: Sep-2019.


Numerical BBP relay to be procured. Timeline: Sep-2019.


Numerical BBP relay to be procured. Timeline: Sep-2019.


Timeline requested upto July 2020.


Timeline requested upto July 2020.

15-09-2016 at

22:14 hrs


Alamathy Station

TANTRANSCO1. TANTRANSCO to check the healthiness of BBP relay by conducting stability

test, and take appropriate remedial action like increasing voltage settings,

ensuring the healthiness of CT’s, using CT’s with similar characteristics (equal

saturation effects & equal winding resistances) etc. at their 230 kV Alamathy

SS.

2. TANTRANSCO to replace the existing high-impedance BBP relay with its

low-impedance/ numerical variant so as to accommodate variation in CT

characteristics at their 230 kV Alamathy SS.

Bus Bar Protection (Zone1) of 230kV Bus-A got


Alamathy-OPG-1 feeder.

Pending

Annexure-II

Page 30 of 39

64/1/4 Complete outage of North

Chennai TPS STG-1

26-03-2017

at 23:14hrs

Tripping of evacuating lines due to fault led to

tripping of running Unit at NCTPS Stg-1

1. TANTRANSCO to take steps to complete insulator replacement works on the

230 kV lines owned by them in NCTPS area within 6 months.

2. TANTRANSCO to take steps to implement A/R on all 230 kV lines

emanating from NCTPS-I at the earliest.

TANTRANSCO Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017:

1. All the Porcelain insulators were replaced with Polymer insulators in 230kV

NCTPS-I - Tondiarpet feeders - 1 & 2.

---- Completed

2. AR will be implemented on all 230kV lines emanating from NCTPS-I. ---

Pending


1. Completed

2. The scheme needs modification to enable AR, since AR was not envisaged for

this station during commissioning. AR will be implemented on all 230kV lines

emanating from NCTPS-I within six months. --- Pending


2) TANTRANSCO informed that A/R would be implemented on all 230 kV lines

emanating from NCTPS-I by June, 2018.


1. Complied.



emanating from NCTPS-I within six months. Timeline:June-2018.

Pending




emanating from NCTPS-I Timeline:Sep -2018.


1. Complied.



emanating from NCTPS-I Timeline:Sep -2018.


AR implemented for 4 feeders and remaining lines will be provided with AR

subsequently.


1. Complied

2. AR enabled for 3 feeders.


1. Complied

2. AR enabled for 5 feeders.


2. Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem,

Tondiarpet & Alamathy feeder . static relay to be replaced. Timeline - 1 year


Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem,

Tondiarpet & Alamathy feeder . static relay to be replaced. Timeline -Sep 2019


Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem,

Tondiarpet & Alamathy feeder . static relay to be replaced. Timeline -Sep 2019


1. (i). Polymer insulators has been provided in all the 400 kV evacuation lines

from NCTPS end up to 5 KMs. Replacement of Polymer insulator in 230 kV lines

are under progress for the 230 kV lines emanating from NCTPS.

2. Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem,

Tondiarpet & Alamathy feeder . static relay to be replaced. Since the CBs and

the Control & Relay Panels (CRP) are very old and commissioned during 1993.

The Distance relays even though are numerical due to ageing its display and

resetting keys are faulty. Hence it is proposed to replace the CBs & CRPs with

new CBs and Protection relay panel with SAS. A.R will be put into service after

replacing the CB & CRP.

77/II/9 Multiple trippings at

400 kV Manali Substation

TANTRANSCO to refer the issue of selective tripping of 400 kV side breakers,

and non-tripping of 230 kV side breakers due to operation of Densimeters on

low pressure in the instant case to their OEM, and share OEM’s advice/ remedy

in this regard.


OEM will be referred


TANTRANSCO was asked to update the status.

TANTRANSCO MAIL DATED 23.01.2019, 19.03.2019 & 13.06.2019:

The issue was referred with OEM & reply awaited.


OEM reply shall be communicated by end of July 2019


The issue was referred with OEM & reply awaited


The issue was referred with OEM & reply awaited.

Pending

Annexure-II

Page 31 of 39


Thiruvalam Substation

05-10-2018 at

14:32 hrs

Bus-1 got tripped at 230 kV Thiruvalam substation

due to spurious LBB relay (independent) operation

of 230kV Thiruvalam Chittoor line. 230kV

Thiruvalam substation was under single bus

operation; hence operation of LBB protection

resulted in tripping of all connected elements

resulting in the complete outage

TANTRANSCO to take steps to implement multi-bus, multi-zone operation

(Double-bus operation) at their 230 kV Thiruvalam SS by December, 2018.

TANTRANSCO TANTRANSCO MAIL DATED 11-12-2018:

Due to space constraint, the equipments could not be erected.


It was noted that the station was on a single (Main) bus and there was not even

transfer bus. In view of the importance of 230 kV Thiruvalam SS,

TANTRANSCO was asked to take steps to provide dobule-bus operation at their

230 kV Tiruvalam SS.


Feasibility for providing hybrid breaker / shifting of bays will be studied & action

will be taken. Time upto Sep 2019


Bus segregation will be ensured by providing bus coupler bay by extending the


TANTRANSCO MAIL DATED 11.11.2019 and 12.02.2020

Bus segregation will be ensured by providing bus coupler bay by extending the


Pending


1. At present Duobias relay avaiable I/O configuration could not be carried

out.after changing the relay Digital signals will be configured

2.COMPLIED

3.Provision of Numerical BBP relay covered under R&M work. Tender under

progress.

4.out of 30 CTs, 21 No CTs have been replaced with new one.


1. , 3. Timeline requested upto July 2020.

2. Complied

4. Timeline requested upto September 2019.




2.COMPLIED


progress.


TANTRANSCO mail dated 11.11.2019 and 12.02.2020:



2.COMPLIED


progress.


85/II/1 Tripping of 400/230kV

MANALI ICT-3

13-05-2019 at

2:42 hrs

ICT-3 got tripped on the activation of HV REF

protection. During test charging of 110 kV Manali-

ETPS -1 , the 110 kV ETPS -1 got tripped on the

activation of Back up relay and Distance relay failed

to act

1. TANTRANCO is recommended to sort out the malfunctioning of ICT Ref

protection in consultation with OEM and submit a detailed report regarding the

same in 1 month time.

2. TANTRANSCO is recommended to ensure proper labelling of all digital

signals in Disturbance recorders of lines and ICTs at Manali SS.

TANTRANSCO TANTRANSCO mail dated 11.11.2019:

1. The issue was addressed to OEM reply awaited.

2. Uniform Labelling of Digital signal will be ensured.


1. The issue was addressed to OEM reply awaited.

2. Proper labeling of D.R has been implemented.

Pending

87/II/7 Outage of 230 kV Bus-1 at

400/230 kV Madurai station of

TANTRANSCO

19-08-2019 at 12:28

hr.

Triggering incident was jumper cut of 230 kV Madurai-

Ranganathapuram feeder. Bus bar protection of Bus-1

operated resulting in tripping of all elements connected to

230 kV bus-1.

1.TANTRANSCO to submit a report regarding non-operation of A/R at Renganathapuram and to

change the digital signal legend from carrier fail to carrier healthy.

2. TANTRANSCO to configure digital signals corresponding to CB status in DR and sort out time

synchronization issues at 230 kV Checkanurani SS.

TRANTRANSCO TANTRANSCO mail dated 12.02.2020:

1. Complied

2.Complied

Pending Report when sent?

87/II/18 Multiple Tripping at 230kV

Checkanurani S/s of

TANTRANSCO

10-09-2019 at 13:24

hr.

Triggering incident was B phase to Earth fault in 230 kV

Checkanurani - Renganathapuram line. Persistent fault current

resulted in the operation of LBB protection and all the elements

connected at Bus-1 got tripped since 230 kV Checkanurani-

Renganathapuram line was connected at Bus-1 during

antecedent conditions

1.TANTRANSCO to submit a report regarding non-operation of A/R at Renganathapuram and to

change the digital signal legend from carrier fail to carrier healthy.

2.TANTRANSCO to configure digital signals corresponding to CB status in DR and sort out time

synchronization issues at 230 kV Checkanurani SS


1. Complied

2.Complied

Pending Report when sent?

88/II/10 Tripping of Bus-A at 230kV

Alamathy station

13-10-2019 at 11:29

Hr.

· Triggering incident was R-N fault in 230kV Alamathy –

OPG2 feeder.

• Simultaneously jumper got cut in 230kV Alamathy-OPG1

connected to Bus-A.

• Bus bar protection of Bus-A operated.

i. TANTRANSCO to configure DR and EL legends properly and submit a complete DR at

Almathy end clearly showing A/R operation.

ii. TANTRANSCO to ensure time synchronization of relays at Almathy and Almathy_OPG.


CompliedPending Complete DR when submitted?

Failure of ‘R-phase’ HV side Current transformer

(CT) of 315MVA 400/230kV ICT-3 at 400kV

Sriperumbudur substation (400kV TANTRANSCO

switchyard).

28-01-2019

at 01:15 Hrs

PendingTANTRANSCO1) TANTRANSCO to ensure proper legends for DR Digital signals and all

required events(including CB status, Type of protection operated) are captured

in Event logger.

2) TANTRANSCO to extend BBP trip from BusBar relay to 86A (with source-1

DC) in addition to 86B (with source-2 DC), or to provide Common trip relay 96

with redundant DC supply.

3) TANTRANSCO to inform the action plan with timelines for providing

Numerical BBP at Sriperumbdur SS .

4) TANTRANSCO to check the healthiness of all CT’s in the stationand submit

a report regarding the same to SRPC to prevent any such occurrence in future.


Sriperumbudur station

82/I/1

Annexure-II

Page 32 of 39

88/III/2 Tripping of 220kV Idukki –

Udumalpet line

05-10-2019 at 16:35

Hr.

Line tripped on B-N fault. Line tripped at Idukki end on Zone-

1, distance protection and at Udumalpet end on Zone-2. A/R

was attempted at Idukki end but locked out due to persistent

fault. A/R did not operate at Udumalpet end.

For the subject line, the following shall be carried out by KSEBL in coordination with

TANTRANSCO:

i. End-to-end testing for DT/ permissive& other signals may be ensured by testing at both the ends.

ii. Healthiness of PLCC system components (hardware and software) at both the ends shall be

checked and faulty components shall be repaired/ replaced.


Carrier set healthy at Udumelpet end. Healthiness of link will be checked after getting confirmation

from KSEB


PLCC system in IDUD feeder at Idukki is not working well. Purchase process for the new panel is

under progress.It will be commissioned by April 2020.

Pending


Sungavarchatram SS of

TANTRANSCO

28-11-2019 at 10:43

Hr.

• 400 kV SVC SS-ICT2- R phase tripped on percentage

Differential & REF protection.

• During test charging of 110 KV Oragdam-SP Koil-1# at 230

KV Oragadam SS the feeder got tripped on SOTF due to R

phase CT blast.

i. TANTRANSCO to test all CTs (secondary voltage measurement and Tandelta measurement)

and replace if CTs found mal-operating. CT cable also needs to be tested.

ii. TANTRANSCO to furnish the OEM findings regarding the tripping at the earliest .

TANTRANSCO Yet to be informed Pending

Annexure-II

Page 33 of 39

KSEB Mail received vide dated 17.01.2017:

1. 110 kV bus bar protection progressing ----Pending

2. Connection of 220kV earth mat and 110 kV plate earthing system completed.---

- Completed

3. Redundancy of 110V DC system in progress. Complete independent

redundancy is not practical for the time being. 48 V DC redundancy was already

there. ----Pending

4. Instead of stand alone event logger, SCADA system of 110 kV feeder is


1. Detailed engineering of the scheme has been completed. Material procurement

is in progress. ---Pending

2.,3. ---- Completed

4. The SOE and DR are available with time stamping from the numerical relays.

Hence stand alone event logger is not necessary ----- Completed


Work has been already tendered. It is expected that purchase process will

completed within three months.


At the time of bid only one bidder participated and the work has been retendered.


Status as on 18.03.2019: Based on the retender, have received two offers from 1) Status received vide mail dated 03.05.2019:

Sanction to issue purchase order in progress. Time Frame is January 2020 .

Review meeting on 27.06.2019.

1. BBP will be commissioned by December 2019.

2.,3.,4. Completed


1)The station authorities have already initiated action to implement the same by

June 2020.

2.,3.,4. Completed


1)The station authorities have already initiated action to implement the same by

April 2020.

2.,3.,4. Completed


1) Present setting is 180ms.OEM(ABB) suggests that it will give around 200ms

delay as it is having inherent delay is of around 20ms(ie, 180ms +20ms

=200ms).With this setting the fault clearence is found after 220ms.So further

revision may be carried out after discussion.

2)Breaker status will be ready only after completing the GOOSE network as part

of renovation of all feeder panels and Idukki first stage units by June 2019 .


1) Pending.....


of renovation of all feeder panels and Idukki first stage units by January 2020

....Pending


1. 2. work under progress


1. As recommended, LBB time setting is changed to 200ms on 22.10.2019

Triggering incident was conductor snapping in 110

kV Kalamassery- Kaloor feeder

1). KSEBL to check & correct the LBB time setting employed at their Idukki PH

to 200 msec.

2). KSEBL o ensure that DR’s & EL’s of all Protection Relays (PR’s) at their

Idukki PH are configured for recording all mandated protections & signals.

Triggering incident was R-Ph fault in 220kV Idukki-

Kalamassery line-2. R-phase pole of breaker didn’t

open at Idukki end. LBB of Bus-2 operated resulting

in tripping of all connected elements along with

running Unit#4 at Idukki and 50MVA station

transformer. At the same time, 220kV Idukki

Kalamassery line-1 also got tripped at Idukki end.

Subsequently running Units 1 and 2 also tripped on

Governor oil Low Pressure due to loss of AC supply.

This resulted in complete outage of Idukki PS.

01-10-2018 at

04:16 hrs

Complete Outage of 220 kV

Idukki Power Station

79/I/1

KSEB to take steps to provide the following at their 220/ 110 kV Kalamassery

SS:

1. Busbar protection at 110 kV level

2. Connecting 220 kV and 110 kV sides on to a common earthmat

3. Redundant DC supply for both protection (220 V) and communication (48 V)

applications

4. Stand-alone Event Logger

KSEB Pending

PED

KSEBL Pending

23-08-2016

at 11:20 hrs


Kalamassery Substation

Kerala

58/I/1

(GD)

Annexure-II

Page 34 of 39

KSEBL mail dated 15.01.2020

1. Completed


of renovation of all feeder panels and Idukki first stage units by March 2020 ---

Pending


1) Completed


of renovation of all feeder panels and Idukki first stage units by June 2020.

Multiple trippings at 220

kV Madakathra station


In progress


Status as on 18.03.2019: Estimate sanctioned by CE(Transmission North ) and

have prepared the technical specifications.Tendering procedures are yet to get

started.


At the time of bid only one bidder participitated and the work has been

retendered.


Retendering process in progress. Time Frame is January 2020 .


work has been awarded


Drawing varification is under progress.Work will be completed by the end of

March 2020


Work will be completed by the end of June 2020


Bhramapuram substation of

KSEB

08-02-2019 at

10:28 hrs

Complete outage of 220kV Brahmapuram SS

occurred due to suspected mal operation of Bus Bar

protection.

1) KSEBL to furnish detailed report regarding the healthiness of BBP operation

at 220kV Brahmapuram after testing of the same on 12th April 2019.

2) KSEBL to submit the action plan regarding

(i) Replacing of the Static High impedance BBP (using CRM relays) with

Numerical BBP.

(ii) Replacement of CRM relays and relays with no Disturbance recording

facilitites.

KSEBL Status received vide mail dated 03.05.2019 & 11.202.2020:

1) Detailed report sent on 02.05.2019…..Completed.

2) As reported earlier in this regard, the permanent solution to this problem is to

replace the existing high impedance static relay with a low impedance numerical

relay. The station authorities have already initiated action to implement the same

by June 2020.

Pending


Edamon SS of KSEB

27-05-2019 at

12:30 hr.

Triggering incident was three phase to earth fault in

220 kV Edamon Bus 1 and 2. Bus 1 and 2 Bus bar

protection operated resulting in the tripping of all

connected elements.

1.KSEBL may develop proper operational code for procedures to be followed

while performing operations in switchyard and sensitize their operators to reduce

operational errors. 2.ksEBL to ensure time synchronization of relays at

220 kV Edamon SS.

KSEBL KSEBL mail dated 30.07.2019:

1. proper operrational code is avilalable in 220kV SS Edamon

2. All 220KV relays of Edamon substation are synchronized with GPS clock . Out

of this, 3 relays are having hardware issues with time synchronisation switch .

This problem will be resolved by August 2019 itself.

KSEBL mail dated 28.08.2019

2. By August 2019, could rectify the hardware issue with 2 relays. Other will be

done by September 2019.


Have taken steps to rectify the hardware issue with the 3rd relay and will be

completed by end of December 2019



completed by end of March 2020



completed by end of April 2020

Pending

87/II/14 Tripping of 400/220 kV

ICT-3 at Trichur

29-08-2019 at

16:32 hr

ICT-3 got tripped during testing of busbar protection KSEBL to submit a report after providing separate breaker failure relays for

ICT-3 and sorting out the time synchronization issues of relays at 400 kV

Madakkathara SS.


1) Relay purchase is expected to be completed by Feb 2020. Report will be

complted by March 2020.

2) GPS connection issues were resolved


1)Work will be completed by the end of June 2020

2) completed.

Pending

88/II/1 Complete loss of supply at 220kV

Idukki GS of KSEB

03-11-2019 at 15:05

Hr.

Triggering incident was bus fault at Bus-2 of 220kV Idukki

station.

• This led to operation of bus bar protection at Idukki resulting

in complete loss of supply at Idukki station.

1. KSEBL to submit a report after detailed inspection of Busbar relay regarding reason for

operation of checkzone during through fault.

2. KSEBL to ensure equal distribution of feeders on both buses to reduce supply interruption in

case of BBP operation of one Bus.

3. KSEBL to rectify time sync issue at 220kV Idukki GS.


1)It was noticed that Bus coupler CT input was wrongly connected to bus bar protection. Rectified

the maloperation issues.Disconnected Bus coupler CT input to Busbar protection.Now working Ok.

-- Completed 2) Instructions have already been conveyed

for equal distribution of feeders and generators in both buses. -- Completed

3)Time suncronization will be rectified after RMU of Idukki feeders & 1st stage generatos by June

2020. --Pending

Pending

PendingKSEBLKSEBL to take steps to replace the existing static (high impedance type) 220 kV

BBP with numerical Busbar protection at their 220 kV Madakathara SS.

Triggering incident was Y-phase to ground fault in

220kV Madakathra – Palakkad_KL (Ellapully) line

due to flashover of pilot insulator string. Auto-

reclose was successful at Madakathra end. At the

same time bus differential relay Zone-C mal-

operated resulting in tripping of all elements

connected to the bus.

15-10-2018 at

08:57 Hrs

80/II/5

1). KSEBL to check & correct the LBB time setting employed at their Idukki PH

to 200 msec.

2). KSEBL o ensure that DR’s & EL’s of all Protection Relays (PR’s) at their

Idukki PH are configured for recording all mandated protections & signals.

Triggering incident was R-Ph fault in 220kV Idukki-

Kalamassery line-2. R-phase pole of breaker didn’t

open at Idukki end. LBB of Bus-2 operated resulting

in tripping of all connected elements along with

running Unit#4 at Idukki and 50MVA station

transformer. At the same time, 220kV Idukki

Kalamassery line-1 also got tripped at Idukki end.

Subsequently running Units 1 and 2 also tripped on

Governor oil Low Pressure due to loss of AC supply.

This resulted in complete outage of Idukki PS.

01-10-2018 at

04:16 hrs

Complete Outage of 220 kV

Idukki Power Station

79/I/1 KSEBL Pending

Annexure-II

Page 35 of 39


kV Kanhirode, 220 kV

Ambalathara, 220 kV Mylatty,

220 kV Thaliparamba and 220

kV Orkattery SS of KSEB

08-01-2020 at 14:22

Hr.

• Triggering incident was conductor snapping of 220 kV

Kanhirode – Ambalathara feeder.

• Bus bar protection at 220 kV Kanhirode SS operated resulting

in tripping of all connected elements.

• There was complete loss of supply at 220 kV Ambalathara,

Mylatty, Thaliparamba and Orkattery SS of KSEB since these

station were radially fed from 220 kV Kanhirode station.

KSEBL to replace existing high impedance BBP and mal-operating check Zone relay with Low

impedance BBP at 220kV Kanhirode SS.KSEBL Yet to be informed Pending

89/II/1 Tripping of Bus-1 and Bus-2 at

220 kV Brahmapuram station of

KSEB

26-11-2019 at 09:04

Hr.

• Bus bar protection of Bus-1 operated resulting in tripping of

all elements connected to Bus-1 at 220 kV Brahmapuram.

KSEBL to expedite the process of providing numerical BBP in place of mal-operating CRM

relays at 220 kV Brahmapuram SS.KSEBL Yet to be informed Pending

85/II/16 Tripping of 400kV Tumkur-

Bidadi line-1&2, 400kV

Tumkur-Cuddapah line-2,

400kV Tumkur-Pavagada

line-2

29-05-2019 at

6:11 hrs

Lines tripped due to Y-N & Y-B phase to earth fault PGCIL (SR-2) is recommended to submit Equipment failure report to CEA

regarding the failed LA.

PGCIL (SR-II) Yet to be informed Pending

84/II/15 Tripping of 400kV Bus-1

and connected elements at

400kV Bidadi substation

25-04-2019 at 08:01 hr.Triggering incident was failure of R-ph CB of bus

reactor at 400kV Bidadi. Bus bar protection of Bus-

1 operated resulting in the tripping of all elements

connected to Bus-1

1. PGCIL (SR-II) was requested to send the equipment failure report to CEA.

2.PGCIL (SR-II) is recommended to share the feedback of OEM regarding

decomposition of SF6 gas.

PGCIL (SR-II) PGCIL (SR-2) mail dated 16.12.2019:

Report from OEM is yet to be received.

Pending

88/II/11 Tripping of 400kV Ramagundam-

N’Sagar-1

16-10-2019 at 02:56

Hr.

· Line tripped on operation of OV St-1 protection at N'Sagar

end and DT was received at Ramagundam end.

• From DR of N'Sagar end, Vb-254kV.

• Tripping is not as per OV grading at N'Sagar end.

1. PGCIL-SR-1 to submit Event logger for the incidence clearly showing OVR_start and

OVR_trip.

2. PGCIL-SR-1 to check the OVR gradings adopted at 400kV N’Sagar SS.

PGCIL-SR-I Yet to be informed Pending

Others

PGCIL (SR-I) & PGCIL (SR-II)

Annexure-II

Page 36 of 39


TPCIL station

25-10-2017 at

19:33 hrs

400 kV TPCIL-Nellore PS line-1 got tripped from

TPCIL end during fault in 400kV Nellore-Nellore

PS line-2. Running units at TPCIL got tripped due

to loss of evacuating line. 400kV Nellore PG -

Nellore PS line-2 and 400kV TPCIL - Nellore PS

line-1 were under shutdown.

TPCIL to configure DEF protection such that it remains in blocked condition as

long as Distance Protection is active, and becomes active only when distance

protection does not pickup.

TPCIL Review Meeting on 21.12.2018:

It was noted that no TPCIL representatives had come to attend the meeting

Review meetinmg on 27.06.2019:

No representative from the utility attended meeting and it is requested to submit

status regrading the recommendation at athe earliest.

Pending

1.MAPS to furnish a detailed report on the tripping of SP Koil – MAPS lines 1

& 2 at MAPS end with focus on the correctness of the settings of Main-I & Main-

II relays (for primary & back-up protections) on both the lines.

2.MAPS to take steps to provide down-loading facility for DR & EL from Main-I

& Main-II relays on all 230 kV lines emanating from MAPS.

Status revided vide MAPS mail dated 06.12.2016;

1. The settings given by M/s TANTRANSCO were adopted for Main –I & Main-

II relays for both the lines. The same settings were verified to be same.

Subsequently calibrated was done and no drift was observed. --- Completed

2. From May 2016 onwards, the DR, EL and trip report are being sent by mail to

SRLDC, Bengaluru by MAPS. --- Completed

B-phase CT failure occurred in 230 kV S.P.Koil -

MAPS line-1. Busbar protection got operated at

SP.Koil station. All elements except 230kV

Oragadam and 230kV Kalivandapattu got tripped at

230kV S.P.Koil station. ‘Y’ phase CT and support

insulators also got damaged.


S.P.Koil Station of

TANTRANSCO

PendingNPCIL (MAPS)02-04-2016 at

17:08 hrs

Annexure-II

Page 37 of 39

78/II/2 Tripping of 400 kV Neyveli

TS2Exp -Pugalur line

01-08-2018

at 11:56 hrs

Triggering incident was failure of R-ph tension

insulator string/ flashover in 400 kV Bus-1 at NLC

TS2Exp end. Busbar protection had operated

resulting in tripping of all main breakers connected

to 400kV Bus-1 at Neyveli TS2 Exp. In 400kV NLC

TS2Exp - Pugalur line, fault was sensed in Zone-1,

R-N at Pugalur end resulting in a single phase trip.

Direct Trip was received at Pugalur end due to

operation of over voltage Stg-2 at NLC TS2Exp.

1. NLCIL to furnish a report along with a suitable SLD on the tripping event

explaining the observed discrepancies [DPR, Z1 operation, instantaneous

operation of OVR-II operation], and remedial action taken to attend the same.

2. NLCIL to configure DR’s & EL’s of all protection relays at their NLC TS-

IIExp station for all mandated protections & signals.

NLCIL Review Meeting on 21.12.2018:

NLCIL was asked to furnish the status of implementation of the recommendation





Pending

79/II/8 Tripping of 400 kV NLC

TS-2 (Exp) – Pugalur line

10-09-2018 at

20:57 hrs

Line tripped on B-N fault. Auto-reclose was not

attempted at Pugalur end due to DT receipt from

NLC TS2Exp end. At NLC TS2Exp end, V>2 trip

was observed in DR. Analog voltages recorded in

DR were observed to be less than that required for

O/V Stage-II operation.

NLCIL to furnish a detailed report on tripping event explaining the observed

discrepancies , and proper reasons for tripping of the line considering both the

Main-relays including remedial action taken w.r.t. healthiness/ replacement of

Main protection relays on 400 kV NLC TS2Exp–Pugalur line.

NLCIL Review Meeting on 21.12.2018:

NLCIL was asked to furnish the status of implementation of the recommendation



it is requested to submit status regrading the recommendation at athe earliest.

Pending

80/II/17 Tripping of 400 kV Nellore

PS – SGPL line-1

14-11-2018 at

20:20 hrs

Y- ph to earth fault occurred in line due to snapping

of GIS to Air bushing conductor at SGPL

switchyard. The conductor got grounded such that

the fault was being fed by NPS bus and there was

earth fault and broken conductor start at SGPL end.

NPS end got tripped in Zone-2 due to non-receipt of

carrier resulting in a 3-ph trip at NPS. After 500ms,

earth fault occurred at SGPL end resulting in Zone-1

operation and 3 phase trip. A/R was not attempted

at SGPL end

SGPL to examine the reasons for no-operation / failure of Auto-reclosure from

their end for the subject tripping, and furnish an action taken report detailing

remedial measures taken to PCSC forum.

SGPL Review meetinmg on 27.06.2019:



Pending


Neyvelli TS2 (Exp) -

Pugalur line

07-11-2018 at

05:50 Hrs

400 kV Neyvelli TS2Exp - Pugalur tripped on

B-phase to ground fault due to DPR, Z1 operation.

Auto-reclose was successful at Pugalur end and the

line tripped at Neyveli TS2Exp end only. Auto-

NLCIL to furnish a detailed report on the reasons for A/R non-operation for the

subject tripping at their NLCTS2Exp station including remedial measures taken

to PCSC forum.

NLCIL Review meetinmg on 27.06.2019:



Pending


Kayamkulam –Punnapura-2

24-02-2019 at

03:05hrs

Line tripped on B-phase to earth fault. Auto-reclose

was successful at Punnapura. A/r was not attempted

at Kayamkulam and there was pole discrepancy

operation resulting in tripping of R and Y pole of

CB.

It was noted that no representative of NTPC attended the meeting.

NTPC (Kayamkulam) to furnish detailed report regarding failure of Auto-

reclosure at Kayamkulam end for Kayamkulam –Punnapura line-2.

NTPC (KYKLM) Review meeting on 27.06.2019:




Trip report for Tripping of 220 kV Kayamkulam –Punnapura-2 submitted , but

for submitting detailed report for Auto-reclosure at Kayamkulam end not

operating for Kayamkulam –Punnapura line-2 , half day shutdown of

Pending


Kayamkulam –Punnapura-2

05-03-2019 at

00:30hrs

220kV Kayamkulam-Punnapura -2 tripped on Zone-

1 distance protection due to R-N fault. Auto reclose

operated and successful at Punnapara end but didnot

operate at Kayamkulam end.

It was noted that no representative of NTPC attended the meeting.

NTPC (Kayamkulam) to furnish detailed report regarding failure of Auto-

reclosure at Kayamkulam end for Kayamkulam –Punnapura line-2.

NTPC (KYKLM) Review meeting on 27.06.2019:




Trip report for Tripping of 220 kV Kayamkulam –Punnapura-2 submitted , but

for submitting detailed report for Auto-reclosure at Kayamkulam end not

operating for Kayamkulam –Punnapura line-2 , half day shutdown of

Kayamkulam –Punnapura line is required to check reason for failure . May please

approve half day outage of Kayamkulam –Punnapura line and intimate us atleast

Pending


NLC1

Expansion(NLC1EXP)

05-06-2019at 18:51 hr.Triggering incident was failure of Y-phase CT of GT-1 (Generator Transformer) at 400kV NLC1EXP. Bus-1 Bus bar protection operated resulting in the tripping of NLC1EXP U#1 and 400kV NLC1EXP- Nagapattinam line 1. NLCIL to check the healthiness of R & B ph CT of Unit-1 at NLC TS1(Exp)

and if found unhealthy replace the same alongwith replacement of Y-ph CT. CT

replacement plan and timeframe shall be informed to SRPC.

2.NLCIL in coordination with PGCIL(SR-II) to resolve the time syncronisation

issues in 230kV NLC TS1(Exp) – Nagapattinam line.

3. NLCIL was also requested to investigate the reason of unwarranted DT sent to

NLC TS1 (Exp) end from NLC TS2 end and resolve the same.

NLCIL NLCIL mail dated 09.07.2019:

AT TS2 Side Siemens 7SA52 & Micromho relay are used for distance protection.

During the incident Micromho has sensed the CT blast as a Zone-1 fault and

tripped the feeder. Adt signal was send to TS1 Exp end. The relay will be tested

during the next shut down.

NLCIL mail dated 11.01.2020:

3. Michro mho Relay Testing was carried out at TS2 end on 15/11/19 and found

the relay was normal.Proposal has already been initiated to replace distance

relays with line differential relays. It is also proposed to replace the PLCC panels

at both ends. -- Completed

Pending

85/II/19 Tripping of 400kV JSW-

Guttur line

02-06-2019 at

18:17 hrs

Line tripped due to OV St-1 protection operation at

JSW end and DT was sent to Guttur end. At Guttur

end B ph voltage was observed to be lesser

comparing to R ph and Y ph(Vr-249kV, Vy-255kV

and Vb-230kV).

JSWEL is recommended to monitor the B-ph CVT of 400kV JSWEL-Guttur

line (due to lower B-ph voltage compared to other two phases). The same shall

be replaced if the issue persists.

JSWEL Yet to be informed Pending

85/II/21 Tripping of 400kV JSW -

Guttur line and 400 kV

Kaiga - Guttur line-2

05-06-2019 at

18:27 hrs

Y-phase to earth fault occurred in 400kV Kaiga-

Guttur line-2. A/r was successful at Guttur end. At

Kaiga end A/r was not attempted and breakers got

tripped due to operation of Pole discrepancy (1.65

Sec). 400kV JSW-Guttur line tripped on operation

of over-voltage at Guttur and direct trip was

received at JSW. From DR of Guttur, it is observed

that there was swell in R & Y phase voltage for few

cycles

1. NPCIL (KGS) is recommended to identify the issue related to unsuccessful

A/R attempt of 400kV Kaiga – Guttur line and non-opening of R-pole CB. It is

recommended to check the healthiness of all breakers including breaker timing.

2. Time synchronization of DR and EL at Kaiga end shall be ensured.

NPCIL (KGS) NPCIL mail dated 13.12.2019:

During the event Distance Protection Main-2 detected Y-ph fault and opened the

Y-ph pole and initiated A/R to process.

subsequent to that IN> started for B-ph. Actuation of IN> during the dead time

leads to A/R lockout. So pole discrepancy operated at kaiga end as per the

scheme.

DR and EL are already GPS synched at Kaiga end.

NPCIL mail dated 18.03.2020:

Event is forwarded for Designer review

Pending

85/IV/7 Tripping of 400kV

Ramadugu-Singareni line

11-06-2019 at

08:24 hrs

Line tripped due to Direct Trip receive at Ramadugu

end

Singareni STPP is recommended to submit a detailed report regarding sending

of DT from singareni end that resulted in tripping of 400kV Ramadugu-

Singareni line.

Singareni TPP Yet to be informed Pending

Annexure-II

Page 38 of 39

86/III/2 Tripping of Kaiga-Gutur

line -2

22-07-2019 at

17:47hr.

Line tripped on B-phase to earth fault. Line did not

auto-reclose.

NPCIL (KGS) to ensure time sync between DR and EL at Kaiga end. NPCIL NPCIL mail dated 13.12.2019:

DR and EL are already GPS synched at Kaiga end.

During the event Auto reclose was successful from KGS end. Due to existence of

fault on B-phase, within 9 mili sec of closure, line CB-2B again tripped. As per

information from Guttur end, insulator flash over took place at tower No:103.

Pending

87/III/4 Tripping of 400 kV Kaiga-

Narendra line-2

06-09-2019 at 4:33

hr.

Line tripped on Zone-1 distance protection operation due to R-

phase to Y phase fault. At Kaiga end line auto-reclosed.

NPCIL (KGS) to review A/R scheme at Kaiga GS. As per A/R logic, any phase to earth fault

detection should lead to opening of the faulted phase and reclosing after dead time. But during

dead time if any subsequent fault occurs it should block A/R and 3-ph trip should be extended.

NLCIL (KGS) NPCIL mail dated 13.12.2019:

Distance protection of Main-2 detected R-ph fault and opened the R-ph pole, initiated A/R to

process.Subsequent to that Y-ph fault detected by Main-1 distance protection within 71 m.sec of

Rph fault and opened the Yph-pole.

Since Y-pole opened within the dead time and main-2 relay extended the close command to both

the pole after laps of dead time as per scheme

Pending

88/III/7 Tripping of 400kV NLC TS-2

Exp- Pugalur line

29-10-2019 at 16:43

hr.

Triggering incident was Y phase to Earth fault in the line. At

Pugalur end, fault was detected in Zone-1 and A/R operated

successfully. At Neyveli TS-2 Exp end, fault was detected in

Zone-1 and A/R not operated.

NLCIL to submit a detailed report regarding the reason for failure of A/R in consultation with

OEM.

NLCIL Yet to be informed Pending

Annexure-II

Page 39 of 39

Sl.No. Element Name Outage date/time Revival date/time Reason for outage Sender/ Receiver Remedial Measures/ Actions taken Remarks

1400KV-NELAMANGALA-TALGUPPA-1 08-09-2019/11:50:00 DISTANCE PROTECTION KPTCL To-be-discussed

2400KV-NELAMANGALA-TALGUPPA-1 19-09-2019/09:04:00 DISTANCE PROTECTION KPTCL To-be-discussed

3220KV-AMBEWADI-XELDEM 24-09-2019/16:59:00 TRIPPED ON C-N FAULT KPTCL/ GED To-be-discussed

4220KV-AMBEWADI-XELDEM 25-09-2019/17:17:00 TRIPPED ON B-N FAULT KPTCL/ GED To-be-discussed

5220KV-AMBEWADI-XELDEM 29-09-2019/13:57:00

TRIPPED DUE TO B-N LINE

FAULTKPTCL/ GED To-be-discussed

6400KV/220KV GUTTUR-ICT-2 04-10-2019/12:27:00 04-10-2019/13:02:00

DIFFERENTIAL PROTECTION

ACTEDKPTCL To-be-discussed

7400KV-BTPS-HIRIYUR-2 11-10-2019/01:47:00 phase to phase fault KPCL/ PGCIL (SR-2) Line owned and maintained by KPTCL

8

220KV-SRISAILAM_RIGHT_BANK-

NAGARJUNSAGAR12-10-2019/12:32:00 12-10-2019/13:14:00 DISTANCE PROTECTION APGENCO/ PGCIL (SR-1) To-be-discussed

9

132KV-KONAJE-MANJESWAR-1 15-10-2019/13:30:00 15-10-2019/14:02:00 DISTANCE PROTECTION KPTCL/ KSEBL

KSEBL: Feeder not tripped at Manjeshwaram

110kV ss.Feeder tripped at Konaji end with

distance protection (Distance 12.63 km from

Konaje end)

10220KV-AMBEWADI-PONDA-2 17-10-2019/14:11:00 TRIPPED ON B-N FAULT KPTCL/ GED To-be-discussed

11400KV-NELAMANGALA-TALGUPPA-1 17-10-2019/18:35:00 TRIPPED ON R-N FAULT KPTCL To-be-discussed

12220KV-KOTHAGUDEM_TPS_V-LOWER_SILE .. 18-10-2019/11:39:00 18-10-2019/12:16:00 TRIPPED ON B-N FAULT TSGENCO/ APGENCO Line not tripped at KTPS end

13220KV-REGULAPADU-ALIPUR-1 29-10-2019/14:02:00 29-10-2019/14:23:00

TRIPPED ON RELAY MAL

OPERATIONAPTRANSCO/ KPTCL

APTRANSCO: Feeder not tripped at Regulapadu

end.

14400KV/230KV NNTPP-ICT-2 29-10-2019/12:24:00 29-10-2019/18:04:00

PRESSURE RELIEF DEVICE

OPERATEDNLCIL To-be-discussed

15220KV-AMBEWADI-PONDA-2 31-10-2019/10:34:00 31-10-2019/12:20:00


FAULTKPTCL/ GED To-be-discussed

16


NAGARJUNASAGAR TS04-11-2019/16:34:00 14-11-2019/18:18:00


FAULTAPGENCO/ TSGENCO To-be-discussed

17HVDC 500KV KOLAR_DC Pole 05-11-2019/10:55:00 05-11-2019/13:22:00 ESOF PGCIL (Sr-2) To-be-discussed

18220KV-KOTHAGUDEM_TPS_V-LOWER_SILE .. 05-11-2019/12:13:00 25-11-2019/12:52:00


FAULTTSGENCO/ APGENCO TSGENCO: Line not tripped at our end.

19400KV-KALVENDAPATTU-PUGALUR-2 07-11-2019/12:21:00 07-11-2019/19:55:00 TRIPPED ON B-N FAULT PGCIL (Sr-2)/ TANTRANSCO Line owned and maintained by TANTRANSCO

20220KV-KAIGA-KODASALLY-1 07-11-2019/13:39:00 TRIPPED ON LA BLAST NPCIL (KGS)/ KPTCL To-be-discussed

21220KV-KOTHAGUDEM_TPS_V-LOWER_SILE .. 10-11-2019/10:26:00 TRIPPED ON R-N FAULT TSGENCo/ APGENCO

TSGENCO: KTPS-V to Lower Sileru Feeder not

tripped at KTPS end

22400KV-NELAMANGALA-TALGUPPA-1 11-11-2019/13:09:00 TRIPPED ON R-N FAULT KPTCL To-be-discussed

23400KV-KALVENDAPATTU-VALLUR-1 25-11-2019/12:34:00 25-11-2019/14:29:00 Earth Fault PGCIl (Sr-2)/ NTECL To-be-discussed

Pending Remedial Measures/ Actions taken for the Critical Tripping Incidents (as on 01.05.2020)

Annexure-III

Page 1 of 11

24400KV/220KV TALGUPPA-ICT-2 26-11-2019/21:58:00

Tripped due to Non

availability of TBKPTCL To-be-discussed

25

400KV-SRISAILAM_LEFT_BANK-SATTENPALLI 28-11-2019/09:52:00 28-11-2019/10:44:00 B PHASE TO GROUND TSGENCO/ APTRANSCO

APTRANSCO:Test charged and feeder stood ok.

Status of A/R?

26220KV-AMBEWADI-PONDA-1 04-12-2019/08:23:00

TRIPPED ON SINGLE PHASE

TO GND FAULTKPTCL/ GED To-be-discussed


Tripped due to Non

availability of TBKPTCL To-be-discussed

28


Tripped during hand tripping

of Nelamangala- talaguppa

line

KPTCL To-be-discussed

29220KV-SEDAM-TANDUR-1 08-12-2019/01:38:00 08-12-2019/02:01:00 TRIPPED ON Y-N FAULT KPTCL To-be-discussed

30 400KV-KOLAR_AC-THIRUVALAM-1 28-12-2019/14:10 28-12-2019/19:29 TRIPPED ON Y-N FAULT PGCIL (SR-2)/ PGCIL (SR-1) Fault in SR-I portion of the line.

31 400KV-KOLAR_AC-THIRUVALAM-1 28-12-2019/13:25 28-12-2019/13:58 Y-PHASE FAULT PGCIL (SR-2)/ PGCIL (SR-1) Fault in SR-I portion of the line.

32 220KV-AMBEWADI-XELDEM 30-12-2019/22:22 TRIPPED ON B-N FAULT KPTCL To-be-discussed

33 400KV-GAZUWAKA-VEMAGIRI_PG-1 03-01-2020/10:51 03-01-2020/11:30 TRIPPED ON Y-N FAULT PGCIL (Sr-1) To-be-discussed

34

220KV-AMBEWADI-XELDEM 07-01-2020/12:27 07-01-2020/20:11

H/T due to heavy spark was

observed in Rph limb of the

CB


35 765KV-SRIKAKULAM-ANGUL-1 08-01-2020/15:17 08-01-2020/16:33 tripped on R-B fault PGCIL (SR-1) To-be-discussed

36 400KV-NELAMANGALA-TALGUPPA-1 08-01-2020/21:24 TRIPPED ON R-N FAULT KPTCL To-be-discussed

37220KV-REGULAPADU-ALIPUR-1 10-01-2020/03:32 10-01-2020/01:57 110KV SIDE PROBLEM APTRANSCO/ KPTCL APTRANSCO: Feeder not tripped at this end.

38

220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 10-01-2020/14:38 10-01-2020/14:56TRIPPED ON SINGLE

PHASE TO GND FAULTTSGENCO/ APGENCO

TSGENCO: On 10.01.2020 at 14:38 hrs 220KV

KTPS-Lower Sileru1 Feeder was tripped on C

Phase to Ground fault at a distance of 64.64Kms.

After getting clearance from SLDC, line charged

at 14:56 Hrs. Line stood ok.

39 400KV/230KV NTPL-ICT-1 12-01-2020/16:45 12-01-2020/17:56 tripped due to SF6 low NTPL To-be-discussed

40 400KV-NELAMANGALA-HASSAN-1 12-01-2020/06:39 12-01-2020/17:34 TRIPPED ON R-N FAULT KPTCL/ PGCIL (SR-2) To-be-discussed

41400KV-VTPS_IV-SURYAPET-1 12-01-2020/13:58 12-01-2020/15:19 TRIPPED ON B-N FAULT APGENCO/ TSTRANSCO

Fault not in TSTRANSCO jurisdiction. Tree

clearance was done at APTRANSO end.

42 400KV-NELAMANGALA-TALGUPPA-1 12-01-2020/17:15 distance protection KPTCL Fault in KPTCL portion of the line.

43400KV-SIMHADRI_STG2-VEMAGIRI_AP-1 14-01-2020/14:29 14-01-2020/16:12 TRIPPED ON R-N FAULT NTPC(SHM)/ APTRANSCO APTRANSCO:Test charged and feeder stood ok.

44400KV-VEMAGIRI_AP-SATTENPALLY-1 14-01-2020/14:29 14-01-2020/15:21 TRIPPED ON R-N FAULT APTRANSCO APTRANSCO:Test charged and feeder stood ok.

45220KV-REGULAPADU-ALIPUR-1 16-01-2020/13:48 17-01-2020/02:34 RELAY MALOPERATION APTRANSCO/ KPTCL APTRANSCO: Feeder not tripped at this end.

46 400KVNELAMANGALA - HASSAN 21-01-2020/16:32 Tripped on R-N fault KPTCL/ PGCIL (SR-2) Fault in KPTCL portion of the line.

47400KV CHITTOOR KRISHNAPATTANAM 22-01-2020/12:24 22-01-2020/14:49 Tripped on B-N fault APTRANSCO/ APGENCO APTRANSCO:Test charged and feeder stood ok.

48400KV-VIJAYAWADA-NELLORE_AP-1 26-01-2020/13:14 26-01-2020/16:23 Tripped on Y-B Fault APTRANSCO/ PGCIL (SR-1)

APTRANSCO:FAULT not in APTRANSCO

jurisdiction.

49 400KV/110KV KAMUDHI-ICT-3 27-01-2020/14:44 27-01-2020/16:08 LV B-Ph isolator Problem TANTRANSCO To-be-discussed

50 400KV/110KV KAMUDHI-ICT-4 27-01-2020/14:44 28-01-2020/01:32 LV B-Ph isolator Problem TANTRANSCO To-be-discussed

51 HVDC 500KV BHADRAVTAHI Pole 2 27-01-2020/09:34 27-01-2020/14:40 THYRISTOR FAILURE PGCIL (Sr-2) To-be-discussed

Annexure-III

Page 2 of 11

52400KV-HINDUJA-KV_KOTA-2 27-01-2020/08:52 27-01-2020/13:38

TRIPPED ON SINGLE

PHASE TO GND FAULTHNPCL/ APTRANSCO

APTRANSCO:Patrolling done and no visible fault

found.

53765KV-CUDDAPAH-THIRUVALAM-2 28-01-2020/15:21 28-01-2020/16:13

TRIPPED DUE TO R-N

FAULTPGCIL (SR-1)/ PGCIL (SR-2) To-be-discussed

54400KV/230KV NNTPP-ICT-1 28-01-2020/09:32

PRESSURE RELIEF DEVICE

OPERATEDNLCIL To-be-discussed

55

220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 28-01-2020/13:06 28-01-2020/13:41 TRIPPED ON B-N FAULT APGENCO/ TSGENCO


KTPS-Lower Sileru1 Feeder was tripped on C




56220KV-THENI-MOOZIYAR-1 30-01-2020/16:24 30-01-2020/20:19 Tripped on Y-B Fault TANTRANSCO/ KSEBL

KSEBL: Feeder tripped onY-B, Zone-1 fault

,Distance – 104.8 km

57220KV-THENI-MOOZIYAR-1 30-01-2020/14:50 30-01-2020/15:30

TRIPPED DUE TO R-N

FAULTTANTRANSCO/ KSEBL

KSEBL: Feeder tripped on R phase to ground

Zone-1 fault ,Distance – 45.4 km

58 400KV/220KV GAZUWAKA-ICT-2 31-01-2020/14:14 220KV SIDE PROBLEM PGCIL (SR-1) To-be-discussed

59400KV-NELAMANGALA-HASSAN-1 31-01-2020/20:31

TRIPPED ON DISTANCE

PROTECTIONKPTCL/ PGCIL (SR-2) To-be-discussed

60 400KV-HOSUR-KOLAR_AC-2 02-02-2020/18:34 02-02-2020/21:01 Tripped on Y-B Fault PGCIL (SR-2) To-be-discussed

61 400KV-KALVENDAPATTU-PUGALUR-2 02-02-2020/14:16 02-02-2020/20:05 Tripped on Y-nFault PGCIL (SR-2) To-be-discussed

62400KV-HINDUJA-KV_KOTA-2 02-02-2020/11:36


FAULTHNPCL/ APTRANSCO To-be-discussed

63400KV-NCTPS_STAGE_II-SUNGAVARACHAT . 03-02-2020/0 00:51

TRIPPED DUE TO R-N

FAULTTANGEDCO/ TANTRANSCO To-be-discussed


R PHASE INSULATOR DE

CAPKPTCL/ PGCIL (SR-2) To-be-discussed

65400KV-NCTPS_STAGE_II-SUNGAVARACHAT . 05-02-2020/12:07 05-02-2020/16:14 TRIPPED ON C-N FAULT TANGEDCO/ TANTRANSCO To-be-discussed

66 400KV-NELAMANGALA-HASSAN-1 05-02-2020/17:48 TRIPPED ON Y-N FAULT KPTCL/ PGCIL (SR-2) To-be-discussed

67400KV-SRISAILAM_LEFT_BANK-SATTENPALLI 06-02-2020/17:48

DT received at sattenapally

endTSGENCO/ APTRANSCO APTRANSCO:Feeder tripped on DT receive.

68 400KV-SRISAILAM_LEFT_BANK-DINDI-2 07-02-2020/23:36 TRIPPED DUE TO B-N LINE TSGENCO/ TSTRANSCO To-be-discussed

69

220KV-KOTHAGUDEM_TPS_V-LOWER_SILERU 08-02-2020/12:35 08-02-2020/12:59TRIPPED AND REASON

AWAITEDTSGENCO/ APGENCO


KTPS V-Lower Sileru Feeder was tripped on C





TRIPPED DUE TO R-N

FAULTKPTCL/ PGCIL (SR-2) To-be-discussed

71400KV-KALVENDAPATTU-THIRUVALAM-1 09-02-2020/15:42 09-02-2020/16:38

TRIPPED DUE TO R-N

FAULTPGCIL(SR-2) To-be-discussed

72400KV-MEHBOOBNAGAR-RTPS-1 10-02-2020/04:21

TRIPPED AND REASON

AWAITEDKPCL/ TSTRANSCO To-be-discussed

73 220KV-AMBEWADI-XELDEM 10-02-2020/14:54 10-02-2020/18:44 TRIPPED ON B-N FAULT KPTCL/ GED To-be-discussed

74220KV-AMBEWADI-XELDEM 10-02-2020/11:02 10-02-2020/11:18 Tripped at Xeldom end only KPTCL/ GED To-be-discussed

Annexure-III

Page 3 of 11

75

220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 10-02-2020/11:34 10-02-2020/11:52 TRIPPED ON B-N FAULT TSGENCO/ APGENCO


KTPS-Lower Sileru Feeder was tripped on B Phase

to Ground fault at a distance of 40.61Kms from

KTPS end. After getting clearance from SLDC, line

charged at 11:52 Hrs. Line stood ok.

76400KV-MUNIRABAD-RTPS-1 10-02-2020/03:31

TRIPPED AND REASON

AWAITEDKPCL/ PGCIL (SR-1) To-be-discussed

77400KV-RTPS-BTPS-1 10-02-2020/04:20

TRIPPED AND REASON

AWAITEDKPCL To-be-discussed

78400KV/220KV GAJWEL-ICT-2 11-02-2020/07:13

TRIPPED ON BUCCHOLZ

RELAY OPERATIONTSTRANSCO To-be-discussed

79

220KV-THENI-MOOZIYAR-1 11-02-2020/13:19 11-02-2020/14:16Tripped on B-Phase to ground

faultKSEBL/ TANTRANSCO

KSEBL: Feeder tripped on B phase to ground

Zone-1 fault ,Distance – 61 km

80

400KV/220KV MADAKKATHARA-ICT-2 13-02-2020/17:40 13-02-2020/19:40Tripped on LV Side backup

protectionKSEBL

KSEB: When primary side of 200MVA#1 at

Madakkathara end was charged, ICT#2

tripped.Yard inspected and found no

abnormalities.

81220KV-CHILLAKALLU-SURYAPET-1 13-02-2020/19:20 13-02-2020/19:54

TRIPPED DUE TO R-N

FAULTAPTRANSCO/ TSTRANSCO APTRANSCO:A/R successful at chillakallu end.

82400KV/220KV VEMAGIRI_AP-ICT-1 14-02-2020/15:32 15-02-2020/23:04 Y-ph Insulator stack failure APTRANSCO

APTRANSCO:At Loc no.528 insulator stack failed

and replaced.

83400KV-VEMAGIRI_PG-VEMAGIRI_AP-1 14-02-2020/15:32 15-02-2020/21:03 TRIPPED ON Y-N FAULT PGCIL (SR-1)/ APTRANSCO

APTRANSCO:At Loc no.528 insulator stack failed

and replaced.

84

220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 15-02-2020/13:29 15-02-2020/16:40 BN fault APGENCO/ TSGENCO


KTPS-Lower Sileru Feeder was tripped on B Phase

to Ground fault at a distance of 89.95Kms from

KTPS end. After getting clearance from SLDC, line

charged at 16:40 Hrs. Line stood ok.

85

400KV-NARNOOR-SRISAILAM_LEFT_BANK-1 15-02-2020/13:18 15-02-2020/14:28 Y phase pole discrepancy APTRANSCO/ TSGENCO

APTRANSCO:Feeder tripped on R ph,G

,momentary fault ,Feeder test charged and stood

ok.

86

220KV-NAGARJUNASAGAR_AP-

NAGARJUNASAGAR_TS15-02-2020/01:15 15-02-2020/02:09 RELAY MALOPERATION APTRANSCO/ TSTRANSCO APTRANSCO:Feeder not tripped at Tallapalli end.

87

220KV-KOTHAGUDEM_TPS_V-LOWER_SILERU 16-02-2020/11:54 16-02-2020/12:18TRIPPED DUE TO B-N LINE

FAULTTSGENCO/ APGENCO


KTPS V-Lower Sileru Feeder was tripped due to

Momentary Ground . After getting clearance

from SLDC, line charged at 12:18 Hrs. Line stood

ok.

88 400KV-DONI-GUTTUR-1 16-02-2020/14:24 16-02-2020/21:17 b-n fault KPTCL To-be-discussed

89400KV/132KV RAMAGUNDAM-ICT-1 16-02-2020/17:39 16-02-2020/19:25

CT BLAST AT

MALYALAPALLY SSNTPC- RMGDM To-be-discussed

90 HVDC 500KV KOLAR_DC Pole 2 17-02-2020/23:59 17-02-2020/00:36 DUE TO HVDC LINE FAULT PGCIL (SR-2) To-be-discussed

91220KV-KOLAR_AC-CHINTAMANAI-1 17-02-2020/23:59 18-02-2020/00:26

TRIPPED DUE TO SPS ON

POLE TRIPPINGKPTCL/ PGCIL (SR-2) To-be-discussed

92

400KV-NP_KUNTA-KOLAR_AC-1 17-02-2020/23:59

Tripped on OV DUE TO

TRIPPING OF KOLAR POLE

2

PGCIL (SR-1)/ PGCIL (SR-2) To-be-discussed

93 400KV-NELAMANGALA-HASSAN-1 17-02-2020/16:05 TRIPPED ON Y-N FAULT KPTCL/ PGCIL (SR-2) To-be-discussed

Annexure-III

Page 4 of 11

94220KV-KOLAR_KAR-KOLAR_AC-2 17-02-2020/23:59 18-02-2020/00:23






96220KV-KOLAR_AC-CHINTAMANAI-2 17-02-2020/23:59 18-02-2020/00:26



97 400KV-NNTPP-PUDUCHERRY-1 17-02-2020/13:38 17-02-2020/14:04 distance protection NLCIL/ PED To-be-discussed

98 220KV-KOLAR_KAR-KOLAR_AC-2 17-02-2020/17:38 17-02-2020/18:12 SPS OPERATED KPTCL/ PGCIL (SR-2) To-be-discussed

99 220KV-KOLAR_KAR-KOLAR_AC-1 17-02-2020/17:38 17-02-2020/18:10 SPS OPERATED KPTCL/ PGCIL (SR-2) To-be-discussed

100 220KV-KOLAR_AC-CHINTAMANAI-1 17-02-2020/17:38 17-02-2020/18:08 SPS OPERATED KPTCL/ PGCIL (SR-2) To-be-discussed

101 HVDC 500KV KOLAR_DC Pole 2 17-02-2020/17:38 17-02-2020/18:33 DUE TO HVDC LINE FAULT PGCIL (SR-2) To-be-discussed

102 220KV-KOLAR_AC-CHINTAMANAI-2 17-02-2020/17:38 17-02-2020/18:08 SPS OPERATED KPTCL/ PGCIL (SR-2) To-be-discussed

103


NAGARJUNASAGAR18-02-2020/ 13:26 18-02-2020/19:23 MALOPERATION APGENCO/ TSGENCO To-be-discussed

104

400KV-GOOTY-NARNOOR-1 18-02-2020/17:08 18-02-2020/17:47 TRIPPED ON Y-N FAULT APTRANSCO/ PGCIL (SR-1)

APTRANSCO:Feeder tripped on Y ph,G

,momentary fault ,Feeder test charged and stood

ok.

105

220KV-KADAKOLA-KANIYAMPETTA 21-02-2020/ 02:50 b-n fault KPTCL/ KSEBLKSEBL: Tripping is due to decapping of insulator

at tower location: 184( LMS Kadakola-KPTCL )

106400KV-KALPAKKA-ASUPAKA-1 21-02-2020/13:21 21-02-2020/13:54


FAULTAPTRANSCO/ TSTRANSCO APTRANSCO:A/R successful at Kalapaka end.

107400KV-NELLORE_PG-THIRUVALAM-2 22-02-2020/12:07 22-02-2020/13:05


FAULTPGCIL (SR-1)/ PGCIL (SR-2) To-be-discussed

108 400KV-NELLORE_PG-NPS-2 22-02-2020/12:07 22-02-2020/13:05 B-N FAULT PGCIL (SR-1) To-be-discussed

109 400KV-KOCHI-TRICHUR-2 23-02-2020/14:50 23-02-2020/15:07 TRIPPED ON B-N FAULT PGCIL (SR-2) To-be-discussed

110220KV-CHIKKODI-MUDASANGI-1 23-02-2020/15:04 23-02-2020/19:45

TRIPPED DUE TO R-N

FAULTKPTCL/ WR To-be-discussed

111400KV/220KV GAJWEL-ICT-2 23-02-2020/06:13 23-02-2020/18:39

TRIPPED ON BUCHHOLZ

RELAY OPERATIONTSTRANSCO To-be-discussed

112400KV/110KV KANARPATTI-ICT-4 24-02-2020/09:56

DIFFERENTIAL

PROTECTION ACTEDTANTRANSCO To-be-discussed

113220KV-REGULAPADU-ALIPUR LINE-1 26-02-2020/03:54 26-02-2020/04:16

TRIPPED ON DISTANCE

PROTECTIONAPTRANSCO/ KPTCL To-be-discussed

114 400KV/220KV GAJWEL-ICT-4 27-02-2020/10:45 27-02-2020/19:48 RELAY MALOPERATION TSTRANSCO To-be-discussed

115


NAGARJUNASAGAR27-02-2020/06:25 27-02-2020/07:10 TRIPPED ON B-N FAULT APGENCO/ PGCIL(Sr-1) To-be-discussed

116 400KV-GVK-VEMAGIRI_AP-1 27-02-2020/18:10 27-02-2020/19:01 MANUAL ERROR TRIPPING GVK/ APTRANSCO To-be-discussed

117 400KV-KAIGA-GUTTUR-2 28-02-2020/11:49 28-02-2020/13:50 ISOLATOR BREAK DOWN NPCIL (KGS)/ KPTCL To-be-discussed

118 765KV-NIZAMABAD-WARDHA-2 28-02-2020/07:13 28-02-2020/20:18 TRIPPED ON R-Y FAULT PGCIL (SR-1) To-be-discussed

119 400KV-HASSAN-MYSORE-1 01-03-2020/13:57 01-03-2020/16:00 CASCADE TRIPPING PGCIL (SR-2) To-be-discussed

120 220KV-KOZHIKODE-AREACODE-2 01-03-2020/13:57 01-03-2020/14:42 CASCADE TRIPPING PGCIL (SR-2)/ KSEBL To-be-discussed

121 220KV-KOZHIKODE-AREACODE-3 01-03-2020/13:57 01-03-2020/14:42 CASCADE TRIPPING GCIL (SR-2)/ KSEBL To-be-discussed

122 220KV-HASSAN-MRS SHIMOGA-1 01-03-2020/13:57 01-03-2020/14:42 CASCADE TRIPPING KPTCL To-be-discussed

123 220KV-HASSAN-YECHANAHALLI-1 01-03-2020/13:57 01-03-2020/16:29 CASCADE TRIPPING KPTCL To-be-discussed

124 220KV-KADAKOLA-KANIYAMPETTA 01-03-2020/13:57 01-03-2020/18:58 CASCADE TRIPPING KPTCL/ KSEBL To-be-discussed

125 220KV-KOZHIKODE-AREACODE-1 01-03-2020/13:57 01-03-2020/14:30 CASCADE TRIPPING PGCIL (SR-2)/ KSEBL To-be-discussed

126 132KV-KONAJE-MANJESWAR-1 01-03-2020/13:57 01-03-2020/18:44 CASCADE TRIPPING KSEBL/ KPTCL To-be-discussed

127400KV-NELAMANGALA-TALGUPPA-1 01-03-2020/13:57 01-03-2020/14:47

TRIPPED ON

OVERLOADINGKPTCL To-be-discussed

128400KV/220KV KOZHIKODE-ICT-1 01-03-2020/13:57 01-03-2020/14:49

TRIPPED DUE TO

EVACUATION OF LINESPGCIL (SR-2) To-be-discussed

Annexure-III

Page 5 of 11

129 400KV-MYSORE-KOZHIKODE-2 01-03-2020/13:57 01-03-2020/17:13 CASCADE TRIPPING PGCIL SR-2 To-be-discussed

130 400KV-UPCL-HASSAN-2 01-03-2020/13:57 01-03-2020/16:00 CASCADE TRIPPING UPCL/ PGCIL (SR-2) To-be-discussed

131400KV/220KV MYSORE-ICT-3 01-03-2020/13:57 01-03-2020/17:19

TRIPPED DUE TO


132400KV/220KV MYSORE-ICT-2 01-03-2020/13:57 01-03-2020/16:24

TRIPPED DUE TO


133400KV/220KV MYSORE-ICT-1 01-03-2020/13:57 01-03-2020/16:20

TRIPPED DUE TO



TRIPPED DUE TO


135400KV/220KV HASSAN-ICT-2 01-03-2020/13:57 01-03-2020/17:00

TRIPPED DUE TO


136400KV/220KV HASSAN-ICT-1 01-03-2020/13:57 01-03-2020/15:52

TRIPPED DUE TO


137400KV/220KV TALGUPPA-ICT-3 01-03-2020/13:57 01-03-2020/14:47

TRIPPED DUE TO

EVACUATION OF LINESKPTCL To-be-discussed


TRIPPED DUE TO



TRIPPED DUE TO


140400KV/220KV UPCL-ICT-2 01-03-2020/13:57 01-03-2020/17:28

TRIPPED DUE TO

EVACUATION OF LINESUPCL To-be-discussed

141400KV/220KV UPCL-ICT-1 01-03-2020/13:57 01-03-2020/17:28

TRIPPED DUE TO

EVACUATION OF LINESUPCL To-be-discussed

142 400KV-MYSORE-KOZHIKODE-1 01-03-2020/13:57 01-03-2020/15:00 CASCADE TRIPPING GCIL (SR-2) To-be-discussed


TRIPPED DUE TO


144 400KV-NELAMANGALA-HASSAN-1 01-03-2020/13:57 01-03-2020/15:55 TRIPPED ON B-N FAULT KPTCL/ PGCIL (SR-2) To-be-discussed

145400KV-TALGUPPA-HASSAN-1 01-03-2020/13:57 01-03-2020/17:43

TRIPPED ON

OVERLOADINGKPTCL/ PGCIL (SR-2) To-be-discussed

146 400KV-UPCL-HASSAN-1 01-03-2020/13:57 01-03-2020/18:37 CASCADE TRIPPING UPCL/ PGCIL (SR-2) To-be-discussed

147 400KV-HASSAN-MYSORE-2 01-03-2020/13:57 01-03-2020/17:14 CASCADE TRIPPING PGCIL SR-2 To-be-discussed

148HVDC 500KV GAZUWAKA Pole 1 03-03-2020/11:39 03-03-2020/17:09 Thyristor redundancy failure PGCIL (SR-1) To-be-discussed

149


NAGARJUNASAGAR03-03-2020/16:38 03-03-2020/21:27 Distance Protection APGENCO/ TSGENCO To-be-discussed

150220KV-EDAMON-EDAPPON-1 03-03-2020/07:43 03-03-2020/10:21 tripped on bus bar operation KSEBL To-be-discussed

151220KV-EDAPPON-KAYAMKULAM-1 03-03-2020/07:43 03-03-2020/09:13 tripped on bus bar operation KSEBL/ NTPC (KYMKLM) To-be-discussed

152400KV-NAGARJUNASAGAR_PG-RAMAGUNDAM 03-03-2020/17:16 TRIPPED ON Y-N FAULT

PGCIL (SR-1)/

NTPC(RMGDM)To-be-discussed

153 132KV-KODADA-CHIKALLU-1 04-03-2020/00:05 04-03-2020/00:22 TRIPPED ON R-N FAULT APTRANSCO To-be-discussed

154 HVDC 500KV GAZUWAKA Pole 1 04-03-2020/12:28 04-03-2020/04:01 Thyristor side problem PGCIL (SR-1) To-be-discussed

155 400KV-NELAMANGALA-TALGUPPA-1 04-03-2020/06:06 Tripped on R - N Fault KPTCL To-be-discussed

156400KV-NAGARJUNASAGAR_PG-RAMAGUND 05-03-2020/02:22 Tripped on Y- N Fault

PGCIL (SR-1)/ NTPC

(RMGDM)To-be-discussed

157 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 06-03-2020/14:20 06-03-2020/15:06 TRIPPED ON B-N FAULT TSGENCO/ APTRANSCO To-be-discussed

158400KV-SRIPERUMBADUR-CHITTOOR-1 06-03-2020/15:49 06-03-2020/16:12 TRIPPED ON B-N FAULT TANTRANSCO/ APTRANSCO To-be-discussed

159400KV-NARNOOR-SRISAILAM_LEFT_BANK-1 06-03-2020/18:00

TRIPPED DUE TO JUMPER

CUTAPTRANSCO/ TSTRANSCO To-be-discussed

Annexure-III

Page 6 of 11

160400KV-MALKARAM-RAMAGUNDAM-1 07-03-2020/04:38 trip coil alarm TSTRANSCO/ NTPC(RMGDM) To-be-discussed

161220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 07-03-2020/13:25 single phase to ground TSGENCO/ APGENCO To-be-discussed

162220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 07-03-2020/13:25 single phase to ground TSGENCO/ APGENCO To-be-discussed

163400KV-GOOTY-KURNOOL_PG-1 08-03-2020/19:29


FAULTPGCIL (SR-1) To-be-discussed

164 400KV-NIZAMABAD-SHANKARAPALLY-1 08-03-2020/16:34 08-03-2020/20:04 TRIPPED ON Y-N FAULT TSTRANSCO/ PGCIL (SR-1) To-be-discussed

165400KV-NAGARJUNASAGAR_PG-RAMAGUNDAM 08-03-2020/09:35 08-03-2020/13:56 TRIPPED ON B-N FAULT

PGCIL (SR-1)/ NTPC

(RMGDM)To-be-discussed

166

132KV-KONAJE-MANJESWAR-1 09-03-2020/07:59 09-03-2020/08:19

Tripped on over current (Due

to

traction load)

KSEBL/ KPTCL To-be-discussed

167 400KV-KALVENDAPATTU-PUGALUR-1 09-03-2020/09:54 09-03-2020/10:04 relay maloperation PGCIL (SR-2) To-be-discussed

168230KV-KUDANKULAM-TTPS 10-03-2020/06:33 10-03-2020/07:12 TRIPPED ON Y-N FAULT

NPCIL (KKNPP)/

TANTRANSCOTo-be-discussed

169400KV-GAUTAMI-VEMAGIRI_AP-1 11-03-2020/14:53 to avoid circulating currents GMR/ APTRANSCO To-be-discussed

170400KV/220KV JULURUPADU-ICT-2 11-03-2020/18:12

OVER FLUX PROTECTION

RELAY OPERATEDTSTRANSCO To-be-discussed


TRIPPED ON

OVERLOADINGKPTCL/ KSEBL To-be-discussed

172220KV-KOTHAGUDEM_TPS_V-LOWER_SILERU 11-03-2020/14:05 11-03-2020/15:43 BN fault TSGENCO/ APGENCO To-be-discussed

173 400KV-PAVAGADA-HIRIYUR-2 12-03-2020/10:13 SWAPPING PGCIL (SR-2) To-be-discussed

174 400KV-BHADRAVATHI-RAMAGUNDAM-1 12-03-2020/14:43 12-03-2020/18:37 distance protection NTPC(RMGDM)/ WR To-be-discussed

175

400KV/230KV MADURAI-ICT-3 12-03-2020/02:20 12-03-2020/05:18

LV SIDE H/T TO ISOLATE

BUS (230KV BUS COUPLER

BREAKER Y-PHASE CT

BLASTED)

PGCIL (SR-2) To-be-discussed

176

400KV/230KV MADURAI-ICT-1 12-03-2020/01:20 12-03-2020/04:56

230KV BUS COUPLER

BREAKER Y-PHASE CT

BLASTED


177

400KV/230KV MADURAI-ICT-2 12-03-2020/01:20 12-03-2020/05:06

230KV BUS COUPLER

BREAKER Y-PHASE CT

BLASTED


178132KV-KUZHITHURAI-PARASSALA-1 13-03-2020/12:08 13-03-2020/14:50

TRIPPED ON DISTANCE

PROTECTIONTANTRANSCO/ KSEBL To-be-discussed

179 400KV-BIDADI-TUMKUR-1 14-03-2020/11:52 14-03-2020/12:41 R-N FAULT PGCIL (SR-2) To-be-discussed


MAL OPERATION OF POLE

DISCREPANCY RELAYPGCIL (SR-2)/ KPTCL To-be-discussed


OPERATION OF BACK UP

OVER CURRENT RELAYPGCIL (SR-2)/ KPTCL To-be-discussed

182220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 15-03-2020/12:04 15-03-2020/12:33

TRIPPED DUE TO R-N

FAULTTSGENCO/ APTRANSCO To-be-discussed

183400KV/220KV JULURUPADU-ICT-1 16-03-2020/10:40 16-03-2020/12:18

ICT LV BREAKER TRIPPED

DURING SF6 GAS FILLINGTSTRANSCO To-be-discussed

184 400KV-KHAMMAM-ASUPAKA-1 16-03-2020/11:31 16-03-2020/12:50 TRIPPED ON B-N FAULT APTRANSCO/ PGCIL (SR-1) To-be-discussed

185132KV-ASWAROAPET-KAMAVARAPU_KOTA 16-03-2020/12:30 16-03-2020/12:50

OVER CURRENT RELAY

OPERATEDAPTRANSCO/ TSTRANSCO To-be-discussed

186 400KV-KALPAKKA-ASUPAKA-1 16-03-2020/11:55 16-03-2020/12:50 TRIPPED ON B-N FAULT APTRANSCO/ TSTRANSCO To-be-discussed

Annexure-III

Page 7 of 11

187400KV-GUTTUR-HIRIYUR-1 17-03-2020/20:00 17-03-2020/21:47 Bus bar protection operated KPTCL/ PGCIL (SR-2) To-be-discussed

188400KV-KAIGA-GUTTUR-2 17-03-2020/20:00 17-03-2020/15:31 Bus bar protection operated KPTCL/ NPCIL (KGS) To-be-discussed

189 400KV-PALAKKAD-TRICHUR-2 17-03-2020/15:10 17-03-2020/15:31 TRIPPED ON Y-N FAULT PGCIL (SR-2) To-be-discussed

190400KV-GUTTUR-HIRIYUR-2 17-03-2020/13:06 17-03-2020/13:23


FAULTKPTCL/ PGCIL (SR-2) To-be-discussed

191400KV-NARENDRA-GUTTUR-2 17-03-2020/20:00 17-03-2020/21:38 Bus bar protection operated KPTCL/ PGCIL (SR-2) To-be-discussed

192400KV-NARENDRA-GUTTUR-1 17-03-2020/20:00 17-03-2020/21:25 Bus bar protection operated KPTCL/ PGCIL (SR-2) To-be-discussed

193400KV-GUTTUR-JINDAL-1 17-03-2020/20:00 17-03-2020/22:18 Bus bar protection operated KPTCL/ JSWEL To-be-discussed

194400KV-DONI-GUTTUR-1 17-03-2020/20:00 17-03-2020/21:12 Bus bar protection operated KPTCL To-be-discussed

195220KV-KADAKOLA-KANIYAMPETTA 17-03-2020/13:44 17-03-2020/14:10


FAULTKPTCL/ KSEBL To-be-discussed

196220KV-AMBEWADI-XELDEM 17-03-2020/12:41 17-03-2020/16:21


FAULTKPTCL/ GOA To-be-discussed

197400KV/220KV GUTTUR-ICT-2 17-03-2020/20:00 17-03-2020/21:40 Bus bar protection operated KPTCL To-be-discussed

198400KV/220KV GUTTUR-ICT-1 17-03-2020/20:00 17-03-2020/21:40 Bus bar protection operated KPTCL To-be-discussed

199400KV-GUTTUR-HIRIYUR-2 17-03-2020/20:00 17-03-2020/22:01 Bus bar protection operated KPTCL/ PGCIL (SR-2) To-be-discussed

200400KV-KAIGA-GUTTUR-1 17-03-2020/20:00 17-03-2020/21:55 Bus bar protection operated KPTCL/ NPCIL (KGS) To-be-discussed

201HVDC 500KV BHADRAVTAHI Pole 2 18-03-2020/11:48 18-03-2020/12:37

Failure of PLC 4901

processorsWR To-be-discussed

202220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 18-03-2020/12:25 TRIPPED ON B-N FAULT APGENCO/ TSGENCO To-be-discussed

203 400KV-KHAMMAM-ASUPAKA-1 18-03-2020/13:11 18-03-2020/14:06 TRIPPED ON B-N FAULT APTRANSCO/ TSTRANSCO To-be-discussed

204 132KV-ASWAROAPET-KAMAVARAPU_KOTA 18-03-2020/07:22 18-03-2020/08:02 Tripped on Y-B Fault TSTRANSCO/ APTRANSCO To-be-discussed


Failure of PLC 4901



Failure of PLC 4901


207 220KV-UDUMALPET_TN-IDDUKKI-1 18-03-2020/06:52 18-03-2020/07:38 TRIPPED ON Y-N FAULT TANTRANSCO/ KSEBL To-be-discussed

208 220KV-CHILLAKALLU-SURYAPET-1 19-03-2020/23:14 19-03-2020/23:42 R-N FAULT APTRANSCO/ TSTRANSCO To-be-discussed

209 400KV-NARNOOR-SRISAILAM_LEFT_BANK-1 19-03-2020/13:32 19-03-2020/19:34 Tripped on Y-B Fault APTRANSCO/ TSGENCO To-be-discussed

210 400KV-JEYPORE-GAZUWAKA-EAST-1 19-03-2020/19:57 19-03-2020/20:41 TRIPPED ON Y-N FAULT PGCIL (SR-1) To-be-discussed

211 400KV-KURNOOL_PG-NAGARJUNASAGAR_P 19-03-2020/12:12 19-03-2020/12:56 tripped on r-n fault PGCIL (SR-1) To-be-discussed

212220KV-THENI-MOOZIYAR-1 20-03-2020/11:39 20-03-2020/12:05 TRIPPED DUE TO R-N FAULT TANTRANSCO/ KSEBL To-be-discussed

213400KV-RTPS-BTPS-1 20-03-2020/02:11 20-03-2020/03:35

TRIPPED ON SINGLE

PHASE TO GND FAULTKPCL To-be-discussed

214

220KV-NAGARJUNASAGAR_AP-

NAGARJUNASAGAR_TS20-03-2020/18:47 20-03-2020/20:06

TRIPPED ON DISTANCE

PROTECTIONAPTRANSCO/ TSTRANSCO To-be-discussed

215220KV-NAGARJUNASAGAR_AP-CHALAKURTHY 20-03-2020/18:47 20-03-2020/19:59

TRIPPED ON DISTANCE

PROTECTIONAPTRANSCO To-be-discussed


Tripped due to traction

overloadKPTCL/ KSEBL To-be-discussed

Annexure-III

Page 8 of 11

217400KV-MAHESHWARAM_TG-SHANKARAPALLI 20-03-2020/13:38 20-03-2020/17:20 TRIPPED ON B-N FAULT PGCIL (SR-1)/ TSTRANSCO To-be-discussed

218400KV-RTPS-BTPS-1 21-03-2020/02:11 21-03-2020/03:35

TRIPPED ON SINGLE PHASE

TO GND FAULTKPCL To-be-discussed

219

400KV/230KV KUDANKULAM-ICT-1 21-03-2020/12:11 21-03-2020/19:51To control load flow of 230kV

KKNP- S R Pudur lineNPCIL (KKNPP) To-be-discussed

220HVDC 500KV GAZUWAKA Pole 2 21-03-2020/12:15 21-03-2020/14:25

AUXILIARY POWER

FAILUREPGCIL (SR-1) To-be-discussed

221 400KV-GUTTUR-HIRIYUR-2 21-03-2020/13:06 21-03-2020/19:03 TRIPPED ON B-N FAULT KPTCL/ PGCIL (SR-2) To-be-discussed

222 400KV-MADURAI-TIRUNELVELI-2 21-03-2020/14:26 21-03-2020/14:40 TRIPPED ON B-N FAULT PGCIL (SR-2) To-be-discussed

223400KV/220KV GAZUWAKA-ICT-1 22-03-2020/15:45 22-03-2020/17:17

BUS BAR PROTECTION

OPERATED AT LV SIDEPGCIL (SR-1) To-be-discussed

224132KV-KHAMMAM_TS-CHIKALLU-1 22-03-2020/05:00 23-03-2020/05:17

TRIPPED DUE TO R-N

FAULTAPTRANSCO/ TSTRANSCO To-be-discussed

225400KV-NCTPS_STAGE_II-SUNGAVARACHAT 22-03-2020/11:24 TRIPPED ON B-N FAULT TANGEDCO/ TANTRANSCO To-be-discussed

226 400KV-GUTTUR-HIRIYUR-2 22-03-2020/13:07 TRIPPED ON Y-B FAULT KPTCL/ PGCIL (SR-2) To-be-discussed



229220KV-KOTHAGUDEM_TPS_V-LOWER_SILERU 22-03-2020/11:16 22-03-2020/11:38 TRIPPED ON B-N FAULT TSGENCO/ APGENCO To-be-discussed

230400KV/220KV GAZUWAKA-ICT-2 22-03-2020/15:45 22-03-2020/18:34

BUS BAR PROTECTION

OPERATED AT LV SIDEPGCIL (SR-1) To-be-discussed

231220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 22-03-2020/10:15 22-03-2020/18:03 TRIPPED ON C-N FAULT APGENCO/ TSGENCO To-be-discussed

232 220KV-UDUMALPET_TN-IDDUKKI-1 23-03-2020/07:37 23-03-2020/12:26 TRIPPED ON Y-N FAULT TANTRANSCO/ KSEBL To-be-discussed

233 400KV-SATTENPALLY-VTPS_IV-2 24-03-2020/12:38 TRIPPED ON R-N FAULT APTRANSCO/ APGENCO To-be-discussed

234 220KV-SEDAM-TANDUR-1 24-03-2020/13:38 24-03-2020/16:43 TRIPPED ON R-N FAULT KPTCL/ APTRANSCO To-be-discussed

235400KV-ALAMATHY-SUNGAVARACHATRAM-2 25-03-2020/12:05 25-03-2020/17:02


FAULTTANTRANSCO To-be-discussed

236400KV-ALAMATHY-SUNGAVARACHATRAM-2 26-03-2020/12:26 26-03-2020/18:57


FAULTTANTRANSCO To-be-discussed

237220KV-KOTHAGUDEM_TPS_V-LOWER_SILERU 27-03-2020/12:05 27-03-2020/14:40 TRIPPED DUE TO R-N FAULT TSGENCO/ APGENCO To-be-discussed

238400KV-GUTTUR-JINDAL-1 27-03-2020/13:12 27-03-2020/19:04 TRIPPED DUE TO R-N FAULT JSWEL/ KPTCL To-be-discussed

239400KV-MUNIRABAD-RTPS-1 28-03-2020/07:11 28-03-2020/08:07 TRIPPED DUE TO R-N FAULT PGCIL (SR-1)/ KPCL To-be-discussed

240400KV-NCTPS_STAGE_II-SUNGAVARACHAT 29-03-2020/09:28 29-03-2020/10:38

TRIPPED ON SINGLE

PHASE TO GND FAULTTANGEDCO/ TANTRANSCO To-be-discussed

241400KV-SRISAILAM_LEFT_BANK-SATTENPAL 29-03-2020/11:33 29-03-2020/10:38

TRIPPED ON SINGLE

PHASE TO GND FAULTTSGENCO/ APTRANSCO To-be-discussed

242220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 29-03-2020/12:22 29-03-2020/13:19

TRIPPED ON SINGLE

PHASE TO GND FAULTTSGENCO/ SPTGENCO To-be-discussed

243 400KV-VTPS_IV-SURYAPET-1 30-03-2020/13:28 30-03-2020/14:14 TRIPPED ON B-N FAULT APGENCO/ TSTRANSCO To-be-discussed

244 400KV-NEYVELI_TS2_EXP-PUGALUR-1 30-03-2020/15:10 30-03-2020/15:53 TRIPPED ON Y-N FAULT NLCIL/ PGCIL (SR-2) To-be-discussed

245 400KV-HINDUJA-KV_KOTA-1 31-03-2020/12:36 TRIPPED ON Y- N FAULT HNPCL/ PGCIL (SR-1) To-be-discussed

246 400KV-UPCL-HASSAN-1 31-03-2020/14:13 Earth fault Relay Operated UPCL/ PGCIL (SR-2) To-be-discussed

Annexure-III

Page 9 of 11

247400KV-NEYVELI_TS2_EXP-PUGALUR-1 01-04-2020/13:41 01-04-2020/14:13 Single Phase to ground fault NLCIL/ PGCIL (SR-2) To-be-discussed

248400KV-KAIGA-GUTTUR-1 01-04-2020/18:04

tripped due to CT-blast @

kaigaNPCIL (KGS)/ KPTCL To-be-discussed

249400KV-KAIGA-GUTTUR-2 01-04-2020/18:04

tripped due to CT-blast @

kaigaNPCIL (KGS)/ KPTCL To-be-discussed

250220KV-KOTHAGUDEM_TPS-LOWER_SILERU-1 02-04-2020/12:17 02-04-2020/12:37 TRIPPED ON B-N FAULT TSGENCO/ APGENCO To-be-discussed

251 400KV-GOOTY-NARNOOR-1 02-04-2020/13:34 02-04-2020/14:20 TRIPPED ON B-N FAULT PGCIL (SR-1)/ APTRANSCO To-be-discussed

252

220KV-HIRIYUR-GOWRIBIDANUR-1 04-04-2020/14:16 04-04-2020/16:37

TRIPPED DUE TO

BREAKER LOCK OUT AT

GOWRIBIDANUR


253

220KV-HIRIYUR-GOWRIBIDANUR-2 04-04-2020/14:16 04-04-2020/16:38

TRIPPED DUE TO

BREAKER LOCK OUT AT

GOWRIBIDANUR


254220KV-PAVAGADA-KSPDCL4 04-04-2020/08:46 04-04-2020/09:26

TRIPPED DUE TO R-B

FAULT IN 33KV FEEDERPGCIL (SR-2)/ KSPDCL To-be-discussed

255 HVDC 500KV BHADRAVTAHI Pole 1 04-04-2020/21:25 04-04-2020/22:40 AC UNDER VOLTAGE WR To-be-discussed


AUXILIARY POWER

FAILUREWR To-be-discussed

257

230KV-TTGS-GREENINFRA-1 05-04-2020/21:00 05-04-2020/21:21

High frequency relay

operated

50.20

TANTRANSCO To-be-discussed

258

230KV-TTGS-MYTRAH-1 05-04-2020/21:00 05-04-2020/21:25


operated

50.20


259

230KV-TTGS-ORANGESIRONJ-1 05-04-2020/21:00 05-04-2020/21:24


operated

50.20


260

230KV-TTGS-BETAMWIND-1 05-04-2020/21:00 05-04-2020/21:22


operated

50.20


261 400KV/110KV KAYATHAR-ICT-1 05-04-2020/14:46 05-04-2020/23:08 OIL SURGE RELAY ACTED TANTRANSCO To-be-discussed

262

132KV-KUZHITHURAI-PARASSALA-1 05-04-2020/21:00 05-04-2020/16:22

Tripped at Kuzhutarai end

and

code given to H/T at Parsala

end

KSEBL/ TANTRANSCO To-be-discussed

263 400KV-SRISAILAM_LEFT_BANK-DINDI-1 06-04-2020/14:14 single phase to ground TSGENCO/ TSTRANSCO To-be-discussed

264 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 06-04-2020/13:39 06-04-2020/17:37 single phase to ground TSGENCO/ APTRANSCO To-be-discussed

265 220KV-SRISAILAM_RIGHT_BANK-DINDI-2 06-04-2020/13:16 06-04-2020/15:55 single phase to ground APGENCO/ TSTRANSCO To-be-discussed

266 400KV-NARNOOR-GHANI-1 06-04-2020/19:07 06-04-2020/21:20 red hotspot APTRANSCO To-be-discussed

267 400KV-NARNOOR-GHANI-2 06-04-2020/19:07 06-04-2020/21:20 single phase to ground APTRANSCO To-be-discussed

268

220KV-UDUMALPET_TN-IDDUKKI-1 06-04-2020/20:05

h/t due to heavy glow at

UDPT

end

TANTRANSCO/ KSEBL To-be-discussed

269400KV-GUTTUR-JINDAL-1 07-04-2020/16:10 08-04-2020/02:53

TRIPPED ON CONDUCTOR

CUTKPTCL/ JSWEL To-be-discussed

270400KV-GOOTY-RAICHUR_PG-1 07-04-2020/19:04 08-04-2020/02:53

LA BLAST AT RAICHUR

(PG)PGCIL (SR-1) To-be-discussed

271400KV-GOOTY-RAICHUR_PG-2 07-04-2020/19:04 07-04-2020/19:54

LA BLAST AT RAICHUR

(PG)PGCIL (SR-1) To-be-discussed

Annexure-III

Page 10 of 11

272400KV-RAICHUR_PG-RTPS-1 07-04-2020/19:04 07-04-2020/20:04

LA BLAST AT RAICHUR

(PG)PGCIL (SR-1)/ KPCL To-be-discussed

273400KV-RAICHUR_PG-RTPS-2 07-04-2020/19:04 07-04-2020/20:08

LA BLAST AT RAICHUR

(PG)PGCIL (SR-1)/ KPCL To-be-discussed

274 400KV-NARNOOR-MAHESHWARAM_PG-1 08-04-2020/15:30 08-04-2020/15:52 TRIPPED ON B-N FAULT APTRANSCO/ PGCIL (SR-1) To-be-discussed

275 400KV-ANAIKADAVU-THAPPUKUNDU-1 08-04-2020/17:42 TRIPPED ON R-Y FAULT TANTRANSCO To-be-discussed

276 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 08-04-2020/16:53 08-04-2020/17:13 TRIPPED ON R-N FAULT TSGENCO/ APTRANSCO To-be-discussed




280132KV-ASWAROAPET-KAMAVARAPU_KOTA. 09-04-2020/11:54 09-04-2020/16:35 PHASE TO PHASE FAULT TSTRANSCO/ APTRANSCO To-be-discussed

281 230KV-KALVENDAPATTU-THARAMANI 09-04-2020/18:22 B-N FAULT TANTRANSCO To-be-discussed

282400KV-KAIGA-GUTTUR-1 09-04-2020/11:59

TRIPPED ON DISTANCE

PROTECTIONNPCIL (KGS)/ KPTCL To-be-discussed

283400KV-NCTPS_STAGE_II-MANALI-1 09-04-2020/15:10 R-N FAULT TANGEDCO/ TANTRANSCO To-be-discussed

284 230KV-NNTPP-NEYVELI_TS_II-1 09-04-2020/00:12 TRIPPED ON B-N FAULT NLCIL To-be-discussed

285132KV-ASWAROAPET-KAMAVARAPU_KOTA. 09-04-2020/13:51 09-04-2020/18:55 PHASE TO PHASE FAULT TSTRANSCO/ APTRANSCO To-be-discussed

286 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 10-04-2020/08:28 10-04-2020/14:03 TRIPPED ON R-N FAULT TSGENCO/ APTRANSCO To-be-discussed

Annexure-III

Page 11 of 11

Frequency Set points and House load Operation Details furnished by constituents

Sl.NoPlant Name Utility Name Description Machine Unit No Set Point (low frequency) Set Point (High Frequency)

whether House load operation

capability exists

Genetator-1 & 2

(600MW)

51.50 Hz

2.0 Sec

Genetator-2

(600MW)

51.50 Hz

2.0 Sec

Genetator-1

(600MW)

48.5Hz /2.5 Sec

& 47.5Hz/ 2.0 Sec

Genetator-2

(600MW)

48.5Hz /2.5 Sec

& 47.5Hz/ 2.0 Sec

Genetator-1

(210MW) 47.6Hz/ 1Sec -----

Genetator-2

(210MW) ----- -----

Genetator-3

(210MW) 47.6Hz/ 1Sec 51.7Hz/ 1sec

Genetator-1

(210MW) 47.5Hz/ 3sec. -----

Genetator-2

(210MW) 47.5Hz/ 3sec. -----

Genetator-3

(210MW) 47.5Hz/ 3sec. 51.8Hz/ 1sec

(i) Low and high frequency set points of all generators (including RE) in the

existing/proposed Islanding Schemes. All units 47.5Hz for 28sec -Trip 52Hz for 120 sec. -Trip

(ii) Frequency at which generators are taken to house load operation. All units 47.5Hz for 25sec 52Hz for 100 sec.

Generator-1

210 MW 47.50 Hz /2 sec Not Adopted

Generator-2

210 MW 47.50 Hz / 2 sec Not Adopted

Generator-3

210 MW47.50 Hz / 2 sec Not Adopted

Generator-4

210 MW48.5 Hz / 5 sec 50.75 Hz / 5 sec

Generator-5

210 MW47.6 Hz / 2 sec Not Adopted

Generator-1

210 MW

47.00 Hz / 5 sec

( unit trip)Not Adopted

Generator-2

210 MW47.00 Hz / 5 sec


Generator-3

210 MW47.00 Hz / 5 sec


Generator-4

210 MW

47.00 Hz / 2 sec

(House load) Not Adopted

4

TANGEDCO

TANGEDCO

NPCIL

TANGEDCO

House load operation capability not

available for Units -I, II & II and

Available for Iv & V.

Available for all units

Available for all units

2

NCTPS - I

(ii) Frequency at which generators are taken to house load operation.


existing/proposed Islanding Schemes. ( Alarm only)




NCTPS - II

1

KKNPP3




TTPS

Annexure-IV

Page 1 of 2

Generator-5

210 MW

47.00 Hz / 2 sec

(House load) Not Adopted

5 NTPC_Simhadri NTPC Frequency low

48.5 Hz , 5 sec delay (Alarm only)

47.4 Hz , 2 sec (trip and unit taken on

house load)

Yes

6 BTPS KPCL No house load operation

7 T(G)TPS GS TANGEDCO No house load operation

8 UPCL UPCL Frequency low and High Frequency set points

48.5Hz, 2sec (Alarm only)

47.7Hz, 2sec (Trip)

47.5Hz, 0.5sec (Trip)

52.1 Hz, 2 sec (Trip)

9Srisailam Right Bank Power

House 220kV APGENCO 7x110=770 MW Yes

10 Lower Sileru PH 220kV APGENCO 4x115=460 MW Yes

11 Donkarayi Canal PH 220kV APGENCO 1x25 =25 MW Yes

12 Upper Sileru PH 220kV APGENCO 4x60=240 MW Yes

13 Machkund PH 132kV APGENCO 3x17+3x23=120 MW Yes

14Nagarjunasagar Right Canal PH

132kVAPGENCO 3 x 30=90 MW Yes

15Nagarjuna Sagar Tail Pond

Power House 132kVAPGENCO 2 X 25=50 MW Yes

16 Penna Ahobilam HES 132kV APGENCO 2 x 10=20 MW Yes

17 Tunga Bhadra Dam PH 66kV APGENCO 4 x 9=36 MW Yes

18 Hampi PH 66kV APGENCO 4 x 9=36 MW Yes

U#l 48Hz(2I) ,47.5Hz(1") 51Hz(1") ,51.5Hz(0.1")

U#2 48Hz(2") ,47.5Hz(1") 51Hz(1I) ,51.5Hz(0.1")

U#3 48Hz(2I) ,47.5Hz(1") 51Hz(1" ) ,51.5Hz(0.1")

U#4 NA NA

U#5 NA NA

U#6 NA NA

U#l 48Hz(5") ,47.5Hz(0.5") 51Hz(2") ,52Hz(0.5")

U#2 48Hz(5" ,47.5Hz(0.5") 51Hz(2") ,52Hz(0.5")

U#3 48.5Hz(5") ,48Hz(2") 51Hz(5") ,51.5Hz(2")

U#1 48Hz(10") ,47.5Hz(2") 52Hz(5") ,53Hz(3")

U#2 48Hz(10") ,47.5Hz(5") 52Hz(5") ,53Hz(3")

U#3 4.8Hz(10") ,47.5Hz(5") 52Hz(5") ,53Hz(3")

U#4 48Hz(10") ,47.5Hz(5") 52Hz(5") ,53Hz(3")

U#5 48Hz(10") ,47.5Hz(5") 52Hz(5" ) ,53Hz(3")

U#6 48Hz(10") ,47.5Hz(5") 52Hz(5") ,53Hz(3")

U#l 46.5Hz(5") ,46Hz(2") 53Hz(5") ,54Hz(1)

U#2 46.5Hz(5") ,46Hz(2") 53Hz(5") ,54Hz(1)

U#l 43Hz(1") 51.6Hz(0.5")

U#2 43Hz(1") 51.6Hz(0.5")

U#l 47.25Hz(5") , 47Hz(1") 52Hz(2"),52.5(0.2")

U#2 47.25Hz(5" ) , 47Hz(1") 52Hz(2"),52.5(0.2")

U#3 47.25Hz(5") , 47Hz(1") 52Hz(21),52.5(0.2")

NES 47Hz(20") , 46.5Hz(1") 52Hz(1" ),52.5Hz(0.5")

U#l 47.5Hz(5" ) , 47Hz(1") 51.5Hz(5"),52Hz(1")

U#2 47.5Hz(5") , 47Hz(1") 51.5Hz(5"),52Hz(1")

U#l 47.5Hz(1") , 47Hz(0.1") 52Hz(21"),52.5Hz(0.2" )

U#2 47:5Hz(1") , 47Hz(0.1") 52Hz(2"),52.5Hz(0.2")

U#3 47.5Hz(1") , 47Hz(0.1") 52Hz(2"),52.5Hz(0.2")

U#4 47.5Hz(5") , 47Hz(1") 52Hz(2"),52.5Hz(0.1")

U#5 47Hz(10" ) , 40Hz(1") 52Hz(2"),52.5Hz(0.1")

U#6 47Hz(10 ") , 40Hz(1") 52Hz(2"),52.5Hz(0.1")

U#l 45Hz(3"),40Hz(1") 52Hz(2"),52.5Hz(0.1")

U#2 48Hz(5"),47.5Hz(5") 52Hz(2" ),52.5Hz(0.1")

U#3 47.5Hz(5"),47Hz(1") 52Hz(2"),52.5Hz(0.1")

U#4 47.5Hz(5" ),47Hz(1") 52Hz(2"),52.5Hz(0.1" )

Not Available

Not Available

Not Available

Not Available

Not Available

Not Available

Not Available

Not Available

Frequency low and High Frequency set pointsKSEBLSengulam

27

Not Available

Panniar25

KSEBL Frequency low and High Frequency set points

Frequency low and High Frequency set pointsKSEBLPallivasal

26

23Idamalayar KSEBL Frequency low and High Frequency set points

Frequency low and High Frequency set pointsKSEBLNeriamangalam

24

Frequency low and High Frequency set pointsKSEBLSabarigiri

21

Kakkad KSEBL Frequency low and High Frequency set points22

Idukki KSEBL Frequency low and High Frequency set points

19

Frequency low and High Frequency set pointsKSEBLLowr Periyar

20

4

TANGEDCO

House load operation capability not

available for Units -I, II & II and

Available for Iv & V.


TTPS

Annexure-IV

Page 2 of 2

m-R'tfts tTIR: IFAX/SPEEDPOST

'lrn:<f 'H('{> I(

It Government of India~f<twr~ Central Electricity Authority~~ f<twr ufilfct Southern Regional Power Committee

~ - 560 009 mrtn"f~Bengaluru - 560 009

"Web site: www.sroc.kar.nic.in e-mail: [email protected] Ph: 080-22287205 Fax: 080-22259343~/No . ISRPC/SE(O)/20201 ~/Date 24.02.2020

I. Chief Engineer, SLDC, APTRANSCO, Vijayawada2. Chief Engineer, SLDC, KPTCL, Bengaluru3. Chief Engineer (SO), KSEBL, Kalamassery4. Chief Engineer (0), TANTRANSCO, Chennai5. Chief Engineer (P&C), TANTRANSCO, Chennai6. Chief Engineer, SLDC, TSTRANSCO, Hyderabad7. Superintending Engineer- I cum HOD, Puducherry ED, Puducherry8. COM, SR-I, POCIL, Hyderabad9. COM, SR-II, POCIL, Bengaluru10. Executive Director, SRLDC, Bengaluru

Sir,

Sub: SPS schemes implcmentation and mock testing-reg,R ef: CE (P&C), TANTRANSeO letter dated 21.02.2020 (copy enclosed)

The SPS is of paramount importance for secured grid opera tion. The new DTPCs were

commissioned by POCIL at the locations from where the signal was to be extended to the new I

existing identified load reliefs by the states for the Talcher-Kolar, Raichur-Sholapur and

KKNPP-I&2 S1'S schemes. The DTPC commissioning was completed by POCIL in the IS'

quarter of 2019.

The S1'S Distribution Matrix was finalized in the 77lh meeting of 1'CSC held on

21.08.2018 .

Despite sustained follow-up in the ace I 1'CSC meetings, some of the SPS nodes are

yet to be armed which is a matter of serious concern.

In the 164'hOCC meeting held on 11.02.2020, it was noted that all the works except few

nodes in K1'TCL in respect of SPS were completed. 111e works were planned to be completed

by 26.02.2020 and therefore mock test was planned on 27.02.2020. In the 89'h 1'CSC meeting

held on 13.02.2020, it was noted that there were some pending works in respect of nodes of

TANTRANSCO (port confirmation) and KPTCL (wiring issues). TANTRANSCO vide letter

under reference has pointed out that port confirmation in respect of nodes of TANTRANSCO

was yet to be received from SR-II, 1'OCIL and requested for reschedule of the mock test.

This urgent matter needs to be addressed immediately by taking following steps:

Annexure-V

Page 1 of 16

I. All pending works to be completed by states/POCIL by 29.02.2020 (Saturday) .

States/POCIL to coordinate with each other.

2. SPS Distribution matrix is annexed to the 77lh pCSC minutes (available on SRI'C

website).

3. Final mapping / wiring diagram may be furnished by states/I'OCIL along with

modified reliefs, if any.

4. Mock test to be held on 04.03.2020 (Wednesday)

It is kindly requested to issue suitable directions to ensure completion of this urgent

long pending issue.

tj.-<j em:; !Thanking you,

~ I Yours faithfully

mnr: <r~ / End: As above

Copy for kind information:

I. Director (Or.&TM), APTRANSCO, Vijayawada2. Director (Transmission) , KPTCL, Bengaluru3. Director (Tr, SO & S), KSEBL, Thiruvananthapuram4. Director (Operation), TANTRANSCO5. Director (Orid Operations), TSTRANSCO, Hyderabad

Annexure-V

Page 2 of 16

Fron:f.r . S.SEKl(ILAR,B.E"Chief Engineer,Protection and Communication.TI\NTRANSCO,First Floor, 55-Block,144, Anna Salai, Chen na i - 600 002,

TI\NTRflN5CO

~0 7, ....The rviernber seuclilryJ Southern Region Pm':er Commi tte," ( SRPC)

No.29,RzKe COll IS~ cross HOCld,Bengaluru- 560 009

The Execut ive DirectorSouthern Region load Dispatch Centre ( SR1DC)No. ;~9 , R3ce Course cross Road,Ben9aluru- ~()O Oar;

Lr, No. Cl'.jPfl, Cj SEjD/I:PC-4 / AI'.E-S / F.5 I'S SCHEHES/D. No. 'r /20, date d : '~U) 7. . 20 7.0 .

Sir,

Sub: TANTRANSCO - SPS SCHEI'lES ... implementat ion 0 ' Sf'S schemes in TilmilNadu as pel ?eSC77 deliberations - port confirmation req uested to pee!!. -- rc~: .

Ref: l.PCSC 'rr deliberations for SPS schemes.LLr.No.CE/ P&C/SE/D/ EPC-4/ M ,E-5{then Af:E. 3 )!f, SP~; SClIEi"I!:S!D. No.0 3/ ! 9, dated:2ii , i 2, ! 9 .

The port termination to DTPC are still pending for want of port ccnfi rmation (rom PGCJL. The Issuewas addressed to you vide ref cited 2 ami also discus sed if' the :>9'" PCSC 1I j(~eti~g held on 14.02 .20 20 a~

SRPC, BengalunJ. In the, PCSC 891" meetin q, r'1/s. PGCii. assured to Iu rmsh the deteils by 11.02 .2020 bur

the port confi rmation details are not yet received.

A mock lest (or all SPS schemes has been programmed by '; :~.LDC on 27.02.2020 . The receipt of aaSPS 519n;]1at load point car, be ensured on ly aftcr termlnaliou of \,/;";n9 from DTPC loc~ l ion to load point,

Hence it is requested that necessary arranqement mu'{ be fI1~ue to r port cont irrnat ion of each DTPC$of Tamil Nadu and also requested to reschedule the mock test " fler com plet ion of above work.

.- "; • ~_ .. . • . ... I \ . -c

-~~-,,!- _;'~"" >" \ r,). .-\ F-' ,,··· ' .l J ! f .l_ \ bO

- ~_

Chief Engineerl . {':.e

Copy by mail:Copy submit ted to the Direcl or Operatio n / Tr,NTRANSCOCOliI' to th e Chief Engim:er / Grid operat ion I ChenneiCopy to the Chief Engineer / System Operat ion / Cheuna: e•.Tri chy .

. Copy to the Superintending Engineer / LD S, GO / Operation & EXl'cu!,ive Engineers/ I.DC ( by email)Copy to " II the Superin tending Engineers & all Executive cn;j ill cers / Pf,C ( by ernail )

It is requested to ensure the 'Niring from DTPC to load POillt ,,5 per rd cited t&2 and also req ue~~t t?(j

£0 make necessary al l"angernenls for tenn inatlon of wiring to DTPC POlt .

Annexure-V

Page 3 of 16

Raichur-Solapur feeders- Special protection scheme

F.O

F.O

F.O

F.O

F.O

Signal from raichur

Through DTPC i.e RS1

Kolar HVDC

Signal from raichur


Kolar HVDC

Mysore 400KV

Signal from raichur


Kolar HVDC

Mysore 400KV

Annexure-V

Page 4 of 16

SPS scheme implementation at Raichur SS

5P -2..

- ~ or ~.,;. - - - -SPS-1B RS-1 2 ssqmm cu cable ,

I&

SPS-3 I\ \

\ IFa HVDC Kolar

/n-

SPS-1A(1) RS-2 2.ssqmm cu cable ~or • I

SPS-3 L DB2s, ,& , DTPC

SPS-1Bt DIP MUX I,

5000 FaI Mysore...---L-

, , Fa .> 400KV SS, ,...---,\

)

SPS-1A(2) RS-3 2.ssqmm cu able

or'l'

SPS-3 J Lor \

SPS-1B I- - .. - .--. - - --- - - - - -DTPC

- MUX r--

Valiant

SPS-1A (1) ---- summated flow of both RCR-SLP is more than 3000MW (import) for ssec.

SPS-1A (2) ---- summated flow of both RCR-SLP is more than 3000MW (import) for 7.ssec.

SPS-1B-------- summated flow of both RCR-SLP is more than 3s00MW (import) for 2.ssec.

SPS-3----------loss of RCR-SLPD/C line more than ls00MW(import) due to tripping of both lines

Annexure-V

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Annexure-V

Page 6 of 16

PORT NUMBER at Source/Destination DTPCs provided by PGCIL (SR-2)

S. No Destination Source

DTPC

DTPC

MakeRS1 RS2 RS3 TK1 TK2 TK3 KK1 KK2

1 Ananthapur Kolar DIP5000 1 2

2 Chinakampalli Kolar DIP5000 1 3 4

3 Somayajulapalli Kolar DIP5000 1

4 Kurnool Kolar DIP5000 1

5 Gooty Kolar DIP5000 1 4

6 Gazvel Kolar DIP5000 1

7 Mahboob Nagar Kolar DIP5000 1

8 Budidampadu Kolar DIP5000 1

9 Ramagundam Kolar DIP5000 1

10 Kolar Kolar PLCC

11 Hoody Kolar PLCC

12 Soman Halli Kolar DIP5000 1 4 2

13 Nelamangala Kolar ABB 1 2 3 4

14 Mysore Raichur Valient 1 2

15 Hassan Salem Valient 1

16 Guttur Salem Valient 1

17 Trichur Kolar DIP5000 3 1

18 Kannur Kolar DIP5000 1

19 Pallam Kolar DIP5000 3

20 Edappon Kolar DIP5000 3 4

21 Shornur Salem Valient 1

22 Chalakudy Salem Valient 1

23 Kundra Salem Valient 1

24 Edamon Salem Valient 1

25 Pothencode Salem Valient 1

26 Areacode Salem Valient 1

27 Malaparamba Salem Valient 1

28 Hosur Kolar PLCC 1

29 Madurai Kolar DIP5000 3 1 2 4

30 Karaikudi Kolar DIP5000 1 4

31 Thiruvarur Kolar DIP5000 3 1 4 2&1

32 Trichy Kolar DIP5000 3 1 4 2

33 Arasur Raichur Valient 1 2

34 Salem 400 Kolar DIP5000 2 1 3 4

35 Sriperambadur Kolar DIP5000 1 3 4 2

36 Myvady Salem Valient 1

37 Cuddalore Salem Valient 1

38 Alamathy Salem Valient 1

39 Shoolagiri Kolar PLCC 1

40 Ingur Salem Valient 1

41 Ingur Kolar DIP5000 3 1 4 1

42 Karekal Salem Valient 1

43 Salem 400Kudankula

mValient

1,2,3

,4

5,6,7

,8

44 Kolar Raichur DIP5000 1 2 3 4

45 Kolar Gooty DIP5000 1

46 Kolar NelamangalaDIP5000 1

47 Kolar Madurai/UDPT DIP5000 1 2

PORT NUMBER at

Source/Destination DTPCs

Annexure-V

Page 7 of 16

Talcher-Kolar

Signal -1

220kV Kolar Line 1 & 2

66kV ITI

66kV Pottery Road

66kV Shantiniketan

Talcher-Kolar

Signal -2

66kV Kumbalgod

66kV Jigani 1&2

66kV Kanakpura 1&2

Talcher-Kolar

Signal -3

220kV Chintamani Line 1 & 2

Through PLCC

Hard wiring

WIRING DIAGRAM EXISTING & PROPOSED FOR TALCHER - KOLAR SPS SIGNAL 1, 2 AND 3

Received at 400kV PGCIL Kolar DTPC

Received at 400kV Hoody

Received at 400kV PGCIL Kolar DTPC

Received at 400kV

Somanahalli PGCIL

220kV Hoody

220kV Somanaha

lli

Received at 400kV PGCIL

Kolar DTPC

Annexure-V

Page 8 of 16

66kV Mattanavile

66kV S Belagola

RS-2 Signal66kV

G. Ukkada

66kV

Madeshwa

rapura

66kV Bogadhi

66kV Elwala

66kV

Akkurmole

RS-3 Signal

66kV DK Maidan 66kV Honnali

66kV RK Nagar

66kV CR Patna

66kV Mysore 1

66kV Mysore 2

Through PLCC

Hard wiring

WIRING DIAGRAM EXISTING & PROPOSED FOR RS-2 & RS-3 SPS SIGNALS


Bastipura DTPC


Bastipura DTPC

220kV Hootagalli

220kV Hootagalli

220kV Toobinaker

e

220kV K.R. Pete

220kV C.R. Patna

220kV Vajamangal

a

220kV Vajamang

ala

220kV Kadakola

220kV Chamaraj

nagara

220kV Gopalapur

a

220kV HN Pura

Annexure-V

Page 9 of 16

Anchepalya-2

66kV T.G Halli

66kV Huliyur Durga 110kV K.G Temple

66kV Amruthur 110kV Gubbi

KK-1 Signal

110kV Turuvekere

66kV Chelur 110kV Mayasandra

66kV Peresandra

66kV Kanaswadi 66kV Bagepalli line-1

66kV Davanagere 66kV Savalanga

66kV Yeragunta

66kV AvaregereKK-2

Signal

110kV Nagenahalli

110kV Tangli

110kV Neralekere

66kV DVG-1

66kV DVG-2

66kV Chikkamagalur

66kV Hiremaglur

66kV CR Patna line2

Through PLCC

66kV Banavara

Hard wiring 66kV Arasikere

WIRING DIAGRAM EXISTING FOR KK-1 SPS SIGNAL

PROPOSED WIRING DIAGRAM FOR KK-2 SPS SIGNAL

Received at 400kV PGCIL Nelamangala

DTPC

Received at 400kV PGCIL Guttur DTPC

220kV Davanager

e

220kV DB Pura

220kV Anthrasana

halli

220kV Nittur

220kV Honnali

220kV MRS Shivmoga

220kV Kadur

Received at 400kV PGCIL Shantigrama

DTPC

220kVChikkamang

alur

220kV Hassan

220kV Gowribidn

ur

220kV Anchepal

ya

220kV KB Cross

220kVArasikere

Annexure-V

Page 10 of 16

Sl.No.Name of the SPS Trip

Signal

Quantam of

Load relief by

KPTCL in MW

DTPC LocationTripping of loads envisaged at Sub

Stations220kV/110kV/66kV Feeders List Remarks

1Talcher-Kolar SPS

Trip Signal 1 - TK1250 400kV PGCIL Kolar 400/220kV at Kolar PGCIL Station 220kV Kolar 1&2 lines

2Talcher-Kolar SPS

Trip Signal 2 - TK2200

400kV PGCIL Kolar

400kV PGCIL

Somanahalli

From 400kV PGCIL Kolar signal transmitted

to 400kV Hoody then to 220kV Hoody to

trip 66kV feeders

From 400kV PGCIL Somanahalli signal

transmitted to 220kV Somanahalli to trip

66kV feeders

66kV ITI

66kV Pottery Road @ Hoody 220kV

66kV Shantiniketan

66kV Kumbalgod

66kV Jigani 1&2 @ Somanahalli 220kV

66kV Kanakpura 1&2

3Talcher-Kolar SPS

Trip Signal 3 - TK3109 400kV PGCIL Kolar 400/220kV at Kolar PGCIL Station 220kV Chintamani 1 & 2 lines

4Raichur - Sholapur

Trip Signal 2 - RS2100 400kV Bastipura

From 400kV Bastipura, signal transmitted

to 220kV Hootagalli, Tubinakere, K.R.Pet,

C.R. Patna through PLCC to trip 66kV

feeders

66kV Bogadi & Elwala @ 220kV Hootagalli

66kV G.Ukkada @ 220kV Tubinakere

66kV Madeshwarapura@ 220kV KR Pet

66kV Mattanavile & S Belagola @ 220kV CR Patna

5Raichur - Sholapur

Trip Signal 3 - RS397 400kV Bastipura


to 220kV Hootagalli, TK Halli, Kadakola,

Chamarajnagar, Holenarasipura through

PLCC to trip 66kV feeders

66kV Akkurmole @ TK Halli

66kV DK Maidan & RK Nagar @ Kadakola

66kV Honnali @ Chamarajnagar

66kV CR Patna, Mysore 1 &2 @ HN Pura

6Kudankulam Unit I

SPS Signal I - KK1193 400kV Nelamangala

From 400kV Nelamangala, trip signal

transmitted to 220kV Anchepalya, Nittur,

KB Cross, Anthrasanahalli,

Doddaballapura, Gowribidnir through


66kV Anchepalya-2, Huliyur Durga,

66kV T.G Halli & Amruthur @ 220kV Anchepalya

110kV K.G Temple & Gubbi @ 220kV Nittur

110kV Turuvekere & Mayasandra @ KB Cross

66kV Chelur line @ 220kV Anthrasanahalli

66kV Kanaswadi line @ 220kV Doddaballapura

66kV Peresandra & Bagepalli line-1 @ 220kV

Gowribidnur

400kV Guttur

From 400kV Guttur trip signal transmitted

to 220kV Daavanagere and Honnali

through PLCC to trip 66kV feeders

66kV Davanagere, Yaragunta & Avaregere @ 220kV

Davanagere

Savalanga @ 220kV Honnali

Cable should be laid

between DTPC and to

Davanagere & Honnali

PLCC Cabinet

400kV Shantigrama

From 400kV Shantigrama trip signal

transmitted to 220kV Shimoga,

Chikkamangalur, Kadur, Arasikere and

Hassan through PLCC to trip 110kV and

66kV feeders

66kV DVG 1 &2 @ 220kV MRS Shimoga

110kV Nagenahalli, Tangli & Neralekere @ Kadur, 66kV

Chikkamagalur & Hiremagalur @ 220kV

Chikkamangalur,

66kV Arasikere & Banavara @ 220kV Arasikere,

66kV CR Patna -2 line @ 220kV Hassan.

Cable should be laid

between DTPC and

Shimoga & Hassan PLCC

Cabinet

DETAILS OF SPS TRIP SIGNALS AND LOAD RELIEF AT KARNATAKA

Wiring should be

changed from

Nelamangala PLCC

cabinet to DTPC

7Kudankulam Unit II

SPS Signal II - KK2174

Annexure-V

Page 11 of 16

Sl.No.Name of the SPS Trip

Signal

Quantam of Load

relief by KPTCL in MWDTPC Location

Tripping of loads envisaged at Sub

StationsRemarks

1Talcher-Kolar SPS Trip

Signal 1 - TK1250 400kV PGCIL Kolar 400/220kV at Kolar PGCIL Station


Signal 2 - TK2200

400kV PGCIL Kolar

400kV PGCIL Somanahalli

From 400kV PGCIL Kolar signal transmitted

to 400kV Hoody then to 220kV Hoody to

trip 66kV feeders

From 400kV PGCIL Somanahalli signal

transmitted to 220kV Somanahalli to trip

66kV feeders


Signal 3 - TK3109 400kV PGCIL Kolar 400/220kV at Kolar PGCIL Station

4Raichur - Sholapur Trip

Signal 2 - RS2100 400kV Bastipura


to 220kV Hootagalli, Tubinakere, K.R.Pet,

C.R. Patna through PLCC to trip 66kV

feeders

5Raichur - Sholapur Trip

Signal 3 - RS397 400kV Bastipura


to 220kV Hootagalli, TK Halli, Kadakola,

Chamarajnagar, Holenarasipura through


6Kudankulam Unit I SPS

Signal I - KK1193 400kV Nelamangala

From 400kV Nelamangala, trip signal

transmitted to 220kV Anchepalya, Nittur,

KB Cross, Anthrasanahalli,

Doddaballapura, Gowribidnir through


No Change

400kV Guttur

From 400kV Guttur trip signal transmitted

to 220kV Daavanagere and Honnali

through PLCC to trip 66kV feeders

Work Completed

Signal extended from newly

commissioned DTPC to

Davanagere & Honnali PLCC

panels@ Guttur, Downstream

wiring is ready from KPTCL.

400kV Shantigrama

From 400kV Shantigrama trip signal

transmitted to 220kV Shimoga,

Chikkamangalur, Kadur, Arasikere and

Hassan through PLCC to trip 110kV and

66kV feeders

Signal should be extended from

newly commissioned DTPC to

Shimoga & Hassan PLCC Cabinet

@ Shantigrama by PGCIL,

Downstream wiring is ready from

KPTCL.

DETAILS OF SPS TRIP SIGNALS AND LOAD RELIEF AT KARNATAKA

Work Completed

Signal extended from newly

commissioned DTPC @ Bastipura.

Earlier signal was received @

Nelamangala and transmitted to

Bastipura through PLCC.

Downstream wiring ready from

KPTCL

7Kudankulam Unit II SPS

Signal II - KK2174

Rearrangement of SPS signals @

Kolar PGCIL has to be done as the

load relief is much higher than

the schedule given for karnataka

for TK1 signal. Requested vide

this office letter dated 31.08.2019

(enclosed)

Annexure-V

Page 12 of 16

1

KERALA STATE ELECTRICITY BOARD LTD.(lncorporated under the lndian Companies Act, 1956)Office of the Chief Engineer (Transmission SystemOperation)LD Centre, H.M.T.Colony P.O., Kalamassery - 683 503.Phone: 0484 2555965,2543850, 9496019100 Fax: 04842555950Email : [email protected], [email protected] : www.kseb.in. C IN : U40 1 00KL20 11 S G C027 424

No.CESO/EELD1/AEGS/SPS/2019-201 I I 5'&

'l'o

General Manager(ULDC), SR-II,

PGCIL, Bangalore

Date: 5 108119

Sir,

Sub: Review of Distribution of Loads and Signal Paths of Raichur -SholapurSPS,

Talcher-Kolar SPS, Kundankulam (Relocation of SPS schemes)- reg:

Ref: SRPC/ SE-III IPCSC-761 201815769-804 dated 06.09.2018(Minutes ot l7h

PCSCI meeting )

Wiring from DTPC to Relay on account of the SPS relocation at all location

has been completed. But there is ambiguity regarding the input to be connected at the

DTPC end . So we need the assistance of PGCIL-SR II for completing this task. All

other works from KSEB side has been completed and is ready for end to end testing. It

is requested that necessary steps may taken to complete the same.

\ Chief

ryCopy submitted to : The Member Secretary, SRPC, Bangalore.

Copy to:

1 ) The Deputy Ch i ef E ng i neers,SOC, Ka la massery/Ka n n ur/Th i ruvanatha puram

2 )The Assistant Executive E ng i neer,TNMS, Kala massery.

Yours faithfully,

Annexure-V

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Annexure-V

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Annexure-V

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1979-2016intimation to SRPC. The status regarding the same shall be discussed in meeting. Review...

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