SOUTHERN REGIONAL POWER COMMITTEE · PDF fileheld on 21st November 2013 in the Conference Hall...

SOUTHERN REGIONAL POWER COMMITTEE BANGALORE

Minutes of the 26th

Meeting of Protection Coordination Sub-Committee

of SRPC held on 20 & 21.11.2013

1. Introduction

1.1 The 26th Meeting of Protection Coordination Sub-Committee (PCSC) was

held on 21st November 2013 in the Conference Hall of Southern Regional

Power Committee, Bangalore. It was preceded by the Sub Group meeting

of PCSC on 20th November 2013. The list of participants for the Sub Group

and the PCSC meeting is enclosed as Annexure - I & II respectively.

1.2 Shri S. R. Bhat, Member Secretary i/c, SRPC welcomed Shri R.S

Alagappan, Chief Engineer (P&C), TANTRANSCO and other Members and

Participants to the 26th Meeting of the Protection Coordination Sub-

Committee. He said that NEW Grid and Southern Region Grid were

scheduled to be synchronized in the near future with the commissioning of

765 KV Raichur - Sholapur line to form “NEWS” Grid. He also stated that

SPS as proposed by NLDC/POSOCO, were to be in place before the NEW

Grid synchronization with the Southern Region. The time schedule for

implementation was to be discussed in the meeting.

1.3 MS i/c, SRPC briefed the forum that issues relating to Power Swing

Blocking settings of Distance Relays, Philosophy of Zone 3 settings and

also time delays in df/dt relays were discussed in the Sub Group meeting.

He added that the frequency controller test as on HVDC Bhadrawathi link

was scheduled to be held on 22nd November 2013.

1.4 MS i/c, SRPC requested the constituents to submit the Report/data relating

to Grid Occurrences/disturbances as specified in the Regulations to SRLDC

and SRPC within the prescribed time. This was highly essential to analyze

the occurrences and come out with remedial measures/action.

Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013

2. Confirmation of the Minutes of the 25th Protection Coordination Sub-Committee meeting held on 22nd October 2013

The Minutes of the 25thPCSC meeting were confirmed, since no comments

were received from the constituents.

3. Recommendations of the Sub Group meeting of PCSC held on 20.11.2013.

3.1 Recommendations w.r.t. Zone 3 settings in SR KPTCL and APTRANSCO would review the impedance settings of the

lines as mentioned in SRTS-II, PGCIL letter (Annexure III). Load encroachment feature would be enabled on all 400 kV lines and also

on 220/230 KV lines where Numerical relays are installed. Load angle shall be kept below 30 degree and if possible it should be set

at 26 degree. Resistive reach of the relay should be more than sum of line resistance,

Arc resistance and Tower foot resistance. Resistive reach of the relay should be less than minimum load resistance

of the system ideally if possible should be kept at 60% of minimum Load resistance. This percentage is only an indicative figure, places where high resistance fault have occurred should analysis previous fault data for setting resistive reach.

Out of Step Settings to be enabled in Critical lines after due analysis of PMU data.

Timing for Zone-3 action is as follows: o 400 kV lines – 1 sec. o Interstate lines – 1 sec o For Zone 4/5/Rev Zone : Zone 3 time + 100 msec

Timing for Zone-2 is as follows:

o 350 ms o if long line is followed by a short line: 500 ms but with the approval

of PCSC forum of SRPC o The forum agreed for the staggered settings i.e. 350ms, 400ms,

450ms and 500 ms as requested by PGCIL.

3.2 Power swing block Settings in SR Existing Settings of Power Swing Block to be continued. The Sub Group recommended for KGS-Kaiga lines to also block Power

Swing for 2 seconds in line with the Regional Settings.

3.3 df/dt settings in SR

The time delay of up to 0.6 sec maximum for both detection and tripping of df/dt relay was agreed.


MS i/c, SRPC informed that the initiation df/dt settings would be reviewed as per the system requirements.

3.4 O/V settings:

The existing practice of time and voltage graded tripping would be continued.

The constituents were advised to enable the over voltage settings and DEF settings as recommended by the OCC/PCSC forums of SRPC at the earliest. Confirmation in this regard may be sent to the PCSC forum for record purpose.

4. Grid Disturbances in Southern Region

4.1 Multiple tripping & generation loss at Idukki power station on

03.11.2013 at 18:17 Hrs

(i) Date and Time of event 03.11.2013 at 18:17 Hrs

(ii) Location Idukki, Kerala

(iii) Plant and/or Equipment

directly involved Idukki Power Station, KSEB

(iv) Reported Disturbance / Fault

CB blast of unit 5 of Idukki resulted in tripping of 4

Nos Idukki units along with 220kV lines from Idukki

power station

(v) Generation Loss 400 MW

(vi) Duration of interruption 40 Minutes to 3 Hours

(vii) Category GD 1

The Grid Disturbance analysis as submitted by SRLDC is enclosed as

Annexure-IV.

The Grid Disturbance Report as submitted by KSEB is enclosed as

Annexure-V.

Deliberations

It was brought to the notice of the forum that all running units and connected 220kV lines at Idukki had tripped.

KSEB informed the following: o The triggering incident was failure of circuit breaker of Unit #5 at Idukki

hydro station. o Y phase limb of the Circuit Breaker had exploded. They informed the

substation was old (commissioned in the year 1986). o They have replaced the old relay (high impedance) with the Numerical

Relay (of Low impedance type). o The bus-bar scheme does not have provision (i.e. bus coupler is

without CT) for isolating one bus section during fault in the adjacent bus bar.


Recommendation

As the Plant was more than 25 years old, all yard equipment need to be replaced.

Modification of Bus Scheme to be carried out.

4.2 Multiple tripping & generation loss at Idukki power station on 07.11.2013 at 17:22 Hrs

(i) Date and Time of event 07.11.2013 at 17:22 Hrs

(ii) Location Idukki, Kerala

(iii) Plant and/or Equipment directly

involved Idukki Power Station, KSEB

(iv) Reported Disturbance / Fault

All running units /available lines at 220kV Idukki

Station (KSEB) tripped due to Bus PT flashover

which resulted in external fire.

(v) Generation Loss 590 MW

(vi) Duration of interruption 1 Hour 35 Minutes to 22 Hours 30 Minutes.

(vii) Category GD 1

The Grid Disturbance analysis as submitted by SRLDC is enclosed as

Annexure-VI.

The Grid Disturbance Report as submitted by KSEB is enclosed as

Annexure-VII.

Deliberations

KSEB informed that all the running units and the connected 220 KV lines at Idukki Hydro Generating stations had tripped.

The triggering incident was failure of Bus Potential Transformer and it lead to the multiple tripping and generation loss to the tune of 590 MW.

Recommendation

The PCSC forum recommended for the modification of Bus Bar protection scheme at Idukki Substation. In the event of bus fault the entire substation should not be affected. This would improve the reliability and security of the Idukki Hydro Generating station.

5. Grid Incidences in the Southern Region

SN

Details of Event Date & Time

Reason 26th

PCSC Deliberation Cate- gory

1 400kV Hassan-

UPCL line

5.11.2013

at 10:48

Hrs

Transient fault in

B-Phase. Line

did not auto

reclose

(i) It was informed that the

Auto Reclosure was blocked

at Hassan Substation.

(ii) It was informed that the

DR was not time

synchronized.

(iii) PCSC forum

recommended UPCL to

check their distance

GI-2


protection system.

PGCIL and UPCL to

implement POR/POTT

scheme for distance

protection on UPCL-Hassan

Lines.

2

Tripping of 220kV

Gooty-Alipura line

3.11.2013

at 12:44

Hrs

Delayed

clearance

observed from

PMU data

(i)APTRANSCO Single bus

system with multiple lines in

the Substation.

(ii)The PCSC forum

recommended for provision

of Bus Bar Protection

system in the 220 KV

Alipura Substations.

GI-I

3

Tripping of 220kV

Idukki-Udumalpet

line

2.11.2013

at 13:15

Hrs

Delayed

clearance

observed from

PMU data

(i)KSEB informed that at

Idukki zone-2 tripping was

there.

(ii)It also said carrier

received from Udumalpet

and PLC counter operated

but relay not operated.

(iii)They were planning for

End to end testing.

(iv) At Udumalpet D/R would

be enabled.

(v)KSEB informed that at

Moolamattom single phase

A/R was not there as the

relay is without that feature.

The relay would be replaced

with the numerical Relay.

GI-1

4

Tripping of 400

KV Ramagundam

Hyderabad Lines 4.

25.10.2013

at 23:30 hrs

Tripped at

Hyderabad end

OV-tripped at

RDM on receipt

of DT.

The ICT was not tripped As

reported in the Agenda. GI-2


5

Tripping of 220kV

Kaiga-Kodasalli

line, 220kV

Kodasalli-Nagjheri

line & 220kV

Kodasalli-Kadra

line

25.10.2013

at 13:21

Hrs

Back up

protection had

operated.

Fault observed in

Y-B phase which

was cleared in

440 ms

(i) KPTCL informed that no

data was received from

KPCL

(ii) KPCL informed that no

DR/EL for the Substation.

(iii)KPTCL informed that No

Generation at Nagjhari and

Kadra at the time of fault.

(iv)The PCSC forum

requested for timely

submission of tripping /

Analysis Report.

Expert Team to be sent to

analysis the tripping as no

information about the

tripping was available with

the forum.

GI-I

6

Tripping of

400/220kV

Vijayawada ICT-

1&2

25.10.2013

at 10:32

Hrs

Both ICT 220kV

side breakers had

tripped due to

operation of bus-

bar protection in

220 kV

switchyard of

APTRANSCO.

(i)APTRANSCO informed

that on the day of tripping,

there was heavy raining.

(ii) It was informed that the

Substation had 2 bus

schemes, and both bus-1 and

bus2 got tripped during the

incident.

(iii) APTANSCO informed

that there was relay

scheme/topology problem

and the same will be rectified

in one month time.

GI-2

7 Tripping of 400 kV Gooty-NPS line-2

19.10.2013

at 16:03

Hrs

Direct trip

received at both

ends

(i) It was informed to the

forum that the tripping was

due to Relay problem.

(ii) Direct Transfer (D/T) trip

was there for both Main and

Tie CBs; It was informed

that the SF6 CB wiring was

modified

GI-2


(iii)It was also informed that

the NO and NC contacts

were sticky and the same

was rectified.

8

Tripping of 400kV

Madurai-

Thirunelveli line

16.10.2013

at 21:04

Hrs

Transient fault in

B-Phase. Line

failed to reclose

at Madurai end

It was informed that the

tripping was due to

maloperation of Relay and

the relay was replaced.

GI-2

9 400/220 kV ICT-2

at Gooty

06.10.2013

at 12:56

Hrs

As reported ICT

tripped on over

flux protection

(i) It was informed that the

Voltage went up to 270kV

and over flux relay operated.

(ii)PGCIL informed that

normally D/R is not wired to

ICTs and it is only for lines.

(iii)As there were no loads in

the downstream due to local

agitation, the system voltage

went up.

GI-2

10

Tripping of

400/220kV kV

ICT-2 at Chittoor

substation

06.10.2013

at 12:25

Hrs

As reported ICT

tripped on over

flux protection

As there were no loads in the

downstream due to local

agitation, the system voltage

went up.

GI-2

11

Tripping of 220kV

Ambewadi-Ponda

line-2

3.10.13 at

12:44 hrs Delayed fault

clearance

observed through

PMU data during

both in incidents

(i)KPTCL informed that the

Distance Protection

numerical Relay was faulty.

(ii) The Relay was replaced

with the new relay .DR to be

enabled

GI-1

12

Tripping of 220kV

Ambewadi-Ponda

line-2

22.10.2013

at 12:35

Hrs

6. New SPS Schemes proposed by NLDC

NLDC vide (i) Letter No NLDC /SR-Sync-SPS dated 18.11.2013 and (ii) Letter No NLDC /SR-Sync-SPS/Addendum dated 21.11.2013 proposed the following SPS schemes for the SR.

(i) Modification of Talcher Kolar SPS. (ii) Modification in Kudankulam SPS (iii) New SPS for 765 KV Sholapur Raichur section.


(iv) SPS for tripping one of 400 KV Hiriyur Nelamangala DC Line and flow on other line > 850 MW.

(v) SPS for tripping of one of the 400 KV Gooty Nelamangala SC Line or 400 KV Gooty - Somanahalli SC Line and flow on other line > 850 MW.

Deliberations

Modification in the Talcher Kolar SPS ,Modification in the Kudankulam SPS Scheme and the New SPS scheme for the 765 KV Sholapur Raichur line was discussed in the Sub Group meeting of PCSC and the PCSC meetings.

It was informed to the forum that the above SPS schemes were circulated to the constituents during the Sub Group meeting day and on the PCSC meeting day.

The SPS for Hiriyur Nelamangala and SPS for 400 KV Gooty Somanahalli were communicated to the constituents.

SRLDC informed that the SPS schemes as proposed by NLDC were vital for secure operation of the after synchronization of Southern Grid with New Grid over 765 KV Sholapur Raichur line.

SRLDC insisted for identification of 800 MW load (for Kudankulam SPS) and taking up the same immediately.

Recommendations

PCSC forum recommended for the expeditious commissioning of SPS schemes in the Southern Region for Secure operation of Grid after synchronization of SR with NEW Grid.

In the PCSC meeting it was agreed that the 800 MW additional loads (in the average ratio of Trip Signal I, Trip Signal II and Trip Signal III) by the SR constituents latest by 2nd December 2013.

The following time schedule was agreed upon:

o Identification of loads by constituents latest by 2nd December 2013.

o Trip Signal would be ready by 10th December 2013 o Integration with CTU signal would be ready by 15th December 2013

and o Mock testing of the Trip Signal would be carried out on 20th

December 2013 .

SRPC vide Lr No SRPC/2013/12363-77 dt 22.11.2013 informed the quantum of loads to be identified by the constituents (for 800 MW ) and the SPS Schemes proposed by NLDC and course of action to be taken by the respective constituents (Annexure VIII).

The PCSC forum requested the constituents to be in touch with SRLDC/CTU regarding the implementation of the SPS if any clarification needed in the implementing the same since the SPS schemes to be completed within the agreed time.

List of Task assigned to various agencies is enclosed in Annexure VIII-A.


7. Status of Pending Protection issues

The following pending protection issues were discussed in the 26th PCSC meeting.

7.1 Recommendation to be complied by November 2013

S

N

Recommendation The meeting

in which the

issue was

Discussed

Anticip

ated

date of

complet

ion

Agency Status 26th

PCSC

Deliberations

1 Relay/CVT error in 400

KV Kaiga-2 Line

24th PCSC

26.09.2013 )

Oct-13 KPTCL Attended KPTCL informed that

old CVT is replaced with

the new CVT on

08.11.2013.

2 The non availability of

220 KV and 400 KV bus

coupler is affecting the

reliability of 400/220

KV Guttur Substation

24th PCSC

(26.09.2013 )

Nov-13 KPTCL To be

Completed

Replacement of 400 kV

B/C and other CBs are

taken up.

3 DTOC settings for ICTs

to be removed and

IDMT settings to be

adopted.

21st

PCSC

(25.06.2013)

Nov-13 SRTS I,

PGCIL

Would be

completed

by the

month end

SRTS I, PGCIL

informed the corporate

approval was received

and complied with the

end of Nov 2013.

4 DG set not available-

Edamon

17th PCSC

(26.02.2013 )

Nov-13 KSEB Pending Tenders were floated

but no supplier has

quoted.

Re tendering was

started.

Would be completed by

Mar-2014

5 Carrier inter-tripping is

not available for SBEM

1,2,3 feeders-Edamon

17th PCSC

(26.02.2013 )

Nov-13 KSEB Completed Implemented.

6 Main2 distance

protection for EMPC#1

feeder not available-

Edamon

17th PCSC

(26.02.2013 )

Nov-13 KSEB Would be

completed.


the month end.

7 LBB not in service for

SBEM 2, 3 and EMPC

#1- Edamon

17th PCSC

(26.02.2013 )

Nov-13 KSEB Would be

completed.


the month end.

8 IDMT characteristics for

earth fault relay of the

GTs in UPCL

24th PCSC

26.09.2013 )

Nov-13 UPCL Would be

completed.


the month end.

9 At Mamidipally

synchronizing time hour

pulse with Ghanapur s/s

23rd PCSC

held on

27.08.2013

Nov-13 APTRA

NSCO

completed Aptransco informed that

the GPS was working.


7.2 Recommendation to be complied by December 2013

SN Recommendation The meeting in

which the issue

was Discussed

Anticipated

date of

completion

Agency Status 26th

PCSC

Deliberations

1 The Main I and

Main II Protection

of Different make-

Sharavathy

21st PCSC

held on

25.06.2013

Dec-13 KPCL Pending KPCL informed

that the protection

issue would be

sorted within the

agreed time.

2 Replacement of

OLD CBs at

Sharavathy

21st PCSC

held on

25.06.2013


that the protection

issue would be

sorted within the

agreed time.

3 COMPLIANACE

OF 3RD PARTY

AUDIT REPORT-

Sharavathy

17th PCSC -

25th PCSC

(26.02.2013 to

22.10.2013)


that the protection

issue would be

sorted within the

agreed time.

4 BUSBAR

PROTECTION AT

KAYATAR

110KV

SUBSTATION

21st PCSC

held on

25.06.2013

Dec-13 TANTR

ANSCO

Pending TANTRANSCO

informed that the

protection issue

would be sorted

within the agreed

time.

6 PROVIDING DR

AND EL-

MAMIDAPALY

23rd PCSC held

on 27.08.2013

Dec-13 APTRA

NSCO

Pending APTRANSCO

informed that the

protection issue

would be sorted

within the agreed

time.

7 48 V DC SUPPLY

REDUNDANCY

NOT

AVAILABLE-

EDAMON

17th PCSC

(26.02.2013 )

Dec-13 KSEB Pending KSEB informed

that the protection

issue would be

sorted within the

agreed time.

8 Modification of the

present breaker

tripping scheme of

Haveri line-2 so

that the trip coils

are activated

through two

different DC

sources

24th PCSC

(26.09.2013 )

Dec-13 KPTCL Pending KPTCL informed

that the protection

issue would be

sorted within the

agreed time.

9 NPCIL and

KPTCL in

coordination to

review the

protection settings

at Kaiga

24th PCSC

(26.09.2013 )

Dec-13 KPTCL Pending Would be

completed by

December end.


7.3 Recommendation to be complied by Mar 2014


which the issue

was Discussed

Anticipated

date of

completion

Agency Status 26th

PCSC

Deliberations

1 EARTH PITS at

EDAMON

17th PCSC

(26.02.2013 )

Mar-14 KSEB Pending KSEB informed

that the protection

issue would be

sorted within the

agreed time.

2 ONLY ONE BUS

IS AVAILABLE,

TRANSFER BUS

SHALL BE

PROVIDED-

EDAMON

17th PCSC

(26.02.2013 )

Mar-14 KSEB Pending KSEB informed

that the protection

issue would be

sorted within the

agreed time.

7.4 Recommendation to be complied by Aug 2014


which the issue

was Discussed

Anticipated

date of

completion

Agency Status 26th

PCSC

Deliberations

1 Synchronizing

Facility at Hubli.

17th PCSC

(26.02.2013 )

Aug-14 KPTCL Pending KPTCL informed

that the protection

issue would be

sorted within the

agreed time.

Deliberations

The PCSC forum requested the constituents to implement the above protection

committee recommendations on priority basis.

8. SPS for Kudankulam Nuclear Power Station

SRLDC brought to the notice of the PCSC forum that there had been re-

orientation recently in respect of 400 KV lines emanating from Kudankulam.

Three 400kV lines were now from Kudankulam to Thirunelveli while remaining

one line is from Kudankulam to Madurai. Hence the following logic was

proposed for SPS at Kudankulam on account of the change in the

configuration:

Contingency Action

Tripping of all three lines from

Kudankulam to Thirunelveli and two

units in running condition at Kudankulam.

One unit at Kudankulam to go on house load

and the second unit generation would be

evacuated through 400kV Kudankulam-

Madurai line.


26th PCSC Deliberations

NPCIL informed the forum that they have raised certain queries with the

CTU and waiting for their reply.

SRLDC informed the forum that the proposed SPS for Kudankulam

Generators was mainly as a preventive action in the interest of not losing

the NPCIL units.

PCSC forum requested NPCIL to implement the proposed SPS in

consultation with the CTU/SRLDC.

9. Review of Power swing block settings of Distance protection relay

Deliberations

The issue was discussed in detail in the Sub Group meeting of PCSC and the recommendations were laid in item 3.2

10. Phasing of Implementation of Protection Audit Recommendations

In the 23rd SRPC meeting held on 26th October 2013 it was agreed that the utilities to carry out implementation of the recommendations relating to

third party protection audit as per prioritization in a phased manner.

The schedule of activities would be furnished with in one month and would be discussed in the Protection sub committee meeting.

The utilities would commence works identified in the above schedule without waiting for funding.

Deliberations

CE (P&C), TANTRANSCO informed the PCSC forum that they had already started phasing of Protection Audit Recommendations in phases and the compliance regarding this would be sent at the earliest.

KSEB informed the forum that they were also in the process of phasing the Protection Audit recommendations and would be intimating the same.

KPTCL agreed to inform the same with in a month's time.

APTRANSCO informed the forum that they have already submitted the DPR. Phasing of works was yet to be carried out.

Member Secretary i/c, informed the forum that as per the decision in 23rd SRPC Meeting, the items included in the DPR (i.e. implementation of Protection Audit Recommendations) were to be prioritized in phases. He requested the cooperation of the utilities in early implementation of SRPC decision.


Puducherry was also requested to submit the phasing of implementation of Protection Audit recommendations.

Recommendations

PCSC form recommended for submitting the Phasing of implementation of the Protection Audit recommendation to SRPC secretariat latest by 19.12.2013.

11. Tripping Incidents in the Southern Region

The tripping details that had occurred in the Southern Region during the

month of October-November, 2013 is attached herewith as Annexure-IX.

Constituents were requested to update the details in the SRLDC Website at

the earliest to analyze the incidents and suggest remedial measures if any.

12. Status of implementation: SPS in Southern Region

S

N

Name of the

Scheme Details of the scheme

Impleme

nting

Agency

26th

PCSC

Deliberations

PCSC

Recommendations

1 Proposed

Modification in

the SPS at

Kolar SS

In the 16th

PCSC the forum

proposed an additional trip logic

(dp/dt )to the Kolar SPS during

contingencies similar to New

Grid disturbance on 31.07.2012

PGCIL PGCIL

informed that

the SPS is

under Process.

Would be

completed by

end November

2013.

The forum requested

PGCIL to complete

the modification

within the agreed

time.

2 Kudankulam

SPS

The Modification in the SPS as

proposed by NLDC discussed

vide item No 6.

PGCIL

/SR

Constitue

nts

800 MW

Loads has to

be identified

by the

constituents.

AP- 177 MW

Kar- 193 MW

Kerala- 132 MW

TN - 298 MW.

(In the Avg. Ratio of

TSI,TS IIand TS III)

3 Modification in

NTPC Talcher

SPS

NLDC has proposed for

medication in the SPS for secure

operation of Grid after

synchronization of SR with

NEW Grid .

NTPC/C

TU in

consultat

ion with

NLDC

and

SRLDC

Discussed

vide item No

6.

NTPC/CTU to

implement the SPS in

consultation with

NLDC and concerned

RLDCs as scheduled

in item No 6.

13. Status of implementation: SPS in Andhra Pradesh

S

N

Name of the


Impleme

nting

Agency

26th

PCSC

Deliberations

PCSC

Recommendations

1 Vijayawada-

Nellore SPS

if one of 400kV Vijayawada-

Nellore D/C line trips and before

tripping flow each circuit is

>550 MW then back down

generation or trip one generating

PGCIL ./

APTRA

NSCO/IP

Ps

PGCIL

informed that

the SPS was

ready.

APTRANSCO

The PCSC forum

decided to conduct

mock exercise on

30th November 2013.


unit each at GMR Vemagiri,

Gouthami, Konaseema,

Jegurupadu-II and Lanco.

Total generation back down of

430 MW. Proposed in 9th PCSC

(9.07.2010)

was requested

to coordinate

the Mock

exercise with

IPPs.

14. Status of implementation: SPS in Karnataka

S

N

Name of the


Impleme

nting

Agency

26th

PCSC

Deliberations

PCSC

Recommendations

1 Somanahally&

Bangalore

water supply

a) To trip all 220kV lines & 220

/ 66kV trfs except 220 kV

Harohalli & Tataguni lines at

Somanahally and to trip

Vrishabhavathi line at Tataguni

when ICTs at Somanahally trip.

b) To trip 220 kV Vajamangala

and Madhuvanahally-1 & 2 lines

at TK Hally when ICTs at

Mysore trip.

KPTCL

KPTCL

informed that

the Substation

feeding

configuration.

KPTCL is

modifying the

logic as per the

latest

configuration.

The PCSC forum

requested KPTCL to

submit the SPS Logic

to the SRPC

Secretariat.

15. Status of implementation: SPS in TamilNadu

S

N

Name of the


Impleme

nting

Agency

26th

PCSC

Deliberations

PCSC

Recommendation

s

1 Madurai SPS To avoid overloading of

Madurai ICTs.

TANTR

ANSCO

TANTRANSC

O informed that

the scheme

would be ready

by end of

November 2013.

The forum

requested

TANTRANSCO to

implement the

scheme within the

agreed time.

16. Implementation of Islanding schemes in SR

Deliberations

The PCSC forum requested TANTRANSCO to implement the remaining part

of Stage II of the Islanding Scheme at the earliest. Since the other utilities

had completed their part. TANTRANSCO agreed to complete their part by

the agreed time line of end November 2013..

17. The issue of AUFR stages and implementation in SR

In the second NPC Meeting, it had been agreed that there would be four

stages for AUFLS starting with 49.2 Hz. The various stages for AUFLS

operation are 49.2 Hz, 49 Hz, 48.8 Hz and 48.6 Hz.


Deliberations

It was noted that all the stages had been implemented except portion of

the last stage of 48.6 Hz in TN. TN was agreed to complete its portion by

the end of November 2013.

18. Submission of completed dynamic study data

Deliberations

All SLDCs were requested to direct the embedded IPPs connected at

220 KV and above voltage level to submit completed dynamic study

format to SRPC, Secretariat.

NPCIL, MAPS was requested to submit the dynamic study data of their

system.

19. Requirement of Under Voltage Relays (UVR) for SR

The PCSC forum had proposed for the provision of under voltage relays in various low voltage pockets to ensure reliable power supply and grid safety. (Annexure-X).

20. Implementation of recommendations of Grid Disturbance enquiry committee

The updated list of constituents sending the Healthiness of batteries is

enclosed herewith as (Annexure-XI).

The PCSC forum noticed that NPCIL, MAPS was not sending the data

even with the sufficient number of reminders and the issue would be

taken up in the higher forum for compliance.

21. It was agreed that any change in the system configuration etc ( LILO etc) are to be highlighted and brought to attention in the monthly PCC Meetings on a regular basis. This would enable utilities to take up any change in the relay settings on account of the revised configuration.

22. Date & Venue of the next Meeting

The 27th PCSC meeting would be conducted on 19.12.2013 (Thursday) at

SRPC Bangalore.

The 28th PCSC meeting is scheduled to be held in Toranagallu, Karnataka

on 24th January 2014 (Friday) and would be hosted by JSWEL.

Member Secretary i/c thanked all the Members & participants for their active

contribution in the Meeting.

*****

SOUTHERN REGIONAL POWER COMMITTEE · PDF fileheld on 21st November 2013 in the Conference Hall...

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