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Transcript of 83rd OCC Minutes Final
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North Eastern Regional Power Committee
MINUTES OF THE 83rdOPERATION COORDINATION SUB-COMMITTEE MEETING
OF NERPC
Date : 11/03/2013 (Monday)
Time : 10:30 hrs
Venue : The Classic Hotel, Imphal, Manipur.
The List of Participants in the 83 rd OCC Meeting is attached at Annexure I
The meeting was started with welcome address by Shri D. Chattopadhyay, General
Manager (O&M), NHPC. He stated that NHPC is honored to host the OCC meeting of
NERPC in Imphal as per roster. He mentioned about the importance of OCC
meeting where issues relating to system operation and overall development of the
region is being discussed. He requested all the participants to actively participate in
the discussion for fruitful outcome of the meeting. He wished all the participants a
comfortable stay in Imphal and then requested Member Secretary I/C to proceed
with the meeting.
Shri S. K. Ray Mohapatra, Member Secretary I/C, NERPC welcomed the
participants and thanked NHPC for hosting the meeting and for making the
excellent arrangement for comfortable stay of delegates. He informed the house that
after grid disturbance on 30th and 31st July, 2012, efforts are being made at
different levels to implement various recommendations of the enquiry committee to
avoid re-occurance of such incidences in future and to maintain grid discipline for
smooth and safe operation of the grid. Further, he stated that Protection Audit has
been completed in February, 2013, the report highlighting the deficiencies in NER
system along with recommendations and implementation plan is likely to be
submitted by March 2013. He also informed that due to non-availability of
generation from the GBPP of OTPC at Pallatana, the region is facing acute shortage
of power during this lean hydro period although problem of evacuation of power
from the GBPP has been solved after commissioning of 400KV Silchar Byrnihat
line in February, 2013. He wished that the technical problem with the machine will
be resolved soon and the generation from the OTPC plant will be resumed at the
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earliest for the benefit of the region. He requested constituents to co-operate with
NERLDC in real time operation for safe and secure operation of the grid.
Thereafter, Member Secretary I/C requested Shri B. Lyngkhoi, SE(O), NERPC to
take up the agenda items for discussion.
CONFIRMATION OF MINUTES OF 82 nd MEETING OF OPERATION SUB-COMMITTEE OF NERPC.
The minutes of 82nd meeting of Operation Sub-committee held on 7th February,
2013 at Shillong were circulated vide letter No. NERPC/OP/OCC/2013/2880-907
dated 15th February, 2013.
NEEPCO has requested for correction in the recording of minutes of 82nd OCC
meeting in respect of Item D.9 regarding RGMO installation in NEEPCO generating
stations. The status of Implementation of RGMO at NEEPCO Hydro Power Plants
as follows (AS ON 15.01.2013) on Item D.9 may be noted as below:
RanganadiHEP
3X135 MW
The type of Governor is G40. Existing EHG of the units are not
compatible for incorporating RGMO. Order for new microprocessor
based EHG incorporating restricted mode operation has already
been placed with the OEM, M/s BHEL on 30/03/2012.
Considering the lead time for delivery and transportation time, it
is expected that the system can be made operational in all units
by March, 2014 after erection/commissioning during lean hydro
season of 2013-14.
DoyangHEP-3X25MW
The type of Governor is G40. Existing EHG of the units are not
compatible for incorporating RGMO. Order for new microprocessor
based EHG incorporating restricted mode operation has already
been placed with the OEM, M/s BHEL on 10/10/2012.
Considering the delivery schedule of 8 months from date of order
& programming erection schedule during lean hydro season, it is
expected that the system can be made operational by March2014.
A. C O N F I R M A T I O N O F M I N U T E S
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Kopili
4X50 MW
The type of Governor is G40 in all the units of KHEP. Existing
Governors of the power Stations are not compatible for
incorporation of RGMO.
For 50 MW Unit-I & II of the Kopili Power Station, new Governor
system has been placed with OEM along with R&M package in
March2011. Equipments received at site recently. Erection
/commissioning will be carried out during R&M works as
scheduled in the lean hydro season of 2013-14. Expected date of
commissioning of the system is by March2014.
Khandong2X25 MW
For 50 MW Kopili Unit-III, Unit-IV & Khandong 2X25 MW units,
as the existing governing system are not compatible for RGMO
operation; The matter has been taken up with BHEL, who is theOEM for the system. On receipt of financial offer from BHEL, order
shall be processed for the system. It is expected that the system
can be commissioned by March2014.
Kopili Stg-II
1x25 MW
The existing governor of 25 MW Stage-II PH is microprocessor
based. However, for RGMO, the necessary software has to be
loaded in the system. Offer from OEM already received and under
process for placement of order. Expected date of commissioning isby March2013.
In place of
On RHEP- RGMO installed; Khandong/Kopili- Extension till March, 2014 has been
requested from CERC.
Wi t h t h e a b ov e c o r r ec t i o n s , t h e m i n u t es o f 8 2 n d O CC m eet i n g w a s co n f i r m ed .
SE (O), NERPC then requested NERLDC to give the presentation on 1) ATC/ TTC
Calculation 2) Special Protection Scheme of Pallatana evacuation 3) The grid
performance of NER during the month of February, 2013. The presentations are
enclosed at Annexure-A.
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I T E M S F O R D I S C U S S I O N
B.1. OPERATIONAL PERFORMANCE AND GRID DISCIPLINE DURING FEB 2013
As per the data made available by NERLDC, the grid performance parameters for
February, 2013 are given below:
i) Average frequency during February, 2013 was 50.09 Hz as compared to 50.01
Hz in January, 2013.
ii) Minimum frequency in February, 2013 was 49.40 Hz (22.02.13 at 06:50 hrs) as
compared to 49.30 Hz Hz recorded in the previous month.
iii)
Maximum frequency was 50.71 Hz (16.02.13 at 23:59 hrs) as compared to 50.78Hz recorded in January, 2013.
iv) System frequency remained within permissible range of 49.7 Hz to 50.2 Hz for
80.00 % of the time, below 49.7 Hz for 4.89 % and above 50.2 Hz for 18.68 % of
the time as compared to 83.12 %, 5.57 % and 11.31 % respectively in the
previous month.
v) Regional peak demand in February, 2013 was 1934 MW as compared to 1943
MW in January, 2013, a decrease of 0.46 % over the previous month.
vi) Regional peak availability was 1845 MW as compared to 1815 MW in previousmonth, an increase of 1.65 % over the previous month.
vii) Energy requirement was 876.43 MUs in February, 2013 compared to 991.54
MUs in January, 2013, a decrease of 11.62 % over the previous month.
viii) Regional energy availability was 818.37 MUs compared to 924.82 MUs in the
previous month, a decrease of 11.51% over the previous month.
ix) Rise in demand met was recorded in Tripura (8.59%), Meghalaya (6.45%) & Ar.
Pradesh (3.81%) over the previous month.
x) Drop in demand met was recorded in Nagaland (8.42%), Assam (5.69%),
Manipur (5.08%) & Mizoram (4.29%) over the previous month viz. January, 2013.
xi) Over Voltage observed at Misa S/S (422kV).
xii) No over Voltages were observed at 220kV & 132 kV S/S.
xiii) No under Voltages were observed at 400 kV S/S, 220 kV S/S & 132kV S/S.
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xiv) Regional Generation & Inter-regional Exchanges during the month of
February, 2013 compared to January, 2013 are given below:
SN Parameter February, 2013 January, 2013
REGIONAL GENERATION & INTER REGIONAL EXCHANGES (in MU)
1 Total Generation in NER (Gross) 552.454 687.508
2Total Central Sector Generation
(Gross) 314.987 419.115
Total State Sector Generation (Gross) 237.467 268.393
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Inter-Regional Energy Exchanges (a) NER - ER 4.22 6.02(b) ER - NER 283.22 268.36
(c) Net Import 279.00 262.34
The Summary of Category A, B, C Messages issued by NERLDC for the constituents
of NER for the Month of January, 2013 is given as below:
State
A
(
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FOLLOW UP ACTION
C.1 Synchronization of Pallatana Module -I
During 79 th OCC meeting, AGM, NERLDC informed that OTPC had synchronized
their machine and generated around 30 MW during Durga Puja which was of great
help to NER grid during puja.
During 79 th OCC meeting, GM, OTPC had informed that to ensure capability of
plant and various equipment, auxiliaries & ancillaries associated with Block-1 /
Unit-1 of Pallatana Generating station, trial operation is required with increase of
loads in steps as per schedule and after unit stabilization run, machine needs to be
run at full / base load and the continuous run of unit for minimum period of 72
hours is required for declaration of COD. SE(Com) informed that for declaration of
COD, the running of machine continuously for 72 Hrs is not a mandatory
requirement. But as per PPA of OTPC with the constituent states of NER, each
block/unit is to operate seventy two (72) consecutive hours at or above 95% of the
contracted capacity. OTPC had informed that after running of Block-1
continuously for 72hrs. at full / base load, the machine could be run at reduced
load for fifteen (15) days. The running of Unit at full / base load is required to
demonstrate gross generation, heat rate, auxiliary consumption, and NOX level
including capability & reliability of various equipment, auxiliaries, ancillaries and
associated control and protection system.
AGM, NERLDC stated that all tests required for commissioning of Pallatana U#1
will be facilitated by NERLDC as agreed in previous OCC meetings but the
commercial issues with the stake holders i.e. NEEPCO/NHPC/Tripura have to be
settled by OTPC.
POWERGRID informed that 400 kV Silchar- Pallatana-II tripped number of times on
07/11/12 on overvoltage due to some problem at OTPC end, the same needs to be
checked.
OTPC informed that the investigation is going on and it will be rectified soon.
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NERLDC also informed that as per the previous decision in OCC meeting all
constituents had agreed for 72 hours of continuous run of Palltana U#1 at full load
(i.e. 300 MW). For evacuation of full generation of Pallatana U#1, Tripura, Assam,
NEEPCo and NHPC have to back down their generation. Therefore, if OTPC requires
continuous load more than 72 hours (3 days), all constituents should agree forsuch transaction and the commercial issues also needs to be resolved beforehand.
NERPC had given a presentation on the commercial implication of backing down of
generation by NHPC, NEEPCO, Tripura, and Mizoram due to injection of generation
by Unit-1 of Pallatana taking into account the previous load flow study on case to
case basis.
Assam stated that backing down of generation may be allowed, but frequentramping up/down of generation is not desirable as it may lead to cascading effect
resulting in a grid disturbance. Further they stated that the generation status at
Pallatana should be integrated with the SCADA system of all SLDCs.
Tripura also stated that the commercial implication should be settled beforehand.
NEEPCO also informed that for running of Unit-1 for more than 72 hours, prior
approval from their management would be required. NEEPCO requested for steadyinjection of power for the whole day to manage their gas supply. OTPC informed
that it is difficult to maintain steady injection of power to the grid during trial
operation.
OTPC informed that since all constituents are not agreeing for full load generation
for 15 days, reduced generation of 250-280MW may be allowed after continuous
run of Unit-1 for 72 hrs. at full / base load.
During discussion POWERGRID was requested to inform the committee about the
present status of 400kV Silchar Byrnihat line and the 400kV substation at
Byrnihat. Committee requested for commissioning of line and substation by the end
of November 2012. But POWERGRID informed that it is difficult to commission the
GIS substation before December 2012.
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In the 79 th OCC meeting, after detailed deliberation the committee reiterated its
earlier decision to allow continuous run of the Unit-1 for 72 hours at full load.
Further OTPC should furnish its schedule at least 48Hrs beforehand to enable all
the stake holders to carry out proper planning. However, the commercial matter
regarding running of Unit-1 beyond 72 hours at full / reduced load needs to be
discussed in commercial committee and NERPC meeting to settle the commercial
implications.
During 80 th OCC meeting, Committee requested POWERGRID to inform the house
about the status of 400kV Silchar Byrnihat line and the 400kV substation at
Byrnihat. POWERGRID informed the committee that the stringing work of 400kV
Silchar Byrnihat line is under progress and is likely to be completed by January,
2013. Regarding 400kV GIS substation at Byrnihat it was informed that Reactor oilfilteration is in progress and one transformer has also reached the site. The pre-
commissioning tests will be completed as early as possible. The commissioning of
400kV GIS cannot be completed before January, 2013 although most of the
erection commissioning activities on 220kV side will be completed by December,
2012.
GM (Plant), OTPC informed that synchronization of Unit -1 would be done again on
14.12.12 for further tests and COD and submitted the schedule to NERLDC. Thecommittee deliberated the generation schedule of OTPC Pallatana w.e.f. 14.12.12
and after detail discussion it was decided that:
i) On 14.12.12 OTPC should synchronize Unit-1 before Peak Hours (i.e. 17:00
Hrs) and the generation should be in the range of 50 to 80 MW so that it will
help NER grid during Peak hours and moreover, start-up power should be
drawn from the Grid during off-peak hours, which will help the TSECL system.
Afterwards the load may be increased gradually.
ii) On 15.12.12 OTPC should plan to generate about 300 MW (for 2 hours) during
Peak hours so that such quantum of generation can be easily accommodated.
iii) From 15.12.12 to 24.12.12 OTPC should generate around 230 to 250 MW
continuously. However, the generation needs to be rescheduled, if required,
depending on real time grid conditions and as per the advice of NERLDC.
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iv) If OTPCs generation would be found to be stable, then generation of 230 to 250
MW can be continued further till 02.01.2013 to support the grid during
Christmas and New Year eve.
v) From 03.01.2013 onwards, OTPC may plan for generation of 363 MW (full
load/base load) continuously for 72 hours in consultation with NERLDC.
During 81 st OCC meeting, the Sub-committee enquired about the status of
commissioning of Unit#2 of GBPP at Palatana from OTPC and also the status of the
ATS from POWERGRID.
OTPC informed that the commissioning schedule of Pallatana U#2 is May/June,
2013. Further, OTPC requested to facilitate for following schedule of generation.
i) Generation of 300 MW for 4-5 hours on 11.01.2013 for DLN testing
ii) Continuous Generation of 250 MW for seven (7) days for trial operation.iii) Generation of 360 MW for three (3) days to meet the requirement of COD.
POWERGRID informed that the commissioning schedule of ATS is as follow:
a) 400 kV Silchar Byrnihat Transmission line By end of January, 2013
b) 400 kV GIS Byrnihat S/S- By end of January, 2013
c) 400 kV Byrnihat Bongaigaon Transmission line By May/June, 2013.
TSECL and Assam representatives requested NERLDC not to issue ATC violation
message as States were overdrawing continuously to match the load requirement
with generation from OTPC. They also requested for some action to avoid UI drawl
at higher rate as it effects commercially.
After detailed deliberation the committee decided that:
i) On 11.01.2013 OTPC will inject 300 MW for five (5) hours during peak hours
to perform the DLN testing.
ii) Subsequently generation of OTPC will be restricted to 250 MW during peak
hours and 150 MW during off-peak hours till 400 kV Byrnihat S/S and 400
kV Silchar Byrnihat line is commissioned.
iii) However, in case of any contingency, OTPC will have to back down generation
as per advice of NERLDC.
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During the 82 nd OCC meeting, GM (Plant), OTPC informed that DLN tuning in PPM
mode has been completed for generating Unit#1 at Palatana. But the DLN tuning in
PM mode is yet to be done. For DLN tuning in PM mode, load of about 300MW
would be required and after DLN tuning, load of about 250 MW is required
continuously for further trial run of the machine.
POWERGRID was requested to intimate the status of commissioning transmissionsystem associated with evacuation of power from generating units of OTPC at
Pallatana and NTPC at Bongaigaon. POWERGRID informed that the status of
transmission system is as below:
i) 400 kV Silchar Byrnihat Transmission line By February 15, 2013
ii) 400 kV GIS Byrnihat S/S- Charged on January 5, 2013.
iii) 400 kV Byrnihat Bongaigaon Transmission line By June, 2013.
NERLDC presented the recent trippings and shut down programme of OTPC
generating unit during trail operation. The committee requested OTPC to stabilize
their machine as the records of NERLDC shows the machine is not stable and it is
tripping during trial operation and shut down is being taken now and then. Since
the NER grid may not be able to survive in case of tripping of generating unit of
such capacity (363MW) as it may lead to cascade trippings. The machine should be
stabilized before going for trial run with full generation.
After detailed deliberation the committee has decided as follows:i) The generating Unit#1 of OTPC should be stabilized as tripping of the
machine at full load may cause grid disturbance.
ii) Because of election in the state of Tripura on February 14, 2013, trail
operation of machine with full generation may be deferred till 400 kV Silchar-
Byrnihat line is ready in order to avoid interruption of power supply.
iii) The commissioning of 400 kV Silchar-Byrnihat line is expected by
January15, 2013 and trial run of OTPC machine with full generation can be
carried out after 15 th February, 2013.
D el i b er a t i o n o f t h e Co m m i t t e e
POWERGRID informed that the status of transmission system is as below:
i) 400 kV Silchar Byrnihat Transmission line Charged on March 26, 2013
ii) 400 kV GIS Byrnihat S/S- Charged on January 5, 2013.
iii) 400 kV Byrnihat Bongaigaon Transmission line By June, 2013.
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GM (Plant), OTPC informed that due technical problem with Unit # 1, the
generation from the plant has been stopped. The interior shields of Steam Re-
heating Boiler of Unit#1 are defective causing melting down of the metals and the
same needs replacement. Attempt will be made to divert the shields designed for
Unit-II to be used for Unit-I so that Unit-I can resume generation by 5th of May
2013.
The committee also informed that since six month period from the commencement
of injection of power to the grid will be over in April 2013, injection of firm power
into the grid will not be possible by OTPC after April as per CERC norm. OTPC was
requested to take up the matter with CERC so that power can be injected into the
grid when the machine is ready for generation in May 2013.
T h e Su b -c o m m i t t ee n o t e d a s a b o v e.
C.2 Independent third party audit of protection system and self-certification inrespect of operationalisation of Under Frequency Relay (UFR) and df/dtrelay
The Chairperson, CEA vide his D.O letter No. 7/AI/GD/GM/2012/397-407,
addressed to Honble Chairperson, NERPC had requested for completion of
independent third party audit of protection system and to ensure operationalisation
of Under Frequency Relay (UFR) and df/dt relay based automatic load shedding
within one month. In response to above letter NERPC vide letter No.NERPC/OP/OCC/2012/5687-702 had circulated extract of CEA & CERC
regulation and some formats, with typical example (which can be downloaded from
NERPC website), to help in collecting various information. No. of groups need to be
formed to carry out the protection audit. The action plan needs to be discussed so
that the work can be completed as early as possible.
However, the self-certification (by STUs / CTU) in respect of operationalisation of
Under Frequency Relay (UFR) and df/dt relay based automatic load shedding mayplease be submitted in the prescribed format to NERPC and CEA at the earliest.
During 79 th OCC meeting, SE (Comml), NERPC informed that as recommended by
Enquiry Committee, the third party independent audit for the Protection systems in
NER is to be completed as early as possible and presently Ministry of Power and
CEA are also monitoring the progress in various regions it very closely. Therefore,
for the benefit of the NER, the upgradation of protection system is very much
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required for smooth and reliable operation of grid and action should be initiated at
the earliest. Further, he informed that third party independent audit of Protection
systems for Northern region has already been completed by PGCIL in association
with CPRI and other regions have also started their action plan. He informed that in
NER there are about 135 Nos. of substations/ generating stations of 132kV and
above voltage class and also proposed to carryout protection audit for all these
substations / generating stations as 132kV system forms the backbone of NER
unlike other regions. Since arrangement of funds is the major constraint in NE
region, small groups /teams have to be formed taking representation from NER
constituents. The committee decided to form teams comprising of four (4) members
from different state utilities/owner, PGCIL/NEEPCO/NHPC and NERPC/NERLDC.
NERPC will co-ordinate the audit and prepare the further course of action in
consultation with NERLDC and POWERGRID. The nominated member of
NERPC/NERLDC will be the co-ordinator of each group.
Further, NERPC, in consultation with POWERGRID and NERLDC, had prepared the
detailed plan for carrying out the audit of protection system of all 132 kV and above
voltage class substations/generating stations in NER. NERPC vide letter dated 26 th
November, 2012 and 30 th November, 2012 had requested PGCIL and other
constituents to provide logistic support inform of road transport and stay at various
places in NER.
During 80 th OCC meeting, Member Secretary I/C, NERPC informed that ED,
POWERGRID has agreed to provide required support for carrying out the audit of
protection system. He also informed that the protection audit for Tripura is likely to
be completed before Christmas and from second week of January, 2013, other
teams will proceed for the audit and entire audit is likely to be completed by
February, 2013. Further, he requested all the constituents to nominate their
representatives for the audit.
Assam submitted their nominations for audit team. Other constituents agreed tonominate their persons for audit team. After detail deliberation all the constituents
agreed to the proposed dates and to extend their supports to complete the audit in
time bound manner.
During 81 st OCC meeting, MS I/C informed that Protection Audit of most of the
substations/generating stations in the state of Tripura had been completed. He
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requested all the constituents to extend their supports to complete the audit by
February 2013 as per Schedule.
The Committee reviewed the status of the Protection Audit and requested each
Audit team to prepare a report on findings / observations pertaining to various
substations / generating stations audited by them.
MS I/C, NERPC informed that as per the planning out of nine (9) routes identified
the audit of protection system pertaining to route no. 1, 4, 6, 7 and 8 have been
completed and presently audit in respect of route no. 2 and 5 is going on which will
be completed by 11 th February, 2013. These routes cover most of the
400/220/132kV Sub-Stations and Generating stations in Ar. Pradesh, Assam,
Manipur, Mizoram, Nagaland and Tripura. The audit of rest of two (2) routes (route
no. 3 and 9) will commence from 11 th February, 2013. Further, he stated that as on
date protection audit in respect of about 100 substations / generating stations hasbeen completed and rest of the work is likely to be completed by February, 2013.
After completion of protection audit, the deficiencies in the NER system will be
highlighted and discussed in OCC/PCC meetings. The course of action and time
frame of implementation of recommendations of protection audit will be planned
accordingly. The report on Protection audit along with recommendations will be
submitted by March, 2013.
D el i b er a t i o n o f t h e Co m m i t t e e
MS I/C, NERPC briefed the members about the deficiencies observed in some of the
audited sub-stations and highlighted the inadequacy of diagnostic tools in most of
the stations. As reported by auditing team, details of relay setting are also not
available with operating personnel of some of the substations which should have
been available with them as the core of protection lies in the relay settings. The
formats of reports were also highlighted to the members for perusal.
GM, NERLDC suggested that shortage of man-power may also be highlighted in the
reports as round the clock manning of sub-stations is very important for effective
and efficient management of the systems.
T h e Su b -c o m m i t t ee n o t e d a s a b o v e.
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C.3 Details of Installations and self-certification (by STUs and CTUs) in respectof operationalisation of Under Frequency Relays (UFRs) in NER systems andadditional requirement of UFR and df/dt relays:
During 79 th OCC, Manipur had informed that the UFRs have been installed on 33
kV Yurembum-Limukhong radial feeder as advised by the committee. In the
process installation of all UFRs in the NER has been completed as per earlier
decision of the committee. Further all constituents (STUs and CTUs) were
requested to furnish the relevant information in the format prescribed by CEA. It
was also discussed that the requirement of UFR and df/dt relays need to be
reviewed based on the recommendation of the enquiry Committee constituted by
the Ministry of Power headed by Chairperson CEA.
During 80 th OCC meeting, MS (I/C) informed that after the grid disturbance, the
Ministry of Power and CEA are closely monitoring the progress in implementation
of recommendations of Enquiry Committee. CEA is also asking the operation
details of UFRs every now and then. Therefore, all constituents are requested to
submit the requisite data at the earliest. Constituents, who have not submitted the
required information, have agreed to submit the same at the earliest. Further, he
informed that the frequency band has been tightened further by CERC to 49.7 to
50.2, therefore the frequency settings and load relief is further required to be
reviewed.
During the 81 st OCC meeting, NERLDC informed that the Committee for Security
of grid constituted by Ministry of Power has revised the quantum of under
frequency based load shedding at various frequency bands. Therefore, the under
frequency based load shedding in respect of NER needs to be reviewed.
The Committee requested NERPC to finalize the UFR based load shedding in
consultation with NERLDC. However, for finalization of UFR based load shedding,
further detailed discussion would be required.
During the 82 nd OCC meeting, SE (O), NERPC enquired from constituents whether
the UFRs installed in the region have operated during the recent grid disturbances
occurred on 14.12.2012 & 20.01.2013. He requested all the constituents to
furnish the details of UFR operation. All constituents agreed.
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As per clause no. 5.2(n) of IEGC, utilities are to submit UFR operation report on
monthly basis to RPC. All constituent states are requested to inform the committee
about the operation of UFR since its commissioning, particularly during grid
disturbances, which is being monitored strictly by CEA/MoP after the grid
disturbances on 30th & 31st July, 2012. The UFR operation detail may please be
furnished to RLDC and NERPC as per format circulated.
All constituents agreed to submit the data in the prescribed format.
The Committee also suggested that if UFR operation can be linked to annunciation
on control panel, then operation of UFR can be easily recorded.
D el i b er a t i o n o f t h e Co m m i t t e e
After deliberation, it was agreed that whenever sub-stations are upgraded or
renovated, possibility of installing automated control panels should be explored so
that reports on operation of UFR and other technical details may be recorded and
collected efficiently at regional level.
S.E (O) requested all the Constituents to submit the report of UFR operation every
month as per the format circulated by NERPC and if no operation has taken place
then a NIL report maybe submitted so that the same can be circulated with the
minutes of the meeting.
The constituents requested to discuss the issue in detail during the forthcoming
PCC Meeting.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
C.4 Lines under long outages
During 80 th OCC meeting, the status of lines which are under long outages as given
below were reiterated
(a) 220kV BTPS Agia (one ckt) since Novemeber, 1997
(b) 132kV Mariani Mokokchung since April, 2008.
(c) 39km of 132kV Rengpang Jirbam since October, 2002
(d) 132 kV Dimapur-Dimapur-II
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Assam representatives informed about 220 kV BTPS-Agia- II that it is under
stringing stage and it was delayed as the tender was terminated because
contractor cannot complete the said job in time. The new tendering is in progress
and it will be completed at the earliest. Regarding Mariani-Mokokchung line the
Assam side is ready; the Nagaland side is required to be checked.
Regarding 132 kV Rengpang-Jiribam line the Manipur representatives informed
that the work is in progress and the same will be completed by January, 2013.
Further, NERLDC informed that the Dimapur-Dimapur-II is also under long
outage.
The committee requested NERPC to take up the matter with the concerned State
for early restoration of these lines for better grid operation.
During the 81 st OCC meeting, Assam informed that 220 kV BTPS-Agia will be
restored by September, 2013.
Manipur informed that commissioning of 132 kV Rengpang-Jiribam line will be
completed by January, 2013.
The Committee requested NERPC to take up the matter with Nagaland.
In response to NERPCs letter dated 14-12-2012, CE, Nagaland, vide his letterdated 21 st January 2013, have informed that the portion of 132kV Mokokchung
Mariani line (under the jurisdiction of Nagaland) has been kept charged at 33kV
and can be charged at 132kV at any point of time provided portion of line in Assam
is ready. With regard to 132kV Dimapur (PG) Dimapur (N), in a joint meeting on
16-01-13, it has been decided that POWERGRID, Dimapur will discuss the matter
regarding operation procedure with DoP, Nagaland.
The status as reviewed in the meeting are as under:
(a) 220kV BTPS Agia (one ckt) Assam informed that the tender has been opened
and same is under technical evaluation.
(b) 132kV Mariani Mokokchung Assam and Nagaland to co-ordinate and bring
back the line by February, 2013.
(c) 39km of 132kV Rengpang Jirbam Manipur informed that stringing for 5 km
section is left out and the same is likely to be completed by February 2013.
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(d) 132 kV Dimapur-Dimapur-II POWERGRID to co-ordinate with Nagaland and
discuss operation issues before election (i.e. 23.02.2013)
D el i b er a t i o n o f t h e Co m m i t t e e
(a) 220kV BTPS Agia (one ckt) Tender has already been opened and order islikely to be placed by April, 2013
(b) 132kV Mariani Mokokchung CGM (SLDC), AEGCL informed that the line
was charged but tripped immediately after charging due to faults in some
portion of the lines under Nagaland. He requested NERPC to pursue with
Nagaland officials for joint inspection.
(c) 39km of 132kV Rengpang Jiribam Manipur informed that stringing is
almost complete and the same is likely to be completed by March 2013.
(d) 132 kV Dimapur - Dimapur - II POWERGRID informed that Nagaland hasagreed to the proposals made by them and the issue will be resolved soon.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
C.5 SPS scheme for Pallatana
It was observed from load flow studies carried out by NERLDC that tripping of
Pallatana unit during peak hours would cause loading of Kopili ICT (160 MVA). To
save the situation shedding of around 100 MW of load would be required in the
132 KV pocket through SPS.
During 76 th OCC meeting, DGM, NERLDC had informed that a special protection
scheme is required to be planned for shedding the above load. The committee
advised NERPC Secretariat to design the SPS in consultation with NERLDC,
Assam, Meghalaya, Tripura, NEEPCO, NHPC and OTPC.
POWERGRID representatives had informed that not only SPS but protectionschemes are also required to be reviewed before commissioning of Pallatana GBPP.
From the load flow study it was observed that in certain lines there will be reverse
flow of power due to tripping of Pallatana.
The committee had requested POWERGRID to study the protection schemes and
prepare a report. The same will be discussed in the next OCC meeting.
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During 77 th OCC meeting, DGM, NERLDC stated that in case of tripping of
Pallatana unit, around 120 MW load shedding through SPS would be required in
Mizoram, Tripura and South Assam (each 40 MW) and some load shedding would
be required in Meghalaya. POWERGRID informed that the implementation of SPS
for tripping of far off lines/loads will be difficult as there will be co-ordination
problem because of non-availability of communication links and NERLDC should
find some other nearby lines or SPS can be linked with Kopili ICT. NERLDC
informed that they have identified the list of radial lines in NER system for
disconnecting during emergency conditions to save the grid. They pointed out that
the SPS can be implemented on those lines which are available in 132 kV Pocket.
All the constituents agreed for implementation of SPS on these lines and also for
emergency disconnection of listed lines in case of necessity.
The committee felt that the SPS scheme is required to be in place at least before
the synchronization of Pallatana unit. After detailed deliberation committee
requested NERLDC to prepare the SPS scheme of Pallatana in consultation with
NERPC and POWERGRID.
During 79 th OCC meeting, NERLDC informed that lines have been identified in
NER system for disconnection during emergency conditions to save the grid. SPS
can be planned accordingly. The committee requested NERLDC to give the list of
lines associated with tripping of Unit-1 at Pallatana and POWERGRID was
requested to plan the implementation of the SPS scheme.
During 80 th OCC meeting, the committee felt that NERPC, NERLDC and
POWERGRID may discuss the matter and plan accordingly for implementation of
SPS scheme.
NERLDC gave a presentation on grid security for tripping of i) 400 kV Silchar-
Killing (Byrnihat) line and ii) Palatana Units. The handout of the slides is enclosed
at Annexure- C.5 .
During 82nd OCC meeting NERLDC requested for creation of Power system study
group as per recommendation of enquiry committee for Grid disturbance. The sub-
committee had agreed for the same. The matter was also brought to the notice of
members of TCC and the TCC has also agreed for creation of Power system study
group in the region taking representation from various constituent states,
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POWERGRID, NERLDC, NTPC, NEEPCO, NHPC, OTPC and IIT Guwahati. The
studies relating to islanding scheme, SPS and any other studies required from time
to time can be carried out by the group. The group will not only help for studies on
regional basic but will of great help to each state for their planning studies. All
members were requested for nominations to the group.
D el i b er a t i o n o f t h e Co m m i t t e e
The System Protection Scheme (SPS) associated with tripping of generating unit of
OTPC at Pallatana or tripping of 400 kV Silchar-Byrnihat line, prepared by
NERLDC, was deliberated during the presentation given by GM, NERLDC. GM,
NERLDC emphasized that implementation of the SPS is essential to maintain grid
security under above contingency conditions. The tripping of above generating unit
or 400kV line may cause grid disturbance which may even lead to grid collapse.
The scheme involves immediate tripping of few identified lines at 132kV level
within two hops from the Silchar bus. It was agreed that the scheme will require
carrier inter-tripping provision for effective load shedding.
DGM, NERTS informed that the existing PLCC channels are fully utilized and there
is no spare channel for such carrier inter-tripping and new channels need to be
established additionally.
It was agreed that NERTS would examine the scheme in details and would initiate
necessary action for successful implementation of the proposed protection scheme
at the earliest possible time and the status of implementation plan would be
reviewed in next OCC meeting. In 82nd OCC meeting and special TCC meeting, it
was decided to create Power system study group in the region taking
representation from various constituents including IIT (Guwahati) and nomination
was also requested. Regarding nomination for system study group, the following
points are noted:
Ar. Pradesh - Nomination will be intimated at the earliest.
Assam Nomination will be intimated in coming PCC meeting.
Manipur - Nomination will be intimated within a week.
Meghalaya - Nomination already furnished
Tripura - Nomination will be intimated within a week.
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NEEPCO - Nomination will be intimated soon.
NERLDC Nomination will be intimated soon
NERTS Nomination already given
OTPC Nomination will be intimated soon
Mizoram & Nagaland representative were not present, NERPC will take up the
matter with them.
IIT, Guwahaty nomination will be taken up by NERPC Secretariat.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
C.6 Implementation of islanding scheme in NER
For survival of different parts/pockets (with identified generation along with some
load) of NER grid in the event of grid disturbance, islanding schemes are required
to be planned properly & implemented.
DGM, NERLDC stated that some islanding schemes need to be planned so that the
islands survive during any grid disturbance so that start-up power can be
extended to other generating stations.
During 77 th OCC meeting, the islanding scheme for NER was discussed in detail
for separating of NER system from NEW grid and forming of islands in NER. Two
proposals for islanding scheme were discussed.
In both proposals, first step is isolation of NER from NEW Grid at a particular
frequency by tripping of 400kV D/C line and 220kV D/C line connecting ER and
NER. In one case it has been proposed for formation of two Sustainable Small
System (SSS) and then Unit islanding and ultimately Safe shutdown of Generating
units when frequency falls to different levels. The frequency level at which actions
are to be initiated is to be finalized after discussion.
The Committee requested all the constituents to study the islanding schemes and
communicate their comments/suggestions at the earliest so that the islanding
scheme for NER can be finalized.
Further, DGM, NERLDC informed that the list of radial lines in NER system, which
can be tripped during emergency to save the grid, have been identified. During
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emergency there may not be time to co-ordinate with SLDC (like written message
etc.) before taking such action. However, formal communication shall be made by
NERLDC afterwards.
During 79 th OCC meeting, the committee felt that further study is required before
finalizing the islanding scheme for NER. The committee requested all the NER
constituents to study their systems and give suggestions/comments, if any before
finalization of the same. All constituents agreed.
During 80 th OCC meeting, MS I/C stated that the frequency level at which actions
are to be initiated, location of UFR & df/dt relays and communication link required
etc. needs to be studied for implementation of islanding scheme. The committee
suggested that NERPC, NERLDC and POWERGRID may discuss and plan
accordingly for implementation.
MS (I/C) informed that as per the minutes of the second meeting of Task Force for
Power System Analysis Under Contingencies under the Chairmanship of ex-
Member (PS), CEA, the number of small islands may not be the optimum solution.
Further, he informed that as NER grid is a small grid, so the Task force may
consider NER as a single island. Therefore, few numbers of island scheme for NER
grid should be considered to avoid operational difficulty.
SE(O), NERPC suggested that NER system may be divided into two islands,
however, further studies and discussion would be required for finalizing the
scheme.
GM, NERLDC also stated that further studies are required for planning and
implementation of the scheme.
The committee requested NERLDC and NERPC to study the system and prepare
final islanding scheme requiring minimum number of line opening and keeping in
view the system operation as well as implementation aspects.
D el i b er a t i o n o f t h e Co m m i t t e e
The study group mentioned in item C.6 above will look into the matter and the
same will be reviewed in OCC/PCC meetings.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
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C.7 Loadability Enhancement of 132KV Transmission lines:
NERLDC has requested POWERGRID, vide their letter No.NERLDC/GM/547 dtd
14.11.2012 for enhancement of loading capacity of the following lines:
a) 132KV S/c Badarpur-Khliehriat Line
b) 132KV S/c Loktak-Jiribam-II Line
c) 132KV S/c Dimapur-Imphal Line
d) 132KV S/c Imphal-Loktak-II Line
NERLDC has stated that enhancement of loading capacity of the above lines is
required for higher load dispatch, particularly in the context of evacuation of power
from Pallatana GBPP.
Accordingly, POWERGRID has already taken the following actions for increased
loadability:
Upgradation of existing CTs
Upgradation of the terminal CTs of 132KV S/C Loktak-Jiribam_II line, 132KV S/c
Dimapur-Imphal line is being taken up by POWERGRID for which the required
number of CTs of higher capacity (600/1) had already been ordered by
POWERGRID & subsequently dispatched from the manufacturer premises in the
month of July-12. However, 10Nos. CTs were damaged during transit. The matter
has been taken up with the concerned manufacturer for replenishment of the
damaged CTs. The new CTs expected to arrive at site by January13.
Installation of the same shall be carried out on arrival of the new CTs. As for 132KV
Badarpur-Khliehriat line, the terminal CTs installed are of 600/1 capacity.
During 80 th OCC meeting, NERLDC requested to include following lines for
enhancement of loading capacity:
i) 132 kV Khandong- Khlerehiet I
ii) 132 kV Khandong - Haflong
The committee requested POWERGRID to complete the CT replacement of the
above lines at the earliest to increase the loadability of these lines.
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During 81 st OCC meeting POWERGRID informed that the Khandong end CTs are
having ratio of 300/1 which belongs to NEEPCO. The committee requested
NEEPCO to replace the CTs with higher ratio depending on system requirement at
the earliest.
The committee had requested NERPC Secretariat to write to NEEPCO for
replacement of above CTs at the earliest. NERPC Secretariat, vide letter No.
NERPC/OP/OCC/2013/2877-78 dated 13-02-2013 had requested NEEPCO to
take up the matter.
NEEPCO informed the house that tenders are yet to be called for procurement ofCTs .
Fixing of Additional Jumpers:
Fixing of additional jumpers at Tension Locations of 132KV Dimapur-Imphal line
has been completed while that for 132KV Jiribam-Loktak_II line is planned for
execution in the month of January-13.
In addition to the above, additional jumpering is now planned to be taken up for
132KV Loktak-Imphal-II & Badarpur-Khliehriat lines in line with NERLDCs
observation.
The required Special Connectors/Clamps for the purpose are under procurement by
POWERGRID. A tentative schedule for execution of Additional Jumpering Works in
the subject lines is appended below:
Sl.No.
Name of Line No. of TensionLocations for
Additional Jumpering
Proposed schedule
1 132KV Loktak-Imphal- II
38 Loc. 10 th February13 to20 th Feb13
2 132KV Badarpur-Khliehriat
176 Loc. 25 th Feb13 to 10 th Mar13
POWERGRID shall accordingly propose for the required daytime shutdown of the
respective lines in the preceding OCC Meetings
Constituents agreed to support POWERGRID for carrying out the modification
required for the lines. The committee requested POWERGRID to plan for additional
jumpering.
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D el i b er a t i o n o f t h e Co m m i t t e e
POWERGRID intimated the status as below:
The fixing of additional jumpers in 132 KV Loktak Jiribam II line has been
completed on 01.03.2013. Also fixing of additional jumpers in 132 KV Badarpur
Khliehriat line & 132 KV Loktak Imphal II line the order for special connectors
has already been placed by them and the same is likely to be delivered at site by
20.03.2013. Accordingly, the work is planned to be started w.e.f. 25.03.2013 in
132 KV Badarpur Khliehriat line followed by 132 KV Loktak Imphal II line.
T h e Su b -c o m m i t t ee n o t e d a s a b o v e.
C.8 LGBR for 2013 -2014:
During the 82nd OCC meeting, the issue of LGBR for 2013 -14 for NE Region has
been discussed in detailed and all the constituents have been requested to submit
the data for preparation of LGBR at the earliest as per the proforma circulated.
The formats have also been made available in the website of NERPC
(www.nerpc.nic.in) which covers the outage planning for Generating units as well
as important transmission elements in state and central sector.
All utilities had agreed to submit the data by February, 2013.
D el i b er a t i o n o f t h e Co m m i t t e e
S.E (O), informed that till date no constituents have submitted the above data
except TSECL, NEEPCO & Me.ECL (however, Me.ECL has not furnished the
maintenance schedule of its generating stations & transmission lines).
Constituents are requested to submit the above data in the format furnished by
NERPC at the earliest.
T h e Su b -c o m m i t t ee n o t e d a s a b o v e.
C.9 Grid Security Expert System (GSES):
POWERGRID has planned an automated defense plan for all five regions named as
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Grid Security Expert System (GSES). The Region wise estimated cost based on the
feeders identified by POSOCO including IDC shall be as follows:
S.N Subject NR SR WR ER NER All India
1. Estimated DPRcost of GSES(in Rs. Crores)
82.59 42.13 124.85 55.42 49.47 354.46
2. Number ofFeeders 1064 763 1502 503 410 4242
3. Estimated DPRcost of OPGWbasedcommunication
system (in Rs.Crores)
141.61 368.37 174.24 83.18 80.42 847.82
4. Length ofOPGW 4967 14706 6111 2868 2688 31340
TotalEstimated cost(in Rs. Crores)
224.20 410.50 299.09 138.60 129.89 1202.30
The GSES was discussed in detail in last Special TCC held at Shillong on 9th
February, 2013. After detailed deliberation the following decisions of the TCC was
conveyed to CERC.
1. All constituents agreed in principle to the technical requirement of the GSES
scheme for NER grid.
2. The basic infrastructure at most of Sub-station like circuit breakers, protection
relays, etc. are not adequate for implementation of the scheme.
3. There are no full fledged SLDCs in Ar. Pradesh, Manipur, Mizoram andNagaland.
4. Funding is major concern as NER states are financially weak.
5. The quantum of UFR based load shedding needs to be relooked for NER States.
6. More deliberation on technical and commercial issues is required before
formulation/implementation of the scheme.
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All constituents had agreed in principle to the technical requirement of the GSES
scheme for NER grid, but more deliberation on technical and commercial
implication was required before formulation / implementation of the scheme.
I t w a s a g r ee d t h a t D PR p r e p a r ed b y POW E R GR I D f o r G SE S a n d o t h e r r el a t e d
d e t a i l s w i l l b e s en t t o co n st i t u e n t s t a t es f o r s cr u t i n y a n d t h e m a t t e r w i l l b e
d e l i b er a t e d f u r t h er i n O CC/ CC m eet i n g .
C.10 Assessment of Total Transfer Capability (TTC), Transmission ReliabilityMargin (TRM) and Availability Transfer Capability (ATC) by SLDC onrespective Inter-state transmission corridor:
As per Clause No. 4.1 of Detailed Procedure for Relieving Congestion in Real Time
Operation, SLDC shall assess TTC, TRM and ATC on its inter-state transmission
corridor considering a mesh intra-state corridor for import or export of power withthe Inter-state Transmission system (ISTS).
SLDCs of NER are requested to assess the above on monthly basis, 5 months in
advance (eg: TTC/TRM/ATC for the month of November to be calculated by 15th of
July), for further assessment of TTC, ATC and TRM of NER ER corridor by
NERLDC and for assessment of TTC / ATC for a group of control areas, individual
control areas with the region and state-control-area to state-control-area by
NERLDC, if required.
Power Utilities are requested to send the results of calculations along with
assumptions and *.sav (PSS/E saved case format) files to NERLDC by 15th of the
month.
During the 81st OCC meeting, the committee requested SLDCs to take initiatives
for assessment of TTC, TRM, ATC for their inter-state transmission system.
NERLDC gave a presentation on the congestion of ER-NER corridor.
During 82nd OCC meeting, Assam Representatives stated that the criteria and
methodology of calculation of TTC/ATC with typical example may be made
available to the constituents so that they will be aware of the TTC calculations and
they can calculate TTC/ATC for their own system / inter-regional/intra-regional
transmission line.
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NERLDC agreed to provide the details of criteria and methodology of calculations of
ATC/TTC.
D el i b er a t i o n o f t h e Co m m i t t e e
During the meeting, NERLDC had also made presentation on this issue to
highlight about the technical constraint. All the constituents requested NERLDC to
enhance the ATC/TTC so that acute shortage of power in the region can be relieved
during the lean hydro period, since generation from Pallatana GBPP is not
expected before May, 2013.
GM, NERLDC informed that due to limitation in 400 KV Farakka Malda D/C line
and (N-1) criteria, the import of power from ER is being restricted by NLDC.
S.E (O), NERPC suggested that matter should be discussed with ERPC and CEA
All the constituents agreed to the proposal.
T h e Co m m i t t e e n o t ed a s a b o ve .
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D. N E W I T E M S
D.1 Proforma for Operational Statistics
The operational Statistics as given below was not furnished in the meeting.
(i) Schedule Vs Actual Generation.
(ii) Peak Demand: Schedule Vs Actual.
(iii) Integrated Operation of the system.
(iv) Details of DC, schedules and injections from Central sector stations, drawalschedules and entitlements of constituents.
(v) Details of major reservoirs in NER.
T h e o p er a t i o n a l s t a t i c s w er e s h o w n i n t h e p r es en t a t i o n b y NE RL D C.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
D.2 State-wise anticipated peak demand/requirement, shortage for March- July,2013.
T h e su b -Co m m i t t ee r e vi e w ed & f i n a l i z ed t h e a n t i c i p a t ed p e a k
d e m a n d / en e r g y r e qu i r em en t / Av a i l a b i l i t y (w i t h o u t Pa l l a t a n a g e n er a t i o n ) f o r
t h e m o n t h s of M a r c h t o J u l y, 2 0 1 3 .
A. Peak Demand
S.No. State
Peak
Demand
(MW)
Mar 13
Peak
Demand
(MW)
Apr 13
Peak
Demand
(MW)
May 13
Peak
Demand
(MW)
Jun 13
Peak
Demand
(MW)
Jul 13
1 Ar. Pradesh 105 105 110 110 130
2 Assam 1210 1230 1250 1250 13003 Manipur 105 100 110 110 130
4 Meghalaya 280 280 290 280 280
5 Mizoram 75 70 75 70 90
6 Nagaland 115 110 120 110 120
7 Tripura 230 230 240 230 250
Region 2120 2125 2195 2160 2300
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B. Peak Availability
T h e Co m m i t t e e n o t ed a s a b o v e.
D.3 Ensuring FGMO/RGMO, AVR & PSS tuning for operation of units
In line with IEGC & other regulations the following aspects may be ensured while
operation of generating units:
i. Operation of generators under Free Governor Mode of Operation (FGMO) or
Restricted Governor Mode of Operation (RGMO).
ii. Operation of Generating Units within capability limits as per Capability Curves.
iii. Proper settings of Automatic Voltage Regulator (AVR) and
iv. Proper tuning of Power System Stabilizers.
The issue has gained significant importance in the aftermath of twin grid
disturbances on 30 th & 31 st July, 2012. All concerned are requested to please
attach maximum priority on this aspect and do the needful at the earliest. In thisregard directions of Honble CERC against Petition nos. 191/2011(Suo-motu) & 47-
52/MP/2012 may please be referred.
During the 81 st OCC meeting, the subcommittee had requested all generating
companies and constituent states of the region to furnish status of implementation
of RGMO.
S.No. State
Peak
Availability
(MW)
Mar 13
Peak
Availability
(MW)
Apr 13
Peak
Availability
(MW)
May 13
Peak
Availability
(MW)
Jun 13
Peak
Availability
(MW)
Jul 13
1 Ar. Pradesh 75 70 65 65 120
2 Assam 920 900 850 825 1000
3 Manipur 75 70 70 70 120
4 Meghalaya 180 175 170 165 250
5 Mizoram 55 50 45 45 75
6 Nagaland 75 75 75 65 90
7 Tripura 145 140 130 120 185
Region 1525 1480 1405 1355 1840
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The status of implementation of FGMO/RGMO & PSS is as given below:
Assam: Karbi Langpi HEP- The machines are very old (Manufactured in 1983) and
there is no provision of FGMO and it is not possible to implement RGMO.
Me.ECL: Umiam Stage-III- Extension has been requested from CERC for putting
FGMO.
NHPC: Loktak- Machines are operating with FGMO and sincere effort is being made
to implement RGMO by October, 2013.
NEEPCO informed that PSS tuning has not yet been done for Unit#-III of RHEP and
same is likely to be completed by 2014.
OTPC also informed that the Generating units are with PSS.
Meghalaya informed that for Umiam Stage III PSS has not been tested. The samewould be cheeked and intimated accordingly
T h e Co m m i t t e e n o t ed a s a b o v e.
D.4 Generation Planning (ongoing and planned outages)
The daily availability for hydro stations was reviewed in the meeting as per the
present water level of different reservoir which is as given below:
Khandong 0.1476 MU
Kopilli 0.6550 MU
Kopili- II- 0.3150 MU
Ranganadi - (subject to inflow)
Doyang 0.0540 MU
Loktak - 0.3150 MU
The shutdown proposal of NEEPCO/NHPC as approved by the committee is
enclosed at Annexure D.4 .
The acute shortage of power in the region, during this lean hydro period, is
compounded due to non-availability of generation from GBPP of OTPC. Expecting
the availability of generation from OTPC plant after May 2013 and taking into
consideration the acute shortage of power in the region during this lean hydro
period,
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Member Secretary I/C suggested to utilize the available water in the reservoir of
Kolipli HEP so as to provide some relief to constituent states during the peak hours.
All constituents supported the suggestion of Member Secretary I/C and NERLDC
was requested to take necessary action accordingly.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
D.5 Outage Planning Transmission elements
After detail discussion the sub-committee approved the shutdown proposal for
March/April, 2013 as given in Annexure D.5.
SE (O), NERPC requested all the constituents to submit the Shutdown proposals
by end of the preceding month so that it can be planned in better way for smooth
grid operation and last minute change in shutdowns programme can be avoided.
All the constituents agreed to intimate the list of shutdowns by the end of the
current month before the next OCC meeting.
T h e S u b -c o m m i t t ee n o t e d a s a b o ve.
D.6
Estimated Transmission Availability Certificate (TAC) for the month ofFebruary, 2013.
The Estimated Transmission/System Availability for the month of February, 2013
furnished by PGCIL is 99.9492% as per details at Annexure D.6 . NER
constituents were requested to give their comments and observations, if any, by
25th March, 2013 so that Final TAC for the month of February, 2013 can be
issued.
T h e su b -Co m m i t t ee n o t ed a s a b o ve.
D.7 Major grid disturbances in the previous month (February, 2013 )
As intimated by NERLDC, there was no major grid disturbance during the month
of February, 2013.
T h e su b -Co m m i t t ee n o t e d a s a b o v e.
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D.8 Mock Black start exercise of ISGS stations as well as state sector generatingstations of NER:
In line with the stipulations of IEGC clause 5.8(b) mock black start exercise of ISGS
stations are being carried out every year. The exercise for RHEP & DHEP will be
carried out in the last week of February, 2013. States, who are having owngeneration are also requested to carry out similar exercise.
During the 81 st OCC meeting, the subcommittee had requested all generating
companies (state & central sector) to provide details of the Mock Black start
exercise of generating station (if carried out so far).
NEEPCO agreed to carry out the exercise as decided by NERLDC.
OTPC informed that they dont have adequate capacity of DG set to Black Start
their machine.
D el i b er a t i o n o f t h e Co m m i t t e e
The issue was deliberated and GM (O&M) NHPC stated that Loktak black started
last year supplying power to Manipur for 24 hours. He further stated that in order
to carry out such mock black start, proper co-ordination is required from both
NERLDC and beneficiary states as such test is vital for security of the grid.
Sr. Manager, NEEPCO informed that mock black start was done for Doyang HEP
and the generating station was supplying power to Nagaland but hunting of
machine started while loading the machine. He requested NERLDC to check the
load increment so that proper loading of machine is achieved to prevent tripping.
T h e su b -Co m m i t t ee n o t e d a s a b o v e.
D.9 Empowering of SLDC:
It has been observed in many occasions that Shift-In-Charges available in control
rooms of some SLDCs are not able to take decision in respect of curtailment of
overdrawal, without the consent of superiors, despite of several requests from
NERLDC. This practice should be avoided by empowering the Shift-In-Charges to
take decisions on their own considering the grid condition.
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D.14 Power flow from 400/220KV Misa S/S:
Me.ECL informed that as per information available with their office the 400KV
Killing Silchar lines were energized on three occasions i.e., on the 25th February
(at 22:10Hrs), 26th February (at 21:11 Hrs) and 3rd March (at 21:26Hrs) 2013
respectively. During such occasions it is observed that there was flow of power from
the 400/220 kV MISA substation to the corresponding substation at Silchar via
Me.ECLs 220Kv MISA- Killing lines.
In view of the above, the matter on the Status of the 220 kV MISA- Killing lines with
regard to such Inter-State flow of power may please be discussed.
T h e i s su e w a s d e l i b er a t ed a n d m e m b er s a g r eed t h a t 2 2 0 k V MI S A - K i l l i n gL i n e m a y b e i n c l u d e d i n t h e l i s t o f d eem e d I S T S L i n e s i d en t i f i e d b y R PC.
H o w e ver , f o r r ec o ver y o f t a r i f f t h r o u g h Po C m e ch a n i s m , Yea r l y Tr a n s m i s s i o n
Ch a r g es f i x e d by c on c er n e d R eg u l a t o r y Co m m i s s i o n sh o u l d b e a va i l a b l e a n d
sy s t em st u d i e s n eed t o be c a r r i e d o u t t o p r o v e t h a t t h e l i n e ca r r i es m o r e t h a n
5 0 % of i n t er -s t a t e p o w e r. I t w a s a l s o n o t ed t h a t n o sy s t em s t u d i e s h a v e b ee n
d o n e f o r t h e d eem ed I S T S L i n e s i d e n t i f i e d b y R PC. T h e p r o p o sa l o f M e .E CL
w i l l b e p u t u p t o T C C/ R PC f o r a p p r o va l .
D.15 High tripping rate & Long Duration Outage of dedicated 11 KV Feeder forAuxiliary Power Supply to 132KV Badarpur Substation:
The 11 KV HT dedicated feeder emanating from Panchgram Lower Substation
(AEGCL) & connected to 132KV POWERGRID Badarpur Substation was constructed
by ASEB (as a deposit work) for catering to the Auxiliary power/station load
requirement of 132KV Badarpur Substation.
However, service of the said feeder has been found to be considerably unreliable.
On an average, the feeder has been found to trip 10-15 times a day with cumulative
outage hours up to 5 hrs per day. The matter has been taken up & repeatedly
pursued with ASEB (CAEDCL) on a number of occasions but there has been no
improvement in reliability of the feeder.
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The 132KV Badarpur Substation is a vital node for catering to the power
requirement of the 132KV pocket & is connected to major substations viz. 400KV
Silchar Substation & 132KV Panchgram Substation(AEGCL) in addition to 3 other
key substations. Further, the station is playing a significant role for evacuation of
power from Pallatana GBPP to the rest of the 132KV pocket. Hence uninterrupted
auxiliary power supply to the station is of utmost requirement for maintaining a
healthy Protection & Communication System at the station.
The issue has been discussed in 80th & 81st OCC meeting, whereby it was
informed by Assam that there are some temporary tappings from the existing 11KV
dedicated feeder connected to POWERGRID Badarpur S/s. Subsequently, it was
also learnt that the temporary tappings have been removed.
However, there has been no improvement in service of the dedicated feeder sincefrequent power interruption still continues to take place on account of load
shedding.
ASEB (CAEDCL) may kindly treat the above-said issue with priority & take
necessary action for ensuring uninterrupted power supply through the 11 KV
dedicated feeder connected to POWERGRID Badarpur Substation.
T h e m a t t er w a s r e f er r ed t o Pr o t e ct i o n Co -O r d i n a t i o n s u b -Co m m i t t e e M eet i n g(PCCM).
D.16 Continuous violation of ATC/TTC limits due to overdrawal by constituents urgent requirement of Pallatana generation :
NERLDC informed that ATC/TTC limits of ER-NER corridor is being violated
continuously due to sustained over drawal by constituents resulting in insecure
operation of integrated grid. Less availability of power within the region is the root
cause of this problem. All concerned are requested to co-operate for secure
operation of grid by maintaining drawal as per schedule. At the same time
Generation at Pallatana is urgently required at this juncture to save the situation.
T h e Su b Co m m i t t e e n o t e d a n d c o n s t i t u e n t s a r e r e qu e st e d t o co -o p er a t e w i t h
NE RL D C a n d f o l l o w t h e d r a w a l s ch e d u l es f o r s ec u r e op er a t i o n o f g r i d .
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(LA, CT, CVT/PT, Isolator, CB, Earth Switch, Wave Trap etc) as these are required
for study purpose.
I t w a s a g r e ed t h a t t h e d e t a i l d a t a c ol l ec t ed d u r i n g p r o t e ct i o n a u d i t m a y be
u t i l i z ed f o r r e f er en c e .
D.21 VSAT communication system for RC - SLDCs:
During the 76th OCC meeting, NERLDC informed that due to supply of sub-
specification item, the VSAT order will be cancelled & fresh tender will be initiated.
In the meantime POWERGRID is establishing a State-of-the-Art optical fiber based
communication facility for the entire country connecting all RLDCs, NLDC &
SLDCs. In view of this the process of retendering of VSAT communication system
for four RC-SLDCs is being dropped to avoid duplication.
T h e S u b -Co m m i t t e e n o t ed a s a b o ve .
D.22 Any Other Item:
D.23.1 Additional agenda items:
1. Open cycle generation of AGBPP:
The following set of meters is used for calculation of open cycle generation of
AGBPP.
KT-03 NP-5804-A 0150 2000.0000 KATHALGURI GT-1KT-04 NP-5805-A 0150 2000.0000 KATHALGURI GT-2KT-05 NP-5806-A 0150 2000.0000 KATHALGURI GT-3KT-06 NP-5807-A 0150 2000.0000 KATHALGURI GT-4KT-07 NP-5818-A 0150 2000.0000 KATHALGURI GT-5KT-08 NP-5819-A 0150 2000.0000 KATHALGURI GT-6KT-09 NP-5820-A 0150 2000.0000 KATHALGURI GT-7KT-10 NP-5822-A 0150 2000.0000 KATHALGURI GT-8KT-11 NP-5823-A 0150 2000.0000 KATHALGURI GT-9
There are 3 modules with set of 3 meters viz.
Module-1: NP-5820-A (Steam turbine 1); NP-5804-A (Gas turbine 1) and NP-5805-A
(Gas turbine 2)
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Module-2: NP-5822-A (Steam turbine 2); NP-5806-A (Gas turbine 3) and NP-5807-A
(Gas turbine 4)
Module-3: NP-5823-A (Steam turbine 3); NP-5818-A (Gas turbine 5) and NP-5819-A
(Gas turbine 6)
Open cycle generation is calculated by assuming that the plant is operating in open
cycle whenever reading of meters installed with the steam is zero and there is some
reading on either of the gas turbines for each module. However, sometimes reading
of the steam turbine is not available and in such case, it is assumed that the steam
turbine is under shut-down/ maintenance and the same are being treated as open
cycle mode unless it is reported that meter is faulty.
Considering the recent hearing at CERC, open cycle mode of operation may be
required to be discussed in OCC/CC meetings and RPC Secretariat may be required
to certify the open cycle generation for each month. The following points are
suggested for deliberation in respect of open cycle generation of AGBPP:
1) The monthly percentage figures indicated in the Regional Energy Account
are indicative of open cycle generation for that month and it has no
commercial implication until the same has been agreed in OCC / CC
meetings.
2) In case of emergency situation, NEEPCO may intimate NERLDC/ NERPC
the requirement to operate in open cycle mode.
3) The healthiness, correctness and present status of the set of meters used for
calculation of open cycle generation should be jointly verified by
NEEPCO/PGCIL and APDCL.
4) Whenever the reading of any of the above set of meters used for calculation
of open cycle generation is un-available due to any reason, the reason
should be sent to NERLDC/ NERPC immediately. If the reason of non-
availability is not sent to NERLDC/ NERPC, the same may be treated as
operation in combined cycle mode.
The issue was deliberated in 19th Commercial Co-ordination Committee Meeting
held at Guwahati and members agreed the following points.
1) NEEPCO should not claim commercial benefits arising out of certification
from RPC Secretariat unless the same is approved in OCC/CC forums.
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2) RPC Secretariat will not mention open cycle generation certification of
AGBPP in the monthly REAs henceforth; however, the same will be
depicted as open cycle generation of AGBPP for the month which can be
used for billing purpose only after approval in OCC/CC/PCC forum.
3) Before operating in open cycle mode, NEEPCO should inform NERLDC
about operation in open cycle mode. The reason/urgency and tentative
duration should be intimated.
4) NERLDC should intimate beneficiaries about open cycle operation of the
plant. Beneficiaries may not like to buy such power at a higher price.
Moreover, since scheduling of generation is done on station basis and not
unit basis, scheduling of generation is not feasible unless scheduling is
done on unit basis.
5) As RPC Secretariat is certifying open cycle generation of combined cycle
plants in other regions, the same will be required to be certified by NERPC
Secretariat. The issue is brought to the members for deliberations to find
out a suitable method of certifying open cycle generation for combined cycle
plants.
T h e S u b -Co m m i t t e e n o t e d a n d t h e m a t t e r w i l l b e d e l i b er a t ed i n O CC/ CC f o r u m
a f t er CE RCs h ea r i n g on A p r i l 9 , 2 0 1 3 .
2. Representation in OCC/CC meetings:
The issue was deliberated in 19th Commercial Committee Meeting and it was
suggested to include representation of commercial personnel in OCC forum and vice
versa for CC forum.
T h e Su b -Co m m i t t e e a g r ee d t o t h e s u g g es t i o n o f C C M ee t i n g .
D.23.2 Agenda By AEGCL:
1. In many occasions, it has been observed that scheduling of ISGS like
Ranganadi and Kopili were increased for very short time period. In general in
between 19:45 hrs to 20:00 hrs, the increased quantum is around 50 to 70 MW.
So, it is very difficult to manage the load for that said period as we can neither
utilize that power for such a brief period nor can we show under drawal at
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20:00 hrs as we always have to impose heavy load shedding. This will reflect the
erratic picture of our peak loading.
CGM (S L D C), A EG CL e x p l a i n e d t h e s i t u a t i o n c i t i n g t h a t s u d d e n i n c r e a s e o f
l o a d t o 5 0 t o 7 0 M W i n a t i m e -b l oc k a n d r e d u c i n g a g a i n i n t h e n e x t b l oc k i s
n o t f e a si b l e . B es i d e s, si n c e t h e s ch ed u l e i s a l r ea d y i n c r ea s ed b y c er t a i n
a m o u n t , t h e c or r esp on d i n g u n d er d r a w a l a t 2 0 : 0 0 h r s m a y b e i n t er p r e t ed a s
A ssa m h a v i n g s u r p l u s p ow er d u r i n g t h a t p er i o d , w h i c h i s n o t t h e r ea l
s i t u a t i o n a s l o a d s h e d d i n g i s i m p o s ed t o on t h e c o n s u m e r s . H e r eq u e st e d
N ER L D C t o l o o k i n t o t h e i s s u e a n d a v o i d s u c h f l u c t u a t i o n s i n t h e sc h e d u l e s o
t h a t p r o p er d r a w a l sc h ed u l e c a n b e i m p l e m en t ed b y S L D Cs .
T h e s u b -c o m m i t t e e n o t e d a n d r eq u e st e d N E RL D C t o l o o k i n t o t h e m a t t er f o r
r em e d i a l m ea s u r es . T h e s a m e w i l l b e r e v i ew e d i n n e x t O CC m e et i n g .
2. Due to low generation of hydro power station and further reduction of TTC/ATC
at the NER-ER corridor, the power scenario of NER is horrible nowadays. In this
connection, Member Secretary (I/C) of NERPC has been requested to discuss
the issue when all the beneficiaries of NER will take stable power from
Pallatana.
CG M , S L D C, A ss a m em p h a s i z ed t h e n e ed f o r e n h a n c em en t o f T T C / AT C i n E R - NE R c or r i d o r s o t h a t s h o r t t e r m p u r c h a s es ca n b e m a d e by A ssa m f r o m
o u t s i d e t h e r eg i o n a n d a c u t e sh o r t a g e o f p o w e r i n A s sa m c a n b e r el i ev ed t o
so m e ex t e n t a n d t h e m i ser y o f p er s on s w o r k i n g f o r d i s t r i b u t i o n s y st e m w i l l
b e r e d u c ed .
T h e m a t t er h a s a l r ea d y b ee n d i s c u s sed a t i t e m N o .D .4
T h e su b -c om m i t t e e a l so su g g est e d A s sa m t o h a v e a b i l a t er a l t i e u p w i t h
Tr i p u r a t o p u r c h a s e t h e S m a l l q u a n t u m o f p ow er , w h i c h i s bei n g s ol d b y
Tr i p u r a t o ou t si d e t h e r eg i o n t h r o u g h Po w er E x c h a n g e .
3. It is understood that 2 nos of 160 MVA 220/ 132 kV ATS have been installed at
Byrnihat (PG) sub-station to evacuate power through 132 kV network. In this
regard, Assam would like to know from Meghalaya whether any provision has
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been kept to tap the power either at Kahilipara or at Sarusajai through this 132
kV network.
S E (S L D C), Me. ECL i n f o r m ed t h a t t h er e i s n o ex i s t i n g a r r a n g em en t t o t a p
p o w e r a t t h e a b o v e s t a t i o n s . A E G C L w a s r e q u e s t e d t o c o n t a c t t h e
t r a n s m i s si o n w i n g o f Me. ECL f o r f u r t h er i n f or m a t i o n s/ d et a i l s.
D.23.3 Agenda By NHPC:
ED, NHPC informed that the low voltage (121kV to 123kV) at Loktak 132kV bus
is creating problem for auxiliary system and motors are likely to be damaged
due to low voltage.
GM, NERLDC informed that the voltage is well within the tolerable band of
CERC. The matter was discussed earlier in OCC meeting. The committee
requested NHPC to submit details regarding the low voltage problem to NERLDC
for further study and matter will be deliberated in next OCC.
D.23 Date & Venue of next OCC meeting
It is proposed to hold the 84th OCC meeting of NERPC on 9th April, 2013
(Tuesday). As per roaster, Mizoram will be the host for 84th OCC meeting. The exact
venue will be intimated in due course.
The meeting ended with thanks to the Chair.
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Annexure-I
List of Participants in the 83rd OCC meeting held on 11/03/2013
SN Name & Designation Organization Contact No.
1. Sh. Tarik Mize, EE(E), SLDC Ar. Pradesh 09436059758
2. Sh. N.C. Das, CGM, SLDC Assam
3. Sh. P.K. Sarma, GM (Com) Assam
4. Sh. B Bordoloi, DGM, SLDC Assam
5. Sh. A. K. Saikia, AGM Assam 09864116176
6. Sh. K. Goswami, AGM, APDCL Assam 09435041494
7. Sh. Shantikumar, EE (SCD-I) Manipur 09436022381
8. Sh. Th. Kamini M Singh, EE (TCD-I) Manipur
9. Sh. B.C. Sharma, EE (SCD-II) Manipur 09436020911
10. Sh. A. Kharpan, SE (SLDC) Meghalaya 09436117802
11. Sh. D.J. Lyngdoh, AEE, SLDC Meghalaya 09863063375
12. No Representative Mizoram
13. No Representative Nagaland 09436002696
14. Sh. B. Debbarma, DGM (SO) Tripura 09436450501
15. Sh. Debabrata Pal, Sr. Mgr. Tripura 09436500244
16. Sh. T. S. Singh, GM NERLDC 09436302717
17. Sh. B. Medhi, Dy. Mgr. NERLDC 09436335376
18. Sh. P. Kanungo, DGM NERTS 0943630282319. Sh. S.I. Singh, DGM PGCIL, Imphal 09436035172
20. Sh. B. Goswami, Sr. Mgr. (E) NEEPCO 09436163983
21. Sh. D. Chattopadhyay, GM (O&M) NHPC
22. Sh. B.S. Karn, CE (Loktak) NHPC
23. Sh. R. C. Singh, Mgr.(E) NHPC 09436894889
24. Sh. H. Deshmukh, Engr (E) NHPC 09402880217
25. Sh. Pranay Kumar, Engr. (E) NHPC
26. Sh. R.K. Tanzing, Engr. (E) NHPC 0940288021727. Sh. A. Mukherjee, JE NHPC 09436894887
28. Sh. Mukul Banerjee, GM (Plant) OTPC 09899354722
29. Sh. S.K. Ray Mohapatra, MS I/C NERPC 09818527857
30 Sh.B. Lyngkhoi, SE (O) NERPC 09436163419