72nd OCC Minutes

8/13/2019 72nd OCC Minutes

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No. NERPC/AS/OCC/2012/ 2877-2909 Date: 18thApril, 2012

To,

1. Managing Director, AEGCL, Bijuli Bhawan, Guwahati 781 0012. Director (Distribution), Me. ECL, Lumjingshai, Short Round Road,Shillong 793 0013. CGM, (LDC), SLDC Complex, AEGCL, Kahelipara, Guwahati-781 0194. Chief Engineer (WE Zone),Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 1115. Chief Engineer (EE Zone),Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 1116. Engineer-in-Chief (P&E), Department of Power, Govt. of Mizoram, Aizawl 796 0017. Chief Engineer (P), Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 0018. Chief Engineer (P), Department of Power, Govt. of Nagaland, Kohima 797 001 9. General Manager, TSECL, Agartala 799 00110.ED (O&M), NERTS, PGCIL, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 00611.ED (O&M), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-79300312.ED (Commercial), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-79300313.ED (O&M), NHPC, NHPC Office Complex, Sector-33, Faridabad,Haryana-12100314.ED (Commercial), NHPC, NHPC Office Complex, Sector-33, Faridabad,Haryana-12100315.AGM, NERLDC, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 00616.Member Secretary, ERPC, 14 Golf Club Road, Tollygunge, Kolkata-70003317.Chief Engineer, GM Division, Central Electricity Authority, New Delhi 110066

Sub: Minutes of the 72ndOCC Meeting held on 10thApril, 2012 at Guwahati.

The Minutes of the 72ndOCC Meeting of NERPC held on 10.04.2012at Hotel GrandStarline Hall, Christian Basti, Guwahati is enclosed for favour of kind information andnecessary action please.

The minutes is also available on the website of NERPC www.nerpc.nic.in

Encl: As above

/Yours faithfully,

. /B. Lyngkhoi)/ Assistant Secretary

Copy to:

1.Chief Engineer, AEGCL, Bijuli Bhavan, Guwahati - 7810012.Chief Engineer, APGCL, Bijuli Bhavan, Guwahati - 7810013.MD, CA DISCOM, Bijuli Bhavan, Guwahati - 7810014.MD, UA DISCOM, Bijuli Bhavan, Guwahati - 7810015.MD, LA DISCOM, Bijuli Bhavan, Guwahati - 7810016.S.E. (Trans. & Dist), MeSEB Lumjingshai, Short Round Road,Shillong 793 0017.Head of SLDC, MeSEB, Lumjingshai, Short Round Road,Shillong 793 0018.Head of SLDC, Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 1119.A.C.E. (Gen & Trans), Department of Power, Govt. of Nagaland, Kohima 797 001

10.Head of SLDC, Department of Power, Dimapur, Nagaland11.A.C.E. (Power-I), Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 00112.Head of SLDC, Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 00113.S.E. (Trans & Dist), Department of Power, Govt. of Mizoram, Aizawl 796 00114.Head of SLDC, Department of Power, Govt. of Mizoram, Aizawl 796 00115.Head of SLDC, TSECL, Agartala 799 00116.Chief Engineer(Elect), Loktak HEP,Vidyut Vihar, Kom Keirap, Manipur- 795124

Government of IndiaMinistry of Power

North Eastern Regional Power Committee

- . Meghalaya State Housing Finance Co-Operative Society Ltd.

Building

, 793003Nongrim Hills, Shillong 793003.

Ph. No 0364 -2520050

Fax No : 0364 2520030

ISO 9001:2008


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North Eastern Regional Power Committee

MINUTES OF THE 72nd

OPERATION COORDINATION SUB-COMMITTEE MEETING

OF NERPC

Date : 10/04/2012 (Tuesday)

Time :10:30 hrs

Venue :Hotel Grand Starline, Guwahati.

The List of Participants in the 72ndOCC Meeting is attached at Annexure I

Shri A.K. Mishra, Member Secretary I/C, NERPC welcomed all the participants to

the 72nd OCC. He briefed about the power scenario during the month of March,

2012 and stated that all the grid parameters were within the IEGC band. Further,

he mentioned that there was no major grid disturbance during the month of March,

2012 and he also mentioned about the latest IEGC/CERC Regulations viz.

preparation of LGBR, Islanding Scheme in NER, etc. He requested all the

constituents to keep themselves updated with these new regulations for the benefit

of their organizations.

Thereafter, Member Secretary I/C requested Shri B. Lyngkhoi, Assistant Secretary,NERPC to take up the agenda items for discussion.

CONFIRMATION OF MINUTES OF 71st MEETING OF OPERATION SUB-COMMITTEE OF NERPC.

AS, NERPC mentioned that the minutes of the 71st OCC meeting held on 12th

March, 2012 at Guwahati were circulated vide letter No.NERPC/AS/OCC/2012/5268- 5300 dated 19thMarch, 2012.

DGM, NERLDC stated that they have one observation on Items No. D. 2 to be

modified as below:

Item No: D.2 - Minutes recorded: The NERLDC agreed for putting these

information in their website.

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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Minutes of 72ndOCC meeting held on 10thApril, 2012 at Guwahati

2

Minutes to be recorded: DGM, NERLDC informed that all the information

regarding SEMs and their CT/PT ratio etc are already available in their website

under the link Market Operation SEMs in NER

CM, NERTS, POWERGRID stated that they have some observation on Items given

below to be modified:

Item No: B.1 - Minutes recorded:The OCC Sub-committee requested NERLDC

and POWERGRID to find out the cause of overvoltage at above substations and

requested for carrying out system studies to evaluate the requirement of additional

reactors.

Minutes to be recorded: The OCC Sub-Committee requested POWERGRID to

expedite the commissioning of 80 MVAR, 400 KV Bus Reactor at Balipara againstKameng HEP scheme to mitigate the issue of over voltage in the grid at the earliest.

POWERGRID agreed to look into the matter.

Item No: C.3 - Minutes recorded:The issue regarding Non-utilization of transfer

facility at Khandong HEP has been discussed in detail and the Sub-committee has

advised both POWERGRID and NEEPCO to resolve the matter bilaterally as agreed

by them in the last NERPC meeting. Both POWERGRID & NEEPCO agreed to

discuss and sort out the matter.

Minutes to be recorded: The issue regarding Non-utilization of transfer facility at

Khandong HEP has been discussed in detail during various OCC meeting after 12th

NERPC meeting, but till date the matter remained unresolved. The Sub-committee

has decided to take up the issue again in 13thNERPC meeting.

Item No: C.5 - Minutes recorded:POWERGRID disagreed with the statement and

requested Dept. of Power, Govt. of Arunachal Pradesh to furnish the certificate

received from Statutory Officials so that further action would be taken up by

POWERGRID.

Minutes to be recorded: POWERGRID disagreed with the statement and

requested Dept. of Power, Govt. of Arunachal Pradesh to furnish the certificate

received from Statutory Officials. Arunachal Pradesh agreed to furnish the same

shortly.


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x) Over Voltages at 400 kV substations were observed at Bongaigaon, Misa andBalipara, where maximum voltage observed were 422 kV, 434 kV and 434 kV

respectively. Over voltage at 220 KV S/S was observed at Misa was 282 KV.

xi) No over Voltages were observed at 132 kV S/S.xii)No Under Voltages were observed at 400 kV S/S, 220 kV S/S. Under voltages

observed at 132 kV S/S at Aizawl was 120 kV each.

xiii)Regional Generation & Inter-regional Exchangesduring the month of March,2012 compared to February, 2012 are given below:

SN Parameter March, 2012 February, 2012

REGIONAL GENERATION & INTER REGIONAL EXCHANGES (in MU)

1 Total Generation in NER (Gross) 512.993 502.953

2Total Central Sector Generation

in NER (Gross)277.010 270.280

3

Inter-Regional Energy Exchanges

(a) NER - ER 2.59 2.16(b) ER - NER 315.62 274.21

(c) Net Import 313.03 272.05

Th e Sub -comm i t t ee no t ed a s above.

FOLLOW UP ACTION

C. 1 Installation of new Under Frequency Relays (UFRs) in NER systems andconstituent-wise quantum of load relief as recommended by the sub-committee:

The latest status of installation of UFRs in Manipur could not be updated as no

representative was present from Dept. of Power, Manipur.

NERPC informed that only Tripura has certified that UFR installed are working

satisfactorily.

NERLDC requested NERPC to compile the list of UFR installed in NER, their

locations and quantum of load relief etc. and the same should be made available in

the website of NERPC. NERPC agreed that once the UFR installation is completed

in all the NER States the same would be done accordingly.

Th e sub -Comm i t t ee no t ed a s above.


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C. 2 Feasibility Report for 132 KV Ranganadi Nirjuli Line:

POWERGRID informed that their SEF and Engineering Department have examined

the proposal and suggested to construct new circuit as reconductoring of existing

circuit or coverting existing single circuit line to double circuit is not feasible.

Further, POWERGRID informed that they have already carried out the walkover

survey and report is submitted for internal approval. The status would be

intimated in the next OCC/NERPC meetings for getting the concurrence.

Th e Sub -comm i t t ee no t ed as a bove.

C. 3 Non-utilization of transfer facility at Khandong HEP:

CM, POWERGRID informed that as stated earlier in the amendment, the issue may

be referred to next NERPC meetings.


C. 4 Implementation of Single-Phase Auto-Reclosure (SPAR) scheme forTransmission Lines:

The OCC Sub-committee reviewed the issue pertaining to SPAR and the status as

indicated during the 72ndOCC meeting are given below:

SN Name of the Line OwnershipStatus as given on 72nnd OCC

meeting.

1 220kV Kopili - Misa # I & II KHEP, NEEPCO May, 2012

2 220kV Salakati BTPS - I & II BTPS, AEGCL May, 2012

3 220kV Balipara Samaguri Samaguri, AEGCL One year

4 132kV Khandong Haflong KHEP, NEEPCO Order for CBs have been placedand the work is likely to becompleted by June, 20125 132kV Khandong Kopili KHEP, NEEPCO

6 132kV Loktak - Jiribam # II Loktak, NHPC Completed

7 132kV Ranganadi- Ziro RHEP, NEEPCO *

*During the 69th OCC meeting, NEEPCO expressed their unwillingness to replace

the CBs at their ends as these CBs are less than 10 (ten) years old. It was

suggested that if Ar. Pradesh is interested to buy these CBs from NEEPCO and use

at their sub-stations, then the same may be communicated to NEEPCO for further

necessary action. NERPC also stated that once the SPAR is implemented then the

problem of frequent tripping in Ar. Pradesh line would be minimized. NERPC had


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requested Ar. Pradesh to look into the matter and communicate their decision at

the earliest.

*SE, Dept. of Power, Govt. of Ar. Pradesh stated that since this is a matter of policy

decision it would not be possible for him to decide in the meeting. He requested

NERPC Secretariat to write to Dept. of Power, Govt. of Ar. Pradesh so that the

matter could be resolved.

Accordingly, NERPC, vide their letter dated 30.01.2012, had written to the

Secretary (Power), Govt. of Arunachal Pradesh to look into the matter at the

earliest and intimate NERPC Secretariat about their action plan on this matter. No

communication has been received so far from Govt. of Arunachal Pradesh.

EE, SLDC, Dept. of Power, Arunachal Pradesh informed that they would not

procure the above CBs from NEEPCO. However, the issue will be discussed again

in the next OCC . Since no representative from Ar. Pradesh was present, the status

could not be updated. To a query whether NEEPCO will implement the SPAR

scheme at 132 KV Ranganadi Ziro line as Ar. Pradesh was not interested to buy

the old CBs, NEEPCO informed that under such circumstances they will not

implement the scheme on this line.

Member Secretary (I/C) stated that since the matter was recommended by the RPC

the same should be put up in the next RPC meeting for consideration/approval.

Th e Sub -c omm i t t ee dec i d ed t o r e f er t h e ma t t e r o f S l . No . 7 above t o t h e ne x t

NERPC m eet i n gs .

C. 5 Installation of Harmonic filters:

During the 69th OCC meeting SE, Ar. Pradesh informed that Satyam Plant has

already installed the harmonic filters at their plant. Further, he informed that

Statutory Officials have certified stating that the work has been completed.

POWERGRID disagreed with the statement and requested Dept. of Power, Govt. of

Arunachal Pradesh to furnish the certificate recived from Statutory Officials so that

further action would be taken up by POWERGRID.

Meanwhile POWERGRID vide their letter No. NESH/OS/F-502/817 dated

20.03.2012 has intimated that join inspection with Dept. of Power, Govt. of Ar.

Pradesh has been carried out at Satyam Steel Plant in Banderdewa and it was


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found that no harmonic filters were installed at the site as stated by Dept. of Power

earlier.

CM, POWERGRID informed that installation of 11thHarmonic Filter is required to

be expedited by Arunachal to avoid stresses on euipments.

Th e Comm i t t e e de c i d ed t o r ef er t h e ma t t e r t o t h e nex t NERPC m eet i n g .

C. 6 Status of 132 KV Kopili Khandong 2ndCkt:

NERPC stated that during the 12th TCC/NERPC Meetings, POWERGRID had

informed that the Final Forest Clearance has been received and POWERGRID has

started mobilizing the team to carry out the construction of 4 (four) remaining

towers of above line and the work would be completed by January, 2012.

Accordingly, the job was taken up by POWERGRID during the approved shut down

period from13.01.2012 to 23.01.2012. But, on 23.01,2012 a fatal accident had

occurred during the stringing of conductor on for which one tension tower before

dead end tower got totally damaged. Subsequently POWERGRID restored the Line

# 2 on 23.01.2012 and Line # 1 on 23.01.2012 temporarily on old tower as per the

existing arrangement.

Meanwhile, POWERGRID has already arranged the tower from MeECL and applied

shut down during the period from 23.04.2012 to 04.05.2012 for Line # 1 and from

06.05.2012 to 14.05.2012 for Line # 2 to carry out restoration on permanent basis.

The proposed shut down has already been approved in 72ndOCC and thus, the job

is expected to be completed by 15thMay 2012.

Th e Comm i t t ee no t ed a s above .

C. 7 Restoration of LILO of 132 KV Dimapur (Nagaland) Kohima (Nagaland) lineat 220/132 KV Dimapur (PG) S/S.

EE, Dept. of Power, Nagaland informed that request for shutdown on 28.03.2012

has been received from POWERGRID to carry out LILO work at Dimapur

substation, but since no approval from competent authority was obtained, the

convenient date shall be intimated to POWERGRID again.

Th e Comm i t t ee r eques t ed POWERGRID t o pu r sue t h e m a t t er w i t h Dep t . o f

Powe r , Gov t . o f Naga l a nd .


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C. 8 VSAT Communication:

AGM, NERLDC informed that VSAT commissioning has not been accepted by them

since the parameters are not as specified by them. Further, he informed that they

have asked them to carry out the work as per specification or else the contract

would be terminated and they would seek another vendors to carry out the same

work. The matter would be intimated in the next OCC meeting.


C. 9 Demand for Assam & Arunachal Pradesh:

NERLDC informed that demand of state for Assam & Arunachal Pradesh (area

wise demand & for others total demand), Generation Pattern of States,

Generation Pattern of ISGS, Outage Planning of transmission elements, outage

planning of generation elements for fifth month i.e. June, 12 is necessary. These

information are required for calculation of TTC/ATC to facilitate STOA.NERLDC

also informed that in line with the decision of 71stOCC meeting they have sent

reminders to all the constituents.

Assam informed that they have already taken the initiative to furnish the data at

the earliest, but since the data are to be provided by Generating Division; they

requested NERLDC to write directly to their generating utilities for early

compliance.

The Comm i t t e e r e que s t e d a l l t h e con s t i t u e n t s t o f u r n i s h t h e above

i n f o r ma t i o n a t t h e ea r l i est .

C. 10 Machine Data for Dynamic Simulation for NER Power System :

NERLDC informed that during the 69th OCC meeting, they have intimated that

they would undertake dynamic study of NER system is required for ensuring

security and stability of the grid. For this purpose, technical data of all generating

units are urgently required (especially Assam, Meghalaya & Tripura & ISGS).Accordingly, NERLDC had circulated the proforma during the meeting and

requested all the constituents to submit the relevant information by January,

2012, but none of the constituents have submitted the information, except

Tripura.

In the meeting NERLDC stated that they have sent reminders to all concerned for

furnishing the same.


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Th e Comm i t t e e r eq u es t ed c o n c er n ed u t i l i t i e s t o f u r n i s h t h e d a t a a t t h e

ea r l i e s t .

C. 11 Looping arrangement of 132 KV Balipara Ranganadi - Nirjuli Gohpur -Balipara.

NERLDC informed that most of the time 132kV Balipara Gohpur line remains

open and under lean hydro condition the power to Gohpur is fed through 132 kV

Balipara Ranganadi - Nirjuli Gohpur route. In case of exigency, for closing of

132kV Balipara Gohpur line, without disconnecting any sections of 132 kV

Balipara Ranganadi - Nirjuli Gohpur line, the phase sequence at Gohpur needs

to be checked. For the benefit of the grid, Balipara looping arrangement should be

tested at a suitable time in consultation with NERLDC. AEGCL was requested to

check the phase sequence of Balipara Gohpur line at Gohpur.

Assam informed that the date for test synchronization (phase sequence) of the

above line has been fixed for 28.03.2012 in consultation with NERLDC. Assam vide

letter dated 28.03.2012 informed that phase mis-match between Samaguri and

Nirjuli-Balipara has been rectified and is ready for looping of the above line. Assam

informed that test synchronization of above line can be carried out in consultation

with NERPC, NERLDC/POWERGRID, NEEPCO and AEGCL. Assam requested

NERLDC to inform the suitable date. NERLDC agreed.


C. 12 Transformer Tap Optimization required to operate the system withinpermissible voltage limit

NERLDC informed that transformer data are required to carry out system study for

operating the system within permissible voltage limit. Further, the format for

furnishing relevant transformer data was distributed by NERLDC long back and it

was requested to furnish the relevant data by February, 2012.

No constituent had furnished the relevant information so far except Tripura,

POWERGRID & NHPC.

Member Secretary (I/C) requested all the constituents to furnish the required

information at the earliest. Consttuents agreed.


C. 13 Double pole center break type isolator at R.C. Nagar I & II.

Tripura informed that 6 (six) Nos. Double pole center break type line isolators &


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auxiliary bus isolators connected at R.C. Nagar Line I & II bays at 79 Tilla Grid

S/S belong to POWERGRID. Out of these, 3 (three) Nos. are fully out of order & 3

(three) others are not functioning properly, even Earth Switches were also non-

functioning. The issue has already been taken up with POWERGRID and the same

has been inspected by them. Tripura requested POWERGRID to look into the

matter at the earliest.

POWERGRID informed that they have inspected the site and the matter has

already taken up with M/S BIMCO, the original manufacturer of the isolator for

replacement of MOM Box which will take some time for procurement and

execution.

Further, CM, POWERGRID informed that the said 132 KV bays (two nos.) of

POWERGRID at 79 Tilla Grid S/S was constructed by TSECL as deposit work and

since inception (a) the earth switches were not functioning and (b) no gravel

spreading was done. Also, till date, TSECL has not handed over the bays to

POWERGRID.

A f t e r de t a i l ed d i s cuss i on t he Sub - comm i t t ee r eques t ed POWERGRID and

TSECL t o r es ol v e t h e m a t t e r b i l a t e r a l l y .

C. 14 Start up Power for Pallatana GBPP.

During the 71st OCC meeting, Tripura stated that during lean season, NERLDC has

not allowed Tripura to draw more than 35 MW due to constraints in 132 KV pocket,

whereas the demand has gone up day by day and now it is touching 220 MW

regularly. Hence arrangement of extra power to Pallatana for startup power is very

difficult.

The Sub-committee enquired if start up power can be extended to Pallatana during

the off-peak period. DGM, Tripura stated that the matter has to be discussed with

competent authority of TSECL.

Th e Sub -c omm i t t ee ha s dec i d ed t o d r op t h i s agend a .

D. N E W I T E M S

D. 1 Indian Electricity Grid Code (IEGC).

Member Secretary (I/C) NERPC informed that Amemndments have been issued by


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CERC in respect of IEGC Regulations, he requested all the constituents to update

themselves by reading regularly all these Amendments from CERC website for the

benefit of their organizations.


D. 2 Committee of Load Generation Balanced Report (LGBR).

Member Secretary (I/C), informed that as per Sub-Regulation (c) of the Regulation

5.7.4 of Principal Regulation(IEGC) (c) RPC Secretariat shall compile LGBR for peak

as well as off peak scenario and also prepare annual outage plan in the respective

region. RPC Secretariat shall then come out with the draft LGBR and draft outage

plan for the next financial year by 30th November of each year for the regional grid

taking into account the utilization of available resources in an optimal manner and

to maintain security standards. This will be done after carrying out necessary system

studies and, if necessary, the outage plan shall be rescheduled and LGBR shall be

modified, accordingly. Adequate balance between generation and load requirement

shall be ensured while finalising outage plan. The draft LGBR and draft outage plan

shall be uploaded by the RPCs on their websites.

During the meeting, it was informed that IEGC (First Amendment Regulation) 2012

& UI Charges & related matters (second Amemndment Regulations), 2012 have been

stayed by Honble Chennai High Court. However, it was decided by the sub-

committee to constitute a committee in the next OCC meeting for preparation of

LGBR for the next financial year i..e. 2013 -14.


D. 3 Empowerment of system operators in SLDC/Sub-station/Power plants.

NERLDC informed that they have observed that on many occasions the shift-in-

charges in SLDC/Sub-station/Power Plant control rooms hesitate to take decisions

without consulting their higher authorities. This causes problem in real time

operation of the grid especially during emergency situations. Hence, empowerment

of shift-in-charges is very essential to maintain secured grid operation.

Member Secretary (I/C) also requested all the constituents to abide by the

instruction of NERLDC for security of the grid. However, regarding empowerment

he requested NERLDC to write to their management or the matter can be referred

to the next NERPC meeting.

Th e Sub -comm i t t ee no t ed as a bove.


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D. 4 Quarterly report on DG set operation.

NERLDC informed that they have requested NHPC (Loktak) and NEEPCO for

regular & timely submission of the weekly test run report of DG set earmarked for

Black start of the plant. Though NERLDC have received only one letter from NHPC

but no communication was received from NEEPCO. Further, DGM, NERLDC

informed that as per IEGC the reports on the above are to be furnished on

quarterly basis to NERLDC

Sr. Manager, NEEPCO informed that they will take up the matter and assured that

quarterly report on DG set operation would be furnished to NERLDC.

Since no representative was present from NHPC, the Sub-committee requested

NERLDC to take up the matter with NHPC.


D. 5 Frequent revision of OCC approved shutdown schedule of grid elements.

NERLDC informed that as decided in the 71st OCC meeting shutdown of

Transmission lines or Generating stations should be adhered to approved

shutdown schedule in the OCC meeting for grid security as well as market

operation optimization.

Member Secretary (I/C) also shared the same opinion with NERLDC and further

stated that it has been observed that just few days after the OCC meeting, some

constituents have requeseted to either grant the new shutdown or deviation from

the approved shutdown. Also at times, Annual Plan shutdown proposal are

requested after the OCC meeting. This is not a healthy practice. He requested all

the constituents to put their shutdown proposal in the meeting for approval of the

sub-committee. Also, no deviation of shutdown would be considered henceforth,

unless in case of emergency.

AGM, NERLDC informed that in case of any deviation proper planning of ATC/TTC

could not be optimally ascertained and may lead to commercial loss to the

constituents.

Constituents enquired if their state lines shutdown have to be approved by the

OCC. AGM, NERLDC informed that list of important grid elements are already

identified at NERPC forum. Any shutdown/opening of those listed lines has to be

approved by the OCC Sub-committee.



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D. 6 Indiscriminate & sustained overdrawal by constituents resulting in Inter-Regional ATC violation.

NERLDC informed that it has been observed in the recent times that constituents

are overdrawing from the grid despite of repeated requests/messages from

NERLDC. This results in violation of Inter-regional ATC and also jeopardizing

system security. NERLDC requested constituents to adhere to real time advices of

NERLDC for secured system operation

Member Secretary (I/C) NERPC requested once again to all the constituents states

of NER to follow the real time instruction by NERLDC for grid security. Also, he

informed that CERC is monitoring very closely to the constituents who constantly

overdraw through respective RLDC and if constituents continue to persist their

overdrawl, they may have to pay the penalty as fixed by CERC.


D. 7 State-wise anticipated peak demand/requirement, shortage for April, May,June, July & August, 2012.

Th e s u b-Comm i t t ee r evi ew e d & f i n a l i z ed t h e a n t i c i p a t e d p ea k

d emand / en e r g y r eq u i r emen t / Ava i l a b i l i t y f o r t h e mon t h s o f A p r i l , Ma y , J u n e,

J u l y & A u gu s t , 2 0 1 2 .

A. Peak Demand

S.No. State

Peak

Demand

(MW)

Apr 12

Peak

Demand

(MW)

May 12

Peak

Demand

(MW)

Jun 12

Peak

Demand

(MW)

Jul 12

Peak

Demand

(MW)

Aug 12

1 Ar. Pradesh 110 105 110 110 110

2 Assam 1000 1020 1000 1050 1100

3 Manipur 110 110 100 100 110

4 Meghalaya 255 265 260 260 270

5 Mizoram 75 75 70 70 70

6 Nagaland 105 110 105 105 105

7 Tripura 210 200 210 195 225

Region 1838 1835 1835 1890 1990


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B. Peak Availability


D. 8 Shutdown of Baramura Gas Turbine, TSECL.

The Sub-committee discussed and approved the shutdown proposal of TSECL for

21 MW Gas Turbine U #V of Baramura GTP from 16.04.2012 (00:00 hrs) to

19.04.2012 (17:00 hrs) for CI & BI.


D. 9 Generation Planning (ongoing and planned outages)

The daily availability for hydro stations as given in the meeting is given below.

Khandong 0.132 MU

Kopilli 0.490 MU

Ranganadi - (subject to inflow)

Doyang 0.099 MU

Loktak - 0.315 MU

The Sub-committee discussed & approved the shutdown proposal of NHPC for

Loktak U #3 w.e.f. 11.04.2012 to 05.05.2012.


D. 10 Outage Planning Transmission elements

The Sub-committee discussed the shutdown proposal of POWERGRID & Assam

with various constituents and approved the programme of transmission line

outages for April/May, 2012 with certain modifications as desired by constituents.

S.No. State

Peak

Availability

(MW)

Apr 12

Peak

Availability

(MW)

May 12

Peak

Availability

(MW)

Jun 12

Peak

Availability

(MW)

Jul 12

Peak

Availability

(MW)

Aug 12

1 Ar. Pradesh 80 75 70 65 110

2 Assam 875 850 800 800 1050

3 Manipur 80 75 70 70 100

4 Meghalaya 200 200 190 185 200

5 Mizoram 50 45 45 40 70

6 Nagaland 85 80 75 70 100

7 Tripura 140 135 130 120 170

Region 1510 1460 1380 1350 1800


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15

The same is enclosed at Annexure D.10. Restricted drawal pattern during the

shutdown of 220/132 KV ICT at Kopili on 04.05.2012 is also attached at

Annexure D.10 (i). All the constituents are requested to follow the drawan

pattern as decided.


D. 11 Estimated Transmission Availability Certificate (TAC) for the month ofJanuary, 2012.

The Final TAC for the month of February, 2012 has not been issued by NERPC as

the data are yet to be received from POWERGRID.

The Estimated Transmission/System Availability for the month of March, 2012

furnished by PGCIL is 99.9678 % as per details at Annexure D. 11. NER

constituents were requested to give their comments and observations, if any, by

27thApril, 2012 so that Final TAC for the month of March, 2012 can be issued.

Th e sub -Comm i t t ee no t ed as a bove.

D. 12 Major grid disturbances in the previous month (March, 2012 )

There was no major grid disturbance during the month of March, 2012

Th e sub -Comm i t t ee no t ed as a bove.

D. 13 Additional items

i). Data required for determination of TTC/ATC for fifth month:

a) Area wise Peak and Off-peak demand of Assam

- Dhaligaon area, Depota area, Gohpur area, Upper Assam area, South Assamarea and Rest of Assam

b) Area wise Peak and Off-peak demand of Arunachal Pradesh- Ziro area, Itanagar area, Khupi area

c) Peak and Off-Peak demand of other states- Manipur, Meghalaya, Mizoram, Nagaland, Tripura

d) Peak and off-peak Generation of States

e) Peak and off-peak Generation of ISGSf)Outage Planning of Transmission elements & Generation elements

As per Item No C.9 of Minutes of 71st OCC Meeting, Reminder vide Ref

NERLDC/SOII/9869-85 dtd 21.03.12 was sent to all power utilities of NER for

furnishing above data.

Data required for determination of TTC/ATC not yet received from any utilities.

Meghalaya had furnished past four months Data.


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16

ii). Machine data for Dynamic Simulation for NER Power System:

As per Item No C.10 of Minutes of 71st OCC Meeting, reminder vide Ref

NERLDC/SOII/9950-68 dtd 26.03.12 sent along with Format. Steady State data &

few dynamic data of machine received from AGTPP ( Data for exciter and governor

snot yet received) and only steady state data from TSECL received (Data for

Dynamic Simulation not yet received).

iii). Tap optimization is required to operate system voltage within permissible

limit:

Data from Arunachal Pradesh, Assam, Manipur, Nagaland not yet received.

Tap setting data for all GTs (Generator Transformers) are also required.

iv). Furnishing of element-wise relay setting details:

These data are required for limit checking of elements while conducting offline

load-flow study in NER grid.

Letter vide Ref NERLDC/SOII/5610-24 dtd 15.12.11 was sent to all power utilities

of NER for furnishing of element-wise relay setting details.

Relay Setting Data not yet received from any power utilities of NER.

v). Submission of data for required development of Power Atlas of NER & States

of NER:

Letter vide Ref NERLDC/SOII/9767-81 dtd 19.03.12 was sent to all power utilities

of NER for development of Power Atlas of NER & states of NER.

Assam has furnished Essential Load, Max, Min & Avg Demand of Load Centre,

Hydro & Thermal Power Station Data. Latest Power Map, Sub-Station and

Transmission Line data not yet received.

Arunachal Pradesh has not furnished data as per our requirement.

vi). Shutdown of 400 KV Bongaigoan Binaguri II w.e.f. (07:00 hrs to 17:00 hrs)

of 12.04.2012 to 18.04.2012 (daytime) by POWERGRID:

TTC/ATC to be revised due to this shut down.


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17

vii). Furnishing of Monthly Generation (in MU) data for monthly Power Supply

Position (PSP) and Unit Generation (UG) report:

These reports are to be sent to CERC and RPC by 1st of every month for the

previous month. It is being seen that some constituents are delaying data

submission resulting in undue delays in report preparation.

Constituents are requested to send the data by 1300Hrs of 1st of every month for

the previous month.

Th e sub -Comm i t t ee r equ es t ed NERLDC t o t a k e up w i t h r espect i v e cons t i t u en t s

o f NER t o col l e ct a l l t h e r e l evan t da t a . NERLDC ageed .

D. 14 Date & Venue of next OCC meeting

It is proposed to hold the 73rdOCC meeting of NERPC on 9thMay, 2012 (Tuesday).

As per roster NHPC would be the host for 73rdOCC meeting.

NHPC informed that the venue would be intimated soon to NERPC Secretariat.

The meeting ended with thanks to the Chair.

*******


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18

Annexure-I

List of Participants in the 72ndOCC meeting held on 10/04/2012

SN Name & Designation Organization Contact No.

1. No Representative Ar. Pradesh

2. Sh. N.C. Das, CGM, SLDC Assam 09435559447

3. Sh. K.K. Das, DGM, LD&C Assam 09435182116

4. Sh. B.C. Bordoloi, DGM, MRT Assam 09435045625

5. Sh. A.K. Saikia AGM, LD&C Assam 09864116176

6. Sh. A. Kharpan, SE, SLDC Meghalaya 09436117802

7. Sh. F. Kharshiing, EE, SLDC Meghalaya 09863066960

8. Sh. D.J. Lyngdoh, AEE, SLDC Meghalaya 09863063375

9. Sh. L. Nongkhlaw, AEE, PLCC Meghalaya

10. No Representative Mizoram

11. No Representative Manipur

12. Sh. Bendang Longkumer, EE, SLDC Nagaland 09436004642

13. Sh. B. Debbarma, DGM (SO) Tripura 09436450501

14. Sh. T.S. Singh, AGM NERLDC 09436302717

15. Sh. N.R. Paul, DGM NERLDC 09436302723

16. Sh Anupam, Engineer. NERLDC 0943633537917. Sh. P. Kanungo, CM. (SO) NERTS 09436302823

18. Sh. B. Goswami, Sr. Mgr. (O&M) NEEPCO 09436163983

19. Sh. Aroop Sharma, Sr. Mgr. (Coml) NEEPCO 09436304964

20. No Representative NHPC 09436894889

21. Sh. A.K. Mishra, SE (O) NERPC 09402134275

22. Sh.B. Lyngkhoi, AS NERPC 09436163419

23. Sh. D.K. Bauri, EE NERPC 09863317236

.ooOoo.


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Annexure-I

Shutdown Programme for the month of April, 2012

as approved in the72nd OCCM held on 10.04.2012 at Guwahati.

S/D PROGRAM FOR POWERGRID TRANSMISSION LINES & ITS ASSOCIATED BAYS:

S/N Name of Tr. Lines Date Time PurposeAreas / Feeders

Affected

1

132kV Aizawl

Kumarghat

17.04.12 to

19.04.12

08:00 to 16:00 Hrs To facilite stringing of

400kV D/C Pallatana-Silchar line, underconstruction

132kV Aizawl-

Kumarghat

2

132kV Gohpur-

Itanagar(Subject to consent

of Ar. Pradesh)

23.04.12 to

30.04.12

08:00 to 16:00 Hrs Diversion of loc.05 to 08,

on account of widening of

gauge by Railways.

132kV Gohpur-

Itanagar

3

132kVKhandong-Kopili-I

23.04.12 to04.05.12

Continuous S/D from8:00Hrs(23.04.12) to16:00Hrs(04.05.12)

Dismantling of existingsingle circuit tower,erection of new 220kV

D/C tower & shifting of

conductor to new tower.

132kV Khandong-Kopili-I

4

132kVKhandong

-Kopili-II

06.05.12 to

14.05.12

Continuous S/D from

8:00Hrs(06.05.12) to16:00Hrs(14.05.12)

Shifting of conductors

from ERS & existingtowers to newly

constructed towers underMissing Link Project.

132kV Khandong-

Kopili-II

5

220kV Misa-

Kopili-I

05.05.12 to

14.05.12

08:00 to 16:00 Hrs Shutdown required for

replacement of defectiveinsulator strings.

220kV Misa-

Kopili-I

6 400kV Balipara-

Bongaigaon-I &

II

Deferred to

next OCC

To facilitate shifting of

208-loc.211 of the line

necessitated as a result ofRailway Tract Gauge

Conversion being carriedout by Indian Railways.

400kV Balipara-

Bongaigaon-II

7132kVPanchgram -

Dhullavcherra

20.04.12 to24.04.12

Continuous S/D To facilitate stringingactivity of Silchar-

Hilakandi line

132kV Panchgram- Dhullavcherra

8132kV Badarpur-

Kolasib

26.04.12 to

27.04.12

08:00 to 16:00 Hrs 132kV Badarpur-

Kolasib

9132 kVBadarpur

-Jiribam

29.04.12 to

30.04.12

08:00 to 16:00 Hrs 132 kV Badarpur-

Jiribam

10132 kV Badarpur-Khliehriat

12.04.12 08:00 to 16:00 Hrs 132 kV Badarpur -Khliehriat

S/D PROGRAM FOR NEEPCO TRANSMISSION LINES & ITS ASSOCIATED BAYS:

11

400 kV

Ranganadi-Balipara-I & II

In co-ordination with NERLDC For installation of 2n

numerical relay

400 kV Ranganadi-

Balipara-I & II

S/D PROGRAM FOR TSECL TRANSMISSION LINES & ITS ASSOCIATED BAYS:

12132 kV P K Bari- Dharamanagar

16.04.12 &28.04.12

08:00 to 16:00 Hrs 132 kV P K Bari -Dharamanagar

S/D PROGRAM FOR ASEB TRANSMISSION LINES & ITS ASSOCIATED BAYS:

13220 kV Mariani Samaguri-II

11.04.12 09:00 to 13:00 Hrs Modification of CTconnection

220 kV Mariani Samaguri-II


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Restricted Drawal Pattern during shutdown of 220/132kV Kopili ICT during OFFPEAK hours

MW MW

Manipur 60 AGTPP 78

Meghalaya (drawal from KHT[PG]) NIL Tripura 95Mizoram 47 Khandong 21

Tripura 107 Loktak 30

South Assam 52

132kV Dimapur-Imphal S/C flow = 45 MW

MW MW

Manipur 52 AGTPP 78

Meghalaya (drawal from KHT[PG]) 20 Tripura 95

Mizoram 47 Khandong 21

Tripura 104 Loktak 30

South Assam 47

132kV Dimapur-Imphal S/C flow = 45 MW

Case- I ( Meghalaya drawal from KHT(PG) to be NIL)

Case- II ( Meghalaya drawal from KHT(PG) restricted to 20MW)

Restricted Drawal Generation

Restricted Drawal Generation

72nd OCC Minutes

Documents

Transcript of 72nd OCC Minutes