भ रत सरक र Government of India व द य त म त र लय Ministry of Power उत तर क ष त र य व द य त सवमवत Northern Regional Power Committee

Transcription

1 भ रत सरक र Government of India व द य त म त र लय Ministry of Power उत तर क ष त र य व द य त सवमवत Northern Regional Power Committee स. - उक ष व स/प रच लन/106/01/2017/ द न क: व षय: उत तर क ष त र य व द य त सवमवत क प रच लन समन य उपसवमवत क 141 ब ठक क क यय त I Subject: Minutes of 141 st OCC meeting of NRPC. उत तर क ष त र य व द य त सवमवत क प रच लन समन य उप-सवमवत क 141 ब ठक क आय व त क गय थ उक त ब ठक क क य त त उत तर क ष त र य व द य त सवमवत क बस इट पर उपलब ध ह यद क य त पर क ई टटप पण ह त क य त र करन क एक सप त ह क अन र सकत ह I 141 st meeting of the Operation Co-ordination Sub-Committee of NRPC was held on & The Minutes of this meeting have been up-loaded on the NRPC web-site Any comments on the minutes may kindly be submitted within a week of issue of the minutes. -sd- (उप न र क म र) अध क षण अवभय त ( प रच लन) स म : प रच लन समन य उपसवमवत क स स य To : As per list 18-ए, शह त ससह म गय, कट टरय सर य, नई द ल ल फ न: फ क स: ई-म ल: seo-nrpc@nic.in बस ईट: 18-A, Shaheed Jeet Singh Marg, Katwaria Sarai, New Delhi Phone: Fax: e- mail: seo-nrpc@nic.in Website: 1

2 Minutes of 141 st Meeting of Operation Coordination Sub-Committee (OCC) of NRPC held on & at NRPC New Delhi. The list of participants is at Annexure-A MS NRPC welcomed the participants in the meeting and stated the following in his opening remarks: 1. NRPC express its grief on the tragedy that took place in NTPC plant at Unchahar. He requested everyone to observe two- minute silence & light candles in the memory of the people who lost their lives in the tragic incident. He stated that such incidents are a lesson for the future and efforts need to be made to be more cautious and improvements in the system safety need to be made so that recurrence of such incidents are avoided. 2. He stated that the protection system should not be vulnerable and no one should be able to hack our system. He mentioned that a fault in the Panki substation led to tripping of the Unchahar units. He requested the UPPTCL to investigate the same. 3. He further brought into notice the concern expressed by GM NRLDC regarding the tripping occurring frequently in the system on account of Fog. The frequent tripping in Punjab which led to the tripping of generating units was a matter of concern. 4. The frequency in the last few days he highlighted remained less than 50 Hz for more than 40-50% of the time. This he expressed is a major concern in the present scenario and measures need to be taken to avoid the dip in frequency and also the tripping of lines with Generator needs to be avoided. 5. He informed into light that the issue of winter preparedness was discussed and deliberated in the last TCC /NRPC meeting. He also stated that the progress of replacement of polymers and cleaning of insulators in view of the onset of winter season was reviewed on He requested all the utilities to carry out cleaning and replacement work expeditiously before the onset of dense Fog. 6. The issue of coal shortage was highlighted by him though he informed that the situation had improved lately but still the shortage persists. He further stated that in coming winter the generation from solar and wind would be less and the demand would be peaking up shortly in some states during December/January. Therefore, all thermal generators are requested to build up coal stock. 7. He also highlighted the issue of FGD installation which was discussed in the last TCC/NRPC meeting. He highlighted that Environmental ministry is very much concerned about complying with the new environmental norms for thermal stations. He informed that in the special TCC meeting the program for FGD installation has been prepared and was forwarded by CEA to the ministry for consideration. He further stated that units will be able to run only if the FGD got installed and they are 2

3 able to meet the new environmental norms. He advised all concerned to take up the issue with their management and initiate the process of installation of FGD as per the time frame decided. He proposed to all that suggestions on this issue be given so that the same can be shared with the concerned department of CEA. He further added that with installation of FGD no doubt the variable cost will increase there by changing the Merit Order RATING OF THE STATION. He proposed that some schemes could be introduced for the thermal units installing FGD timely, hence enabling them to be not effected in the Merit order. He further proposed that views about absorbing of the additional cost of FGD and the auxiliary consumption in the same may be shared. He added that from the next OCC meeting the progress of the action being taken for FGD installation would be monitored regularly. 8. MS NRPC stated that in the last TCC/NRPC meeting the issue of Cyber security was also discussed at length as it is a need of the hour. He informed the house that CE/IT in CEA will be conducting a workshop regarding Cyber security the details of which will be intimated shortly. 9. He informed that the issue of Telemetry was also highlighted in the NRPC/TCC meeting. He intimated that at present the percentage of Digital telemetry is only about 60%. He informed that as per information from NRLDC some stations have a single channel only and it becomes very difficult to manage the grid, if telemetry goes out. The issue of integration of RES telemetry was also highlighted for which he stated that the office is already taking up the issue with all utilities. He stated that in a certain utilities for 800MW renewable generation no telemetry is there. He added that the SLDC/RLDC will be able to manage the system better if the RES telemetry is available. He informed that it has been decided in the NRPC that no new element will be added in the system if the requisite telemetry is not there. Also, if the existing generators have no telemetry, they should provide the telemetry within a month. 10. MS NRPC stated that we all have to gear up for 5 minute scheduling. As the time period will now become very short and we will have to become prepared to schedule and forecast our generation and load in such a manner in which we can run our system smoothly.he stated that we need to know our load and generation patterns (especially renewable and hydro )properly. Also he stated that the forecasting program should be very good. 11. He added in that the communication system needs to be full healthy. NPC Division of CEA is preparing guide lines on availability of communication system. Any comments on this issue may be given to NRPC. 1. Confirmation of Minutes: The minutes of the 140 th OCC meeting held on & at NRPC, New Delhi were issued vide letter of even number dated The sub-committee confirmed the Minutes. 3

4 2. Review of Grid operations of last month (October 2017): 2.1 Anticipated vis-à-vis Actual Power Supply Position (Provisional) for October, Sub Committee was informed that there was vide variations (i.e. > 5.0%) in the Anticipated vis-à-vis Actual Power Supply Position (Provisional) for the month of October, It was observed that in the terms of Energy requirement variation was for Rajasthan, HP, UP & Uttarakhand and in the terms of Peak demand for Delhi, Haryana, Punjab, and Rajasthan & UP. SE (Operation) highlighted that the variations of 4-5 states is continuing every month though the LGBR figures for the next month are also shared as agenda item in every OCC. He added the reasons being given for the variation are also not specific.he proposed to all that they should give the Anticipated figures after taking all factors in consideration. HP representative intimated that there is some misconception in the figures. The Requirement of Energy appears to be lesser than anticipated. The decline is on account of the shutdown of the cement plant. The availability on higher side includes power of Hp government which is being disposed of on day to day basis. MS NRPC states that the anticipated availability should differentiate the amount that is to be exported. Rajasthan representative intimated that the growth has been 11% and load could not be managed. He stated that domestic & agricultural load has also come up. UP representative intimated that the variation is on account of temperature conditions and the coal shortage. Uttrakhand representative intimated that the anticipated figures given by them were on the higher side and load shedding / cuts were there on account of which variations are there. MS NRPC requested all utilities to fine tune their anticipated data being projected. The Sub-Committee was informed that the provisional Power Supply Position for the month of October, 2017 were available on CEA website. All SLDCs were requested to furnish the provisional and final power supply position in prescribed formats by 2 nd and 15 th day of every month, respectively regularly in compliance to the provision 5.3 of IEGC 2.2 Power Supply Position for NCR: The Sub-Committee was informed that the NCR Planning Board (NCRPB) is closely monitoring the power supply position of National Capital Region. Monthly power supply position for NCR till the month of October, 2017 is placed on NRPC website. 4

5 SE (O) brought forth the issue of relevance of this data. It was intimated by NRLDC representative that this data was required by the NCR Planning Board. MS NRPC decided that the feedback would be taken up with them on the issue. 2.3 Frequency Profile: Frequency remained within the IEGC band for77.39% of the time during October, 2017and is better as compared to 74.65% last year during same month. Utilities were requested to take necessary action to further improve the frequency regime viz. by staggering of load at hourly boundaries, primary response from the generators etc. The maximum and minimum frequency attained was 50.20Hz and Hz. However, frequency remained below the band limit of 49.9Hz for 44.51% of time & 45.63% on 6th & 7th Nov respectively and average frequency remained below 50.0Hz for most days Frequency profile details are enclosed at Annexure 2A. The issue of maintaining frequency of the grid was highlighted. The issue of lower Hydrogeneration and coal shortage in some plants was also highlighted. There was a lot of over drawl by WR/ER. 2.4 Voltage Profile: The voltage profile at the important 400 kv & 765 kv sub stations in the NR region was discussed and all utilities were advised to ensure minimal voltage deviation. 2.5 Long outage of the Grid Elements and Generating Units: The updated position, of the long outages of the grid elements and generators as updated is enclosed at Annexure 2B. All utilities concerned were requested to expedite the restoration of the same at the earliest. 2.6 Representative of NRLDC made a presentation on grid operation during October, 2017 and highlighted the following:- Peak demand met and minimum demand met for the region during September, 2017 was MW and MW respectively. Average consumption of the Region for October, 2017 increased by 6.34% (59MU per day) of corresponding month in previous year. Average Thermal generation in October 2017 increased by 11% (61 MU/Day) of corresponding month in previous year. Further comparisons regarding the Thermal Generation were also highlighted as detailed in Annexure 2C. Average Hydro generation in October, 2017 decreased by 4MU/day of corresponding month in previous year. Average nuclear generation in October, 2017 increased by 16 MU/day of corresponding month in previous year. Average renewable generation in October, 2017 decreased by 3.5 MU/day of corresponding month in previous year. Net Average Inter-Regional import decreased by 11 MU/day during October, 2017 as compared to corresponding month in previous year. 5

6 Net Average Import from WR decreased by18 MU/Day during October, 2017 as compared to corresponding month in previous year. Net Average Import from ER decreased by approx. 2 MU/day during October 2017 as compared to corresponding month in previous year. Net Average Import from NER (Agra-BNC) was 9.47 MU/day more during October, In the month of October, Ckt Kms 400 kv lines & 6 CKT KMS 220KV lines were added in the Northern Grid. Also, it was highlighted that 3075MVA ICT/GTs were charged in the month of 10/2017. Total outages during October 2017 were 610 including Planned S/downs (311) and Forced S/downs (Trippings-177+Emergency S/Ds-122). OCC advised all members to minimize the emergency shutdowns. It was observed that the major tripping and emergency shut downs were of Power Grid & UPPTCL.It was specifically advised to them to look into the reasons of the large number of tripping and take measures to rectify the same. Also the issue of Emergency Shutdown was highlighted, as the genuine needs to be looked into. Total outages of generating Units due to less demand/less gas availability were 1080 MW as on (SS 1080 MW). Total outages of generating Units due to coal shortage were 660 MW as on (SS 660 MW). The difference between data, received from SCADA and SEM in terms of % age was shown as- Punjab (.72), Rajasthan (1.55), Delhi (0.49), Uttarakhand (.83), UP (.32), Haryana (.38), J&K (1.42), HP (2.81) & UT Chandigarh (8.12). Representative of HP told the reason of variation nonavailability of Baspa telemetry. Tripping of single element multiple times was also discussed. Representative of NRPC/ NRLDC asked the utilities to take necessary action to avoid multiple times tripping of single element. 400kV Mathura-Muradnagar(New)-1 tripped 12 times in the month of October-2017, reason of tripping is less clearance phase to ground and jumper issue at multiple location as informed by representative of UP. Representative of UP told that shut of above line would be taken for month in the month of January-18 for rectification work and line is expected to be in Feb

7 The details of the Renewable energy generated in NR is as under: Maximum deviation was observed in Haryana, Rajasthan, HP followed by UP during October, Utilities were requested to maintain their drawls as per schedule. Schedule vs Actual load pattern of UP, Haryana& Rajasthan was shown for the day of , & (ANNEXURE 2 D). These utilities were overdrawing in the range of ( MW) at low frequency. These constituents along with all other constituents were requested to manage their load/schedule accordingly to avoid such high OD at low frequency. The issues in management of ramping of power during the peak hour were also explained through the plots and all entities were requested to give more attention towards ramp management as well. Utilities were requested to maintain their drawls as per schedule. It was mentioned that sustained overdraw on daily basis indicate some shortcoming in the planning for meeting the load. Consumption of UP and J&K was and 14.78% higher, while consumption of HP, Uttarakhand and Chandigarh was 8.37, 3.20 and 3.46 lesser during October 2017 as compared to October Total availability during October, 2017 had increased by MU/day as compared to corresponding month in previous year. 7

8 - -I -II - -III - I - II EXT III -II - - -I -I RLNG) RLNG) RLNG) L) L) The transmission losses was also discussed in the month of October 2017 V/s October The change in variable cost of generation was also highlighted Total Energy approved in STOA decreased as compared to last year October {October-2017 (1180 MU) and October-2016 (333 MU)}. 8

9 ... (STOA) vs (DA) (Contingency) (FCFS) (DA) (AD) (Contingency) (FCFS) (AD) l l The region wise details are brought out regarding the above in Annexure 2E. NRLDC representative told that 315 MVA ICT-2 was taken on load without permission of NRLDC.NRLDC representative requested all the utilities in this OCC as well some last OCC meetings not to integrate any new element into the grid without prior permission of NRLDC. 3 Maintenance Programme for Generating Units & Transmission Elements: 3.1. Maintenance Programme for Generating Units. The maintenance programme for Generating Units for the month of December, 2017 was discussed on The approved/deferred outages of generating units as per deliberations in OCCM issued vide letter of even number dated and the corrigendum dated Outage Programme for Transmission Elements. The Outage programme of transmission elements for the month of December 2017 was discussed on The approved/deferred outages of transmission assets as per deliberations in OCCM issued vide letter of even number dated and the corrigendum dated Planning of Grid operation 4.1 Anticipated Power Supply Position in Northern Region during December, 2017: Anticipated Power Supply Position in Northern Region during December, 2017 was discussed and the SLDCs were requested to update the estimated PSP & submit measures proposed to be taken to bridge the gap in availability as well as dispose of the surplus s, if any. While reviewing the Power Supply position the utilities were requested to update the figures if requires so that fine tuning of anticipated PSDP in NR during December, 2017 could be done. The amended figures are updated in Annexure 4. 9

10 PTCUL changed the figures seeing their load demand. DTL was requested to give the reasons for changing the figures. UP representative intimated the shortage, if any, will be met through power purchase. 5 Monitoring of schemes funded from PSDF(Agenda by NPC) The status of the schemes for which grant has been sanctioned from PSDF in Northern Region was reviewed. Details of schemes is enclosed in the ANNEXURE-5. All utilities were requested to submit information of physical as well as financial progress in the prescribed format by first week of every month on regular basis to Member Convener, PSDF Project Monitoring Group (AGM, NLDC and POSOCO) with a copy to NPC Division and NRPC. 6 Information about variable charges of all the generating units in the Region. The variable charges for different generating units are available on the Merit Order Portal namely, MS, NRPC requested all utilities to upload the data on the Merit Order Portal regularly, as the same is being monitored by the Ministry of Power. 7 Sub-stations likely to be commissioned in next 6 months. The details of the substations of Power Grid and their required downstream network as updated in the last TCC & NRPC meeting is enclosed at Annexure-7 of the Agenda of the 141 st OCC Meeting. The updated status is enclosed at ANNEXURE-7. However al the concerned states were requested to submit the details of the downstream network associated with these POWERGRID substations along WITH THE ACTION PLAN OF THEIR PROPOSED/APPROVED NETWORKS. 8. Cleaning and Replacement of porcelain insulators: All utilities were requested to submit the detailed status of progress made and the action planned for replacement/cleaning of porcelain insulators before the onset of winter, in the review meeting held on The Minutes of the Meeting were issued vide this office letter of even number dated All utilities are requested to submit the data in the formats enclosed in the minutes issued. 9 Recommendation of Enquiry Committee for grid disturbances on 30 th July, 2012 & 31 st July, 2012: Discussions on implementation of recommendations pertaining to operational aspects made by the Enquiry Committee for grid disturbances on 30 th July, 2012 & 31 st July, 2012 are as under: 9.1 Healthiness of defense mechanism: Self- certification A. i) In the 27 th meeting of NRPC held on 30 th November, 2012 it was decided that all STUs would ensure settings of UFR and df/dt relays and load relief as per target. 10

11 ii) iii) iv) Report of Mock exercise for healthiness of UFRs carried out by utilities themselves on quarterly basis is to be submitted to NRPC Secretariat and NRLDC. All utilities have been advised to certify specifically, in the report that All the UFRs are checked and found functional. Any discrepancy should be detailed upon and the time line for rectification of the same should also be intimated. In the 31 st meeting of NRPC held on it was decided that the quarterly test report of UFR and df/dt would be uploaded on the website of respective SLDC. In the 136 th OCC meeting all utilities were informed that UFRs testing by the NRPC secretariat is in progress and were requested to update any change in the name of officers assigned for UFR testing. v) The report of the UFR testing for quarter ending June 2017 has been received from all utilities by the 139 th OCC meeting. DTL& PSTCL, BBMB, HPSEB, HVPNL, UPPTCL & RVPNL have submitted the UFR testing report for the quarter ending September 2017and have been found to be in order. PTCUL was requested to submit the information. All utilities were requested to submit the information of the quarter ending December 2017 latest by B. BBMB had informed that replacement of static relays by numerical relays at 7 substations (5 stations in Haryana at Panipat, Dhulkot, Kurukshetra, Jagadhari & Hissar) by HVPNL was pending. 134 th OCC meeting: HVPNL representative had intimated that the LOA for procurement of 22 UFR relays has been placed. 136 th OCC meeting: HVPNL representative informed that relays will be replaced by th OCC meeting: HVPNL representative informed that the relays will be replaced by th OCC meeting: HVPNL representative intimated that relays stands received in the store and the concerned officers have been directed to change the relays in the BBMB substations. 139 th OCC meeting: HVPNL representative intimated that the work is in progress. 140 th & 141 st OCC meeting: HVPNL representative assured that the relays already stands handed over to BBMB and the work is targeted to be completed by C. On scrutiny of the UFR reports of PTCUL, it was noted that the static type UFRs were still installed on Transformers/feeders emanating from 132KV Majra and Jwalapur Substations and 220KV Ramnagar, Roorkee and Rishikesh Substations. 140 th & 141 st OCC meeting: PTCUL representative intimated that the order for numeric relays procurement has been placed and he assured that efforts are being made to get the relays replaced by

12 D. As the testing of UFR Relays has started by the NRPC Sectariat all utilities are requested to ensure that the testing kits are operational and the relays are in working condition at all their substations. The SLDC concerned will be intimated regarding the testing programme and they are requested to ensure that the concerned protection teams reach the substation with all the necessary arrangements. All utilities took note. 9.2 Strengthening of Intra-State transmission system Recommendation of the Enquiry Committee: Intra-State transmission system needs to be planned and strengthened in a better way to avoid problems of frequent congestion. In the NRPC meeting held on 30 th November, 2012, it was decided that SLDCs should give half yearly feedback to STU regarding bottlenecks, constraints and overloading in the State transmission network for proper transmission planning. Accordingly all SLDCs were requested to submit advice regarding constraints, to their STUs, regularly at half yearly intervals i.e. on 1 st January and 1 st July of every year. 136 th OCC meeting: All the SLDCs were advised to submit the next half yearly feedback ending June th OCC meeting: DTL, HVPNL in the meeting were requested to update the status specifically regarding the action taken/action plan of the STU on the feedback given by the SLDCs for the period ending December DTL & HVPNL updated THE information in the 138 th OCC meeting. All the SLDCs were again advised to submit the next half yearly feedback ending June 2017 in detail, in line with the feedback given by NRLDC in the various OCC Meetings, to their STUs with a copy to the NRPC Secretariat. Information from PSTCL stands received. 138 th OCC meeting: RRVPNL, DTL& HVPNL submitted the data in the meeting. PTCUL, UPPTCL, HP were requested to update the information. 139 th OCC meeting: In the meeting UPPTCL representative assured that the information would be send positively after the meeting. RVPNL has submitted the details of the action taken/action plan of the STU on the feedback given by the SLDCs for the period ending June 2017.All other utilities i.e. DTL, PSTCL & HVPNL who had submitted the information were also requested to submit the details of the action plan / action taken by their respective STUs. PTCUL & HP representative assured that the information will be updated at the earliest.ms NRPC proposed that a proactive role should be taken in this regard by all SLDCs 140 th OCC meeting: PSTCL & HVPNL representative intimated that they are pursuing the matter with their STUs regarding the details of the action plan / action taken by them regarding the recommendations given. PTCUL & HP updated the information ending June DTL representative intimated that the action plan of their STU already stands already proposed in the 138 th OCC meeting. 141 st OCC meeting: PTCUL & HP submitted the details of the action plan, taken by the STUs on the recommendations of the SLDCs. 12

13 PSTCL representative had intimated that the feedback received from their STU stands received and will be forwarded after scrutiny at their end. The information stands received. HVPNL representative intimated that the feedback from STU is yet to be received and the same is being pursued with them. 9.3 Installation of adequate static and dynamic reactive power compensators Based on the studies carried out by POWERGRID for identifying compensation required in intra-state network at 220 kv level, discussions held in the 29 th Meeting of NRPC and subsequent discussions, reactors were to be installed at 9 locations, out of which 6 have been installed. The updated status of remaining 3 reactors is as under: S. No. 1 SUBSTATION MVAR Implementation by HINDAUN 125 RVPNL Updated Status in 141 st OCC Expected by MERTA 125 RVPNL Expected by Study by POWERGRID for reactive compensation at 220 kv level: POWERGRID, in September, 2016 had submitted its report on Reactive compensation in Northern Region. Based on the reservations of Delhi and Rajasthan to the recommendations made by POWERGRID in the report, NRPC in its 39 th meeting had advised for referring the report by POWERGRID and study by Rajasthan to standing committee on Power System Planning of NR. In the 39 th Meeting of SCPSPNR held on 29 th &30 th May 2017 following was agreed: a) TCR of capacity 500 MVAr at Kurukshetra 400 kv bus. b) Bus Reactors at 30 no. 220 kv sub-stations and 18 no 400 kv level substations subject to the availability of space. It was also agreed that these reactors shall be provided by the owner of the substations. Reactors approved in the 39 th Standing Committee held on 29 th & 30 th May 2017 Sl.No. Bus Name State Reactors Proposed(MVAr) 220Kv 1 Jind(PG) Haryana 25 2 Fatehabad(PG) Haryana 25 3 Kishenpur(PG) J&K 25 4 Jalandhar(PG) Punjab 2X25 5 Nakodar Punjab 25 6 Amritsar(PG) Punjab 25 7 Dhuri Punjab 25 8 Akal Rajasthan 25 9 Suratgarh Rajasthan 2X25 10 Bikaner Rajasthan 2X25 11 Barmer Rajasthan Narela Delhi 25 13

14 13 R.K.Puram-I Delhi Patparganj 2 Delhi 2X25 15 Maharanibagh(PG) Delhi 2X25 16 Bamnoli Delhi SabjiMandi Delhi 2X25 18 Gopalpur Delhi 2X25 19 Indraprastha Delhi 2X25 20 Geeta Colony Delhi 2X25 21 Harsh Vihar Delhi 2X25 22 Wazirabad Delhi 2X25 23 Electric Lane Delhi 2X25 24 Mandola Delhi AIIMS Delhi 2X25 26 SaritaVihar Delhi Bawana Delhi PreetVihar Delhi Mundka Delhi Masjid Moth Delhi kV 1 Maharanibagh(PG) Delhi Mundka Delhi Mandola(PG) Delhi Hissar(PG) Haryana Kala Amb(TBCB) Himanchal Chamera Pooling Stn.(PG) Himanchal Kishenpur(PG) J&K Nakodar Punjab Jullandhar(PG) Punjab Moga(PG) Punjab Dhuri Punjab Patiala(PG) Punjab Jodhpur Rajasthan Sikar(PG) Rajasthan Allahabad(PG) U.P Meerut(PG) U.P Kashipur Uttarakhand Srinagar Uttarakhand th OCC meeting: The representative of RVPNL informed that the reactors as proposed by POWERGRID in their study and the proposal of RVPNL to install 13 nos. 220kV and 1 no. 400KV Bus Reactors at various GSS have been agreed in the 39 th Standing Committee Meeting held on th May It was further informed that the fund from PSDF would be utilized for the scheme. MS, NRPC requested Rajasthan to expedite the submission of the proposal for PSDF funding.representative of DTL informed that the scheme is under preparation and is planned to be implemented within 09 months. In the 1 st phase 30% of proposed reactor is planned i.e. at Bamnauli and Mahranibagh S/S. DTL was also requested to expedite the process. 139 th OCC meeting: The representative of RVPNL intimated in the meeting that the approval of PSDF funding of above said 14 reactors is awaited. He informed that PSDF 14

15 approval committee had certain reservations about the inclusion of Static and dynamic reactors in the same scheme, therefore, the scheme was being split into two separate schemes of static and dynamic reactors and was to be resubmitted. DTL representative informed that in the 1 st phase, 30% of proposed reactor is planned i.e. at Bamnauli and Mundka S/S rather than Mahranibagh S/S as informed in the 138 th OCC meeting. 140 th OCC meeting: The representative of RVPNL informed that as intimated in the 139th OCC meeting, the scheme would not be split into two (of static and dynamic reactors) and reply would be sent to PSDF approval committee clarifying their reservations. 37 th TCC/40 th NRPC meeting:- POWERGRID was requested to commission TCR of capacity 500 MVAr at Kurukshetra 400 kv bus at the earliest citing the stabilization of Champa-Kurukshetra HVDC link. 141 st OCC meeting: POWERGRID informed that the reactor would be commissioned within 30 months. MS, NRPC enquired from POWERGRID as to why 500 MVAr TCR at Kurukshetra was not incorporated at the planning stage of the substation. POWERGRID representative informed that, the requirement of the reactor has arisen due to higher system voltages prevailing at Kurukshetra. He further stated that at the time of planning, normal voltages were assumed and the system was designed accordingly. MS, NRPC stated that for future planning, real ground conditions need to be taken into account for obtaining realistic requirements. Representative of NRLDC queried NTPC regarding the status of commissioning of 125 MVAr Bus reactors at Dadri. NTPC informed that the same would be commissioned by 1/2018 and the delay was on account of problems being faced at site in laying the foundation of the bus reactor as water logging problem is persisting. Representative of Punjab cited that the reactor approved in the Standing committee meeting did not include the reactor at 400 kv Nakodar as listed in the table. However, he was informed that the minutes of the 39 th SCM available on CEA s website included the same. 40 th NRPC had also advised all the utilities to commission the reactors at the earliest and to submit the detailed action plan with the timeline in the next OCC meeting. NRPC had further pointed that these reactors are essential for maintaining the voltage level of the grid and needs to be commissioned within 26 months. In the meeting, all the utilities were requested to submit detailed action plan along with the timeline for execution of the approved reactors before next OCC meeting. 10. System Protection Schemes (SPSs) in Northern Region: 10.1 SPS for Interruption of import by NR at 765 kv Agra (from WR). 15

16 Review of SPS for 765 kv Agra-Gwalior line The revised SPS for meeting contingency of 765 kv Agra-Gwalior was approved in 32 nd TCC/36 th NRPC meeting held on 23 rd /24 th December, It was also agreed in the 36 th NRPC meeting that POWERGIRD would implement the revised scheme within 06 months after the receipt of the feeder details from the States. 39 th meeting of NRPC held on approved the proposal of POWERGRID given in the 129 th OCC meeting for booking the cost of revised SPS including 05 years AMC in some other on-going project/work. 138th OCC meeting: POWERGRID informed that the scheme would be implemented by th OCC meeting: POWERGRID stuck to the date given in 138 th implementation by OCC for 140 th OCC meeting: POWERGRID informed that the technical bid wass under evaluation and the LOA would be placed by November th TCC/40 th NRPC meeting: POWERGRID informed that the delay in the tendering process was because of the implementation of GST and the Letter of Award (LoA) would now be placed by November 2017 with the completion schedule of February Ist OCC meeting: POWERGRID assured that they plan to adhere to the target date of February 2018 Mapping of Feeders in SCADA 135 th OCC meeting: The concern was expressed about no progress made by the state utilities so far regarding mapping of feeders in SCADA, identified for the SPS load relief. OCC advised all concerned utilities in the meeting to take action in this regard at the earliest and inform the action taken. 136 th OCC meeting: The Sub-Committee was informed that mapping of feeders in SCADA, identified for SPS load has been implemented by HVPNL and partly by Rajasthan. Other utilities were requested to implement the same at the earliest. 139 th OCC meeting: All the utilities except RRVPNL & HVPNL who have implemented mapping of feeders in SCADA identified for SPS load were again requested to implement the mapping of feeders in SCADA at the earliest. 140 th OCC meeting: In the meeting it was informed that Punjab has also mapped their feeders in SCADA. Representative of UP informed that the mapping of feeders in their state was being done. 141 st OCC meeting: In the meeting members were informed about the Compendium of SPS in NR (Annexure-9) which was released in the 40 th NRPC meeting. All the utilities were requested to go through the compendium and identify feeders concerning their state and map the same in SCADA. 16

17 Mock Testing of SPS for 765 kv Agra-Gwalior line POWERGRID representative had stated that in view of recent multiple tripping at Agra Sub Station, the Mock Testing of SPS for 765 kv Agra-Gwalior line was required. After deliberation it was decided that the same may be done on from 7:00 to 11: th OCC meeting: Representative of POWERGRID gave a presentation on the changes in the logic implemented by them. NRLDC stressed the need to look into the changed logic as there was a chance of mis-operation of SPS in case of gradual load throw-off within 7.2 seconds even when both the lines were in service. A meeting was held on at NRPC Secretariat to discuss the logic of SPS for 765 kv Agra-Gwalior Line. In the meeting it was stated that as the OPGW laying has been completed for the line, signals from circuit breakers from both the ends shall be used for ensuring the status of availability of the line rather than going for power order, as per present practice. Representative of POWERGRID informed that for taking the signals of circuit breaker through OPGW, telecom equipment needs to be installed at both the ends which would require regular tendering process and would take time. He assured of looking into the matter. For the time being, based on the past experience, it was decided that for the Condition 4 and condition 5 of the implemented logic, the MW DIFF shall be calculated between 1 st and 6 th register and not between 1 st and 10 th register as it may lead to misoperation of the SPS. It was also decided that these settings shall be monitored and changed accordingly in future. 141 st OCC meeting: Representative of NRLDC informed that the above logic shall be implemented for the time. However, he requested POWERGRID to search for avenues for getting the signal from circuit breaker from both the ends for verifying the status of availability of the lines. He informed that, in the presently implemented scheme a signal is being sent to Gwalior S/S from Agra S/S for providing further signal for backing down generation in WR. He requested POWERGRID to look if some modifications can be made in the communication equipments at Gwalior for getting the status of CB at Agra end. POWERGRID informed that they would look into the matter SPS for ICTs at 765 kv Unnao sub-station: A discussion was held on in NRPC secretariat with the officers from UPRVUNL in the presence of officers from NRLDC, POWERGRID and NRPC sect. UPRVUNL was briefed about the basic philosophy along with the hardware requirement of the System Protection Scheme (SPS) for evacuation of Anpara-D generation. It was agreed that UPRVUNL along with UP SLDC would prepare the SPS for safe power evacuation of Anpara-D. Further the scheme would be submitted to the OCC for approval. Thereafter, the matter was under discussion in meetings of OCC without much progress. 121 st OCC meeting: It was decided that, the scheme was to be implemented by UPPTCL. 17

18 34 th TCC/38 th NRPC meeting: UPPTCL informed that LOA would be placed by and scheme would be implemented in next 3 months. 137 th OCC meeting: UPPTCL informed that implementation of the scheme will be done by th OCC meeting: In the meeting representative of UPPTCL informed that the work has already been completed at Unnao end. However, the contacts required from the generating end were not obtained as those could be obtained only when the unit would be under shutdown (as informed by UPRVUNL). 139 th OCC meeting: In the meeting it was again informed that the contacts required from the generating end were still awaited. Rest all work stands completed and the scheme would be implemented as soon as the contacts are obtained. 140 th OCC meeting: Representative of UPRVUNL informed that for incorporating the logic of SPS in their CMC (Coordinated Master Control) offer has been asked for from BHEL. Concerns were raised by members for the delay in implementation of the scheme on account of incorporating the logic of SPS in CMC as the logic for the scheme has been decided way back. Representative of UPRVUNL informed that the scheme would be implemented by November st OCC meeting: UPRVUNL representative intimated in the meeting that the work at Unnao end stands completed. Further he intimated that the offer to incorporate the logic of SPS at Anpara D has been received and the order shall be placed by them very shortly. He assured that the work is expected to be completed by He also stated that the cost of the logic of SPS at Anpara D is to be indemnified by UPPTCL SPS for Kawai Kalisindh - Chhabra generation complex: SPS for Kawai-Kalisindh-Chhabra generation complex was recommended in 122 nd OCC meeting held on 22 nd April, RVPNL, vide dated has confirmed that the SPS for Kawai-Kalisindh-Chhabra generation complex has been put into operation. However, it is observed that the automatic load shedding recommended in part (c) of the scheme has not been implemented by RRVPNL. The scheme was discussed in 34 th TCC/38 th NRPC meeting held on 24 th /25 th October, 2016 wherein RRVPNL stated that feeders have been identified and the scheme would be completed by March th OCC meeting: Rajasthan representative intimated that, the part of the scheme related to load shedding would be completed by March, st OCC meeting: Rajasthan representative intimated that load shedding part of the scheme has been installed on trial basis for 100 MW load. Mock testing of the SPS would be done for the shortlisted load and if successful the scheme would be extended for complete 700 MW load. OCC advised RVPNL to implement the SPS scheme for the identified load at the earliest and submit the report to NRLDC and NRPC Secretariat. 133 rd OCC meeting: Rajasthan representative submitted that the administrative approval for implementation of the Automatic Load shedding for identified feeders have been obtained and the NIT for the work would be floated soon. Regarding revision in SPS scheme after commissioning of Chhabra stage - II (Unit 5), RVPNL representative stated 18

19 that the same is under consideration and information in this regard would be submitted shortly. 134 th OCC meeting: Rajasthan representative intimated that the scheme has been revised upon the commissioning of Chhabra stage II. On the query regarding quantum of backing down of generation with N-1 contingency of 400 kv Kawai-Anta Ckt.- 1 & 2 and 765 kv Anta-Phagi Ckt.- 1 & 2, representative of RRVPNL intimated that generation will be reduced to 65 % of the installed capacity. OCC suggested RRVPNL that the reduction in generation up to 60 % of the installed capacity in the above mentioned contingency may be considered. RRVPNL agreed to review the scheme. 135 th OCC meeting: RVPNL representative intimated that the issue was being discussed with the Generation Company. As per the letter received from CE PP&D RRVPNL a meeting was held on in light of the issue of revision in existing SPS scheme for Kawai, Kalisindh & Chhabra complex due to addition of Chhabra SCTPS Unit 5. In the meeting representatives of the four generating companies opined that technically it is not possible to reduce the generation up to 60%. They insisted that backing down may not be reduced beyond 65% because it may result in instability. After deliberation it was decided that 65% backing down of generation may be considered for SPS at Kawai, Kalisindh, Chhabra & Chhabra Super Critical Complex. Till the new scheme is implemented the existing approved scheme will stay in operation. 136 th OCC meeting: Members were of the view that this complex being very important for the power supply of Rajasthan, the recent incident of complete generation loss of the complex needs to be avoided. Keeping in view the importance of the complex, the members advised Rajasthan to go forward with their proposed backing down for the time being. However, it was cited in the meeting that as per new regulations prepared by CERC, the generators will be required to back down their generation up to 55%. 137 th OCC meeting: Rajasthan representative informed that NIT would be floated in July 2017 and the scheme will be implemented by Dec th OCC meeting: Representative of Rajasthan informed that revised SPS scheme for Kawai-Kalisindh-Chhabra generation complex due to addition of Chhabra SCTPS (Unit#5) has been intimated to the concerned department for implementation. He stated that the Chhabra SCTPS (Unit#5) would be allowed to be commissioned on implementation of the scheme. Regarding the automatic load shedding scheme, it was informed that bid would be opened on and the scheme would be implemented by th OCC meeting: The representative of Rajasthan informed that all efforts are being made to implement the scheme by th OCC meeting: The representative of RVPNL informed that the technical bid has been opened on and the implementation of scheme shall be done as per schedule. 141 st OCC meeting: The representative of RVPNL informed that the tendering process was in progress and all out efforts are being made to implement the scheme as per target date of

20 10.4 SPS for Lalitpur Generating station: 3x660 MW LPGCL Power Station is connected to the Grid through 2xS/C 765 kv Lalitpur- Agra (Fatehabad) lines and 220 kv D/C lines to Lalitpur and Jhansi. 3 rd PASG meeting, 11 th July 2017: In the meeting it was observed that UP has put in place some System Protection Scheme (SPS) at Lalitpur for taking care of tripping of 765 kv Lalitpur - Fatehabad lines though the scheme has neither been put up for approval in NRPC nor the details have been shared with NRLDC. It was decided to bring the implemented scheme for approval to the OCC forum. 137 th OCC meeting: In the meeting, OCC was briefed about the implemented scheme at Lalitpur TPS. OCC after due deliberation suggested some modifications in the already implemented SPS scheme and advised LPGCL to discuss the same with UP in a separate meeting. Representative of LPGCL was requested to take up the issue on priority basis and also to brief the committee about the same before implementing. 138 th OCC meeting: In the OCC meeting it was informed that, a separate meeting between LPGCL and UP SLDC was held on wherein the logic for the scheme was figured out. Minutes of the meeting were awaited and would be forwarded to NRLDC and NRPC Secretariat once they were finalized. UP SLDC representative requested to submit the draft logic as approved in their meeting with LPGCL to NRLDC and NRPC secretariat before finalizing the same so that the issue is expeditiously finalized. 139 th OCC meeting: In the meeting, it was informed that the draft logic has been submitted to NRLDC and NRPC secretariat. It was intimated that the scheme would be implemented by th OCC meeting: The representative of UP (SLDC) informed that the comments of NRLDC have been intimated to the generating stations for incorporating in the logic. It was further informed that the scheme would be implemented as per the schedule by NRLDC representative had requested UPPTCL to implement the scheme and if required modify it later on. 141st OCC meeting: UPPTCL representative intimated that the scheme has been commissioned at LPGCL end. If any 765 kv Lalitpur-Agra line trips, SPS would operate for their complex. He further stated that the signal at FATEHBAD end has not been received. The issue was being looked into so that work can be completed by System Study for Capacitor Requirement in NR for the year & In 34 th TCC and 38 th NRPC meetings, held on 24 th & 25 th Oct, 2016 the matter was discussed and it was decided that LOA should not be cancelled and the study should be carried out for the year and through CPRI. It was also decided that all the States would submit the data by for carrying out study for the period Subsequently, the data would be submitted for carrying out study for rd OCC meeting: Sub-Committee was apprised that data for had been received from all the utilities and the same has already been sent to CPRI. Based on the 20

21 data submitted by the utilities CPRI carried out the capacitor study. The report submitted by CPRI for is available on NRPC website ( 135 th OCC meeting: Sub Committee was informed that the proposal of installation of capacitor by Haryana, Punjab, Uttar Pradesh and J&K through PSDF funding was approved in the 35 th TCC/39 th NRPC meeting held on 1 st & 2 nd May, 2017 as per recommendation of OCC and the same has been referred to the Convener, Techno Economic Sub Group & Consultant NLDC for PSDF Funding on Utilities noted the information. 136 th OCC meeting: All the utilities were requested to submit the comments if any to the proposed capacitor requirement in the report by CPRI. Only Rajasthan has submitted the comments. 137 th OCC meeting: Utilities were asked to submit the action plan for the implementation of the requirement as recommended in the report. Comments on the report were received from RVPNL and DTL and the same were discussed with CPRI. After the discussion, CPRI has submitted an amended report ( stands uploaded on NRPC website) wherein clarification is provided for Table 11 of the draft report, in which, recommendations are made regarding the quantum of additional capacitor bank needed to be installed along with those that needs to be switched ON from the existing ones. 138 th OCC meeting: Modified report as submitted by CPRI (based upon the comments of Rajasthan & Delhi) was put before OCC. Utilities were requested to go through the revised report and submit their comments if any to the same. Rajasthan representative stated that the specific comments of their STU would be submitted after the meeting. UP, SLDC raised issue of difference in given data and considered data for study in the revised CPRI report. After clarification from CPRI, it was informed that data as per the PSSE file was used to study due to inability in identifying the upstream substation corresponding to data submitted by states utilities for 11kV/33kV substations where capacitor are actually connected. 139 th OCC meeting: In the meeting, representative of UP had some reservations regarding the operational quantum of capacitor of capacitor bank being reflected in the report. It was informed that, the figure mentioned in the report was MVAR, however, it was somewhere in the range of 5000 MVAR operational in their system. Representative of CPRI in the meeting assured that rechecking of the data incorporated in their study would be done. He further informed that, during the study, help of power maps available on UPSLDC s website was also taken as it was not possible to trace the details of upstream substation for the capacitor submitted at 11kV and 33 kv level. In the meeting the issue of identifying the 11kV and 33kV feeders corresponding to the recommendation of CPRI for capacitor installation (recommendation made at 220kV and 132kV substation by lumping the downstream network) was also discussed. It was opined that, for a radial system the requirement as recommended can be more or less equally 21

22 distributed among the downstream feeders. However, for a connected system it would not be possible. For the study of capacitor requirement for , it was proposed to conduct the study at 11kV/33kV level in order to obtain more feasible and practical requirement of capacitors in case the system at 220/132/66kV was not radial. However, if the system is radial, then the requirement of capacitors assessed by the CPRI may be proportionately translated up to 11kV level. States informed that most of the system is radial. Therefore capacitors study could be done as per original proposal of CPRI for also. 140 th OCC meeting: In the meeting representative of UP (SLDC) again raised the issue of the quantum of capacitor banks incorporated in the study by CPRI. EE(O), NRPC intimated that the comments of UP has already been sent to CPRI and further suggested that the utilities could also take up the issue directly with the concerned personnel in CPRI (Dr. Manohar Singh, Mob No , manoharsingh@cpri.in ). Rajasthan has submitted some comments regarding the quantum which was reported as Not in operation in the report, for which it was clarified that this quantum represents the capacitor those were not connected to the system at the time for which the study was performed. It was further clarified that it did not reflected the quantum of defective capacitor banks. Representative of Rajasthan also intimated that most of the 220kV and 132kV substations of Rajasthan were connected in the ring and only few were radial. Rajasthan representative also stated as under: Regarding study of capacitor requirement for , they plan to conduct their own study for assessing the capacitor requirement considers actual data of power factor and MVAR injection of load at the 33 kv level and other factors such as generator directly connected at 33 kv voltage level etc. In addition to above mentioned installed capacitor banks MVAR (81Nos. X 5.43MVAR) more Capacitor banks are already under installation. 37 th TCC/40 th NRPC meeting: The issue of study for was discussed in the 37 th TCC/40 th NRPC meeting. In the meeting it was proposed to conduct the study in two stages: i. One at 220/132 kv level ii. Subsequently down to 66/33/11 kv level As it would involve a huge task of collection of data it was also agreed to conduct the study of capacitor requirement for at 11kV/33kV/66kV level. NRPC approved the proposal for conducting the study of capacitor requirement for at 11kV/33kV/66kV level and also for the additional charges which may be levied by CPRI for conducting the study to be paid from NRPC fund. 141 st OCC meeting: Members were briefed about the decision of NRPC for conducting the study for at 11/33/66 kv level. All the utilities were requested to timely submit the data for their network for successfully conducting the study. 22

23 Rajasthan had informed in 40 th NRPC meeting that they would be conducting study for the Rajasthan on their own. In the meeting Rajasthan was informed that for the study data would also be required from their state and were requested to provide the same whenever required. All Utilities were requested to submit the action plan for the implementation of the capacitor requirement as recommended in the study conducted by CPRI for te year Status of data through Automatic Meter Reading (AMR) In the 13 th NRPC meeting held on 27 th June 2009, scheme of Automatic Meter Reading from Interface Meters in Northern Region was approved. NRLDC and POWERGRID were to submit the joint status report of AMR at the end of every month. In the 34 th TCC meeting, held on 24 th Oct, 2016, NRLDC stated that out of 1235 interface meters, data from 973 meters was being received and being regularly used by NRLDC for 764 interface meters. POWERGRID informed that the data from all the meters will be available by January TCC and NRPC expressed concern over tardy progress of the implementation of AMR. The progress of installing AMR is being regularly mentioned in OCC meetings. 133 rd OCC meeting: POWERGRID updated that the work would be completed by April, th OCC meeting: POWERGRID representative raised their concern over lack of support from site in matters regarding AMR implementation. He informed that site personnel are downloading SEM data manually by removing wiring and in many case not plugging it in, despite of provision for downloading the data manually even when meter is plugged in. The issue has also been communicated to the site, but still not resolved. 136 th OCC meeting: The joint report of NRLDC & POWERGRID was submitted. Sub- Committee had advised all the transmission and generation Utilities to co-operate with the vendor to resolve the issues regarding ORU removal for manual downloading of data from SEMs. 137 th OCC meeting: The Status was updated by POWERGRID & NRLDC 138 th OCC meeting: The Status was updated by POWERGRID & NRLDC.On the issue of provision of the prospective plan of 5 minute scheduling in the AMR, Power Grid was asked to take up the matter with the manufactures so that adequate provision for the same can be made in the new AMR being installed. 139 th OCC meeting: The Status was updated by POWERGRID & NRLDC On the issue of provision of the prospective plan of 5 minute scheduling in the AMR, Power Grid representative expressed their inability to get modifications made for 5 minute scheduling. They further stated that once the regulation is notified they will take the further necessary action. 140 th OCC meeting: The Status was updated by POWERGRID & NRLDC Power Grid representative informed that still non reporting of data is being faced at some locations. It was stated by them that the representative of M/S Kalkitech has been duly advised to rectify all the AMR issues from where the meters are not reporting data by end of October. Also they proposed that the representative of the firm was stationed at 23

24 NRLDC and their concerned officer may coordinate with him for expediting the work and rectification issues wherever faced. NRLDC representative informed that issues were regularly discussed with M/s Kalkitech, POWERGRID and field officers. Following issues are being reported: Sim card/ network issues Optical cable connectivity issue Manual opening of optical cable for fetching the data from meter and forget to connect Implementation pending Intermittent data For station wise reporting, NRLDC would mention name of the location and type of issue in its discrepancy report for the information of all. NRPC suggested all the utilities for proper training of field officers for data fetching without opening of optical cable. POWERGRID shall also take care the issue of SIM card network. Further it was proposed by SE NRPC that a meeting will be called in Third week of November regarding discussing the provision of the prospective plan of 5 minute scheduling in the AMR. 141 st OCC Meeting: The NRLDC representative gave a presentation regarding the AMR STATUS (Annexure 12). NHPC representative highlighted the issues regarding the AMR installation and problems being faced at some stations. They were advised to take up the issue with Power grid. Further NRLDC representative highlighted that the AMR project is being got implemented by POWERGRID. Regarding the problems being faced at BBMB stations it was highlighted that the matter may be taken up by Power grid only. SE ( Commercial) NRPC stated that the Commercial Coordination meeting is scheduled in to be held and the problems regarding AMR can be brought forth in the meeting. Further he proposed that a meeting with Power grid and the firms installing/ having installed (Kalkitech and Elster), the meters will be called thereafter. 13. Planning, procurement and deployment of Emergency Restoration System. The issue was discussed in the 33 rd meeting of NRPC held on and it was suggested that CEA should evolve guidelines regarding ERS. Later, Secretary (Power), GoI vide letter dated addressed to Chief Secretaries of all the States, had requested to issue directions to transmission utilities / transmission licensees to procure adequate number of Emergency Restoration Systems. The guidelines formulated by CEA for planning, procurement and deployment of Emergency Restoration System were also enclosed with that letter. The matter was discussed in 34 th TCC and 38 th NRPC meetings, held on 24 th & 25 th Oct, 2016 and the subsequent meetings. The latest status as updated by the members in 141st OCC is as under: DTL :- Order had been placed for 02 nos. of ERS. Delivery has been completed. Training imparted in September PSTCL: - Order has been placed. Supply expected by End November, UPPTCL: - 02 nos. of ERS have been received. 24

25 RRVPNL: - Will not be procuring HVPNL: - PTCUL- HPSEBL BBMB - J&K- Earlier it was informed that in place of ERS, spare towers would be procured worth Rs Two crore. In 138 th OCC it was informed that the management is reviewing the issue of procurement of ERS.In 141 st OCC meeting, HVPNL representative present intimated that it has been decided by HVPNL to procure I SET of ERS.MS NRPC lauded the decision of HVPNL and it was requested that documents/ details in regard of the procurement of ERS be submitted. NIT placed. Supply expected in 3 month. Representative present intimated that the status has not been updated by STU of PTCUL still. Discussions being held with vendor. Suitability of ERS for critical locations is being explored. Representative present intimated that the updated status from STU will be intimated within a week. Partner states have agreed to provide the ERS as and when required by BBMB. MS, NRPC observed that Rajasthan a partner state of BBMB has not yet reviewed the decision of procuring ERS. The same needs to be taken by BBMB with Rajasthan Order has been placed for 2 nos. ERS. In the meeting, Director (GM Division), CEA, informed that it is mandated in the Central Electricity Authority (grid Standards) Regulations, 2010 for the utilities to have Emergency Restoration System. Utilities were informed that not having ERS would be a non-compliance of the CEA regulations. 14. LVRT issues of wind/solar generation As per the CERC order dated issued in Petition No. 420/MP/2014 wherein CERC has directed that LVRT should be implemented for all wind turbines (except Stall Types) commissioned before having installed capacity equal to or more than 500 KW. Further as per the CEA Technical Standard for connectivity to the Grid (Amend.) Reg.2013 (sub clause (3) of Clause B 2 ) of the station connected to the grid 06 months after publication of these regulations (i.e ) shall have the LVRT capability as depicted in the sub-clause. As LVRT are not installed on many of the wind turbines in State of Rajasthan, the issue is being regularly raised in the various meetings of NRPC without any result. 137 th OCC meeting: RVPNL representative informed that no progress has been made even after regularly pursuing for the same. Sub-Committee advised RVPNL to submit a petition to the State Regulatory Commission for the non-compliance of the regulations. Subsequently a letter from the NRPC Secretariat has also been written to Chairman RRVPNL on the issue. 138 th OCC meeting: RVPNL representative informed as under: The updated status of LVRT for wind generators stands submitted. Further as per directions of NRPC in 134 th OCC meeting regarding installation of LVRT on wind generators, the SE (REMC) has been requested repeatedly to take up the issue with wind generators for ensuring compliance of CEA Regulations and CERC orders in this regard. 25

26 As per the advice of the Sub-Committee in 137 th OCC meeting, the case has been forwarded to REMC wing to submit a petition to RERC for non-compliance of regulation. 139 th OCC meeting: Representative of RVPNL informed that matter is being taken up. 140 th OCC meeting: In the meeting it was informed that matter was under approval. In the 37 th TCC/40 th NRPC meeting representative of RVPNL stated that the proposed petition has been submitted to the management for its consent and it would be submitted to the RERC by next month. 141 st OCC meeting: Representative of RVPNL informed that the matter is under finalization and will be submitted to RERC as per the commitment given in the 37 th TCC/40 th NRPC meeting. 15 RGMO/FGMO compliance by generators in the region (Agenda based on letter by CERC) CERC (IEGC) 5 th amendment of IEGC dated provides that all Coal/lignite based thermal generating units of 200 MW and above, Open Cycle Gas Turbine/Combined Cycle generating stations having gas turbines of capacity more than 50 MW each and all hydro units of 25 MW and above should provide RGMO/FGMO response. Further, it has been provided at Regulation 5.2(h) that RLDCs/SLDCs should not schedule the generating station or unit(s) thereof beyond ex-bus generation corresponding to 100% of the installed capacity of the generating station or unit(s) thereof and that the generating station shall not resort to Valve Wide Open operation of units so that primary response is ensured. CERC in its letter dated has directed to obtain the status of availability of RGMO/FGMO response from the generators (ISGS as well as intra-state generators) in the region. 136 th OCC meeting: All utilities were requested to submit the status of actual response being provided by generators under the primary response. SLDCs were asked to provide the region report by th OCC meeting: All SLDCs were again requested to submit the detailed status of actual response being provided by generators under the primary response by th OCC meeting: The updated status of units operating under RGMO/FGMO was received from NTPC, NHPC, PTCUL and NPCIL in the meeting. The latest status of RGMO/FGMO as available with NRPC is once again attached in ANNEXURE 15 of the Agenda of the 139 th OCC meeting. 139 th OCC meeting: RRUVNL &UPRVUNL submitted the status in the meeting. All the remaining utilities were requested to check and update the status. 140 th OCC meeting: UPRVUNL submitted the information. All concerned utilities were again requested to update as per the information asked in 138 th OCC meeting. 26

27 NTPC representative stated as under: Regarding confirmation sought for RGMO implementation at Gas Stations from , NTPC stated that RGMO mode has been put in service at Auraiya, Dadri-Gas Moudle-1 and Faridabad gas stations. However, the same is under observation as some deviations are observed in performance w.r.t to IEGC provisions. The issues have already been taken up with OEMs and are expected to be resolved by Nov 17 end. Anta gas station is operating in FGMO with Manual Intervention mode. RGMO will be implemented in GT-2 during planned S/D from to Subsequently, GT-1 and GT-3 will be taken for 2 days S/D each for facilitating modification of software in control logic by OEM. NRPC agreed for the S/D program of Anta. NRLDC representative also requested all the generators that droop setting as well as any other setting shall also be given also with data. He also emphasized that all generators shall give a plan of action by next OCC meeting for providing telemetry of RGMO/FGMO in service indication. The requirement and action on this has already been agreed in previous OCC meeting. The updated status is enclosed at Annexure 15.All concerned utilities may update the information as desired in the last TCC & NRPC meeting. Also the work of mapping of RGMO/FGMO status, in SCADA should be expedited so that it would be completed within 3 months as desired in the last TCC & NRPC meeting. 16. Phase mismatch issue with BBMB and interconnected stations During the discussions held in 34 th PSC meeting, it was reported that phase sequence of BBMB at the interconnection with other utilities, do not match with that of the other utility. It was observed that, this problem leads to a lot of confusion during charging of interconnected lines and also to other coordination problem while reporting any issue. While deliberating it was observed that, the main issue was primarily of the nomenclature of phases at BBMB end and based on the discussion it seems that the nomenclature of phases at BBMB end has inadvertently been marked as mentioned below: Phase of the grid R Phase Y Phase B Phase Corresponding nomenclature of the phase at BBMB end B Phase R Phase Y Phase In view of the above BBMB was asked to rectify the nomenclature issue at their end which leads to coordination and other problems while reporting. 138 th OCC meeting& 139 th OCC meeting: BBMB representative informed that the issue of mismatch of phases is being looked into and would be rectified at the earliest. 140 th OCC meeting: The representative of BBMB informed that a committee has been constituted by TS organization of BBMB. The committee would submit its report by 30 November

28 141 st OCC meeting: The representative of BBMB assured that the committee would positively submit its report by 30 November Operation of hydro power projects in peaking mode POSOCO has carried out operational analysis of various hydro stations in the country and observed that despite 40.6 GW of peaking hydro capacity, only about 33 GW peak generations is carried out on all India basis. According to POSOCO, this is on account of a number of hydro stations, particularly in state sector, which are not being operated in peaking mode. In order to examine the above observation, a sub-committee has been constituted by the MoP under Chairperson, CEA with heads of POSOCO, NHPC, SJVN & THDC as member and Director (H), MoP as the member convener. The sub-committee has held three meetings with the concerned hydro generating stations and concluded that there is scope for about 2000 MW additional power generation from hydro stations during peak hours. Based on the deliberations at the meetings of the Committee, Chairperson, CEA has advised to discuss the above operational analysis & the matter of utilization of hydro stations in peaking mode be discussed at the monthly OCC meetings while discussing operational planning for the month ahead and analyzing the operation in the previous month. In the meeting all members were advised to go through the report on the and then submit the comments on the issue in the next OCC meeting. 18. Regarding change of relay setting from Auto reclose to Non-auto reclose mode (Agenda by Power grid). Relay setting may be changed from Auto reclose to Non-auto reclose mode for OPGW LIVE LINE stringing works in following lines. As per NLDC auto reclose mode changing on long duration may be approved by NRPC. a. 765kV S/C Meerut- Greater Noida line for Nov 2017 to 31 st Dec 2017 (52 Kms out of 125 kms OPGW laying Completed)- WIP b. 765kV S/C Greater Noida to Agra line 15 th Nov to 31 st Jan c. 400kV S/C Agra- Bassi line - for Nov 2017 month (209 Kms out of Kms OPGW laying Completed)- one drum pending shall be start from 7/8 th Nov 2017 d. 400kV D/C Neemrana-Sikar line ckt-i for Nov 2017 to 31 st Dec 2017 (70 Kms out of 178 kms OPGW laying Completed) WIP e. 400kV D/C Dadri-Maharanibagh line - 15 th Nov to 31 st Jan f. 400kV D/C Hissar-Bhiwadi line - 15 th Dec to 31 st Jan g. 400kV D/C Gorakhpur PG-Gorakhpur UP line - 15 th Dec to 31 st Jan h. Balance work of 400kV Ballabhgarh PG- Bamnauli DTL line from 15 th to 30 th Nov 2017 (10Kms OPGW work pending due to non issuance of PTW by DTL even in live line condition). The above proposal was discussed and approved. However NRLDC representative stated that the outages should be applied for one by one & the same will be approved in real time seeing the grid conditions as in winter frequent tripping are there. He further added that these outages would be allowed only on daily basis. 28

29 NRLDC AGENDA 19. Reliability issue of Kashmir valley NRLDC presented issues related to Kashmir valley wherein following reliability issues with Kashmir valley power system were presented: i. 400/220 kv Wagoora (main supply point) where 4x315 MVA ICTs remain fully loaded during winter months and therefore N-1 criteria gets violated. High MVAr drawl is reported at Wagoora S/s which results in low voltages. ii. 220 kv lines from Wagoora (220 kv Wagoora-Ziankote D/C and 220 kv Wagoora-Pampore D/C) remain loaded up to MW and therefore N-1 criteria gets violated. iii. Low voltages are experienced due to high loading of intrastate network of valley power system. iv. Tripping of connecting 400 and 220kV lines during inclement weather of high snowfall/storm and thus valley islanding and collapsing is observed. Plot showing above reliability constraints from to was also shown in the meeting. High ICT loading at Wagoora High loading of 220kV lines from Wagoora High MVAR drawl at Wagoora NRLDC representative further stated that owing to the constraints as shown above, in a recent incident on at 15:34hrs, jumper snapped at Pampore end of 220kV Wagoora-Pampore ckt-1. (SOTF, LBB operated) LBB lead to Bus Bar Protection operation for 220kV Bus-1 at 400/220kV Wagoora (PG) which lead to tripping of 400/220kV 315MVA ICT-1 & 3 at Wagoora PG, 220kV Wagoora-Pampore ckt-1, 220kV Wagoora-Zainkote ckt-1. Load loss of ~350MW was seen in this case as 220kV Wagoora- Pampore ckt-2 was out under maintenance. Due to lack of representation from J&K, actions taken by them were not available, but it was agreed that J&K state utility needs to take actions for tackling issues highlighted above so that no inconvenience is faced by the general public in this winter season and in future. 29

30 20. Prolonged outage of transmission elements NRLDC representative highlighted elements under prolonged outage as shown below: 30

31 No. Of days for which outages have been present is depicted as under: NTPC representative stated that 315MVA ICT at Auraiya is expected to be revived within few days (oil sample has been sent for testing). RRVPNL representative informed that at time of charging oil got accumulated inside air-cell and thus CGL didn t give permission to charge the ICT. Revival of ICT is expected to take days more. Haryana representative stated that revival of 400kV Jhajjar-Mundka is getting delayed due to ROW issues and revival would take 30 days more. DTL representative informed that revival of 400kV Mundka-Bawana is expected till mid-december. NRLDC representative expressed concern for early revival of FSC of 400kV Koteshwar- Meerut #2 at Meerut as oscillations were seen in the grid on 9 th Nov due to tripping of one out of two evacuation lines for Tehri and Koteshwar generation as described in additional agenda points later. All utilities were requested to make all out efforts to revive the elements that have been in long outage. 21. Under generation by ISGS on continuous basis NRLDC representative stated it was observed that some of the NR generating stations are generating less than their schedule & poor frequency profile is also observed during the same time. This issue has been highlighted in previous OCC meetings however it has been observed that still some generators have generated less than their schedule on regular basis. Some of the generators which have generated considerably less than their schedule from 24/10/17 to 12/11/17 are listed below with net MUs (UI deviation): 31

32 Date/Station / Constituent Dadri I STPS Dadri II STPS ISTPP (Jhajjar ) Dadri GPS Anta GPS NAPS RAPS- C Net MU (UI figure)* *data taken from DO reports of NRLDC for above dates 32

33 NRLDC representative stated that RAPS-C, Jhajjar, Dadri Th-1 & Th-2, Dadri Gas have undergenerated on continous basis while NAPS generation remained lower on & NTPC representative stated that Dadri Thermal generation was lower due to high frequency in the grid. All Dadri plants are normally given RRAS schedule, therefore due to sudden changes in schedule at time of ramping up there may be chances of some under generation. For gas stations such as Anta, Auraiya & Dadri there are many start & stop operations which may lead to slight under generation. NRLDC representative stated that these issues are highlighted to make the generators aware of any under generation by them and increase monitoring. He further added that as visible from the data shown the generators highlighted above have under generated for most part of the month and not on one or two instances. Thus, this under-injection does not appear to be result of high frequency. NTPC representative added that daily report is being sought by higher authorities to monitor such instances. NRLDC representative stated that from 00:00hrs onwards on RAPP-C had given DC of 430MW; NRLDC had scheduled the same quantum to them. However, RAPP-C continued to generate MW even when it was given schedule for 430MW. RAPP-C DC (declared capacity), schedule and actual generation are shown in above fig. It is also visible that generation at RAPP-C remained in range of MW for most of the time and followed a cyclic pattern on daily basis. Representative stated that DC was declared 10 MW more than actually it should have been and that was the reason for this under generation. He added that instructions have 33

34 been given to plants to check DC before forwarding it to NRLDC. He also said that they would try to identify reason for cyclic pattern as seen from graphs. NAPS representative stated that under generation on & was due to wrong data entry at their end and instructions have been given to avoid such instances in future. MS NRPC stated that all generators shall strictly follow their schedule as variation from schedule leads to poor frequency profile as visible from the past few days. All agreed that there should be strict adherence to schedules by the generators. 22. Monitoring of scatter plots for ICTs and taking actions wherein MVAR flows are observed from 220 kv to 400 kv side. NRLDC representative presented scatter plots for 400/220kV (few 765/400kV) nodes of Northern region for the month of October 2017 attached as Annexure-22. It was highlighted that as per NRPC reactive energy account for week of Oct 2017 (taken as sample) Delhi and Jammu & Kashmir had to pay reactive energy charges due to MVAR injection at high voltage. MVAR injection at particular nodes on HV for all states is given below: State control area Punjab Haryana Rajasthan MVAr Injection at 400kV on High voltage (>1.03pu) as per NRPC REA for week of Oct 2017 Ganguwal, Gobindgarh, Barnala, Ropar, Amritsar (PG), Moga(PG), Jalandhar Bahadurgarh, Gurgaon, Deepalpur Hissar, Khetri, Bhinmal, Heerapura, Jaipur South, Kota & Sikar Delhi Uttar Pradesh Uttarakhand - Himachal Pradesh Jammu & Kashmir Bamnauli, Mundka, MaharaniBagh, Narela Anpara, Mainpuri(PG) Jassore - NRLDC representative stated that except J&K & Delhi all states had net charges as receivable but situation could further improve if adequate actions are taken at these highlighted nodes as these nodes have MVAR charges throughout winter months. States were again requested to analyze their reactive energy account charges available on NRPC website on weekly basis. This would help in identifying the nodes where MVAr injection is being done from 220kV side to 400kV. Thus, appropriate remedial actions at these nodes would not only improve the voltage profile but also reduce burden of penalty being imposed on account of reactive energy charges. 34

35 Punjab SLDC representative added that they have also plotted scatter plots for 400/220kV nodes under their jurisdiction using excel file provided by NRLDC and they would further be plotting scatter plots for 220/132kV nodes and take actions as required. MS NRPC asked all states to develop scatter plots for nodes under their control including lower voltage levels as well. Taking actions as per scatter plots could significantly improve voltage profile in the grid especially in coming winter months. All states agreed for the same. 23. MVAR response by Generators Generator reactive absorption response was discussed in previous OCC meetings where it was highlighted that for most of the generators, either the telemetry of MVAr is not correct or generators are not absorbing MVAr as per their capability curve. Voltage v/s MVAR plots of generators for to are attached as Annexure-23. It could be observed that MVAR data of Dadri is incorrect (sign reversal). NRLDC representative stated that the issue is with RTU installed at Dadri end. NTPC representative stated that same problem was seen last year and was resolved & they would look into this matter again. NRLDC representative added that MVAR performance of generators such as Singrauli, Unchahar, ISTPP Jhajjar, gas stations at Anta, Auraiya & Dadri, Kawai, CLP Jhajjar, Lalitpur and Anpara TPS could improve further and they shall absorb more MVARs especially during high voltages in the grid. NRLDC asked Punjab to more machines at bar such as Ropar, Lehra Mohabbat etc. so that they can absorb more MVAR, thus reducing high voltages in that area. It was further added that BBMB should restrict its generation in night off peak hours so that high voltages in the grid can be reduced. Telemetry issues of Rajpura, Talwandi Saboo, Suratgarh units shall be corrected as soon as possible. OCC agreed that all concerned shall take the corrective action to ensure correct telemetry and MVAr absorption as per machine capability. 24. Low frequency in grid NRLDC representative stated that for past many days considerably poor frequency profile was observed. It was clear from the graphs shown in the meeting that Haryana, Rajasthan and Uttarakhand were overdrawing from the grid (deviation from schedule) and at the same time considerably low frequency was observed. 35

36 Frequency profile for past days is shown below. Frequency remained below the band limit of 49.9Hz for 44.51% of time & 45.63% on 6 th & 7 th Nov respectively and average frequency remained below 50.0Hz for most days as shown above. It could be inferred from the data that frequency remained much more on the lower side of IEGC band ( Hz) for last few days. Over drawl by some of the states & under generation by some of ISGS was one of the reasons for this poor frequency profile. 36

37 Deviation from schedule of all NR states for last 30 days is attached as Annexure-24: In the meeting NRLDC representative highlighted that most of the states are deviating from their schedule. All constituents were requested to take remedial measures to arrest such large and almost continued deviation from the schedule. It was further highlighted by NRLDC representative that Rajasthan is reducing its load abruptly by ~1000MW at 04:00hrs mark and increasing load by ~1000MW at 06:00hrs which leads to excursions in grid frequency as well. He further added that all states shall try to increase/decrease load gradually especially at hourly boundary marks so as to avoid frequency excursions in the grid. All states agreed that they would take necessary steps in this regard. 25. Reduction in DC due to coal shortage NRLDC representative highlighted that by means of several written/verbal communications it has been conveyed to the utilities that they shall maintain adequate reserves to meet the demand safely. Specially, considering the poor frequency profile witnessed during last few days, arrangements need to be made to keep sufficient fuel reserves. However, some generators reduced their DC due to coal shortage. Thermal plants such as Dadri Thermal-1, Dadri Thermal-2 and IGSTPP Jhajjar have reduced their DC due to coal shortage. He further added that on this reduction in DC by ISTPP Jhajjar was done in evening hours when high demand is observed. 37

38 Representative from ISTPP Jhajjar stated that this was a single incident when such situation happened and they would take actions so that such incidents do not occur in future. Apart from above generating stations, Kawai Unit #1 & 2 in Rajasthan, CLP Jhajjar Unit#1 in Haryana, Rajpura TPS Unit#2 in Punjab are out due to coal shortage. MS NRPC stressed that it has already been decided that generators shall take adequate measures to keep sufficient reserves and should inform atleast one day before if situation of coal shortage is foreseen. OCC agreed that most generators are following these instructions; it was decided that all generators should strictly adhere to the above instructions. 38

39 26. Offline Studies system data NRLDC representative stated that network data shall be given for each quarter separately for PoC transmission charges and losses calculations as well as on monthly basis for TTC/ATC calculations in line with CERC regulations and orders. However, same is not being followed meticulously. Main reason for the same is inactive off line study groups at State level. Even OCC has agreed that each SLDC would submit on monthly basis the list of new transmission element being commissioned in each state similar to being done by RLDC for ISTS. To increase participation from states in this area, a workshop on offline studies using PSSE software & Transfer capability assessment was organised by NRLDC on 30 th October Workshop had 36 participants (including those connected through Video Conferencing) from NRPC, different SLDCs, STUs, NLDC and NRLDC. In the workshop, areas such as PSSE basics and modeling techniques, assessment of Network Transfer Capability (Case Studies for Punjab & Delhi), PV, QV analysis and overview of dynamic data were covered to increase participation from states in system studies. OCC appreciated the efforts put in by NRLDC and agreed that states should show more involvement in the area of system studies only then simulation studies would yield better results and would also help to assess/resolve intra-state constraints. 27. Reliability Issues: Rajasthan: N-1 non-compliance at 400/220kV Jodhpur and Merta S/s needs to be monitored especially in upcoming winter season when high demand is observed in Rajasthan control area. Simulation studies may be carried out to identify alternate paths for supplying power at underlying n/w of Jodhpur & Merta to make ICT loading N-1 compliant before high demand in winter is experienced. Uttar Pradesh: ATC of UP control area has increased to 8300MW from 15th October onwards. N-1 non-compliance has been observed at 400/220kV ICTs of Azamgarh, Moradabad, etc. Evacuation issue of Lalitpur/Parichha & Bara TPS under N-1-1 contingencies is still present. Evacuation issues of Anpara-D/Anpara-C under N-1 contingency of 765kV AnparaC-Unnao. Gr. Noida-Nawada was opened on few occasions to control the loading of Dadri-Gr. Noida. From the past few days, loading of 400kV Dadri-Gr. Noida has reduced and need for opening of 400kV Gr. Noida-Nawada was not seen. UP representative informed that 400kV Gr. Noida- Gr. Noida #2 is also expected to be commissioned shortly which would further improve the situation. 39

40 28. Frequent forced outages of transmission elements NRLDC representative stated that the following transmission elements were under frequent forced outages during the month of Oct 17: 40

41 S. No. Element Name No. of forced outages Utility kv Mathura 400(UP)-Muradnagar New(UP) 1 12 UPPTCL kv HVDC Champa(WR) - Kurukshetra(NR) line PGCIL 3 400/220 kv Banda(400) 315 MVA ICT 1 5 UPPTCL kv Bikaner-Merta 5 RRVPNL kv HVDC Champa(WR) - Kurukshetra(NR) line -1 5 PGCIL kv Aligarh - Muradnagar UPPTCL kv HVDC Balia-Bhiwadi Pole 1 3 PGCIL kv Koldam(NTPC)-Ludhiana(PG) -2 3 PKTCL kv Mainpuri 765(UP)-Orai 400(UP) 1 3 UPPTCL The complete details were attached at Annexure-28 of the 141th OCC Agenda. It could be seen that issues like no auto-reclosing, mal-operations, HVDC protection operation, delayed clearance of fault are observed in most of the cases. The frequent outages of such elements affect the reliability and security of the grid. POWERGRID representative presented the different reason of tripping of HVDC Champa-Kurukshetra and remedial action taken. Rajasthan representative informed in 140 th OCC meeting that frequent tripping of 400kV Bikaner-Merta line was due to issue of Alstom make PLCC channel at Merta end and same has been kept out of service. However it was brought out that the tripping of 400kV Bikaner-Merta was also observed this time. Non-auto-reclosing of 400kV Aligarh-Muradnagar ckt-1 & 400kV Mathura- Muradnagar N is still pending from UPPTCL end. It was discussed and deliberated in 135 th, 136 th, 137 th, 138 th, 139 th, 140 th OCC & 141th meeting, that the frequent outages of such elements affect the reliability and security of the grid. OCC advised concerned Utilities to look into such frequent outages and take the remedial measures in this respect to avoid tripping in future. OCC asked all concerned utilities to submit the remedial action taken report for frequent tripping of aforesaid elements. It was once again requested to all the concerned utilities to submit the details within 15days. 29. Multiple element tripping during 3-phase fault at 400kV Panki(UP) station: NRLDC representative stated that at 07:01hrs of 2 nd Nov 2017 severe 3-phase bus fault occurred at 400kV Panki (UP) substation, wherein fault clearing time measured through Phasor Measurement Unit (PMU) data was more than 400ms with voltage drop as high as 41

42 0.9 PU at nearby Kanpur bus. The following PMU plot of Kanpur voltage is showing as dead 3-phase fault in the system. Such delayed clearance of 3-phase fault is a matter of serious concern for the secure operation of the grid. During this event, apart from tripping of entire 400kV Panki (UP) substation (400kV Panki-Unnao ckt, 400kV Kanpur-Panki ckt-1 & 2, 400kV Panki- Aligarh, 400kV Panki-Rewa Road), three units (210MW) of Unchahar as well as SVC at Kanpur also tripped. Unchahar Unit-3 & 5 tripped on drum level low and Unit-4 tripped on PA fan tripping. 400kV Panki (UP) substation has DMT bus scheme in which the tripping of both the buses is doubtful. The HVDC terminal at Agra was also severely impacted. With this tripping there was sudden rise in the voltage at Agra station, the voltage on 400 kv side which was around 428 kv prior to incident rose to 437 kv. Filter-2 & Filter-5 at Agra HVDC station came in service during the incident and the extra 500 MVAR caused sudden rise in voltage. There was sudden rise in voltage after fault clearing which indicates the switching in of filter banks at the Agra station. With the rise in voltage to 440 kv at Agra bus voltage, the 400 kv Agra-Jaipur South-D/c got tripped. 400 kv Agra-Bhiwadi line was also manually opened to control the system voltage. With the corresponding filter bank switching there was change in power order, the HVDC BNC- Agra-APD power order suddenly ramped down and stayed there for some 4 minutes and later ramped up to 800 MW. With the outage of 400 kv lines from Agra station, the power flow on 765 kv Gwalior- Agra D/c kept reducing with corresponding shift of power to 765 kv Gwalior-Phagi-D/c and ultimately on Phagi ICT. The flow on only 765/400 kv ICT-2 at Phagi went up to 1450 MW which was a serious threat to the system. To relieve the high voltages in the 42

43 system HVDC Champa-Kurukshetra Bipole was ramped down from 1000 MW to 500 MW and HVDC Mundra-Mahendergarh Bipole was ramped down from 800MW to 400 MW within 5 minutes. Following were the points of concern: Operation of both bus bar protections during fault in 400kV Panki-Unnao ckt at Panki end. Non-tripping of 400kV Kanpur-Panki ckt-1 from Panki end during bus bar protection operation. Tripping of Unchahar units during fault in the system. Tripping of Kanpur SVC and its reason. With the HVDC embedded in the system, any kind of fault near HVDC terminals can have corresponding change in power order/outage of HVDC. There is urgent need of settings review of HVDC controls to avoid any cascaded tripping. Phagi ICT remains heavily loaded and early revival of second ICT at Phagi will help in reliable system operation. Protection coordination at station near HVDC terminals may be reviewed and defect if any may be rectified. HVDC ramp down/ramp up instructions to be implemented in lowest possible time by stations in case such instructions are given by RLDC/NLDC. UPPTCL representative informed that jack bus has fallen on both the buses and created bus fault at 400kV Panki (UP). Reason of non- tripping of 400kV Kanpur- Panki ckt-1 and delayed operation of bus bar protection needs to be looked into. NRLDC representative informed that it s a near miss event for the grid as it impacted the HVDC power order, tripping of units at Unchahar and Kanpur SVC. It may have impacted more if persisted for longer duration. Delayed clearance of three phase fault is very dangerous to the system and its impact was already seen in the peak summer when induction motor stalled due to delayed clearance (1000ms) of three phase fault at Samaypur BBMB. Action Points: UPPTCL shall organize the internal Audit of 400/220kV Panki (UP) and submit the audit and action taken report within 15days. NTPC shall also thoroughly check the reason of tripping of three units at Unchahar station and submit the action taken report within 15days. POWERGRID shall check the reason of tripping of Kanpur SVC and automatic power order reduction at Agra-BNC and take corrective action. POWERGRID shall also submit the action taken report to RPC/ RLDC within 15days. MS, NRPC suggested to make an internal committee consisting of one member each from POWERGRID, UPPTCL, Delhi, NRPC and NRLDC to audit the 400/220kV Panki (UP) substation to identify the exact reason and remedial action taken by the constituents. 43

44 30. Multiple element tripping during delayed clearance (16second) of 3-phase fault at 400kV Karcham substation: NRLDC representative stated that at 15:30hrs, 400kV Jhakri-Karcham ckt-1 was kept under planned outage for breaker auto reclosing testing at Karcham end. At 16:00hrs of 04th Nov 2017 during testing activities severe 3-phase bus fault occurred. It has been seen from the PMU plot that it was a three phase fault which got cleared in almost 16 seconds of time. The PMU plot is as below: After 1000ms of fault occurrence, 400kV Jhakri-Karcham ckt-2 tripped in Z-3 distance protection. 400kV Karcham-Abdullapur both circuit tripped from Karcham end only. 400kV Karcham-Baspa circuit-2 tripped from Baspa end. 400kV Karcham running one unit tripped on 100% stator earth fault protection within 800ms. 400kV Rampur HEP units tripped due to under excitation. We were fortunate due to incident occurring at the far end of grid. Had the location been around centre of the grid, we could have faced major crisis in the grid. 3-phase fault in 400kV Karcham-Jhakri ckt-1 resulted into tripping of following elements: 400kV Karcham-Jhakri ckt-2 400kV Karcham-Abdullapur ckt-1 & 2 400kV Karcham-Baspa ckt-1 & 2 Two units of 400kV Rampur HEP (68.67MW) Two units at 400kV Baspa HEP (100MW) One unit at 400kV Karcham HEP (250MW) 44

45 Following are the points of concern: Maintenance and relay testing practices during planned shutdown. Reason of delayed clearance of fault till 16seconds. Failure of primary and back up protection at Karcham/ Abdullapur substation Tripping of two units at 400kV Rampur HEP during fault not in its zone. Non-operation of Z-2/Z-3 protection at Abdullapur end of 400kV Abdullapur- Karcham ct-1 & 2. Reason of tripping of 400kV Karcham-Abdullapur ckt-1 & 2 from Karcham end. Action Points: POWEGRID shall review the Z-3 setting of 400kV Karcham-Abdullapur ckt- 1 & 2 for fault at remote end of Karcham station. POWERGRID shall also check this setting in other transmission lines. Maintenance and relay testing practices during planned shutdown needs to be adhered. (All NR constituents). SJVNL shall review the reason of tripping two units of Rampur HEP and submit the action taken report within 15days of the incident. JSW shall submit the detailed report and action taken report to RPC/ RLDC within 15days. MS, NRPC expressed concern about delayed clearance of fault of 16second, failure of main and back up protection in faulted line and adjacent line (400kV Karcham- Abdullapur ckts). NRPC also suggested all the constituents to kindly take care about such incident. 31. Multiple element tripping in Punjab control area due to foggy weather season: During 6-8 th Nov 2017, many 400kV above transmission elements tripped in Punjab control area due to foggy weather season. Almost entire 400 kv ring of Punjab was out, it led to generation loss of Talwandi Saboo TPS. All three running units of Talwandi Saboo TPS tripped/ stopped due to evacuation constraints. It resulted into total thermal generation loss 1200MW despite of coal shortage in the NR. Such large number of grid element tripping is detrimental for grid security and reliability. Following are the list of 400kV and above transmission elements tripped in Punjab during fog: 45

46 Tripping during Nov 2017 (8th Nov till 10:00AM) S. No Element Name Type Voltage Level Owner Outage Revival Expected Date of date time date time Revival Reason / Remarks 1 Makhu -Mukatsar - 2 Line 400 kv PSTCL 6/11/17 1:42 7/11/17 16:54 - Phase to earth fault Y Phase 15.2 km from Makhu 2 Mukatsar - Talwandi Sabo - 1 Line 400 kv PSTCL 6/11/17 3:23 6/11/17 20:19 - Phase to earth fault R Phase 22km from Muktasar 3 Makhu -Mukatsar - 1 Line 400 kv PSTCL 6/11/17 4:11 * * NA Phase to earth fault B Phase 47 km from Makhu 4 Mukatsar - Talwandi Sabo - 2 Line 400 kv PSTCL 6/11/17 4:40 7/11/17 12:49 - Phase to earth fault Y Phase 14 km from Muktasar 5 Amritsar(PG)- Makhu(PSEB) -1 Line 400 kv PSTCL 6/11/17 23:04 * * NA Phase to earth fault Y-N. Tripped on suspected fog 6 Amritsar(PG)- Makhu(PSEB) -2 Line 400 kv PSTCL 7/11/17 1:50 * * NA Phase to earth fault B-Ph. Tripped on suspected fog 7 Dhuri(400kv) - Talwandi Sabo 1 Line 400 kv PSTCL 7/11/17 1:54 7/11/17 15:21 - Phase to earth fault Tripped on suspected fog 8 Dhuri(400kv) - Talwandi Sabo 2 Line 400 kv PSTCL 7/11/17 1:54 7/11/17 12:49 - Phase to earth fault Tripped on suspected fog 9 Nakodar - Talwandi Sabo-1 Line 400 kv PSTCL 7/11/17 2:57 7/11/17 19:20 - Phase to earth fault Tripped on suspected fog Nakodar - Rajpura (TH) - 1 Moga(PG) - Talwandi Sabo(PSEB) Nakodar - Rajpura (TH) - 1 Line 400 kv PSTCL 7/11/17 3:57 7/11/17 11:22 - Phase to earth fault. Line 400 kv PSTCL 7/11/17 5:25 * * NA Phase to earth fault. Line 400 kv PSTCL 8/11/17 1:47 * * NA Details of tripping awaited. 13 Rajpura (400kV) 500 MVA ICT 4 ICT 400/220 kv PSTCL 8/11/17 2:25 8/11/17 4:25 - Tripped on earth fault 14 Dhuri (400kV)- Rajpura (400kV)-2 Line 400 kv PSTCL 8/11/17 3:04 * * NA Details of tripping awaited 15 Nakodar - Talwandi Sabo-1 Line 400 kv PSTCL 8/11/17 6:02 * * NA Distance protection operated R N fault 16 Dhuri(400kv) - Talwandi Sabo 2 Line 400 kv PSTCL 8/11/17 6:26 * * NA Distance protection operated Details awaited Last year also from 30 th Nov 2016 onwards large number of lines tripped in Punjab area which had led to outage of entire Talwandi Saboo TPS and Rajpura TPS. The preparedness for the winter season has already been deliberated from 138 th OCC onwards. The Indian Meteorological Department (IMD) has also started predicting fog since last few days. A special meeting was also planned by NRPC on 14th Nov 2017 for 46

47 updated information on insulator replacement and cleaning. The Indian Meteorological Department (IMD) has started predicting fog since last few days. All the utilities also need to be vigilant for secure grid operation of NR. Punjab representative informed that contract for insulator cleaning has been awarded and cleaning was scheduled from 30th Nov 2017 onward however this year fog came before the expectation. All the 400kV lines in Punjab Ring have recently built and all these lines have conventional porcelain insulator. NRLDC informed that frequent outage of generation due to transmission constraint also impact the grid operation specially during scarcity of generation in the grid due to coal shortage. Suggestive measures for foggy/ winter season: Insulator cleaning/ replacement Switching-off the capacitors Put all the line reactors in the service Distributed generation at lower voltage level to control the voltage Open lightly loaded long 400kV lines if needed Use of line reactors as bus reactor after opening of lines Additional man-power deputation in control rooms and important substations of Northern Region. NRLDC representative also suggested considering early onset of fog in the contract while placing the order for insulator cleaning. NRPC members agreed about the benefit of polymer insulator over conventional/ anti fog insulator and also suggested to the utilities to identify the transmission lines for insulator replacement specially those lines, frequently tripped during last/this year foggy season. All the utilities also need to be vigilant for secure grid operation of NR. 32. Multiple element tripping events in Northern region in the month of Oct- 2017: A total of 10 grid events occurred in the month of Oct Out of these, 5 no. of events were of GD-1 category. The preliminary report of all the events have been issued from NRLDC. A list of all these events along with the status of details received were attached at Annexure-32 of the Agenda. It could be seen that a fault clearance of the order of 1000ms {23 rd Oct 2017: Tripping of HVDC Champa-Kurukshetra Pole-1 & 2} has been observed which is very much exceeding the standard value of 100ms. The summary of the attached table is as below: 47

48 Preliminary Report or DR/EL received within 24hrs: 2 events DR/EL received after 24hrs: 4 events Fault clearance time (based on PMU data) more than CEA grid standard: 4 events Line tripping without any fault (based on PMU data): 3 events Further, despite persistent discussions/follow-up in various OCC/PCC meetings, the compliance of the regulations is still much below to the desired level. Consolidated status plots are as below: 1, 10% Bus bar protection 1, 10% 2, 20% 1, 10% 1, 10% 1, 10% 2, 20% 1, 10% Commutation failure Over Voltage Wrong Switching Operation Non operation of Bus Bar Protection Mal operation of Bus BarProtection Protection Co-ordination Protection over reach 48

49 4 3 2 # Preliminary within 24hrs # Preliminary report after 24hrs #Preliminary report Not Received #DR/EL within 24hrs # DR/EL after 24hrs # DR/EL Not Received # Detailed report Received # Detailed report Not Received 1 0 Adani BBMB Haryana Powergrid Rajasthan Tehri UP Delhi In the OCC meeting all the members were requested to take expeditious actions to avoid such tripping in future. Moreover, utilities were requested to impress upon all concerned for providing the Preliminary Report, DR/EL & Detailed Report of the events in line with the regulations. NRLDC representative stated that as the issue is being reported regularly to the CERC all concerned may look into the issue seriously. All the concerned utilities were emphasized to ensure that the Preliminary Report, DR/EL & Detailed Report of the events are provided by the concerned, in time. Representative of NRPC stated that incident which occurred due to human error was really unfortunate. He requested all NR utilities to have proper training for maintenance team to avoid such kind of tripping s in future. Protection setting also needs to be reviewed by all the involved agency. 33. Details of tripping of Inter-Regional lines from Northern Region for OCT 17: A total of 14 inter-regional lines tripping occurred in the month of Oct 17.List was attached at Annexure-33 of the Agenda. The status of receipt of preliminary reports, DR/EL within 24hrs of the event and fault clearing time as per PMU data has also been mentioned in the table. The non-receipt of DR/EL & preliminary report within 24hrs of the event is in violation of various regulations. As per regulations, all the utilities shall furnish the DR/EL, flag details & preliminary report to RLDC/RPC within 24hrs of the event. They shall also furnish the detailed investigation report within 7 days of the event if fault clearance time is higher than mandated by CEA (Grid Standard) Regulations. It could be observed from attached table that not all information regarding the tripping is received from the utilities. The summary of the attached table is as below: Preliminary Report or DR/EL received within 24hrs: 3 events DR/EL received after 24hrs: 0 events Line tripping without any fault (based on PMU data): 4 events 49

50 Consolidated details plot is as below: In the OCC meeting all the members were requested to note and advise the concerned for taking corrective action to avoid such tripping as well as timely submission of the information. Power Grid was requested to look into the issue specifically as most of the lines were related to Power Grid NR Frequency response characteristic: Two FRC based event has occurred since last OCC meeting. Description of the events is as given below: Table: S. No. Event Date Time Event Description Starting Frequency End Frequency (in hrs) (in Hz) (in Hz) Δf Oct-17 19:33hrs Due to loss of evacuation lines, Unit-I & II at TPCIL(660 MW each) in southern region got tripped Oct-17 21:37hrs 400kV TPCIL-Nellore PS ckt-1 tripped due to failure of Station transformer LA, Ckt-2 was under maintenance; Due to Loss of evacuation path generation loss of 1260 MW occurred The Hon ble CERC approved procedure has already been shared with all concerned during previous OCC meetings. FRC observed for each state control area for the events is tabulated below: 50

51 State Name FRC for 25-OCT-17 Teesta event FRC for 30-OCT-17 Teesta event FRC calculation for Apr-2017 onward Average Median PUNJAB 32% 54% 23.78% 20.34% UTTAR PRADESH 32% 13% 31.73% 16.48% UTTARAKHAND -102% 19% 5.71% 14.41% HARYANA 13% 21% 19.36% 14.21% DELHI 2% -31% 25.86% 13.10% RAJASTHAN -1% 7% 14.45% 4.57% CHANDIGARH 49% 89% 11.09% 0.91% JAMMU & KASHMIR -48% -7% -1.22% -0.03% HIMACHAL PRADESH 2% 19% -0.45% -0.14% NR 9% 11% 13.70% 13.67% In the above table, Average and Median value of FRC calculation of total 15 events (FY ) is calculated. FRC calculation of all ISGS station for the events since last OCC meeting along with median and average value of total 15events is tabulated. As under : State Name FRC for 25-OCT- 17 Teesta event FRC for 30-OCT-17 Teesta event FRC calculation for Apr-2017 onward Average Median Dadri-1 108% 72% 48% 49% Dadri -2* 54.39% 85.65% 27% 30% Jhajjar 32% NA 29% Ropar NA No generation 29% 22% Rihand-1 35% 16% 25% 20% Sh. Cement 15% -13% 7% 14% Rihand-2 10% -2% 4% 8% Obra 7.84% 4.08% 4% 8% ROSA -16% 17% 8% 7% Suratgarh 25.30% 30.23% 5% 6% RAPS-B 11% -3% 5% 6% Badarpur NA NA 3% 3% 51

52 RAPS-C 10.57% 12.64% 3% 2% Tanda -1.64% 14.99% 3% 2% Anpara 2% -2% 0% 2% CLP Jhajjar -4% -14% 2% 1% NAPS 0% NA 6% 1% Anta -3% NA 0% 0% Panipat 14% No generation 1% 0% Singrauli 0% 2% -4% 0% Dadri-Gas 0 0-7% 0% Unchahar 0 0 0% 0% Auraiya NA NA 0% 0% Khedar -4% No generation -1% 0% Anpara C 0% -26% 8% 0% Paricha 0 0-1% 0% Rajwest -0.61% -0.16% 0% 0% KTPS 3.91% -0.54% -5% -1% Rihand-3-7% -22% -4% -1% Faridabad -4% -2% -8% -3% Yamuna Nagar* NA No generation NA NA Chabra NA No generation NA NA State Name FRC for 25- OCT-17 Teesta event FRC for 30- OCT-17 Teesta event FRC calculation for Apr-2017 onward Average Median Karcham 20.63% NA 62.15% 39.81% Wangtoo* Dhauliganga 0.00% 26.85% 48.96% 26.85% Koldam 32.96% % 11.84% 17.30% Jhakri 29.25% 24.96% 20.05% 17.04% Chamera % No generation 17.87% 15.06% Chamera % 0.00% 25.49% 12.53% Parbati-3* 0.00% No generation 6.83% 9.88% Dulhasti 4.89% 18.56% 14.24% 4.06% Bairasiul NA No generation 2.94% 2.23% Salal NA NA 1.62% 1.48% Sainj 2.76% 0.00% 1.38% 1.38% Uri % NA 0.77% 1.05% 52

53 Dehar -2.65% 1.00% -4.99% 0.52% Chamera % % 0.48% 0.48% Tehri 52.19% 10.53% 17.23% 0.39% Bhakra 0.04% 0.18% 1.03% 0.29% Tanakpur 0.00% -4.80% 4.42% 0.00% Uri % 0.00% 14.62% 0.00% Sewa-II NA No generation 10.98% 0.00% Rampur 25.57% 0.00% 11.62% 0.00% Koteshwar NA % 1.98% 0.00% Budhil* NA NA 13.93% 0.00% Vishnu Prayag* NA NA 0.67% 0.00% AD Hydro 0.00% 0.00% 0.00% 0.00% Pong -5.20% 2.13% -3.09% -2.22% Malana-2* NA No generation NA NA In line with the decisions taken during various OCC meetings, the time and date of the FRC events were ed to respective utilities. All utilities were requested to submit the FRC of their control areas and reason of poor response. ISGS generators were also requested to submit the FRC response details along with reason of poor response. It was highlighted that the Governor Action response is to be closely monitored and improved upon. Details were received only from Punjab, Rajasthan, NHPC, THDC and Kawai, summarize details are as below: 53

54 In 138 th, 139 th OCC meeting following action points were decided: All the ISGSs stations shall calculate the unit wise FRC and present the graph of FRC response from next OCC meeting onwards. SLDCs shall also calculate unit wise FRC and control area response and submit it to RPC/RLDC. 54

55 Reason of lower response shall be mentioned in the report submitted by all the concerned utilities. Status of governor availability along with droop setting (in service or not) to be submitted by all the ISGS generators and states utility by 139 th OCC meeting. SCADA mapping of RGMO/FGMO signal by the respective utilities on their own expense. OCC once again requested all the members to kindly take action on aforesaid points within 10days. 35. EHV line tripping due to fog during winter: As discussed in 139 th & 140 th OCC meeting, In order to avoid tripping of EHV line during foggy (Smog) weather in winter, preventive actions like cleaning/washing of insulator, replacement to insulators with polymer one etc. have been recommended and being done. In order to have proper information about the lines wherein such actions have been taken, it had been repeatedly agreed in OCC/TCC meetings, to update line wise data for insulator replacement and cleaning. The lines details as well as format had been shared last year during winter but detail in desired format is yet to be received from the utilities. The details of the format stands issued in the Minutes of the meeting dated It was also highlighted that multiple tripping took place at Punjab due to fog from to wherein entire generation of Talwandi Saboo went under outage. NRPC informed that number of fog related tripping reduced after replacement of conventional insulator with the Polymer insulator. Earlier tripping numbers used to trippings in a single night has been reduced to lines now days. NRPC members agreed about the benefit of polymer insulator over conventional/ anti fog insulator and also suggested to the utilities to identify the transmission lines for insulator replacement specially those lines, frequently tripped during last/this year foggy season. Utilities were asked to submit the details before 30 th Nov 2017 as agreed in special meeting of insulator replacement/ cleaning. Revised format agreed in the meeting is also tabulated above. All the utilities kindly also share the line wise details attached as Annexure-23C of 139th OCC Agenda & also attached as Annexure I with the MOM issued vide letter of even number dated Revision of document for Reactive Power Management for Northern Region: Reactive Power Management document for Northern region is due for revision. The last updated document link is as below: 55

56 Document is password protected and password was already informed to all the NR constituents through letter dated 30 th Dec For revision in the document, following information needs to be updated in desired format: List of 765kV, 400kVand 220kV transmission line List of Line reactors List of Bus Reactors List of FSC/TCSC& SVC List of tertiary reactors on 33kV side of 400/ 220/ 33 kv ICT s. List of shunt capacitors OLTC details of ICT s Generator transformer tap details List of Over Voltage setting of 400kV & above transmission line Generator reactive power capability curve for Generating stations Filters details of HVDC Agra-BNC & HVDC Champa-Kurukshetra and different mode of operation. Formats were attached as Annexure-36 of 139th OCC Agenda NRLDC representative informed that despite of regular Agenda in last three OCC meeting. Status of details submission is tabulated below: 56

57 Reactive Power Document Data Received from Data Not received from Haryana Malana-II SJVN Rosa-Reliance Adani HP NHPC UP J&K NPCIL Delhi APCPL NTPC JAYPEE Punjab POWERLINK Railway PKTCL Haryana Shree Cement Uttarakhand THDC BBMB Karcham (JSW) Chandigarh Malana-I Rajasthan AD Hydro POWERGRID Others Greenko Budhil OCC requested all the constituents to provide the feedback, suggestion and updated information by 20th November Revision of document for System Restoration Procedure (SRP) for Northern Region: System restoration procedure for Northern region is due for revision. The last updated document link has already been shared with the constituents. Constituents are requested to go through the document and provide any modification/addition in respect of their system. SLDC/Generating utilities are requested to kindly update and share the restoration procedure in respect of their state/generating station. NRLDC representative informed that despite of regular Agenda in last three OCC meeting. Status of details submission is tabulated below: 57

58 System Restoration Procedure Data Received from Data Not received from Haryana Delhi SJVN NHPC Rajasthan HP Punjab Rosa (Reliance) J&K Greenko Budhil Malana-I NTPC JAYPEE POWERGRID NPCIL Railway POWERLINK UP PKTCL Uttarakhand Shree Cement BBMB THDC Chandigarh Karcham (JSW) APCPL AD Hydro Adani Malana-II Others Last year, OCC advised SLDC/Generating utilities to prepare restoration procedure in respect of their state/generating station. However information is still awaited from most of the constituents. OCC requested all the constituents to provide the feedback, suggestion and updated information by 20th November Mock Black start exercises for year : As per Indian Electricity Grid Code (IEGC) clause 5.8(b) Mock trial runs of the procedure for different sub-systems shall be carried out by the Users/ CTU/ STU at least once every six months under intimation to the RLDC. The summary of the Mock Black start exercises successfully conducted for Oct-2017 given below: S. No. Name of stations Date Remarks 1 Koldam 24-Oct-17 Island collapsed due to tripping of line (400kV Koldam- Ludhiana ckt-2) on over voltage protection, Unit black started with Bus reactor in service which stabilized island and successfully synchronized with Grid at Ludhiana (PG) station 2 SEWA 3-Nov-17 Island collapsed due to limiter restriction on Governor 58

59 response, again Unit-black started and successfully synchronized with Grid at Sewa end. 3 Auraiya GPS Date to be intimated Final dates of mock black start exercise of ISGS hydro stations is tabulated below: Date proposed by NRLDC Date proposed by generating company Name of stations 24-Oct-17 Ok #Koldam 31-Oct-17 3-Nov-17 7-Nov-17 Tentative: Nov-Dec Nov Nov-17 # Nathpa Jhakri & Rampur # Dhauliganga # Salal 10-Nov Nov-17 #Sewa-2 14-Nov Nov-17 Ok Ok # Budhil # Malana-2 21-Nov Nov-17 Parbati-3 24-Nov Nov-17 Chamera-3 30-Nov Nov-17 Uri-I, II HEP, Lower Jhelum HEP, Pampore GT s & Upper Sindh 5-Dec-17 1-Dec-17 Chamera-2 8-Dec-17 1-Dec-17 Chamera-1 20-Dec Dec-17 Bairasiul 4-Jan-18 Ok Koteshwar 9-Jan-18 Ok AD Hydro 16-Jan-18 Ok Karcham Wangtoo 23-Jan-18 Ok Tehri Status Conducted on 24th Oct 2017 Conducted on 3rd Nov 2017 In 140 th OCC meeting Rajasthan informed about tentative dates of mock black start exercise for state generating units. SLDC s may also carryout mock black-start of station in their respective control area & inform the tentative dates to the OCC as well as outcome of these exercises. The proposed Hydro Power Stations to undergo the exercise are as follows: S. NO. Utility Hydro Power Station Installed Capacity(MW) 1 Baglihar 3x150 2 Baglihar stage-2 3x150 3 J&K Lower Jhelum 3x35 4 Upper Sindh 2x11+3x35 5 Sainj 2x50 6 Larji 3x42 7 HP Bhabha 3x40 59

60 8 Malana -I 2x43 9 Baspa 3x Anandpur Sahib 4x33.5 Punjab 11 Ranjit Sagar 4x Rihand 6x50 13 Obra 3x33 UP 14 Vishnuprayag 4x Srinagar (Alaknanda) 4x Gamma Infra 2x76+1x73 17 Shravanti 6x75 18 Ramganga 3x66 19 Chibro 4x60 20 Uttarakhand Khodri 4x30 21 Chilla 4x36 22 Maneri Bhali-I&II 3x30+4x76 23 IP Extn GTs 6x30+3x30 24 Pragati GPS 2x x121.2 Delhi 25 Rithala 3x36 26 Haryana Faridabad GPS 2x x During last winter, SLDCs had been requested to carry out mock drills and share their experiences. However, the information is yet to be received. The information may please be shared by SLDCs and program for this year s mock black start exercises shall also be shared. SLDCs shall submit the reports of black start exercise in their respective control area. SLDCs may also identify further generating stations/unit for black start exercise. The power stations were requested to confirm and inform to all the concerned persons of control centre/ substations to facilitate the exercise. The SLDC were requested to provide the details of mock exercises carried out last season in their respective control areas and submit a scheduled plan to carry out these exercises in current season by 25th November MS, NRPC also requested all the concerned utilities to kindly adhere to the schedule and plan accordingly. Additional agenda by NRLDC 39. Oscillation in the Grid: Event Description: On 9th Nov 2017, at 1835 hrs, system wide oscillations were observed in frequency and voltage of the Indian grid. The oscillations in northern region were most prominent and biggest in amplitude. The oscillations started with tripping of 400 kv Koteshwar(PG)-Meerut-1 from Meerut end. The CB opened from Meerut end and line kept holding from Koteshwar(PG) end. The oscillations started from 18:34:45:720 and ended at 18:35:36:

61 The oscillation was of frequency 0.85 Hz with initially negative damping and later with positive damping with ratio of The dominant mode of 0.85 Hz caused oscillations of 50 MW even in 765 kv Solapur-Raichur D/c power flow. The oscillations started due to tripping of one out of two evacuation lines for Tehri and Koteshwar generation. The tripping of one line led to sudden shifting of load on other line. This heavy loading of 400 kv Koteshwar-Meerut-2 was the cause of hunting of Tehri and Koteshwar units and resulting oscillations PMU plot of the incident: 61

62 62

63 Existing SPS logic: Points discussed during the meeting: Reason of opening/ closing of main breaker of 400kV Meerut-Koteshwar ckt-1 at Meerut end without intimating RLDC. Time for revival of FSC for 400kV Meerut-Koteshwar ckt-2 SPS setting of 1200MW needs to be reviewed Action Points: SPS setting of 1200MW to be changed to 1100MW. Testing during evening peak hours needs to be avoided for mal-operation. FSC of 400kV Meerut-Koteshwar ckt-2 shall be revived as soon as possible. 40. Additional Point: Status of Line Reactor to be used as a bus reactor: To curb the high voltage in the system NRLDC is suggesting following measures: Switch off all the capacitor and switch in all the shunt reactor. Generator shall absorb the reactive power according to its capability curve. Open the 400kV and above lines to control the high voltage. Line reactor of opened line shall be used as a bus reactor Summary of Line Reactor in NR: 63

64 Some of the switchable Line reactors are not being used as Bus reactors after line outage. Few sample cases are as given: NRLDC requested all the NR constituents to kindly put back the line reactor as a bus reactor after opening of line to control the voltage in winter months of low demand. 64

65 41. SPS operation in the month of Oct-2017: To improve the reporting and analysis of SPS related operations, the following was proposed in 138 th OCC meeting: Reporting of SPS details within 3days of SPS operation. Submission of monthly SPS operation details for a month by 5 th date of the following month. A format for monthly submission of information is as below: Format for Monthly SPS operation: S. No. Date Time (in hrs) Event Description SPS logic Planned operation Actual operation Relief occurred (MW) Remarks It is once again discussed in 139 th & 140 th OCC meeting but compliance is still very low from most of the NR utilities. Details of SPS operation for the month of Oct-2017 is still pending from all the utilities except Rajasthan. Rajasthan has submitted the details only for two incidents. List of the SPS operation along with status of the report is tabulated below: S. No 1 Rihand_Dadri Pole-1 tripped 2 Element Name Type Voltage Level Owner Mundra- Mahendergarh Pole-1 Line 500 kv HVDC PGCIL :22 DC line fault Line 500 kv HVDC ATIL :56 Outage Status of SPS Report submission Reason / Antecedent As per planned Date Time Remarks Power Flow SPS operation Punjab Haryana Rajasthan UP Delhi Pole-1 tripped due to problem in Tyristor control system at Mahendragarh end Bipole power order: 1400MW Bipole power order: 2000MW Case-2 operated; Load shedding in C & D load group Case-1 operated; Load shedding in Haryana: 150 MW, Punjab:50 MW, Rajasthan: 50 MW, UP: 50 MW Reported load relief: 95MW against 140MW Reported load relief: 320MW against 150MW Reported load relief: 48MW against 119MW Signal not received -- POWERGRID / Adani Yes In the 140 th OCC meeting, representative of NRLDC appraised that for the above two mentioned SPS operation, report has been received from Rajasthan & Haryana. No other utility has submitted the report of SPS operation. This issue of not reporting the incident was flagged in the meeting as shortage of information cripples the process of analyzing the SPS operation. Further, it was also appraised that as per SCADA data available at NRLDC, it was observed that the required feeders in the SPS operations on 25 th Oct 2017 did not trip leading to load relief of only 25% in the incidents. 65

66 Utilities were informed about the concerned points for the incident of 25 th Oct 2017: Non tripping of 220kV Modipuram (UP) Lower relief on 220kV Samaypur-Palwal ckt-1 & 2 (67%) Non tripping at Gobindgarh and Laltokalan station of Punjab Lower load relief from Rajasthan (40% of desired load relief) Lower overall load relief (25% of desired load relief of 520MW) Utilities were informed about the concerned points for the incident of 29 th Oct 2017: Details received only from ATIL and Haryana More than planned load relief: 320MW against 150MW in Haryana Signal not received at Laltokalan station of Punjab. Tripping details not received from Shamli (UP), Alwar (Raj) Members were requested to rectify the issue at the earliest to minimize such misoperation of the SPS. All the utilities were insisted to submit the report of operation as soon as the incident occurs. Further, it was also informed that monthly report of SPS operation for the previous month needs to be submitted by all the utilities by 5 th of every month. POWERGRID/ Adani was also requested to submit the details of feeders to which the signal has been sent in case of triggering of any SPS. Signal recording in the Event Logger (EL) and Sequence of Event (SoE) recorder at all sub-stations needs to be expedited for existing SPS. 42. Deviation Violation The deviations from the schedule are to be minimized. Some of the violations brought out by the Regulations are given below: Violation of regulation 7 (1) of CERC (Deviation Settlement and related matters) Regulation 2014: (Limit on volume of deviation) Table-1: Period: to O/D: Violation in S. No. State Overdrawl Average No of Blocks per U/D: Violation in day Underdrawl 1 Himachal Pradesh O/D 53 U/D 4 2 Haryana O/D 37 U/D 5 3 Rajasthan O/D 36 U/D 14 4 Uttar Pradesh O/D 31 66

67 5 Punjab 6 Uttarakhand 7 Jammu & Kashmir 8 Chandigarh 9 Delhi U/D 20 O/D 15 U/D 7 O/D 13 U/D 22 O/D 5 U/D 2 O/D 2 U/D 3 O/D 1 U/D 5 Remarks: Violation is considered while Deviation from Schedule of a Utility is 150 MW or 12% of Schedule whichever is lower. Violation of regulation 7 (10) of CERC (Deviation Settlement and related matters) Regulation 2014: (Sustained deviation from schedule in one direction). 67

68 Period: 01-Oct-17 to 22- Oct -17 Total No. of Violations Chandigarh HP Delhi Haryana PDD J&K Uttarakhand Rajasthan Punjab UP It was highlighted that most of the states are deviating from their schedule as a result there are large no. of violations. All constituents were requested to take remedial measures to arrest such large and almost continued deviation from the schedule. ADDITIONAL AGENDA ITEMS AGENDA NO AI A presentation was made by AGM Kurekshetra on the KV 3000MW HVDC Champa- Kurekdsheta WR-NR I/C (CKT-I), the same is annexed at Annexure AI AGENDA NO A2 (Agenda by HVPNL) Targets fixed for Load Relief from operation of df/dt & UFR relays in Haryana- Review thereof. It is submitted that an agenda has been put up by SLDC Punjab regarding the target fixed for load relief from operation of df/dt & UFR relays in Northern Region. The Haryana state, also has same type of loading conditions during two different crop harvesting 68