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

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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: स म : प रच लन समन य उपसवमवत क स स य To: As per list व षय: प रच लन समन य उपसवमवत क 140 ब ठक क क य त Subject: Minutes of 140 th 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 140 ब ठक व 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 140 th 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) अवधश ष अवभय त ( प रच लन) 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 140 th Operation Coordination Sub-Committee (OCC) meeting of NRPC held on & at NRPC New Delhi. 140 th Operation Coordination Sub Committee (OCC) meeting of NRPC was held on & at NRPC, New Delhi. The list of participants is at Annexure A MS NRPC in his opening remark stated the following: a) Fuel shortage was a matter of deep concern for all the utilities. b) He informed that as per the IEGC 4 th amendment RPC has to device a mechanism for working for evaluating actual SHR & APC by scheduling of units at part load from 55% to 85%. In this regard a Committee has been formed by NRPC. The Committee has visited the unit of NTPC & Bawana recently, for reviewing the compensation on, account of SHR & APC deterioration due to part load operation, between 55% to 85%, in case of gas based central generating station & ISGS. He requested the utilities to examine the process adapted by the Committee. He advised POSOCO to ensure scheduling of gas stations to facilitate the testing and requested NTPC to arrange domestic gas to facilitate verification of SHR &AEC in the event of further visits by the Committee. c) MS NRPC expressed concern on complete outage of Muzzafarnagar substation. He expressed concern that the incident had taken place on account of human error. He emphasized the need of the hour, is to regularly train the personnel so that system outage on account of human error can be eliminated. He informed the house that in this direction NRPC has organized the training for OPGW in coordination with Power Grid. He also informed that the State Estimator workshop in the SLDC are being planned starting with Delhi SLDC. d) MS NRPC also requested all utilities to submit the required data for finalizing the LGBR of , at the earliest. 1. Confirmation of Minutes: The minutes of the 139 th OCC meeting held on & at NRPC, New Delhi were issued vide letter of even number dated The sub-committee confirmed the Minutes. 2. Review of Grid operations of last month (September 2017): 2.1 Anticipated vis-à-vis Actual Power Supply Position (Provisional) for September, 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 September, It was observed that in the terms of Energy requirement variation was for Haryana, Punjab & Uttarakhand and in the terms of Peak demand for Haryana, Punjab, and Rajasthan & UP. UP representative intimated that the variation in Peak Demand occurred mainly due to coal shortage.representative of Haryana and Punjab stated that the variation in Peak demand & Energy requirement took place mainly on account of the coal shortage. They stated that the problem was met by changing the supply hours. Rajasthan representative stated that the difference in Peak Demand was due to the weather conditions & the gap in not accounting for the solar generation accurately. Uttarakhand representative 2

3 stated that the difference in Energy requirement was on account of the reduced industrial load, less generation in the State and the weather conditions. MS, NRPC emphasized that there was a need to improve the demand estimation and realistic figures should be given, especially the generation from the renewable energy resources should be taken into account. NRLDC representative stated that coal shortages at thermal stations could result in reduction in availability figures but demand as such should have remained as it is and therefore, there is need to further improve the forecasting. Regarding renewable generation, NRLDC representative stated that NRLDC daily reports has provisions for taking data for different renewable technology based generation but the same is not being received properly from most of the states. As renewable energy based generation is becoming important, the reporting of the same is extremely important otherwise or else demand/requirement figure could have impact on future planning. NRLDC representative also informed that some of the ISGS generating stations reduced their DC during Peak Hours than that in Off-peak hours thereby violating provisions of grid code. He emphasized that this need to be avoided and during fuel shortage conditions, DC need to be declared keeping certain reserve coal margin at the station so that during exigencies, we have better reliability. NTPC representative stated that higher DC during the day was being given as per request of DTL where peaking is required from 13:00 to 15:00 hours. It was stated that DC in peak hours is reduced only when coal stock position deteriorates. SE Operation NRPC suggested that if 2 Days coal stock is left, then DC should be reduced from today itself rather than keeping DC normal till actual stocks fall below for less than one day. Similar methodology should be adopted for gas stations for LF fuel DC. MS stated that a minimum of 5days stock for pit head and 7 days stock for non-pit head station is to be maintained as per CEA guidelines. The Sub-Committee was informed that the provisional Power Supply Position and Notified Power Cuts for the month of September, 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 August, 2017 is placed on NRPC website. Members were requested to furnish the data on regular and time bound manner. 2.3 Frequency Profile: Frequency remained within the IEGC band for78.5 % of the time during September, 2017as compared to 75.1% last year during same month. Utilities were requested to take necessary action to further improve the frequency regime viz. staggering of load at hourly boundaries, primary response from the generators etc. It was also mentioned that from 2014 onward, there is continuous improvement in the % of time frequency remaining within the band. While congratulating all the stakeholders for continuous improvement, NRLDC representative also exhorted all the utilities for further improvement in frequency profile through governor actions as well as better forecasting of load. The maximum and minimum frequency attained was 50.32Hz and Hz. Frequency profile details are enclosed at Annexure 2A. 3

4 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 stations: The updated position, of the long outages, is enclosed at Annexure 2B. These outages were discussed at length and utilities concerned were requested to expedite the restoration of the same. 2.6 Representative of NRLDC made a presentation on grid operation during September, 2017 and highlighted the following:- Peak demand met, average demand met and minimum demand met for the region during September, 2017 was MW, MW and MW respectively. The maximum and minimum frequencies were Hz and Hz respectively.. 10% of the time load was >52000MW and 10% of the time load was < 39500MW Maximum deviation was observed in Haryana, JK, HP, Rajasthan followed by UP during September, Utilities were requested to maintain their drawls as per schedule. Sustained daily overdraw gives clear indication about non proper mechanism being in place in the concerned state. MS, NRPC advised all utilities to remain as per schedule and the deviations shall be only be inadvertent in nature Average consumption of the Region for September, 2017 increased by 2.25% (24.MU per day) of corresponding month in previous year. Consumption in UP increased by 15.82% as compared to same month last year. Average Thermal generation in September 2017 increased by.91% (5.19 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 September, 2017 decreased by 1.86% of corresponding month in previous year. Average nuclear generation in September, 2017 increased by 31.57% (7.03MU/day) of corresponding month in previous year. Average renewable generation in September, 2017 decreased by 3.74 MU/day of corresponding month in previous year. Net Average Inter-Regional import increased by MU/day during September, 2017 as compared to corresponding month in previous year. Net Average Import from WR increased by5.56 MU/Day during September, 2017 as compared to corresponding month in previous year. Net Average Import from ER increased by approx MU/day during September 2017 as compared to corresponding month in previous year. Net Average Import from NER was 12.5 MU/day more during September, Consumption of UP and J&K was and 14.46% higher, while consumption of Punjab, Haryana, HP and Chandigarh was 8.13, 7.83, 5.14 and 8.67 lesser during September, 2017 as compared to September, 2016 Total availability during September, 2017 had increased by MU/day as compared to corresponding month in previous year In the month of September, Ckt Kms 400 kv lines & 6 Ckt Kms 220 KV lines were added in the Northern Grid. Also, it was highlighted that 2200 MVA ICT/GTs were charged in the month of 9/2017. Bus Reactors (638MVAr) were also added in the grid in the current month. 50 MW Unit I & II at Sainj & 500 MW Unit 6 Unchhar were also was added in the generation capacity of the NR region in the month of September CoD of Sainj HEP Unit#1(50 MW, hydro), Unit#2(50MW, hydro) and Unchahar Stage-IV (500 MW, Thermal) were done at , and respectively Total outages during September 2017 were 542 including Planned S/downs (217) and Forced S/downs (Trippings-198+Emergency S/Ds-128). OCC advised all members to 4

5 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. Outages of Generating Units due Coal Shortage(5035) availability as on {Total 5035 MW= CS (710)+SS(4325)MW} Outages of Generating Units due to less demand as on {Total MW= CS (431.5)+SS(880)MW} The difference between data, received from SCADA and SEM in terms of % age was shown as- Punjab (.21), Rajasthan (2.5), Delhi (0.21), Uttarakhand (2.17), UP (1.47), Haryana (.05), J&K (13.12),HP (1.1) & UT Chandigarh (14.93). NRLDC emphasized better telemetry including the digital telemetry for better system operation. He also requested J&K and Chandigarh to look into the reasons for high difference in SCADA and SEM data and take steps for early removing the difference between the two figures. 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. There was record break in term of maximum consumption of UP ( MU) during the month September-2017 The details of the Renewable energy generated in NR is as under: It could be seen that reporting of renewable generation needs to be improved. NRLDC representative requested all SLDCs to check above figures and improve the renewable generation reporting in real-time SCADA as well as in daily energy reports Schedule vs Actual load pattern of UP, Punjab.Uttrakhand, Dehi & J& K was shown for the day of , & (ANNEXURE 2 D). These utilities were overdrawing heavily at low frequency and therefore causing not only low frequency but also incurring higher deviation charges. These utilities as well as 5

6 others also were requested to manage their load/schedule accordingly to avoid such kind of high over drawl (OD) at low frequency. The ramp management issue was also discussed wherein during peak hour unit commitment shall be beforehand so that generation ramp could follow the load ramp during peaking hours. 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. The transmission losses was also discussed in the month of September 2017 V/s September 2016 व

7 The change in variable cost of generation was also highlighted व व - -III - I - II EXT व - व - व व -I व -III व -II व व -II व -I व -I व व व व RLNG) RLNG) RLNG) L) L) व - व -व There was record break in term of maximum consumption of UP ( MU) during the month September-2017 Total Energy approved in STOA decreased as compared to last year September-2016 {September-2017 (2244 MU) and September-2016 (2761 MU)}... (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 The projected demand for Diwali as computed by NRLDC was also discussed by NRLDC representative. He requested all entities to share their projected demand computations also with NRLDC. He also intimated that these details have already been ed by NRLDC to all the utilities. MS NRPC proposed that all utilities should plan the demand keeping the inputs of NRLDC in view 7

8 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 November, 2017 was discussed on The approved/deferred outages of generating units as per deliberations in OCCM stands issued vide letter dated Outage Programme for Transmission Elements. The Outage programme of transmission assets for the month of November 2017 was discussed on The approved/deferred outages of transmission assets as per deliberations in OCCM stands issued vide letter dated Planning of Grid operation 4.1 Anticipated Power Supply Position in Northern Region during November, 2017: Anticipated Power Supply Position in Northern Region during November, 2017 (As per LGBR is enclosed at Annexure 4) was discussed in 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. 5. Monitoring of schemes funded from PSDF(Agenda by NPC) The status of grant sanctioned from PSDF for the schemes in Northern Region was reviewed, as detailed in the ANNEXURE-5 of the Agenda of the 140 th OCC meeting is enclosed with. Also the list of schemes that has been examined and clarification sought from utilities with respect to the schemes is detailed in the Annexure. 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. PSTCL & DTL submitted the information on the desired format. Also the utilities were requested to give clarification sought on the list of schemes that has been examined as detailed in the Annexure. 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, meritindia.in. 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. NRLDC representative highlighted that the data on the Merit Order Portal is being updated regularly by the Central Sector whereas the State sector needs to further improve upon the same. 7. Sub-stations likely to be commissioned in next 6 months. The list of sub stations that stand commissioned or are to be commissioned by 11/2017 was enclosed at Annexure 7 of the Agenda of the 140 th OCC meeting. RVPNL& HVPNL submitted information regarding the downstream network (Annexure 7). RVPNL representative was requested to give the detailed sketches of these networks also. HVPNL 8

9 representative intimated that the work on the transmission lines was hampered on account of the problems faced with the contractors persistently. He further added that now the retendering has been done for getting the work done on the lines. All other concerned states were also requested to submit the details of the downstream network of these POWERGRID substations along with the detailed status/ sketches of these networks. 8. Cleaning and Replacement of porcelain insulators: All utilities were requested to submit the detailed status of replacement of All utilities were requested to submit the detailed status of replacement of Porcelain Insulators in line with the details brought out in Agenda Item 23 of the 139 th OCC meeting. It was suggested that the line wise data for the insulators replaced/ to be replaced be submitted. NRLDC representative stated that the work of cleaning of insulators / replacement of Porcelain Insulators should be completed latest by 15 th December before the onset of fog. It was also proposed that proper planning should be done by the utilities regarding the quantum of cleaning required on each of the line and also the time that would be taken to do the same. It was also informed that the meeting for reviewing the progress of cleaning/ replacement of insulators will be called tentatively in the second week of November 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. 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. All utilities (except DTL) were requested to submit the UFR testing report for the quarter ending September

10 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 OCC meeting: HVPNL representative intimated that the relays 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. PTCUL representative intimated that the order for numeric relays procurement has been placed and the relays will be replaced by 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 members took note of the same. 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 10

11 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 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. SUBSTATION MVAR Implementation by 1 HINDAUN 125 RVPNL Updated Status in 140 th OCC Expected by MANESAR 125 POWERGRID Commissioned on MERTA 125 RVPNL Expected by Study by POWERGRID for reactive compensation at 220 kv level: The proposal for installation of bus reactors at 12 nos at 400 kv and 17 nos at 220 kv sub-stations was discussed in the 29 th meeting of NRPC held on 13 th September After deliberations, NRPC had approved installation of reactors at 400 kv sub-stations of POWERGRID and RVPNL. As regard 220 kv bus reactors, POWERGRID had stated that the requirement would be firmed up in consultation with the States. Subsequently, POWERGRID, vide dated had submitted report of the study. In this report, reactors at 13 locations at 220 kv levels and at 24 locations at 400 kv level had been proposed. The report was discussed in 34 th TCC/38 th NRPC meeting held on 24 th /25 th October, 2016 wherein Delhi had requested to review the system study for their system. POWERGRID agreed for the same. Subject to review of requirement for Delhi, NRPC approved the report. In the 135 th OCC meeting, representative of Delhi informed that the report would be finalized shortly. 35 th TCC/39 th NRPC meeting held on decided that the report of 11

12 the POWERGRID and the study by RVPNL to be referred to the Standing Committee on Power System Planning of NR. OCC advised Power Grid and RVPNL to take action in this regard. 136 th OCC meeting: Representative of DTL informed that as per the second study conducted by POWERGRID the requirement of reactor for DTL has increased significantly which may not be in line with the actual requirement. Therefore, it was informed to OCC that DTL will again be conducting the study determining the requirement of the reactors. 137 th OCC meeting: DTL representative informed that they have planned to install the reactors as per the requirement arrived in their own study which was conducted by CPRI. DTL was requested to submit the plan for the same. Representative of PSTCL & RVPNL informed in the meeting that the minutes of Standing Committee meeting were still awaited. 138 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. Decision of Standing Committee: 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 sub- stations subject to the availability of space (Annexure-9 of agenda 140 th OCC). It was also agreed that these reactors shall be provided by the owner of the substations. 138 th OCC meeting: 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 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 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. 140 th OCC meeting :The representative of RVPNL in the meeting informed that as intimated in the 139 th 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. The representative of DTL was requested to submit the action plan for installation of the proposed reactors. 12

13 In the meeting it was observed that no utility other than DTL and RVPNL has submitted the action plan for the installation of the reactors. Utilities were requested to submit the action plan at the earliest. 10. System Protection Schemes (SPSs) in Northern Region: 10.1 SPS for Interruption of import by NR at 765 kv Agra (from WR). 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. 129 th OCC meeting: POWERGRID stated that the scheme would be commissioned by th OCC had recommended that the cost of implementation of revised SPS for 765 kv Agra-Gwalior lines could be booked in any ongoing project/ work of Northern Region. In the 132 nd OCC meeting representative of POWERGID proposed that provision of AMC of the scheme for 05 years could also be included in the scope of the work for implementation of the revised scheme. Members agreed to the proposal of POWERGIRD. POWERGRID representative informed that they were waiting for NRPC approval in this regard. After detailed deliberation it was decided that keeping in view urgency of the work, POWERGRID should carry out tendering activities for timely implementation of the revised scheme. The recommendation of the OCC would be put up for concurrence of NRPC in next meeting. 39 th meeting of NRPC held on approved the proposal given in the 129 th OCC meeting by POWERGRID for booking the cost of revised SPS including 05 years AMC in some other on-going project/work. 137th OCC meeting: POWERGRID representative informed that the implementation of the scheme may be delayed by few weeks. However, OCC pursued POWERGRID to complete the same within the stipulated time. 138th OCC meeting: In the meeting representative of POWERGRID, informed that bid opening was scheduled to be held on It was further informed that the scheme would be implemented by Power Grid to make a presentation of the scheme in 139 th OCC & also discuss the simulation studies. 139th OCC meeting: In the meeting it was informed that the scheme would be implemented by th OCC meeting: The representative of POWERGRID informed that the technical bid is under evaluation and the LOA would be placed by November 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. 13

14 136 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. 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: POWERGRID informed that the testing was successfully performed and some modifications have been done in the logic. OCC asked POWERGRID to submit the report of the testing and the changed logic to the NRPC sect. 137 th OCC meeting: POWERGRID representative submitted the information regarding the changed logic. It was requested to POWERGRID to submit the same along with the detailed report of the testing done 138 th OCC meeting: It was noted that POWERGRID has submitted the report. However, citing the legibility of the logic in the submitted report, representative of POWERGRID was requested to share simulation studies and detail logic of SPS and to give a presentation of the scheme along with the changed logic in 139 th OCC meeting. 140 th OCC meeting: The Representative of POWERGRID gave a presentation (attached as Annexure-10). Representative of NRLDC stressed the need to look into the changed logic which was implemented 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 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. 34 th TCC/38 th NRPC meeting: UPPTCL informed that LOA would be placed by and scheme would be implemented in next 3 months 14

15 137 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: In the 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 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 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. 15

16 135 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 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 16

17 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 Following are observations of NRLDC mentioned in the letter: 1. The basic scheme of reduction in generation at Lalitpur TPS upon tripping of 765/400 kv ICT s at Fatehabad or tripping of 765 kv Lalitpur-Fatehabad ckts is as per discussions earlier held in the NRPC meetings. 2. However, the SPS considering entire Lalitpur-Parichha complex as suggested earlier in NRPC meetings, seems not to have been on discussion table or it may not have found favor. The same may also be deliberated if not already done. 3. The Condition 4 Loading on any of the 400kV lines emanating from 765/400kV Fatehabad (UP) station exceeds 800MW would lead to backing down of generation at Lalitpur TPS. May please further elaborate that the same would be automatic in place of manual action. 4. It appears that corresponding load shedding in UP state control area, to maintain load generation balance after SPS operation of either tripping or back down of generation at Lalitpur TPS, is yet to be put in the scheme. The scheme may please be modified to take care of this aspect also. 5. The 30 th TCC & 34 th NRPC meeting had approved that all new SPS scheme shall have: Signal recording in the Event Logger (EL) and Sequence of Event (SoE) recorder at all sub-stations including intervening sub-stations and wired for telemetry to SLDC/RLDC. Consideration of minimum load on any feeder which is part of load drop feeder in the scheme. NRLDC representative requested UPPTCL to implement the scheme and if required modify it later on. 17

18 11. 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 data submitted by the utilities CPRI carried out the capacitor study. The report submitted by CPRI for is available on NRPC website ( 135th 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. 139th 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. 18

19 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 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 upto 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. 12. 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 19

20 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 &138 th OCC meeting OCC meetings: The Status was updated by POWERGRID & NRLDC 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 & is placed at Annexure 12. 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 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. 20

21 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. 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 140 th 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 November, UPPTCL: - 02 nos. of ERS have been received. RRVPNL: - Will not be procuring ERS. 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. NIT placed. Supply expected in 3 month. Representative present intimated that the status has not been updated by PTCUL to SLDC. Discussions being held with vendor. Suitability of ERS for critical locations is being explored. Discussions not concluded. Partner states have agreed to provide the ERS as and when required by BBMB. Order has been placed for 2 nos. ERS. 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. 21

22 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 to take up the issue. SE (REMC) is rigorously pursuing with wind generators for ensuring compliance of CEA Regulations and CERC orders in this regard. 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. 15 RGMO/FGMO compliance by generators in the region (Agenda based on letter by CERC) CERC (IEGC) 5th 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. 22

23 UPRVUNL submitted he information.all concerned utilities were again requested to update as per the information asked in 138 th OCC meeting. 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. 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: The 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

24 17. Auto reclose to Non-auto reclose mode in relay setting (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 Oct to 31 st Dec 2017 (currently work in progress by taking NLDC/NRLDC code on daily basis). b. 765kV S/C Greater Noida to Agra line 15 th Nov to 31st Jan c. 400kV S/C Agra- Bassi line (currently work in progress by taking NRLDC code and shall be completed by 15 th Nov 2017). d. 400kV D/C Neemrana-Sikar line ckt-i (currently work in progress by taking NRLDC code shall be completed by Dec 2017). e. 400kV D/C Dadri-Maharanibagh line - 15 th Nov to 31st Jan f. 400kV D/C Hissar-Bhiwadi line - 15 th Dec to 31st Jan g. 400kV D/C Gorakhpur PG-Gorakhpur UP line - 15 th Dec to 31st Jan h. Balance work of 400kV Ballabhgarh PG- Bamnauli DTL line 1 st Nov to 20 th Nov 2017 (10Kms OPGW work pending due to non issuance of PTW by DTL even in live line condition). The Power Grid representative stated that the approval of changing the relay setting from Auto reclose to Non-auto reclose mode is required for human safety as the work of OPGW IS DONE ON LIVE LINE to avoid frequent outages. NRLDC representative further suggested that for Non-auto to auto for lines may be applied for month wise at least and not for three months and so the progress may also be sent to NRPC/ NRLDC etc. A list of lines in which OPGW already completed and list of lines partially completed may also be complied and may please be sent. Power Grid was requested to do the needful. OCC approved the proposal. It was however stated that the operational code will be taken from NLDC as and when required as per procedure. 18. Frequent outages of HVDC Vindhyachal Block-I &II The HVDC Vindhyachal back to back station block I& II is an important inter connection between Western & Northern Region. It enables power flow either ways in case of constraints within Northern or western regions or on the parallel AC ties providing a variation of 1000MW.It has been observed in the recent past that the HVDC Vindhyachal Blocks are frequently tripping on account of DC over current protection operation. In most of the incidents it is seen that the HVDC blocks trip whenever there is a fault in nearby AC system. The list of such tripping in last 6 months is listed at ANNEXURE 18 of the Agenda of the 140 th OCC meeting. In the 140 th OCC meeting Power Grid was requested to look into the matter to determine the root cause of the problem & take remedial measures. Power Grid representative informed that the problem is in Block I as it has completed its life and no support is available. He further stated that the up gradation work under Ad Cap is already under process to improve the Reliability of the system. 24

25 NRLDC representative stated that over current settings on the line were immediate.power Grid representative stated the settings have been done as per OEM recommendations. It was further requested to Power Grid to submit a report on the tripping and also regarding the settings. NTPC representative stated that HVDC Vindhyachal back to back station is very crucial for startup power in case of total black out at Rihand & Singrauli area. Therefore it was stated by him that it is very important that the Rihand Vindhyachal pool is restored at the earliest so that an alternate route for startup power is available. SE, NRPC stated that for reliability purposes, availability of Vindhyachal back to back is very important as the same is being paid for by the utilities. 19. Mock Black start exercise for the year As per Indian Electricity Grid Code (IEGC) clause 5.8 (b) Mock trial runs of the procedure for different sub-station shall be carried out by the users/ctu/stu at least once every six months under intimation to the RLDC. Further, Mock Black- start exercise of power station are therefore needs to be carried out in-order to ensure healthiness of black start facilities. It has been suggested by NRPC that the winter months are off peak hydro period and therefore good time to carry out such exercise. It was requested to carry out mock black start exercise for the year in respect of following proposed hydro power stations of Rajasthan S. No. Utility Hydro / Gas Power Station Installed capacity 1 Rajasthan Mahi-I & II 2x25 + 2x45 2 Rana Pratap Sagar 4x43 3 Jawahar Sagar 3x33 4 Dholpur GPS 3x110 5 Ramgarh GPS 1x x x110(GT) + 1x50 (STG) In the OCC meeting Rajasthan representative intimated that the tentative schedule for plants listed at 1, 2 & 5 is in the period of December to January. Also it was intimated that at stations Listed at 3& 4 the mock black start exercise could not be carried out due to the unavailability of DG set and output supply respectively. NRLDC representative suggested RRVPNL for revival of output supply for Dholpur GPS because Dholpur station plays important role during revival of Rajasthan sub-system. This has also been part of the restoration procedure of the NR. OCC advised Rajasthan to share the report after completion of exercise. Other states shall also prepare the schedule of their generating station and share the report to RPC/ RLDC. UP SLDC stated they will also plan the mock black start exercise of their stations. 25

26 NHPC representative stated as under: During 139th OCC Meeting, the tentative date for carrying out the Mock Black Start exercise at NHPC Power Stations was circulated by NRLDC. The confirmation on the dates proposed by NRLDC for mock black start of NHPC Power Stations have already been submitted to NRLDC vide NHPC letter dated 11/10/2017. NRLDC acknowledged the receipt of above letter and agreed with the dates proposed by NHPC. Final dates of mock black start exercise of ISGS hydro stations is tabulated below: Date proposed by NRLDC 24-Oct-17 Date proposed by generating company Ok 31-Oct-17 Tentative: Nov-Dec Nov-17 7-Nov Nov Nov Nov Nov Nov Nov-17 Ok Ok Name of stations # Koldam # Nathpa Jhakri & Rampur # Dhauliganga # Salal # Sewa-2 NRLDC intimated that a revised date will be intimated as workshop on SRP is on same date # Budhil # Malana-2 21-Nov Nov-17 Parbati-3 24-Nov Nov-17 Chamera-3 30-Nov Nov-17 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 Uri-I, II HEP, Lower Jhelum HEP, Pampore GT s & Upper Sindh Further NRLDC asked about the trial operation of Chamera-2 Power Station in Condenser Mode. NHPC informed that Unit#3 of Chamera-2 Power Station shall be operated in condenser mode in February 2018 after attending the necessary repairing/maintenance works of Unit#3 during forthcoming Capital Maintenance of Unit. NRLDC/NRPC suggested conducting the above trial operation of Unit#3, Chamera-2 Power Station before the winter season so that this facility could be used during winter months. Regarding Synchronous condenser, NRLDC representative also requested THDC, HP, Punjab, Uttrakhand to share update regarding Tehri, Larji and RSD units operation in synchronous condenser mode. 26

27 20. Energy demand projections for preparation of LGBR At the beginning of each financial year, Northern Regional Power Committee (NRPC) brings out Load Generation Balance Report (LGBR), which contains anticipated month-wise power supply position for the year in terms of energy as well as peak power. A meeting of the LGBR sub-committee was held at NRPC Secretariat, New Delhi on in this regard. Demand projections for the states of Delhi, Himachal Pradesh, Rajasthan and Uttar Pradesh were received and discussed in the meeting (Annexure 24 of the Agenda of the 140 th OCC meeting). Other states were requested in the meeting to submit their demand projections by ; otherwise the projections done by NRPC would be treated as final for preparation of LGBR. 21 Reliability issue of Kashmir valley NRLDC representative detailed upon that Kashmir Valley is connected to the rest of grid through 400/220 kv Kishenpur substation with following lines: i. 400 kv Kishenpur-New Wanpoh 2xD/C [However there are only two 400 kv lines between New Wanpoh to Wagoora] ii. 220 kv Kishenpur-Ramban/Mirbazar-Pampore D/C (one circuit from Kishenpur presently being out of service due to tower collapse since 08 th Feb 2017; was revived for a brief period for 14 days in the month of July 2017) Line out on tower collapse NRLDC representative highlighted that load in the valley area has been increasing over the years and therefore reliability concerns have also been increasing. It was highlighted that there have been multiple elements tripping incidents and collapse of valley system during winter months/ high demand period on N-1 contingency in the Kashmir valley power system since past years. Following issues encountered in winter months in Kashmir valley power system were 27

28 stressed in the meeting: i. High loading & N-1 non-compliance of 4x315 MVA ICTs at 400/220 kv Wagoora (main supply point). High MVAr drawl is also reported at Wagoora S/s which results in low voltages. ii. 220 kv lines loading from Wagoora (220 kv Wagoora-Ziankote D/C and 220 kv Wagoora-Pampore D/C) ~ MW(N-1 violation) iii. Low voltages 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 resulting in valley islanding and collapsing. MW/MVAR loading of ICTs at Wagoora and line loadings of 220kV Wagoora-Ziankote D/C & 220kV Wagoora-Pampore D/C for last 30days was shown in the meeting. It could be understood from graph shown that there is High MVAr drawl at Wagoora which results in low voltages High loading of 220kV lines (220kV Wagoora-Ziankote D/C & 220kV Wagoora- Pampore D/C) N-1 non-compliance of ICTs at Wagoora Voltage duration curve for Srinagar & Uri as submitted by NRLDC in Q2 operational feedback were shown. This indicated continuous low voltages observed in the Kashmir valley even in non-winter/comparatively less demand period. 28

29 It was emphasized that System Protection Schemes (SPS) and system strengthening were approved by Central Electricity Authority (CEA) after 06 th January 2012 tripping to improve reliability/saving valley from collapse during such conditions. However, these schemes are yet to be put in place. In the meeting in light of the details highlighted the following action plans were proposed: *220 KV connectivity at New Wanpoh (sub-station & 400/220 KV ICTs ready since 2013) in order to diversify feed points for valley & reduce loading at Wagoora substation *Re -commissioning /Revival of 220 KV Kishenpur-Ramban * Commissioning of SPS as detailed above * Exploring possibility of the commissioning of 400 KV Amargarh-Samba CKTS Reactive power support to improve voltage profile in the valley area.* Downward connectivity of 400/220 KV stations J&K state utility needs to look into the action plan proposed so that no inconvenience is faced by the general public in the winter season. 22 Coal shortage at central & state thermal generating units NRLDC representative stated that as discussed in previous OCC meetings and through various communications by NRLDC it was requested to all generating units to keep sufficient reserves, fuel availability and sufficient machines on bar considering depleting hydro generation & expecting high demand in Northern Region in September due to dry spell of monsoon. However, large no. of units continued to remain out on fuel shortage issues. Unit wise details available at NRLDC regarding present status of outage of machines due 29

30 to coal shortage as on is tabulated below: S. No. Unit Name & No. States Outage since date 1 Lalitpur #1 (660MW) UP Bara #1(660MW) UP Kawai#1 (660MW) Rajasthan Kalisindh#2 (600MW) Rajasthan Chhabra TPS #2 (250MW) Rajasthan Kota TPS#1 &#2 (110MW each) Rajasthan Suratgarh TPS #3 (250MW) Rajasthan Suratgarh TPS #3 (250MW) Rajasthan MGTPS Jhajjar #1 (660MW) Haryana Khedar #2 (60MW) Haryana Rajpura #2(700MW) Punjab IGSTPP Jhajjar #2(500MW) Haryana & Delhi Unchahar #2 (210MW) UP * All details as per data available with NRLDC on It could be observed that Rajasthan state control area is most affected (total 2230MW) due to outage of thermal units on coal shortage. Critical Station Coal Stock report data available at NRLDC of generating units where coal stock is critical as on was attached in agenda for 140 th OCC Meeting and was discussed during the meeting NTPC Representative stated on the issue as under: Regarding recuperating LF supplies at NTPC gas stations, NTPC stated that order for procurement of LF to full tank storage levels were placed in Sep17 but the receipts at Anta and Auraiya are not accelerated due to logistic constraints. In absence of firm commitment for continuous supply, oil companies are not committing deployment of dedicated tanker fleet for these stations. It takes about days for a LF tanker (containing about 20 KL Naphtha) to reach Anta / Auraiya station from the source point (Vizag). In addition, GAIL also imposes flow restriction at Auraiya thereby restricting station s DC declaration and generation capability. RLNG allocations are also curtailed during mid-day by GAIL as per pipe line hydraulics & supply chain constraints at times which triggers midday DC revisions. OCC though appreciating the efforts and planning put in by the NTPC advised all generating stations to maintain buffer stock in order to enhance reliability during shortage conditions. 30

31 NRLDC representative presented Table showing comparison of Plant Availability Factor (PAF) for central sector stations of Sept months for last three years (data taken from NRPC Regional Energy Account)whose PAF was considerably lower in Sep this year for Dadri-II TPS, Jhajjar TPS, Auraiya TPS, Dadri TPS, Rihand-II STPS, Dadri GPP, Anta GPP etc. for the year 2017 as compared to the year September PAFM (%) PAFM difference Generating unit (Capacity in MW) Vs Vs 2016 ANTA GPP (419) AURAIYA GPP (663) DADRI GPP (830) DADRI TPS (840) DADRI-II TPS (980) JHAJJAR (1500) RIHAND-II STPS (1000) * *Rihand Unit-II 500MW capacity was under annual maintenance from (Source: NRPC Regional Energy Account) NTPC representative informed that there is acute coal shortage at Dadri with coal supplies available for only one day. In the meeting all the Utilities stated that actions are being taken to improve PAF of plants. 23 Prolonged outage of transmission elements NRLDC representative highlighted elements under prolonged outage as shown below: S.No Name of Element Owner /220kV 80 MVAR Makhu B/R 1 400/220kV 315 MVA Auraiya ICT 2 400/220kV 50 MVAR Merta B/R 1 400kV Bamnauli- Jhatikara 1 400/220kV 315 MVA Kalisindh ICT FSC (40%) of Fatehpur-I at MainpurI(PG) FSC (40%) of Fatehpur-II at MainpurI(PG) 400kV Bawana-Mundka 1 & 2 PSTCL NTPC RRVPNL DTL RRVPNL PGCIL PGCIL DTL Outage Date & Time & 12: & 04: & 09: & 20: & 15: & 07: & 13: & 09:50 Reason Y-Ph tan delta test results not within limits Oil leakage in transformer dismantling this 50 MVAR Bus Reactor(this reactor shall be shifted to 400kvBhilwara)and replacing /commissioning with new TBEA make 125 MVAR Bus Reactor at Merta Tower collapse Buchholz relay operated B-ph spark gas cable fail B-ph Capacitor unbalance Fire below 400kV tower no. 116, tower damage 31

32 /220kV 500MVA ICT at Bhadla 400kV Dhanonda-Jhajjar CLP-1 & 2 400/220kV 500 MVA Rajpura ICT 3 FSC ( 50% ) of Koteshwar Pool -2 at Meerut (PG) 400/220kV 500 MVA Dhuri ICT 2 RRVPNL HVPNL PSTCL PGCIL PSTCL & 07: & 15: & 07: & 19: & 10:47 Buchholz, PRV & Differential protection operated Tower collapsed Buchholz relay operated / Detail inspection work Fire in Y-ph unit Buchholz relay operated / will replace by new. 400/220kV 500 MVA & 14 PGCIL due to flashover in ICT-II Gas chamber Maharanibagh ICT 2 16:19 Number of days for which outages have been present is depicted as under: In the meeting PSTCL representative intimated that actions for revival of ICT at Rajpura & Dhuri are already in progress and the same are targeted to be revived before onset of winter. Makhu B/R is also expected to be revived by 31 st Oct 17. NTPC representative intimated that the problem of the ICT at Auraiya is being looked into expeditiously and will be revived by DTL representative intimated that Bamnauli Jhatikara I has been revived on DTL representative intimated that the progress of work for revival of Bawana Mundka line was in full swing and is targeted to be completed by

33 The expeditious progress for the revival of Kalisindh ICT was also intimated by RVPNL representative. NRLDC representative also brought out that the Mainpuri-Aligarh line was in outage since5-6 days and the revival of the same needs to be looked into at the earliest. All utilities were requested to make all out efforts to revive the elements that have been in long outage. 24 Delay in bringing machines at Auraiya & Dadri gas stations NRLDC representative stated that as per Format AS3 provided to NRPC by NTPC, the startup time of Auraiya GT & ST from cold start is 23 minutes & 220 minutes respectively & startup time of Dadri GT & ST from cold start is 75 minutes & 270 minutes respectively.. On 11 Sept 2017, NRLDC request to bring machines under reserved shut down at Dadri & Auraiya GPS was conveyed to NTPC by as well as telephonically at 12:37 hrs. But till 18:00hrs only one GT each at Auraiya & Dadri was synchronized. Due to delayed synchronization of machines the purpose of bringing machines was not fulfilled. NTPC representative in the meeting stated Auraiya machine synchronization was done at 16:11 hrs of However, Dadri GT-1 synchronization got delayed because of problem faced in Fuel oil shut off valve status problem during start up. It took some time to trace the problem which was later rectified and unit was started. In module 1, new system has been put in place in place and this was one of the teething problems faced due to the same. Some delay was also caused in coupling the Steam Turbine because diverter damper failed to open initially. NTPC stated that normally units are brought on-bar as per instructions of NRLDC. However, necessary instructions have been issued to all the stations to keep high level of readiness keeping the grid demand in view and the same has been successfully demonstrated in the subsequent, almost daily start- up of machines during the month. NTPC also apprised the house that NTPC has been periodically testing its gas units on full speed no load test on its own cost to ensure readiness of the machines. In another instance highlighted by NRLDC representative, Dadri-Gas plant declared DC of 730MW from The machines were generating MW only as per schedule given to them and other machines were out on low demand. On , at 11:51hrs, Dadri & other gas stations were informed by NRLDC to bring machines from 16:00hrs. However, at 15:53hrs, Dadri informed that due to seal oil problem of ST2, they are required to take ST2 under shutdown. The DC of Dadri-Gas was also reduced w.e.f. 17:00hrs from 725MW to 655MW. 33

34 SE NRPC requested NTPC to submit a detailed report for the incident within a week. NRLDC urged the house to formalize procedure for DC certification to eliminate any ambiguity in Dc certification. All the utilities were requested give their comments on this particular issue as well as on procedure. NTPC representative had stated in 138 th OCC that the start-up time of GT & ST varies in different conditions & it was decided NTPC would submit details regarding different startup times of GT & ST for gas stations. Expert group constituted by MoP with members from CEA, POSOCO, NTPC & GAIL have carried out studies for utilization of gas generation for peaking requirement. In such a case, it would be of utmost importance to beforehand have knowledge of start-up time of various GT & ST for different conditions. NTPC was requested to submit the same. 25 Under generation by ISGS on continuous basis NRLDC representative stated that months of September& October are generally accompanied with high demand period & especially high inter-regional import. In such scenario, undergeneration by NR ISGS results in higher import on inter-regional paths (ATC/TTC violations) & poor frequency profile. Some of these generators are: IGSTPP Jhajjar Unchahar TPS Dadri Gas 34

35 Anta Gas NRLDC representative further highlighted that Dadri & Anta gas stations have been under generating in previous years also and presented deviation plots (MW & MUs) of these stations for past three years as shown below. 35

36 36

37 NTPC representative informed in the meeting that its stations are following schedules and also following provisions of grid code in maintaining generation as per schedule. It was stated that gas stations Actual Generation has been more than 98% of Schedule Generation. The lower generation at times could also be due to non-timely updating of schedules by NRLDC in real time with proper ramp rates that some large deviations are visible. NTPC requested NRLDC to ensure scheduling well in time so that post facto revisions can be reduced. NRLDC representative requested and this based on last data and gives fairly good picture wherein actual are consistently lower than actual and few cases could not be the reason and requested all the generating stations to generate as per schedule. 26 Hydro generation beyond 100% of installed capacity NRLDC representative stated that 5 th amendment to the CERC (Indian Electricity Grid Code) Regulations, which has come into effect from 01st May 2017 says for the purpose of ensuring primary response, RLDCs/SLDCs shall 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. The same was communicated to all entities vide NRLDC letter No. NRLDC\SO-117\ dated 21 st June 2017 to all constituents of Northern Region. Figures attached as Annexure-26 of the Agenda of the 140 th OCC meeting show some regional hydro generators which have generated more than their installed capacity (% w.r.t I.C.) during some part of the day in first 10 days of October month. These are listed below. Rampur (109%) Karcham Wangtoo (108%) Tehri (106%) Nathpa Jhakri (106%) Tanakpur (106%) Sewa-II (105%) NRLDC also stated that generation above the limit could also be due to governor action but issue arises when it is on sustained basis as has been the case for some the generators. In the OCC meeting NHPC Representative stated as under: Since Tanakpur Power Station is purely ROR (Run off River), RGMO is not applicable for this Power Station. The generation mainly depends upon the availability of water and inflow, as such during day time generation increases in few blocks (beyond installed capacity) due to sudden increase in inflow. However during the mentioned period i.e. from to spillage has been observed at Tanakpur Power Station. Regarding Sewa-II, it is submitted that during the period as stated above (1st Oct to 10th Oct. 2017), the generation exceeded only in few blocks (beyond installed capacity), which may be due to Governor Response. However, NHPC informed that the Power Stations are regularly being advised to comply with the IEGC provisions and advisory issued by NRLDC time to time. OCC agreed that all hydro generators shall give schedule/generate as per their capability & shall ensure sufficient margin for providing governor action as primary response. 37

38 27 Over drawl by states and low frequency in grid NRLDC representative intimated that on 3 rd October 2017, considerably low frequency was observed throughout the day. It was clear from the graphs shown in 140 th OCC agenda and presentation that Haryana, HP and UP were overdrawing from the grid (deviation from schedule) and at the same time considerably low frequency was observed Frequency profile for 3 rd of Oct 2017 is shown below. <49.2 <49.7 <49.8 <49.9 < >50.2 > Frequency remained below Hz for 84.57% of time & in the band for 69.75% of time. It was highlighted that Rajasthan state control area has also been overdrawing for last 10 days. Fig. showing overdrawl (deviation from schedule) by Rajasthan in October 2017 was shown. UP representative stated that deviation (overdraw) by their control area was after keeping in mind commercial point of view. Deviation from schedule of all NR states for last 20 days prior to the OCC is attached as Annexure. 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. 38

39 Serious concern was expressed on the fact that frequency had remained below Hz for 84.57% of time & in the band for 69.75% of time. Rajasthan was requested to look into the matter on priority 28 Tap optimization in Northern Region NRLDC identified 765/400kV & 400/220kV nodes at which tap change exercise which will be of significant advantage to the grid using simulation studies on PSSE software and are listed below. 400/220 kv ICTs- Tap Change from 9b to 11 S. No. Region State Nodes 1 NR-1 2 NR-2 Delhi Rajasthan Haryana Himachal Pradesh Jammu & Kashmir Punjab Maharani Bagh, Mandola Akal Jodhpur Abdullapur, Bahadurgarh, Ballabhgarh, Bhiwani (BBMB), Daulatabad, Dipalpur, Fatehabad, Gurgaon, Kabulpur, Manesar, Nuhiyanwali, Panchkula, Sonepat Chamera-Pooling Hamirpur Kishenpur Amritsar, Dhuri, Jalandhar, Ludhiana, Makhu, Malerkotla, Moga, Muktsar, Nakodar, Patiala, Rajpura 3 NR-3 Uttar Pradesh Azamgarh, Lucknow (UP), Meerut, Sohawal Tap Change from 9b to 13 1 NR-1 2 NR-2 765/400 kv ICTs- Delhi Rajasthan Haryana Himachal Pradesh Bawana Bhiwadi, Neemrana, Sikar Kaithal Nallagarh S. No. Region State Nodes Tap Change from 12 to 10 1 NR-2 Haryana Bhiwani (PG) Tap Change from 12 to 8 2 NR-3 UP Meerut (PG) OCC approved above changes in tap positions and advised all to get them changed. In the OCC Meeting as decided earlier all States were requested to present their studies/suggestions in this regard so that the further necessary action can be taken in this regard in the upcoming winter season. States were once again requested to carry out 39

40 studies/ provide suggestions as early as possible so that tap-changes can be exercised before onset of winter. 29 Reliability Issues: Punjab: High loading of 400/220kV Amritsar, Ludhiana, Malerkotla, Makhu has been observed during high import from grid. Underlying network of Amritsar, Ludhiana, Dhuri & Jalandhar are also loaded and need attention to take care of any N-1 contingencies in this area. 500MVA ICT2 at Dhuri out since & 500MVA ICT3 at Rajpura (only one 500MVA ICT now supplying load) out since need to be revived. Haryana: N-1 non-compliance was been observed at Kaithal. Kirori ICTs also become N-1 non-compliant when load of Haryana is more than 9.5 GW. Isolator rating issues at Dhanonda & Nawada, Outage of 400kV Jhajjar- Dhanonda D/C on tower collapse also pose challenge to evacuation of HVDC Mundra-Mahendergarh / CLP Jhajjar. Rajasthan: High loading of 400/220kV Sikar, Akal has been observed. N-1-1 noncompliance of Kawai-Kalisindh-Chhabra complex has been continuously flagged and discussed in regular OCC/TCC meetings. N-1 non-compliance at 400/220kV Jodhpur and Merta S/s needs to be attended. 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. High voltage at Suratgarh, Akal & Jodhpur area has also been observed and reported continuously. Uttar Pradesh: N-1 non-compliance has been observed at 400/220kV ICTs of Azamgarh, Moradabad, Meerut, Obra, Muradnagar, Agra (UP), Lucknow (PG), Lucknow (UP), Gorakhpur (PG) etc. Evacuation issue of Lalitpur/Paricha & Bara TPS under N-1-1 contingencies is still present. Evacuation issues of Anpara-D/Anpara-C under N-1 contingency of 765kV Anpara C-Unnao. Low voltage at 400kV Sultanpur, Gorakhpur, Azamgarh & various 220kv nodes has been observed. UP said that proposal for 3 rd ICT at Moradabad is being taken up and load shifting in nearby areas is also under discussion. As reported by UPPTCL CT/CB/Isolators of Dadri bays installed at 400kV Greater Noida S/s are designed for 2000A only, with ambient temperature at 42 C & above the current carrying capacity of above equipments goes down further. Similarly at Dadri end the CT capacity is 2000A only & at 400kV Nawada also the rating of CTs/CBs/isolators installed for Nawada- Greater Noida line are of rating of 2000A only. NRLDC representative stated that with the commissioning of 400kV Gr.Noida- Gr. Noida (Existing S/s) has slightly relieved the loading of 400kV Dadri-Greater Noida line. Flow of 400kV Dadri-Gr. Noida is largely affected by generation at Tehri and Koteshwar. When generation at Tehri and Koteshwar is high, power flow from Meerut Mandola Dadri is substantially more whereas when generation at Tehri and Koteshwar is low, power flow from Meerut Mandola Dadri is on the lower side. Thus, when generation at Tehri & 40

41 Koteshwar is high, flow on Dadri-Gr. Noida increases. Gr. Noida-Nawada was opened on no. of occasions to control the loading of Dadri-Gr. Noida. Delhi: 400/220kV ICT loading at Bamnauli. Bus split at Bamnauli leads to asymmetrical loading and thus N-1 non-compliant. Tower collapse of Bamnoli-Jhatikara#1 (other ckt is on ERS), outage of 400kV Bawana-Mundka D/C affecting the reliability of 400kV Delhi ring. Uttarakhand: Loading on 400/220 kv Kashipur ICTs is not N-1 compliant in case of high import (Gas generation at interconnection of 220kV Kashipur would relief the loading of Kashipur ICTs) & Loading on 220 kv Roorkee (PG) Roorkee. Telemetry issue for Uttarakhand as well. Jammu & Kashmir: N-1 non-compliance of 400/220kV Wagoora ICT, underlying 220kV network of Wagoora, Kishenpur) in Kashmir area. In the meeting the issue regarding the reliability issues was discussed at length. UP & HVPNL representative informed that their planning wing is already looking into these issues. As regards Delhi, Rajasthan & UP it was highlighted as under: 41

42 42

43 Also the issue regarding the opening of Greater Noida Nawada to control loading of Dadri- Greater Noida was discussed. The increase in generation of Tehri- effects loading of Dadri-Greater Noida: 43

44 S.N o Element Name Outage Revival Total outage Date Time Date Time hrs:mins:sec 1 400kV G.Noida(UP)-Nawada : :07 3:14: kV G.Noida(UP)-Nawada : :34 12:24: kV G.Noida(UP)-Nawada : :16 13:26: kV G.Noida(UP)-Nawada : :43 12:25: kV G.Noida(UP)-Nawada : :27 12:58: kV G.Noida(UP)-Nawada : :04 16:50: kV G.Noida(UP)-Nawada : :58 37:55: kV G.Noida(UP)-Nawada : :06 15:38: kV G.Noida(UP)-Nawada : :27 18:52: kV G.Noida(UP)-Nawada : :19 15:51: kV G.Noida(UP)-Nawada : :21 36:41: kV G.Noida(UP)-Nawada : :37 12:57: kV G.Noida(UP)-Nawada : :46 12:32: kV G.Noida(UP)-Nawada : :56 18:21: kV G.Noida(UP)-Nawada : :10 15:17: kV G.Noida(UP)-Nawada : :08 14:36: kV G.Noida(UP)-Nawada : :45 14:10: kV G.Noida(UP)-Nawada : :22 13:26: kV G.Noida(UP)-Nawada : :55 13:13: kV G.Noida(UP)-Nawada : :22 11:55: kV G.Noida(UP)-Nawada : :32 11:24: kV G.Noida(UP)-Nawada : :20 23:26: kV G.Noida(UP)-Nawada : :33 12:07: kV G.Noida(UP)-Nawada : :35 12:18: kV G.Noida(UP)-Nawada : :55 11:58: kV G.Noida(UP)-Nawada : :32 13:14: kV G.Noida(UP)-Nawada : :52 13:20:00 420:28:00 44

45 NRLDC representative stated that 400kV G. Noida-Nawada was out for ~109 hours in Aug 17 and ~311hours in Sep 17. He stated that apart from commissioning of 2 nd circuit of 400 kv G Noida- G Noida ckt, other avenues shall be thought of by planners. UPPTCL was requested to change the poor rating isolators within the next 2-3 months to improve the reliability of Dadri-G.Noiada ckt. Haryana representative requested that 400kV G. Noida-Nawada line be opened from only one end i.e. from Nawada. This will slightly enhance reliability of supply at Nawada in case Nawada-Ballabhgarh trips (less time in normalizing supply to Nawada area). Request made by Haryana was agreed upon by OCC. 30 Reliability of telemetry NRLDC representative stated that telemetry issues at the level of 400 kv and above system are not attended and remain unavailable for long period. Telemetry from Suratgarh Critical TPS is yet to be made available though the station has been charged without even having a plan for data communication. Data from 400kV Kashipur (Communication Issue) is not available since 13 th August, 2016, Chhabra TPS (Gateway Faulty) is not available since 25 th June, 2017 and Salal HPS (Communication issue) telemetry failed on 29 th August, Telemetry for all these stations is still to be made available. In the meeting NRLDC representative also highlighted that the stations are coming up without any communication planning and ad-hoc arrangements are being made for making the data available which are not at all reliable. Apart from above, no action is being taken for improvement in the reliability of telemetry from important substations and 45

46 generating stations as detailed. It was desired that the communication plan needs to be tied up when stations are planned. The representative of NHPC informed as under: NHPC replied that OPGW connectivity at Salal, Chamera-I, Chamera-II and Chamera-III power station is down since 1 st week of September due to fault in OPGW link between Tibber and Kishenpur. The telemetry data of Chamera-I, Chamera-II and Chamera-III power stations are being communicated through MPLS but due to problem in RTU at Salal Power Station the same is not being transmitted. PGCIL deployed the service engineer of Synergy (Maintenance Agency of RTU) to rectify the RTU problem but the same could not be rectified by them. PGCIL replied that after obtaining the information from concerned person the status of same shall be submitted to NRPC/NRLDC. SE NRPC requested all utilities to ensure proper & reliable telemetry. 31 SPS operation in the month of Sep 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: Date Time S. (dd- Event SPS (in No. mmm- yy) Description logic hrs) Planned operation Actual operation Relief occurred (MW) Remarks It is once again discussed in 139 th OCC meeting but compliance is still very low from most of the NR utilities. Details of SPS operation for the month of Sep-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. Reason / Status of SPS Report submission No Element Name Type Voltage Level Owner Outage Antecedent As per planned Date Time Remarks Power Flow SPS operation Punjab Haryana Rajasthan UP Delhi POWERGRID Case-2 Reported 1 Balia-Bhiwadi Transient fault Bipole power operated; Load load relief: Line 500 kv HVDC PGCIL :41, km order: shedding in A, MW Pole 1 & 2 from Balia 1000MW B, C & load against group 170MW 2 Balia-Bhiwadi Pole 1 & 2 Line 500 kv HVDC PGCIL :12 Transient fault at kms from Balia Bipole power order: 600MW Case-1 operated; Load shedding in C & load group Reported load relief: 57MW against 120MW

47 A planned SPS detail of HVDC Balia-Bhiwadi is as below: Case Contingency Action Case-1 Tripping of pole resulting in power order reduction by more than 500 MW and up to 750 MW. (Measured at Bhiwadi) Shed Loads in Groups C & D (of Fig 1 Load Details). Case-2 Tripping of pole resulting in power order reduction by more than 750 MW and up to 1500 MW. (Measured at Bhiwadi) Action-1:- Shed Loads in Groups A, B, C & D as Described (of Fig 1 Load Details). Action-2:- Automatically back down generation by 250 MW at Singrauli-Rihand complex in Northern region and by 250 MW in the Eastern region at Kahelgaon in the shortest possible time Case-3 Tripping of poles resulting in power order reduction above 1500 MW and up to 2000 MW.(Measured at Bhiwadi) Action-1:- Shed loads in Groups A, B, C, D, E & F (of Fig 1 Load Details). Action-2:- Automatically back down generation by 750 MW at Singrauli-Rihand complex in northern region and by 750 MW in the eastern region at Kahelgaon/ Barh/ Farakka in the shortest possible time. Case-4 Tripping of poles resulting in power order reduction above 2000 MW. (Measured at Bhiwadi) Action 1:- Shed loads in Groups A, B, C, D, E, F & G (of Fig 1 Load Details). Action 2:- Automatically back down generation by 750 MW at Singrauli-Rihand complex in northern region and by 750 MW in the eastern region at Kahelgaon/ Barh/ Farakka in the shortest possible time. Remark: 1. The envisaged automatic backing down of generation in the Singrauli-Rihand complex for Case-2 is yet to be implemented. 2. Load Shedding shall be achieved within 500ms, including all signal propagation / breaker opening time delay 47

48 140 th OCC meeting: The representative of NRLDC appraised that for the above two mentioned SPS operation, report has been received only from Rajasthan. 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 two SPS operations did not tripped leading to load relief of only 17% and 28% respectively in the two incidents. Utilities were informed about the feeders which were required to provide load relief but did not. Name of the feeders are: 220kV Samaypur-Palwal ckt-1 & 2 220kV Gobindgarh and Laltokalan station of Punjab 132kV Kota-Talera Members were requested to rectify the issue at the earliest to minimize such mis-operation 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 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. 32 Frequent forced outages of transmission elements The following transmission elements were under frequent forced outages during the month of Sep 17: S. No. Element Name No. of forced outages Utility 1 HVDC Champa(WR) - Kurukshetra(NR) line-1 8 POWERGRID 2 HVDC Champa(WR) - Kurukshetra(NR) line-2 6 POWERGRID 3 HVDC 800kV Agra - Biswanath Cherialli line-1 5 POWERGRID 4 400kV Aligarh(UP)-Muradnagar(UP) 4 UP 5 400kV Bikaner(RVPNL)-Merta(RVPNL) 4 Rajasthan 6 HVDC 500kV Balia-Bhiwadi line-2 4 POWERGRID 7 765kV Agra(PG)-Fatehpur(PG) ckt-2 3 POWERGRID 8 Banda(UP), 400/220kV 315 MVA ICT 1 3 UP 9 400kV Bareilly(PG)-Kashipur(PTCUL) ckt-1 3 POWERGRID/Uttarakhand kV Bhadla(RVPNL)-Bikaner(RVPNL) ckt-1 3 Rajasthan The complete details are attached at Annexure-32 of the Agenda of the 140 th OCC meeting. 48

49 Further, the list of ten most frequent transmission element outages since Apr 17 included in OCC meetings is as below: S. No. 1 Transmission line No. of forced outages Utility 800kV HVDC Champa(WR) - Kurukshetra(NR) line POWERGRID 2 400kV Agra(UP)-Unnao(UP) 21 UP 3 HVDC Vindhyachal BtB Block-1 11 POWERGRID 4 400kV Bikaner(RRVPNL)-Merta(RRVPNL) 11 Rajasthan 5 400kV Aligarh(UP)-Muradnagar(UP) 10 UP 6 400kV Aligarh(UP)-Sikandrabad 400(UP) ckt-2 8 UP 7 800kV HVDC Agra(PG)-Biswanath Cherialli (PG) line-2 7 POWERGRID 8 NHPC/ 132kV Mahendranagar(ER)-Tanakpur(NHPC) 7 POWERGRID/ Nepal 9 400kV Dhuri(PSTCL)-Rajpura(PSTCL) ckt-2 7 Punjab kV Agra-Fatehpur(PG) ckt-2 6 POWERGRID It could be seen that issues like no auto-reclosing, mal-operations, 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. Hence, Utilities are requested to look into such frequent outages and share the remedial measures taken/being taken in this respect. NHPC representative stated that due to over drawl by Nepal, 132kV Mahendranagar(ER)- Tanakpur(NHPC) tripped frequently on over current. NRLDC asked about the over current setting and other information s pertaining to above transmission lines. The present setting of 150A for over current intimated to NRLDC. NRLDC suggested that the tripping report and other information s may be submitted to them in case tripping of 132kV Mahendranagar-Tanakpur(NHPC) line occurs in future. NHPC confirmed that the reports are being sent by Power Station regularly, however it shall be checked and regularly complied. Rajasthan representative stated that frequent tripping of 400kV Bikaner-Merta line was due to issue of Alstom make PLCC channel at Merta end and same has kept out of service. It was discussed and deliberated in 135 th, 136 th, 137 th, 138 th, 139 th & 140 th OCC 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. In 139 th OCC meeting, OCC asked all concerned utilities to submit the remedial action taken report for frequent tripping of aforesaid elements. It is once again requested to all the concerned utilities to submit the details within 15days 49

50 33 Tripping of 400kV and above transmission elements on DT (Direct trip) NRLDC representative intimated that the following transmission elements were tripped from Sep-2017 onward: S. Voltage No. Level LINE NAME End B (Ownership) TRIP DATE RESTORATION DATE Outage Duration Reported Reason Remarks (As per PMU data) kv Agra-Gwalior -2 PGCIL 01/09/17 21:51 01/09/17 22:19 00:28 DT received at Agra end No fault kv Aligarh - Panki UPPTCL 07/09/17 12:31 07/09/17 17:44 05:13 DT recvd at Aligarh No fault kv Fatehabad-Nuhiyawali 2 HVPNL 13/09/17 12:01 13/09/17 17:15 05:14 DT received at Fatehabad end due to PLCC maloperation at Nuhiyawali. No fault kv Gorakhpur(PG)- DT received at Gorakhpur. Detailed PLINK 21/09/17 11:40 21/09/17 13:14 01:34 Lucknow(PG) 2 report awaited. B-phase to earth fault kv Bikaner-Merta RRVPNL 21/09/17 20:40 22/09/17 00:39 03:59 DT received at Merta end. No fault kv Bikaner-Merta RRVPNL 22/09/17 06:44 22/09/17 17:55 11:11 DT received at Bikaner No fault 7 G.Noida 765(UP)-Mainpuri 765 kv UPPTCL 765(UP) 27/09/17 11:38 27/09/17 15:41 04:03 DT recd at 765kV G. Noida end. B-phase to earth fault 8 Fatehabad 765(UP)- 400 kv Mathura 400(UP) 1 UPPTCL 27/09/17 17:36 27/09/17 18:22 00:46 DT received at Mathura end. No fault kv Jalandhar(PG)-Samba(PG) NRSS /09/17 11:42 28/09/17 11:53 00:11 DT received at Jalandhar. No fault kv Bikaner-Merta RRVPNL 28/09/17 23:08 28/09/17 23:44 00:36 DT received at Bikaner No fault kv Ratangarh-Suratgarh 1 RRVPNL 30/09/17 08:00 01/10/17 23:23 39:23 Tripped due to DT received at STPS end. No fault kv Aligarh(UP)-Mainpuri 765(UP) 2 UPPTCL 02/10/17 21:41 03/10/17 01:10 03:29 DT Received at Mainpuri kv Bikaner-Merta RRVPNL 04/10/17 10:30 04/10/17 11:45 01:15 DT received at Bikaner No fault kv Bikaner-Merta RRVPNL 04/10/17 19:45 04/10/17 22:07 02:22 DT received at Bikaner No fault kv Koldam(NTPC)- Ludhiana(PG) -2 PKTCL 10/10/17 10:28 10/10/17 13:57 03:29 DT received at Koldam end. No fault No fault, Before the incident there was fault at 21:39hrs In the OCC meeting all utilities concerned were requested to look into the matter at the earliest. OCC asked all concerned utilities to submit the remedial action taken report for aforesaid elements within 15days. 34 Multiple element tripping events in Northern region in the month of Sep-2017: A total of 18 grid events occurred in the month of Sep Out of these, 9 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 is attached at Annexure-34 of the 140 th OCC meeting. It could be seen that a fault clearance of the order of 1720ms {22 nd Sep 2017: Multiple element tripping at 400/220kV Lucknow (UP)} has been observed which is very much exceeding the standard value of 100ms. Further, despite persistent discussions/follow-up in various OCC/PCC meetings, the compliance of the regulations is still much below to the desired level. The summary of the attached table is as below: Preliminary Report or DR/EL received within 24hrs: 3 events DR/EL received after 24hrs: 8 events Fault clearance time (based on PMU data) more than CEA grid standard: 8 events Line tripping without any fault (based on PMU data): 3 events 50

51 Consolidated status plots are as below: 51

52 52

53 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. UP & Power Grid were emphasized to ensure that the Preliminary Report, DR/EL & Detailed Report of the events are provided by the concerned, in time. However, it was noted that the situation as concerned to submission of reports by Rajasthan had improved. Representative of NRPC stated that incident which occurred due to human error was really unfortunate. He requested UP and all other utilities to have proper training for maintenance team to avoid such kind of tripping s in future 35 Details of tripping of Inter-Regional lines from Northern Region for Sep 17: A total of 29 inter-regional lines tripping within a month occurred in the month of Sep 17. The list is attached at Annexure-35 of the Agenda of the 140 th OCC meeting. 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. 53

54 The summary of the attached table is as below: Preliminary Report or DR/EL received within 24hrs: 2 events DR/EL received after 24hrs: 1 events Line tripping without any fault (based on PMU data): 6 events Consolidated status plots are 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 related to Power Grid. 36 Mapping of UFR and df/dt: The latest status of UFR & df/dt as discussed during 139 th OCC meeting is tabulated below: States UFR df/dt Remarks J&K No No UP Yes Yes Haryana Yes Delhi Yes Yes Yes (Only stage-1) Following not provided: Feeder-wise planned load relief. Complete telemetry of feeders. Alternate feeders. Total planned relief. (Stage wise) Total actual relief. (Stage Wise) Following not provided: Feeder wise planned load relief. Complete telemetry of feeders. Alternate feeders for both UFR and df/dt. UFR Stage nomenclature needs to be modified (Stage-1: 49.2Hz) Total actual relief. Following not provided: Total of actual analog data of MW and alternate feeders. Data suspected for most of the digital and Analog value 54

55 HP Yes Yes Uttarakhand No No Punjab Yes Yes Rajasthan No Yes Following not provided: Complete telemetry of feeders. Complete Alternate feeders. Segregation of stage wise load Following not provided: Complete telemetry of feeders. Alternate feeders. Digital Status of all the feeders Lower actual load relief (As per SCADA data) Following not provided: Analog value and digital data not available Only alternate feeder details provided The UFR and df/dt mapping is mandatory as per Hon ble CERC regulation. The issue has been discussed in various OCC, NRPC-TCC meetings. However, it could be seen that the State UFR, df/dt displays are not exactly as per the approved format. 137 th OCC meeting: MS NRPC once again reiterated that mapping of UFR has to be done in the SCADA of SLDC & NRLDC for better visibility of relay status and feeder load relief and emphasized upon the importance of digital breaker status of feeders in such defense schemes. 136 th & 137 th OCC meeting: It was discussed that in addition to the SCADA mapping, States should provide the following information regarding the UFR, df/dt relays installed at their respective substations: Source of frequency measurement for UFR, df/dt relay viz. positive sequence, phaseto-neutral, phase-to-phase. Computational time for measurement of frequency, rate of change of frequency in UFR, df/dt relays respectively. State utilities are requested to submit the above information at the earliest and correct, provide the SCADA UFR, df/dt displays as per the comments. 139 th OCC meeting: The one to one VC with individual SLDC (similar to one to one interaction for FRC) was planned for better understanding and use of SCADA display of UFR and df/dt mapping. Proposed schedule versus actual status for one to one VC is as given in the meeting. S. No. SLDC Date Time Status 1 Punjab :00Hrs Done 2 Haryana :00Hrs Done 3 Delhi :00Hrs Done 4 Uttar Pradesh :00Hrs Done 5 Rajasthan :00Hrs 04 th Oct

56 6 Uttarakhand :00Hrs To be done 7 Himachal Pradesh :00Hrs Done 8 J&K :00Hrs Mail sent, VC facility not available 9 Chandigarh :00Hrs To be done Important outcome during VC of UFR and df/dt is as below: Punjab: Punjab has already planned for complete availability of telemetry of 132kV and above voltage level. Lower voltage level at these stations would also be covered. RTU would be installed at 50% of the 220 & 132kV station till March RTU would be installed at 100% of the 220 & 132kV station till December No telemetry available at 66kV remote end sub-stations. Haryana: SLDC-Haryana representative informed that they would take corrective actions for availability of Analog and digital data in SCADA display of UFR and df/dt. Approved Target date : 30th Oct 2017 Delhi: Low percentage of availability of analog/digital data in SCADA display may be due to ICCP mapping of data points. It would be taken care by SLDC-Delhi. Uttar Pradesh: Name of the feeders was properly updated in the SCADA mapping but analog data and digital data was not available for most of the main feeders. Name and SCADA data of alternate feeders was also not mapped. UP SLDC informed that to obtain adequate relief during actual incident more no. of feeders are designated to provide relief. 35 number of 220kV sub-station would be completed by Mar-2018 & 30 number of 220kV sub-station would be completed by Dec For remaining 220/132kV or 132/33kV stations, scheme yet to be planned. Himachal Pradesh: Name of the feeders and alternate feeders was properly updated in the SCADA mapping of UFR relays but analog data and digital data was not available for most of the main feeders of UFR relays. Alternate feeders/ ICTs details shall also be updated in SCADA mapping of df/dt relays. Designated load relief for df/dt stage-2 was lower than the stipulated relief. No telemetry available at 33kV sub-stations except Open Access consumer. New scheme for installation of RTU in 37 locations of 66kV has been submitted under PSDF scheme. Rajasthan: Name of the feeders and alternate feeders was properly updated in the SCADA mapping but analog data and digital data was not available for most of the main feeders. New RTU installation work has been awarded for 68 important 132kV stations. Target completion date is Mar New scheme for installation of RTU in location of 132kV stations is under planning stage. Rajasthan SLDC informed that to obtain adequate relief during actual incident more no. of feeders are designated to provide relief and the same are also mapped in SCADA. RLDC suggested all the constituents to segregate the 33kV based locations of UFR and df/dt relays in following three stages: Where already RTU installed at 132kV stations, wiring of 33kV feeders to RTU to be done. The work targeted to be completed within three months. 56

57 Where new 65 RTUs installed at 220kV stations, 33kV and above feeders covered under UFR and df/dt to be wired on priority basis. Where new scheme to be approved for remaining location of 220kV & 132kV stations, expedite the scheme and also cover the remaining 33kV and above feeders at least those covered under UFR, df/dt scheme and SPS. Detailed discussion points outcome during VC is attached as Annexure-36 of the Agenda of the 140 th OCC meeting. In the OCC meeting all the state utilities were requested to submit the information asked in the Annexure-36 at the earliest possible. Also they were requested to correct the SCADA UFR, df/dt displays as per the comments. 37 EHV line tripping due to fog during winter: NRLDC representative stated that as discussed in 139 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. Format is as below: Status of replacement of Porcelain insulators with Polymer insulators As on- S.No. Name of Line/voltage / S/C or D/C Voltage Level (in kv) Total Length of line (in km) Line details Total Towers location (Nos) Total Insulator Length Strings (km) (Nos) Insulators to be replaced by Polymer (Target for this year) Total Towers Locations (Nos) Total Insulators Length Strings (in km) (Nos) Progress (Work already completed) Total Towers Locations (Nos) Total Insulators Strings (Nos) Schedule for completion of Replacement Start Date End Date Remarks (If only partial location of the line has planned then may please indicate the location numbers or part kms of line which have been planned) Note: 1. Line constructed with Polymer Insulator may please also be indicated in the table 2. Similar separate table shall be formulated for Anti-fog insulators line as well for line which would be cleaned 3. Lines for whom there is no planning of cleaning or replacement may please also be given in the table but with '--' in planning as well as progress columns Detailed Format and Line details were attached as Annexure-23C of 139 th OCC Agenda. 57

58 In the meeting the importance of cleaning / replacement of polymers before the onset of winter was again highlighted & was requested that the details may be shared by 20 th Oct Power Grid and other utilities were requested to expedite the submission of the information of their lines. 38 Revision of document for Reactive Power Management for Northern Region: NRLDC representative intimated that as discussed in 139 th OCC meeting, Reactive Power Management document for Northern region is due for revision. The last updated document link is as below: 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 139 th OCC Agenda. In the meeting all Constituents were again requested to provide the feedback, suggestion and updated information by 20 th October Revision of document for System Restoration Procedure (SRP) for Northern Region: As discussed in 139 th OCC meeting, 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. Details have been received only from NHPC. All constituents (except NHPC) in the meeting were requested to provide the feedback, suggestion and updated information by 20 th October

59 40 Workshop on System restoration and Power transfer capability assessment: NRLDC representative stated that as informed in 139 th OCC, NRLDC has planned to organize the following one day workshops: a) One day workshop on system restoration in Northern Region on 10 th Nov Representatives from all power stations are requested to be present in the workshop & share details regarding the following: Healthiness of Diesel Generator(DG) sets at black start sources Capability curve of the black start generator Governing system at generating stations for frequency control Experience of black start exercise conducted recently Representative from Railways are also requested to be present & share latest details regarding traction feeding points, traction load, provision for phase balancing (Scott Connection) & contact details of nodal persons etc. Representatives from generating stations, transmission utilities (ISTS), SLDCs, ALDCs are requested to participate & share the relevant details in respect of their system as under. Updated directory of key personnel for Crisis Management Power Map for States b) One day workshop on system studies and ATC/TTC assessment is being organized on 30 th Oct Importance of system studies is well known as same is being used for operational planning & studies (reactive compensation, shutdown coordination, Transfer Capability computations etc.) as well as for transmission charges sharing computation. NRLDC has communicated about the workshop giving brief details about the outline of workshop vide its letter NRLDC/TS-31/ dated It was requested to all the constituents to nominate 2-3 concerned officers for the workshop or inform if they would be connecting through video conferencing. NRLDC representative intimated that no nominations have been received in this regard from any of the constituents for both the above workshops. It was once again requested to nominate suitable officers for the workshop. It was also proposed that for the workshop on system restoration one or two state representative may prepare a presentation for restoration procedure in the state and share the details during the workshop. 41 Deviation Violation Deviation violations of September 2017 were more than that of August All States were asked to minimize the deviations from the schedule. Some of the violations are given below: Violation of regulation 7 (1) of CERC (Deviation Settlement and related matters) Regulation 2014: (Limit on volume of deviation) 59

60 Table-1: Period: to S.No. State 1 J&K 2 Uttar Pradesh 3 Himachal Pradesh 4 Rajasthan 5 Haryana 6 Uttarakhand 7 Punjab 8 Delhi 9 Chandigarh O/D: Violation in Over drawl Average No of Blocks U/D: Violation in per day Under drawl O/D 54 U/D 7 O/D 50 U/D 11 O/D 45 U/D 13 O/D 33 U/D 13 O/D 27 U/D 9 O/D 17 U/D 28 O/D 15 U/D 13 O/D 3 U/D 11 O/D 0 U/D 17 Remarks: Violation is considered while Deviation from Schedule of a Utility is 150 MW or 12% of Schedule whichever is lower. 60

61 Violation of regulation 7 (10) of CERC (Deviation Settlement and related matters) Regulation 2014: (Sustained deviation from schedule in one direction). 01-Sept- 17 to 24- Sept-17 Chandigarh PD D J&K Himachal Pradesh Delhi Uttarakhand Uttar Pradesh Rajasthan Haryana Punjab Total No. of Violation In the meeting, all constituents were asked to take remedial measures to arrest such large and almost continued deviation from the schedule. All members agreed for the same. 42. A presentation was made on the IMPLEMENTATION OF FRAME WORK ON RENEWABLE AT STATE LEVEL OF NORTHERN REGION is enclosed as Annexure 42 61

62 Annexure 2 A < 49.7 Hz(%) <49.8 Hz(%) <49.9 Hz(%) Hz(%) Hz(%) >50.10 Hz(%) >50.20 Hz(%) Freq. Profile & Deviation by constituents : Sept-2017 Max Freq. Min Freq. Dates <49.7 <49.8 <49.9 Punjab HAR Raj. Delhi UP UK HP JK CHD (Hz) (Hz)

63

64 SL. No Element Name Type Voltage Level Owner Outage Date Time Expected Revival Date 1 Akal-Jodhpur II Line 400 kv RRVPNL :11 10/10/2017 Reason / Remarks --- As per DGA Test Result of 50 MVAR reactor Sr. No. T09528/03 installed at 400 kv GSS RRVPNL Akal Test Result showing violation of almost all the gases.m/s CGL wish for internal Inspection of 50 MVAR reactor Sr. No. T09528/03 of 400 KV Jodhpur line,which is under shutdown vide NRLD code 1266 & LD code 389 on dated KV Akal-Jodhpur line is also to be shifted from Dia 04 to dia 02 with the work of line reactor.line Reactor is already Shutdown vide NR No.1266, and LD No. 389 Dated Auraiya 315 MVA ICT 2 ICT 400/220 kv PGCIL :51 NA Oil leakage in transformer. 3 Makhu 80 MVAR B/Reactor 1 4 Merta 50 MVAR (400kV) B/Reactor 1 Bus Reactor Bus Reactor 400 kv PSEB :37 10/10/ kv RRVPNL :01 10/10/ FSC of Pampore-2 at Kishnpr FSC 220 kv PGCIL :00 NA 6 FSC of Pampore-1 at Kishnpr FSC 220 kv PGCIL :00 NA kv (3*110) 330 MVAR Line Reactor (Non-Switchable) of Unnao ckt 1 at Anpara D TPS Bamnauli(DTL)-Jhatikara(PG) 1 Line Reactor 765 kv UPPTCL :19 NA Line 400 kv DTL :29 10/10/2017 Y-Ph. ten delta test results not within limits Construction of new element --- for dismantling this 50 MVAR Bus Reactor(this reactor shall be shifted to 400kv Bhilwara) and replacing/commissioning with new TEBA make 125 MVAR Bus Reactor at Merta. Line length has reduced after LILO work completion Line length has reduced after LILO work completion Due to not completion of 765 kv Line Anpara D Tower damage (First dead end tower from Bamnauli S/S) / Ckt-II charge through ERS tower

65 SL. No Element Name Type Voltage Level Owner Outage Date Time Expected Revival Date Reason / Remarks 9 Bawana-Mundka 1 Line 400 kv DTL :03 Fire below 400kV tower no. 116, in the line 10 Bawana-Mundka 2 Line 400 kv DTL :50 11 Dhanonda-Jhajjar CLP-2 Line 400 kv HVPNL :00 12 Dhanonda-Jhajjar CLP-1 Line 400 kv HVPNL :00 Manually Opened due to Fire below 400kV tower no. 116, in the line leading to Insulator damage and Tower bend Tower No. 12 to 17 collapsed Tower No. 12 to 17 collapsed. 13 Kalisindh 315 MVA ICT ICT 400/220 kv RRVPNL 4/6/ :50 Buchholz relay operated. 14 Rajpura (400kV) 500 MVA ICT 3 ICT 400/220 kv PGCIL :02 Buchholz relay operated / Detail inspection work. 15 Bhadla(RVPNL) 500 MVA ICT 1 ICT 400/220 kv RRVPNL 9/8/2017 7:02 Buchholz, PRV & Differential protn. optd. 16 Dhuri(400) 500 MVA ICT 2 ICT 400/220 kv PSEB :47 Buchholz relay operated / will replace by new. 17 Maharanibagh 500 MVA ICT 2 ICT 400/220 kv PGCIL 1/9/ :19 Bus bar protection operated due to flashover in ICT-II Gas chamber

66 SL. No Element Name Type Voltage Level Owner Outage Expected Revival Date Reason / Remarks Date Time 19 FACT at BLB in Knp-BLB Line FACTS 400 kv PGCIL 2/7/ :20 NA Y-Phase current imbalance 20 FSC (40%) of Fatehpur-I at MainpurI(PG) FSC 400 kv PGCIL 2/3/2017 7:38 NA B-Ph spark gas cable fail 21 FSC (40%) of Fatehpur-II at MainpurI(PG) FSC 400 kv PGCIL 7/5/ :13 NA B-ph Capacitor unbalance 22 FSC ( 50% ) of Koteshwar Pool -2 at Meerut (PG) FSC 400 kv PGCIL :22 NA Fire in Y-ph unit kv 50 MVAR Line Reactor (Non- Switchable) of Jodhpur II ckt 1 at Akal (RRVPNL) Line Reactor 400 kv RRVPNL :15 NA Shutdown For internal inspection after DGA test report showing violation of all gases 24 Kishenpur(PG)-Ramban(JK) Line 220 kv PDD JK :55 NA Tower collapsed at tower No. 82 from Kishenpur end as informed by SLDC Jammu

67 SL. No Station Location Owner Unit No Capacity Reason(s) 1 RAPS-A RAJASTHAN NPC Subject to regulatory clearance Outage Date Time Expected Revival Date 9/10/ :58-2 Badarpur TPS DELHI NTPC Badarpur TPS DELHI NTPC Badarpur TPS DELHI NTPC Bhakra-L HPS HP BBMB Order of NGT for Environmental protection Order of NGT for Environmental protection Order of NGT for Environmental protection Replacement of Generator Shaft :29-9/10/2015 1: :30-1/4/2016 9: Faridabad GPS HARYANA NTPC Reserve Shutdown :30-7 Faridabad GPS HARYANA NTPC Reserve Shutdown :09-8 Faridabad GPS HARYANA NTPC Reserve Shutdown 6/8/2017 5:29-9 Obra TPS UP UPRVUNL R & M work 1/7/ :44-10 Bawana GPS DELHI DTL General maintenance :00 10/11/ Paricha TPS UP UPRVUNL R & M Work 2/7/ :30 1/7/ Guru Gobind Singh TPS (Ropar) Guru Gobind Singh TPS (Ropar) PUNJAB PSEB Reserve Shutdown :15 - PUNJAB PSEB Reserve Shutdown 12/7/ :35 -

68 SL. No Station Location Owner Unit No Capacity Reason(s) 1 RAPS-A RAJASTHAN NPC Subject to regulatory clearance Outage Date Time Expected Revival Date 9/10/ :58-2 Badarpur TPS DELHI NTPC Badarpur TPS DELHI NTPC Badarpur TPS DELHI NTPC Bhakra-L HPS HP BBMB Order of NGT for Environmental protection Order of NGT for Environmental protection Order of NGT for Environmental protection Replacement of Generator Shaft :29-9/10/2015 1: :30-1/4/2016 9: Faridabad GPS HARYANA NTPC Reserve Shutdown :30-7 Faridabad GPS HARYANA NTPC Reserve Shutdown :09-8 Faridabad GPS HARYANA NTPC Reserve Shutdown 6/8/2017 5:29-9 Obra TPS UP UPRVUNL R & M work 1/7/ :44-10 Bawana GPS DELHI DTL General maintenance :00 10/11/ Paricha TPS UP UPRVUNL R & M Work 2/7/ :30 1/7/ Guru Gobind Singh TPS (Ropar) Guru Gobind Singh TPS (Ropar) PUNJAB PSEB Reserve Shutdown :15 - PUNJAB PSEB Reserve Shutdown 12/7/ :35 -

69 ANNEXURE 2C

70

71

72 ANNEXURE 2D

73 ANNEXURE 2D

74 ANNEXURE 2D

75 ANNEXURE 2D

76 ANNEXURE 2D

77 Annexure 2 E... (STOA) (Intra) (DA) (Contingency) (FCFS) (AD)... (STOA) (Inter) (DA) (Contingency) (FCFS) 23 (AD)

78 ... (STOA) (DA) (Contingency) (FCFS) (AD)... (STOA) (DA) (Contingency) (FCFS) (AD)

79 Annexure 4 State Anticipated Peak Demand Expected Peak Availability November, 2017 Surplus (+)/ Deficit (-) Anticipated Energy Requiremen t Expected Energy Availability Surplus (+)/ Deficit (-) (MW) (MW) (MW) % (MU/day) (MU/day) (MU/day ) % Chandigarh Delhi Haryana H.P J&K Punjab Rajasthan U.P Uttarakhan d Region

80 PROPOSED 220KV NETWORK FROM 765KV BHIWANI PGCIL 765 KV BHIWANI (PGCIL) D/CKT D/CKT 220KV BHIWANI DOC KV ISHARWAL DOC

81 PROPSED 220KV NETWORK FROM 800KV HVDC BHADSON PGCIL 800 KV HVDC BHADSON (KKR) PGCIL 220KV PEHOWA 220KV Pehowa-Kaul line 220KV Kaul DOC KV Pehowa-Kaul line Loop OUT D.O.C (Loop IN) 220KV Bastara-Kaul line (Loop IN) 220KV Bastara DOC KV Bastara-Kaul line (Loop IN)

82 PROPOSED 220KV NETWORK FROM 400KV KHATKAR (JIND) PGCIL 400KV KHATKAR (JIND) (PGCIL) D/CKT D/CKT 220KV ISHARWAL DOC KV MUND DOC

83

84

85 765kV Agra Gwalior D/C line SPS Troubleshooting Before mock testing dated

86 SPS Operation Logic 765 kv Agra Gwalior D/C Line

87 Case 1 (Condition 1): When both 765kV Agra- Gwalior lines are in service, steady state flow crosses 3600MW total (West to North) for more than 10 seconds, shed loads of group C and D Total Steady state load flow>3600mw From West to North Gwalior 1 Line is in Service (Taken via status of Bay equipment and import Load Flow above a threshold i.e. Digital & Analog logic) & On delay Timer 10 sec Shed Load via Group C&D Gwalior 2 Line is in Service (Taken via status of Bay equipment and import Load Flow above a threshold i.e. Digital & Analog logic)

88 Case 1 (Condition 2): When only one 765kV Agra- Gwalior line is in service, steady state flow crosses 2500MW total (West to North) for more than 10 seconds, shed loads of group C and D Total Steady state load flow>2500mw From West to North Gwalior 1 Line is in Service (Analog & Digital logic) Gwalior 2 Line is out of Service (Analog & Digital logic) & & On delay Timer 10 sec Shed Load via Group C&D OR Gwalior 1 Line is out of Service (Analog & Digital logic) Gwalior 2 Line is in Service (Analog & Digital logic) &

89 Case 1 (Condition 3): When Agra 400kV Bus Voltage falling below 380kV for 10 seconds, direction of power flow is from west to north, shed loads of group C and D Load Flow from West to North (Analog Logic) Bus 1 Voltage >50kV & <380kV Bus 2 Voltage >50kV & <380kV & Both Bus in Service Load Flow from West to North (Analog Logic) Only Bus 2 in Service Bus 1 Voltage <50kV Bus 2 Voltage >50kV & <380kV & OR On delay Timer 10 sec Shed Load via Group C&D Load Flow from West to North (Analog Logic) Only Bus 1 in Service Bus 1 Voltage >50kV & <380kV & Bus 2 Voltage <50kV

90 Case 1 (Condition 4): Sudden reduction of import from WR to NR by more than 1000MW and less than 1500MW, shed loads of group C and D Power Flow in Gwalior 1 Line Power Flow in Gwalior 2 Line Σ Reduction in Power Flow (Import from West) >1000MW Shed Load via Group C&D <1500MW

91 Case 2 (Condition 5): Sudden reduction of import from WR to NR by more than 1500MW, shed loads of group C, D, E & F and generation backdown in WR by 500MW Power Flow in Gwalior 1 Line Power Flow in Gwalior 2 Line Σ Generation Reduction in Power Flow (Import from West) >1500MW Shed Load via Group C, D, E & F Backdown in WR 500MW

92 Modifications done on

93 1. Line In Service (Analog Logic) Applicable for Condition 1 & 2 Earlier a MW threshold of 5MW per line was set for checking line in service condition. Same has been modified to 50MW per line to make the logic more rugged PLC counts were changed accordingly For both the line s analog logic

94

95 2. Import from WR to NR (Analog Logic) Applicable for Condition 3 Earlier a MW threshold of 10MW was set for checking import from WR to NR (Both lines combined) Same has been modified to 100MW to make the logic more rugged PLC counts were changed accordingly

96

97 3. Load throw off logic change Applicable for Condition 4&5 The combined load of lines is added and stored in PLC registers Earlier, consecutive registers were being compared for calculating MW_DIFF value for assessment of load throw off condition (Condition 4 or 5) PLC stores samples per 800msec (set after iterative testing)- should be more than the response time of transducers Change in combined MW was calculated every 800msec

98 3. Load throw off logic change contd If the load throw off takes time more than 800msec, the condition may go undetected

99 3. Load throw off logic change contd The logic has now been modified and the MW DIFF is calculated between 1 st and 10 th register (not the adjacent one) This ensures the OLD MW value remains in 10 th register for approximately 7.2 seconds (800msec x 09 cycles) The MW DIFF calculations keeps on repeating every 800msec for checking the difference between CURRENT MW and OLD MW This ensures detection of both the load throw off conditions as detailed further

100

101 3. Load throw off logic change contd If the load throw off is for Condition 04 (i.e. Case 01): The lesser MW DIFF value shall not cause any logic operation and be immaterial The actual value in subsequent cycle shall operate Case 01 Detailed further in table

102 3. Load throw off logic change contd If the load throw off is for Condition 05 (i.e. Case 02): The lesser value of any cycle may fall in the range of MW DIFF of Condition 04 and sometimes Case 01 may also operate, prior to Case 02 When the load throw off has been completely reflected into PLC via transducers, the Case 02 shall consequently operate in subsequent cycle A deliberate tradeoff between unknown response time of the transducers and our need of operation of all the conditions (Operation of Case 01 also in condition of Case 02) Detailed further in table

103 Load Throw off from 2500 MW to 1200 MW i.e. Of 1300MW (Condition 4) Cycle 1 Cycle 2 Cycle 3 Register no. Value Value Value MW DIFF Condition None None Condition 4 Load Throw off from 2500 MW to 700 MW i.e. of 1800MW (Condition 4) Cycle 1 Cycle 2 Cycle 3 Cycle 4 Register no. Value Value Value Value MW DIFF Condition None None Condition 4 Condition 5

104 Thank you for your time!

105

106 IMPLEMENTATION OF FRAMEWORK ON RENEWABLES AT STATE LEVEL (IFRSL) OF NORTHERN REGION Date: Venue: NRPC Secretariat, New Delhi