Central Electricity Authority

Baart sarkar Government of India kond`iya ivavut p`aiqakrna Central Electricity Authority piscama xao~iya ivavut saimait Western Regional Power Committee ef -3, emaaayadisai xao~, AMQaorI (puva-), maumba[- - 400 093 F-3, MIDC Area, Andheri (East), Mumbai - 400 093 Aa[- esa Aao : 9001-2008 ISO: 9001-2008 durbaaya Phone: 022-28221681; 28250004; 28200195; fo@sa Fax : 022 28370193 Website : www.wrpc.gov.in E-mail:prc-wrpc@nic.in, protectionwrpc@gmail.com No. : WRPC/Protection/120 PCM/2014/1469 Date: 13.02.2014 To As per list, Sub: Minutes of 120 th Protection Committee Meeting held on 09 th January, 2014 at Mumbai - reg. Sir, Please find an enclosed herewith Minutes of 120 th Protection Committee Meeting held on 09 th of January, 2014 at WRLDC, Mumbai, Maharashtra. This is for your information and necessary action. The same is uploaded at www.wrpc.nic.in (in news and PCM minutes) Yours faithfully, Sd/- Satyanarayan. S O. P. Singh Superintending Engineer (Protection) Encl.: As above

Mailing list 1) Chief Engineer (LD), MSETCL, Kalwa. Fax-27601769/65 2) Chief Engr. (Trans O&M), MSETCL, Bandra. Fax No. 022-26590808/26598587. 3) CE (W), MSEGCL, 3rd floor, Prakash gad, Mumbai. 4) S.E. (T&C), MSETCL, Aurangabad Fax-0240-2234220 /2346290 5) S.E (T&C), MSETCL, Pune. Fax-9520-2617532/2612342 6) Dy. CE (T&C), MSETCL, Koradi, Nagpur. Fax- 07109-262162 7) S.E.(T&C), MSETCL, Nasik Road Fax-0253-2462422 8) S.E.(T&C), MSETCL, Vashi Fax- 022-27656039 9) S.E.(Testing), Bhusawal, Jalgaon Fax-95253-2810496/2810499 10) S.E. (Task Force), MSPGCL, Nagpur Fax- 0712-2591717. 11) S.E.(TCC), MSETCL, Karad. Fax.No. 02164 255118 12) Chief Engineer (Gen), GSECL, H.O. Baroda. Fax-0265-5512129/2344537 13) S.E. (Testing), GETCO, Baroda. Fax-0265-2351218 14) Chief Engineer (LD), MPPTCL, Jabalpur, Fax - 0761-2664343 / 2970119. 15) E.D. (T&C), MPPTCL, Jabalpur. Fax-0761-2702710 16) ED (Engg.) MPPGCL, Jabalpur Fax- 0761-2660063 17) Chief Engineer (LD), CSPTCL, Raipur. Fax-0771-2574174 18) C.E. (T&C), CSPTCL, Raipur.Fax-0771-2574749 19) EE (T), CSPGCL- Fax.No. 07789-226227 20) S.E. (T&C), CSPTCL, Bhilai. Fax.No. 0788-2281561 21) S.E. (T&C), CSPTCL, Raipur. Fax No.0771-2574749. 22) EE, Division VIII (MRT),Elect. Dept; Goa Fax 0832-2735124. 23) Supdt. Engr., Electricity Dept., DNH, Silvasa. Fax : 0260-2642338 24) Executive Engr., Electricity Dept. DD. Fax: 0260-2250889 25) D.G.M. (O.S. ),N.T.P.C., Mumbai, Fax- 28216692 26) DGM, NTPC WR II, Raipur, Fax: 0771-2544550 27) D.G.M. (EM), KSTPS, NTPC, Korba Fax 07759-233088 (Tele fax: 232440) 28) DGM (EMD), VSTPS, NTPC, Vindhyachal Fax-07805-247713 29) DGM (EM-I), NTPC, SIPAT Fax-07752-246506 (Tele fax: 246691) 30) AGM (O&M), KGPP, Adityanagar, Surat Fax 0261-2861428/2861433 31) Sr.Supdt. (EM), Gandhar, NTPC Fax-02642-87402 / 87450 32) DGM (O.S.), WRLDC, Mumbai Fax-28235434 33) DGM, WRTS-I, POWERGRID, Nagpur, Fax- 0712-2631051 / 641366 34) AGM, WRTS-II, POWERGRID, Baroda Fax-0265-2480952 (Tele fax: 2487542) 35) SME (E), TAPS-3&4,Tarapur Fax 02525-282001/282073 36) Maintenance Superintendant, TAPS 1 & 2, Tarapur.Fax- 02525-282121 37) SME(E), NPCIL, Kakrapara Fax 02626-234266 38) GM (Maint.). TORRENT Power., Ahmedabad.Fax-079-27506679 39) AGM (QAIT), TPC, Trombay. Fax 022-66687088 40) Asst. VP, Dahanu TPS Fax- 952528-222576 / 222039 41) GM (O & M), Reliance Infrastructure Limited, Mumbai Fax-30094488 42) GM (Electrical), JPL, Raigarh, Fax. No. 7767-281995, 281993. 43) AGM (OS), NSPCL, New Delhi. Fax.No.011 26717381/26717363/26717366 44) Vice President, APL, Ahmedabad 079-25557176 45) GM, RGPPL, Anjanwel, Guhagar, Ratnagiri, Fax.No. 02359 241071 46) GM, JSW Energy Ltd., Jindal Mansion, Mumbai- Fax.No.022 23526400 47) GM, CGPL, Mundra Fax.No. 02838 661188 48) Director (G M Division), CEA, New Delhi. Fax.No.011-26109750

MINUTES OF THE 120 th PROTECTION COMMITTEE MEETING OF WRPC 09.01.2014 AT MUMBAI. HELD ON The 120 th meeting of the Protection sub-committee was held at WRLDC, Mumbai on 09.01.2014. The list of participant is enclosed at Annex-1. Shri S D Taksande, MS (I/C), WRPC welcomed the participants of the meeting. He informed that SR grid was synchronized with NEW grid on 31.12.2013 at 20:25 Hrs and was personally present at control room of WRLDC during the process of synchronization along with Shri. Satyanarayan S (SE), WRPC. He thanked and congratulated all the constituents of WR for their consistent cooperation within a short period of time and appreciated the efforts made by one and all for this landmark achievement. The task of preparing the SPS schemes required to be in place before synchronization of SR with NEW grid was entrusted to NLDC by Member GO&D, CEA. Accordingly the SPS was put into service by all the concerned utilities even though there were concerns by some of the utilities. These concerns would be taken up with NLDC after detailed deliberations on these schemes and hoped that NLDC would review the SPS and modify the same. He requested SE (P), WRPC to take up the agenda for discussion. ITEM NO.1: CONFIRMATION OF MINUTES OF 119 th PROTECTION COMMITTEE MEETING SE (P), WRPC stated that the minutes of 119 th PCM, held 04.09.2013 at TAPS 3&4 Tarapur were circulated vide WRPC letter No. WRPC/Protection/119 PCM/2013-14/10195 dated 30.09.2013 and no comments have been received. The MoM circulated vide above letter was confirmed without any modifications. ITEM NO. 2: 2.1 Events of occurrence in MPPTCL 2.1.1 Occurrence at 220 kv on 30.07.2013 at Annupur S/s: MPPTCL representative informed that on 30.07.2013 at 21:46 Hrs Y phase CT of 132 kv Annupur Rajmilan I got burst and created bus fault at 132 kv bus of Annupur S/s. This resulted in tripping of all feeders / Transformers connected to 132 kv Annupur bus from remote end in zone II. This led to overloading of 220/132 kv 63 MVA ATF and the same tripped on O/C. During this event 132 kv supply failed at ATPS, Kotma, Shahdol, Dindori and HJIM. The total load loss during this event was 35 MWHrs. All elements (except 132 kv Rajmilan- Annupur I) were restored by 23:10 Hrs on 30.07.2013 and CT was replaced on 04.09.2013 (enclosed at Annexure -2.1.1). Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 1

Committee felt that trippings of lines from remote ends was in order. 2.1.2 Occurrence on 03.08.2013 at 220 kv Malanpur S/s: MPPTCL representative informed that on 03.08.2013 at around 22:20 Hrs, fault occurred on 132 kv Malnpur Ambha radial feeder, but due to mechanical problem, CB did not operate and therefore the fault was not isolated. All the other lines / ICT connected to Malanpur 132 kv tripped on backup protection. Power supply was interrupted to 132 kv Ambah, Morar, Banmore, Motijheel and Morena sub stations. After rectifying the mechanical problem (SF 6 Pressure) in the breaker of the 132 kv Malnpur Ambha, all lines / ICTs were restored by 02:05 Hrs on 04.08.2013 (enclosed at Annexure -2.1.2). Committee recommended utilities to carry out periodical maintenance of equipment and ascertain that all the parameters are within permissible limits. 2.1.3 Occurrence at 220 kv Shivpuri S/S on 16.08.2013: MPPTCL representative informed that on 16.08.2013 at 17: 58 Hrs a flash over occurred on isolator of 132 kv Shivpuri - Kolaras radial feeder, creating a bus fault on 132kV Bus. All the 132 kv source feeders tripped on E/F from remote ends and the 220 kv feeders tripped from remote end on zone III. During this, power supply was interrupted to 220 kv Shivapuri S/s & 132 kv Kolaras S/s and complete supply failed to 132 kv Shivpuri. 220 kv and 132 kv systems were normalized by 18:35 Hrs. He further informed that the backup protection settings of 160 MVA transformer was on higher side and therefore resulted in tripping of 220 kv lines from remote ends. The backup protection settings of 160MVA T/F were revised (enclosed at Annexure -2.1.3). Committee observed that the remote end trips were undesirable and these have occurred due to improper co-ordination of the settings. 2.1.4 Occurrence at ATPS Chachai on 22.08.2013: MPPTCL intimated that on 22.08.2013 at 12:40 Hrs, at 132 kv Chachai S/s B phase bushing of ATF got burst and also damaged R & Y phase bushings. Following this ATPS Annupur I was tripped from ATPS, but ATPS Annupur II was not tripped. As the ATPS Annupur II was not tripped, the fault was fed to 132/220 kv TF, hence tripped and remaining feeders connected to 132 kv ATPS, Chachai were hand tripped. This led to loss of power supply to Shahdol, Kotma and Dindori sub-stations (Annexure -2.1.4). The total load loss during the event was 73 MWHrs. Committee felt that, it is desirable that ATPS Annupur I & II should have tripped from 220 kv Annupur S/s, but shouldn t have tripped from 132 kv ATPS. All feeders were restored by 14:15 Hrs. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 2

2.1.5 Occurrence at Omkareshwar HPS on 02.09.2013: WRLDC representative intimated that on 02.09.2013 at 13: 47 Hrs, 220 kv Itarsi Barwaha was tripped on fault, following this at 13:49 Hrs OSP Barwaha was tripped on O/C. At 14:05 Hrs, while 220 kv Itarsi Barwaha line was charging, 220 kv OSP-Nimrani and 220 kv OSP- Chegaon line were tripped. As already OSP - Julwania and OSP - Kandwa were kept open to control the high voltage, there were no lines to evacuate power from OSP, all the Eight Units of OSP tripped on over frequency leading to loss of 390 MWs generation (Annexure - 2.1.5). All elements were restored by 16:29 Hrs. Committee felt that lines, OSP Julwania and OSP Kandwa have been taken into service after tripping of OSP Barwaha on O/C. 2.1.6 Occurrence at 220 kv Omkareswar HPS on 21.09.2013: MPPTCL intimated that on 21.09.2013 at 13:02 Hrs 220 kv OSP Nimrani, OSP Barwaha, OSP-Chhegaon and OSP Kandwa lines were tripped on O/V, led to tripping of Unit 4 & 6. This occurrence caused total loss of generation of 99 MWs (Annexure -2.1.6). All elements were restored by 16:43 Hrs. Committee noted that the tripping was in order. 2.1.7 Occurrence at 400 kv Indore S/s on 30.09.2013: MPPTCL representative informed that on 30.09.2013 at 18:24 hrs 400 kv Indore ISP was taken back into service after routine shut down, followed by normalization of Bus bar protection at 18:32 Hrs. During normalization of Bus bar protection, the busbar protection of 400 kv main bus II operated due to non operation of CT selection switchover relay. Hence bus coupler, two interconnecting transformers, 400 kv Indore Itarsi II and 400 kv Indore Asoj II got tripped but 400 kv Indore ISP I and 400 kv Indore Indore (PG) did not trip. During this incident there was no load loss. MPPTCL representative further stated that the CT switch over scheme is manual and the same is under replacement with numerical CT switching relay. The Bus bar protection scheme was installed in 1984 and CT circuit open bocking of the BB protection did not operate. The BB protection Main and Check zone operated because of differential current due to non-operation of the CT change over switch and CT ckt Open blocking feature. The BB protection has never operated for through faults in the past. The tripping links of 400 kv Indore ISP and 400 kv Indore Indore (PG) lines were isolated before normalization of bus bar protection and therefore these lines did not trip (enclosed at Annexure -2.1.7). Committee observed that due care should have been taken to ensure that all the associated components of the Bus bar protection are checked before taking into service to avoid such mal operations. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 3

2.1.8. Occurrence on 01.10.2013 at Malanpur S/s: MPPTCL representative informed that on 01.102013 at 16:30 Hrs 220 kv Malanpur Auriya tripped from Auriya end as its earth wire got broken and snapped but Malanpur end CB failed to operate. Thus the fault was fed from lines connected to the 220 kv Malanpur bus, which led to tripping of connected lines from remote ends. All lines were restored by 00:15 Hrs of 02.10.2013. The load loss due this occurrence was 128 MWHrs. MPPTCL representative informed that the faulty CB at Malanpur end of 220 kv Malnpur Auriya line was replaced. He further informed that the Bus Bar protection/lbb is not in service at Malanpur and new BB protection/lbb scheme is under procurement (enclosed at Annexure -2.1.8). Committee observed that LBB protection would have isolated fault earlier than the remote end trippings and MPPTCL was suggested to provide Bus bar/lbb protection at 220kV S/Ss. 2.1.9 Occurrence at 220 kv Badod S/s on 10.10.2013 MPPTCL representative informed that on 10.10.2013 at 20:04 Hrs R phase PT (Badod side) of 220 kv Badod Kota line failed, which was connected to main bus II. Metallic dome of PT and jumper came inside the zone of main bus I. This led to operation of bus bar protection on both buses. There was no loss of load/generation. All lines were restored by 21:54 Hrs. The failed PT was replaced on 11.10.2103 and 220 kv Badod Kota line was normalized at 21:09 Hrs on 11.10.2013 (enclosed at Annexure -2.1.9). Committee felt that the operation of Bus Bar protection was in order. 2.1.10 Occurrence on 16.10.2013 at ATPS Chachai: MPPTCL intimated that on 16.10.2013 at 11:10 Hrs earth ground wire of 220 kv Railway traction feeder I was broken and had fallen on ground, this led to E/F. The CB of faulty feeder didn t trip, resulted in fault fed to 220 kv ATPS. The lines / Units / transformers connected to this bus tripped. The unit 5 tripped on backup e/f protection and Unit 3 tripped on low forward power flow protection. The loss of generation was 270 MWs. All elements were restored by 05:27 Hrs on 17.10.2013 (Annexure -2.1.10). Committee felt that occurrence was in order. 2.1.11 Occurrence on 12.11.2013 at 220 kv Chhegaon S/s: MPPTCL representative informed that on 12.11.2013 at 08:58 Hrs, backup O/C relay of 220/132 kv, 160 MVA TF I operated, led to tripping of the transformer. This resulted in over loading of 220/132 kv, 160 MVA TF-II, hence it tripped. Prior to the occurrence, other source feeders 132 kv Chhegaon Barwaha & Barwaha Sanawad were already kept open for load management, thus 132 kv Chhegaon bus become dead. This occurrence led to total load loss of 34 MWHr. He further informed that the backup O/C relay operated while opening 132 kv Chehgaon Bharwaha line due to jerk of load shifting. The over current setting adopted for the 160MVA T/F-I was Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 4

420 Amps and load on the T/F was around 400Amps. The O/C relay was found defective during subsequent testing, the same was replaced immediately i.e. 12.11.2013 and system was normalized within 10 minutes i.e. 09:08 Hrs (enclosed at Annexure -2.1.11). Committee observed that the operation of O/C relay was a boundary case. 2.1.12 Occurrence on 18.11.2013 at Nagda S/s: MPPTCL representative informed that on 18.11.2013 at 07:09 Hrs., 400 kv Nagda Rajgarh Ckt I was charged from 400 kv Nagda S/s end, while synchronizing it from 400 kv Rajgarh (PGCIL) S/s end, Bus Bar Protection of 400 kv Main Bus I, Nagda mal-operated and resulted in tripping of elements connected 400 kv Main Bus -I. The 400kV Nagda-Sujalpur Ckt-I tripped from both ends on DT sent which may be due to spurious signal. During this, though 400 kv main bus I become dead, load was managed by ICTs connected through tie breaker. Meanwhile, at around 07:26 Hrs, 220 kv Jaitpura Indore II tripped on E/F from Jaitpura end, due to broken jumper of R phase wave trap. This led to over loading of other lines, resulted in cascading tripping of many lines. The SPS stage 1 operated, however the load relief was not adequate. The 2 nd stage of SPS did not operate since it is designed to shed the load on O/C & Master Trip operation. The total load loss was 1195 MWs at Nagda and nearby Areas (Annexure -2.1.12). All lines were restored by 11:30 hrs. MPPTCL representative further informed that the issue of mal-operation of ABB make numerical BB relay was taken up with M/s ABB. However feedback from M/s ABB is awaited and the BB scheme has been kept out of service. Committee observed that the BB protection is a mal operation. 2.2 Events of occurrence in MSETCL 2.2.1 Occurrence on 23.08.2013 at 400/220 kv Padghe S/s: MSETCL representative stated that on 23.08.2013 at 16:19 Hrs, 400 kv Padghe Padghe HVDC II Line LBB relay operated at 400 kv Padghe s/s resulting in tripping of all the 400kV Lines & equipment connected to 400 kv Main- Bus-II. HVDC Pole-I was out for maintenance. Testing was undertaken for TRP-100 protection meant for converter T/F & Filter bus differential protection. The relay was successfully tested for Trip-A by blocking Trip-B. All the breakers were closed and Trip-B testing was undertaken by blocking Trip-A, after extending the Trip-B command, LBB of Bus-II operated, resulting in tripping all the elements connected to Main Bus-II. On detailed checking of LBB relay inspection in 400kV HVDC-II relay panel, it was found that the output contact of Y-phase current element of LBB relay was found permanently shorted, resulted in already enabled LBB current logic even though there was no current in the line CT. On receipt of the Trip-B Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 5

circuit the Group-B main trip relay on 400kV HVDC-II operated. This resulted into loss of load to the tune of 32 MW on 220kV and 22 kv level (Annexure -2.2.1). All lines were restored by 17:12 Hrs on 23.08.2013. Committee felt that during testing due care should have been taken while carrying out preliminary inspection of all the elements associated with the protection being tested. 2.2.2 Occurrence at 400 kv Jejuri S/s, Maharashtra on 24.08.2013: MSETCL representative stated that on 24.08.2013 at 05:56, 400 kv Lonikhand - Jejuri Line tripped on R phase to earth fault on Zone 1 Distance Protection operation. It was followed by tripping of 400 kv Jejuri-Koyna IV from Koyna IV end on over-voltage. This led to over loading of 220 kv Kandalgaon- Lonand circuit, which was tripped from Kandalgaon on O/C protection. Thus all three feeding sources of Jejuri were tripped, led to Zero power at 400/220 kv Jejuri, 220/33 kv Jejuri, Lonand and other radially connected sub-stations and loads. The total load loss during this event was about 577 MWs. All elements were restored by 18:30 Hrs (Annexure -2.2.2). Committee felt that the tripping was in order. 2.2.3. Occurrence at 220KV Amalner S/s on 15.09.2013: MSETCL intimated that on 15.09.2013 at 23:28 Hrs, R ph CT of 220KV Amalner - Deepnagar line got burst, resulted into operation Bus Bar operation, led to tripping of all feeders connected to it (Annexure -2.2.3). Committee felt that the occurrence was in order. 2.2.4 Occurrence at Nasik (Eklahare) GCR and OCR S/s on 18.09.2013: WRLDC intimated that on 18.09.2013 at 07.12 Hrs, R Phase CT of 220 kv Bus section I on Nasik GCR Side burst, resulted in operation of 220 kv Zone-A and Zone-B Bus bar protection at 220 kv Nasik GCR S/s and Bus bar protection at 220 kv Nasik OCR S/s. This has resulted in tripping of all 220 kv lines and ICTs connected to Zone A, Zone-B at 220 kv Nasik GCR S/s and all 220 kv lines and ICTs connected to 200 kv Bus of 220 kv Nasik OCR S/S. During this, Nasik Unit 5 also tripped at GCR due to loss of station supply, which was in Zone C. During the event, load loss of around 300 MW occurred along with generation loss of 428 MWs and load loss of 300 MWs (Annexure -2.2.4). Committee felt that the occurrence was in order. 2.2.5 Occurrence at 400 kv Babaleswar S/s on 20.09.2013: MSETCL intimated that on 20.09.2013 at 01:21 Hrs, jumper of B phase insulator of 220 kv Babaleswar - Alephata (connected to 220 kv Main Bus II) drop downed between 29A & 29B isolators, led to flash over. Hence, on Busbar protection operation all lines and ICTs connected to 220 kv main bus II were tripped. All Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 6

elements were restored on Bus I by 03:29 Hrs and shifted to Bus II 15:07 Hrs (Annexure -2.2.5). There was no load loss during the occurrence. Committee felt that the tripping was in order. 2.2.6 Occurrence at 400/220 kv Deepnagar S/s, on 01.10.2013: WRLDC intimated that, on 01.10.2013 at 03:45 Hrs, B phase CT of Station transformer 4B (400 kv Main Bus I) got busted, this led to operation of Bus bar protection. The oil of CT spread upto R phase CT of GT5, resulted operation of differential protection of GT5, thus Unit 5 has tripped. As during this occurrence as the voltage dipped, the auxiliary supply to GT4 got failed, thus Unit 4 tripped. During this event, the total generation loss was 458 MW (Annexure -2.2.6). Committee recommended the utilities to monitor CTs closely and do preventive maintenance. 2.2.7. Occurrence at 400/220 kv Chandrapur TPS on 27.10.2013: On 27.10.2013 at 10:50 Hrs, while taking out unit 7 of Chandrapur (which was connected to main Bus I), CB of GT 7 did not operate. Due to this, LBB of GT-7 operated, resulting in tripping of all the elements connected to Bus I including Unit 3 and ST-4. Though Unit 6 was connected to Main Bus II, as its auxiliaries were fed from ST-4, it got tripped on auxiliary failure. As 400 kv Chandrapur Chandrapur II (which was connected to Bus I) tripped, overvoltage appeared at Chandrapur II, led to tripping of 400 kv Chandrapur-II Parli. This led to power re-routing and resulted in loading of Wardha flow gate and operation of its SPS, hence 84 MWs backing down at APML, Tirora. At 10:51 Hrs HVDC pole -1 was tripped on Main Circuit flow valve cooling alarm from Chandrapur end (Annexure -2.2.7). GT-7 was already taken out at 09:01 hrs in the morning on BTL. Master trip relay has operted for GT-7. So, the Circuit breaker were in open condition while the isolaters were in closed condition. At 10:51 the LBB protection operated resulting in outage of all 400 kv Bus 1 elements. It was found that LBB of GT-7 has operated from PCR end. Further investigation was done to find out the exact reason why the LBB operated. The CT secondary Core 2 (used for LBB protection) whcih is laid from CTMB at GCR switchyard to Relay panel at PCR end was having zero IR value. Insulation Resistance of R phase wire was found to be zero ohm and spark was observed when earthed even after isolating from both ends. This seems to be the reason for operation of LBB protection of GT-7. The same wire was replaced with a new one and IR value were found to be ok. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 7

It was also found that, after the withdrawal of GT-7 on BTL and Master trip relay operation, it was not reset at PCR end. The Bus -1 isolator of the same was in closed condition. IF the MTR relay would have been in reset condition from PCR end immediately after GT-7 withdarawal, the event could have been avoided. MSPGCL may take proper action for resetting of MTR after withdrawal of unit to avoid any future occurrences. Committee felt that due to non-resetting of the relay and damaged cable, LBB has operated and resulted in the disturbance and suggested MSPGCL to carry out the O & M activities and testing at regular intervals. 2.2.8 Occurrence at 220 kv Chalisgaon S/s on 13.11.2013: MSETCL intimated that on 13.11.2013 at 21:02 Hrs at 220 kv Chalisgaon S/s, CT of R phase of 132 kv Chalisgaon - CSN II got busted and also damaged nearby 132KV breaker, isolators & Y phase CT porcelain insulation. This led to operation of 132KV Busbar relay along with 132KV line differential relay of 132KV CSN Ckt-II. The 132 kv Chalisgaon - CSN II was restored by 13:58 Hrs on 14.11.2013 and all other lines were restored by 21:38 Hrs on 13.11.2013 (Annexure -2.2.8). The committee felt that the Victrans make CTs has no Tan δ measuring point. Tan delta values of CT are in GST mode. In such conditions monitoring of CTs is difficult. Hence if such CTs are provided at some critical locations (as 132KV Bus at 220KV and 400KV s/s, ICT I/C and Generation attached s/s etc.) they needs replacement on priority. 2.2.9. Occurrences at Chandrapur: The occurrences in Chandrapur area of Maharastra system were minor trippings, hence enclosed at annexure -3. 2.3 Events of occurrence in CSPTCL 2.3.1 Occurrence at JPL S/s on 06.09.2013: On 06.09.2013 at 02:06:01.160 Hrs,, 400 kv JPL-Raipur I tripped on R-phase to earth fault, A/R operated from both ends. However, at 02:06:02.400 JPL Raipur I again tripped as fault was permanent in nature. Due to tripping of this line, SPS of Jindal operated leading to tripping of Unit 2 and generation reduction of other units by 90 MWs. At 02:44 Hrs, line was trial charged from Jindal end and due to permanent nature of fault, SOTF trip was issued at JPL end, but tripped after 500 ms. As a result, the fault was fed through 400 kv JPL Raipur II and it tripped. Due to loss of both evacuation lines, all running three units (1, 3, & 4) tripped, resulting in loss of 610 MWs generation (Annexure -2.3.1). At 03:02 Hrs, 400kV JPL-Raipur II was charged from Raipur end and supply was extended to JPL Units. Unit 1 was synchronized at 07:28 Hrs while Unit 2 at 07:35 Hrs. later Unit 3 was 8 Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai

synchronized at 09:25 Hrs. After inspection of 400 kv JPL-Raipur 1 it was found that R phase conductor of this line snapped at a location 15 km far from JPL. After the maintenance of this line, it was taken in service at 21:10 hrs. With both line in service, Unit 4 was synchronized at 00:11 hrs on 7 th September 13. The committee felt that, the fault during the above occurrence was persisted for almost 500 ms even after operation of SOTF relay at JPL end. In view of this, JPL was advised to immediately carryout the testing of DPS of 400 kv JPL Raipur II line. 2.3.2 Occurrence at 220/132 kv Korba (East) TPS on 22.10.2013: On 22.10.2013 around 10:03 Hrs. at 220 kv Korba (East) substation, the ground staff was instructed to open the isolator of 20 MVA ST-2 (which was out of service), instead they opened the R phase isolator of 20 MVA ST-1, which was connected to Bus -I. This led to heavy flashover and tripping of all lines/units connected to Bus I including Unit 1, 2 & 6. During this event Bango HPS also tripped which was connected to Korba (E) via Mopka. The total loss of generation was 183 MWs. All lines / units were restored by 15:55 Hrs (Annexure -2.3.2). The committee recommendedto install bus bar protection at Korba(East) sub-station. 2.3.3 Occurrence at Korba NTPC on 29.10.2103: On 29.10.2013 at 12:02 Hrs, A/R lockout occured for 400 kv Korba-Bhilai I which was on Bus II and its breaker got opened. This was followed by undesirable LBB initiation, which tripped all the elements connected with Bus II along with Bus coupler and bus sectionalizer. This led to tripping of Unit 2 & 4 connected to Bus II. The total generation loss during the occurrence was 714 MWs. All the elements were restored by 18:10 Hrs (Annexure - 2.3.3). The committee felt that, operation of LBB is undesirable and requested NTPC to check the healthiness of the same. 2.3.4 Occurrence on 30.10.2013 at JPL: On 30.10.2013 at 17:07 Hrs, 1500 MVA 765/400 kv ICT was charged through 400 kv JPL -Tamnar 4 line from PGCIL Tamnar end, after revision of the relay setting of ICT for backup earth fault. But it couldn t hold and ICT tripped immediately on E/F, during this tripping, a heavy dip in the system voltage was observed, which caused tripping of auxiliaries and initiation of protection elements in GRP relays of 250 MW units. At 17:36 Hrs, second trial was attempted, but resulted in tripping of JPL 250 MW Units-1 and 2 on backup earth fault. During this total generation loss was 504 MWs. All elements were restored by 19: 50Hrs (Annexure -2.3.4). Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 9

WRLDC representative stated that on both occasions there was a heavy voltage dip observed in the bus voltage at Raipur as seen in the recordings of PMU data. WRLDC further intimated that PGCIL was suggested not to test charge ICT, however PGCIL test charged the ICT without consulting WRLDC. Committee suggested PGCIL to test the ICT for healthiness and follow instructions of WRLDC. 2.4 Events of occurrence in GETCO 2.4.1 Occurrence on 31.08.2013 at 400/220 kv Jetpur: On 31.08.2013 at 11:45 Hrs, heavy sparking was observed on 400 kv Bus I, Y Phase Bus L type contact at 400/220 kv Jetpur S/s. Immediately Bus coupler was hand tripped from the sub-station to isolate Bus I and Bus II in order to avoid bus fault. This led to two ICTs on Bus I without any source feeder. The third ICT connected to Bus II tripped on overcurrent protection due to overload. This resulted in load loss of around 1295 MWs and generation loss of 145 MWs (Annexure -2.4.1). At 10:13 Hrs 400 kv Jetpur Mundra II was taken out under emergency shutdown for insulator replacement work, as a result around 520 MWs power was flowing through the bus coupler from 400 kv Bus I to 400 kv Bus II at Jetpur substation.. Committee noted the same. 2.4.2 Occurrence on 10.09.2013 at 400/220 kv Amreli S/s: On 10.09.2013 at 00:52 Hrs, 400/220 kv 315 MVA Amreli ICT I & II tripped on overload (The reasons for over loading may be due to increase in agriculture load as it is off-monsoon period and the wind generation had fallen drastically, led to power flow through Jetpur & Amreli). This led to loss of load at Amreli, Savarkundala, Timbdi, Dhokadva, Dhasa and nearby area in Gujarat. The total load loss during the incident was 509 MWs. All elements were restored by 01:15 Hrs (Annexure -2.4.2). The committee felt that the occurrence was in order. 2.5 Events of occurrence at HVDC Bhadravathi 2.5.1 Occurrence at HVDC Bhadrawati S/s on 19.08.2013: On 19.08.2013 at 22:43 Hrs, due to the fault on LT cable of VCC-2, the supply switched over to redundant supply. During this, control circuit of Pump-1 malfunctioned which led to failure in switching over from half speed mode to full speed mode and got tripped. Thus HVDC Bhadravati Back to Back pole-2 tripped at 22:44 Hrs on VCC 2 Main half flow Very low alarm. The element was restored by 22:52Hrs. During this event, total load loss was 477 MWs (Annexure -2.5.1). Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 10

Committee felt that half speed / full speed run change over relay might be mal-operated and asked PGCIL to check its operation and replace if required. 2.5.2 Occurrence at HVDC Bhadrawati on 01.10.2013: On 01.10.2013 at 15:50 Hrs auxiliary supply feeders (33 kv) at Warora and MIDC Chandrapur were tripped. The DG -1 & DG -2 came into service in auto mode. After restoring 33 kv MIDC feeder, auto changeover command was given, to get power from 33 kv auxiliary supply feeder and successfully took place at 16:26 hrs. After change over, there were fluctuations in the auxiliary supply. Due to this, Valve (Thyristor) cooling pumps of pole-1 & 2 got tripped, resulted in tripping of Pole-1 & 2. This resulted in loss of 978 MWs power flow to Southern region. Both poles were restored by 16:41 Hrs (Annexure -2.5.2). Committee suggested that MSETCL may take up the matter with appropriate agencies (MSEDCL) to provide reliable 33 kv supply at this substation. 2.6: The status of compliance of recommendations of previous PCMs: The compliance status of recommendations of previous PCMs is enclosed at annexure 2.6. ITEM NO. 3: Tripping of lines / ICTs: The incidences of tripping of lines and ICTs during the period 01-08-2013 to 30-11-2013 are enclosed at Annexure 3. Committee noted the same. ITEM NO. 4: Status of implementation of recommendations of Report on Grid disturbance on 30 th and 31 st July 2012 in WR. The Status of implementation in WR on Recommendations of Report on Grid disturbance on 30 th and 31 st July 2012 as on 15.12.2013 is given at Annexure-4. In the 117 th PCM it was informed that CEA vide letter No. 6/AI/DST/GM-2013/441-449 dated 10.05.2013 has forwarded formats for collecting information of status of action taken on the recommendations of the Enquiry Committee. The updated status of implementation of various recommendations of the grid disturbance enquiry committee as on 1 st & 15 th of each month is required to be forwarded to CEA by RPCs by 3 rd & 17 th of every month regularly. 1) Information in Formats 1 to 3 is to be furnished by STU and CTU for month by 1 st and 15 th of the month. 2) Information in Format 4 is to be furnished by SLDCs/ WRLDC POSOCO for the month by 1 st and 15 th of the month. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 11

3) Information in Format 5, 7 & 8 is to be furnished by WRLDC POSOCO for the month by 1 st and 15 th of the month. 4) Information in Format 6 is to be furnished by CTU for the month by 1 st and 15 th of the month. In the 117 th PCM it was decided that the above information may please be forwarded through the nodal officer of the above organizations to WRPC. Nodal officers identified for submission of data were as follows; 1. WRLDC : Shri P.Pentayya GM WRLDC 2. PGCIL-I : DGM(OS) 3. PGCIL-II: DGM(OS) 4. NTPC WR-II : Shri D.Roychowdhari AGM(OS) & A.K.Chandelia DGM(OS) 5. GETCO STU : Shri S.A.Patel. 6. GETCO SLDC : Shri B.B.Mehta, CE SLDC. 7. MSETCL STU : Shri Rajurkar SE 8. MSETCL SLDC : CE SLDC 9. MPPTCL STU : Shri Jain, CE (T&C) 10. MPPTCL SLDC:Shri P.A.R Bende CE SLDC 11. CSPTCL STU:Shri Rehman SE(T&C) 12. CSPTCL SLDC: Shri K.S.Manotia CE SLDC. SE (P), WRPC pointed out that MP is submitting the reports regularly and asked other utilities also to submit the data in prescribed format in soft copy regularly. He also pointed out that utilities may submit data to nodal agency/officer, after compiling the data and nodal agency may submit it to the WRPC, as present form of data receiving has been become difficult. The constituents agreed for the same. ITEM NO. 5: Zone 3 settings of Distance Protection Schemes: Back Ground: CEA have issued Manual on Transmission Planning Criteria which is effective from 01.02.2013 (the same is available at CEA website). Under para 20 of the Manual on Transmission Planning Criteria, guidelines on zone-iii setting to avoid tripping of lines in extreme loading conditions has been given as follows Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 12

Quote 20 Guidelines for consideration of zone-3 settings 20.1 In some transmission lines, the Zone-3 relay setting may be such that it may trip under extreme loading condition. The transmission utilities should identify such relay settings and reset it at a value so that they do not trip at extreme loading of the line. For this purpose, the extreme loading may be taken as 120% of thermal current loading limit and assuming 0.9 per unit voltage (i.e. 360kV for 400kV system, 689kV for 765kV system). In case it is not practical to set the Zone-3 in the relay to take care of above, the transmission licensee/owner shall inform CEA, CTU/STU and RLDC/SLDC along with setting (primary impedance) value of the relay. Mitigating measures shall be taken at the earliest and till such time the permissible line loading for such lines would be the limit as calculated from relay impedance assuming 0.95 pu voltage, provided it is permitted by stability and voltage limit considerations as assessed through appropriate system studies. Unquote. In the 118 th PCM all the utilities confirmed that they have already taken care of the above load ability limits in deciding the Zone-3 settings. In the 119 th PCM, STUs were requested to furnish the data regarding Zone III settings in respect of intra-state lines requiring relay coordination with CTU network directly to CTU under intimation to WRPC. STUs confirmed that they would furnish the data to CTU. CTU representative said that the revised zone 3 distance protection settings of few interregional lines was not received from constituents. SE (P), WRPC stated that CTU may forward the list of lines to WR constituents and requested constituents to furnish the relevant data in this regard at the earliest. Committee noted the same. Item No 6: Testing of frequency controller and frequency limit function of HVDC back to back at Bhadravati The testing of frequency controller and frequency limit function of HVDC back to back at Bhadravati was facilitated on 22nd November 2013 between 1400 hrs to 1620hrs. POWERGRID have completed the testing on 22 nd Nov. 2013 from 14:22hrs to 16:20hrs. NLDC subsequently informed settings to be adapted at HVDC Bhadravati as WR Low: 48.5 Hz, WR High: 51.5 Hz, SR Low: 48.8 Hz and SR High: 51.2 Hz. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 13

Committee noted the same. Item No 7: Commissioning of new system protection scheme in connection with synchronization of SR and NEW grid The activities associated with the synchronization are being periodically monitored by the Central Electricity Authority and the Ministry of Power. Commissioning of certain identified System Protection Schemes is one of the prerequisites for synchronization. The details of the SPS to be implemented in Western Region and the actions to be taken by different utilities were elaborated vide WRPC letter WRPC/Protection/SPS/2013/2046 dated 29.11.2013 to all the concerned. Concerns were raised by the constituents of WR pertaining to overloading in Vapi-Boisar sections, Wardha and Raipur flow gate flows, voltage conditions in Solapur area and other prevalent conditions likely to change after the synchronization. Constituents opined that matters pertaining to the SPS, Bhadravati HVDC Frequency Controller settings etc. requires the involvement of NLDC in the discussion. Also, detailed discussion on various SPS schemes formulated by CEA/NLDC is required and constituents opined that immediately a separate meeting may be called involving representatives from NLDC, PGCIL, SLDCs, WRLDC, WRPC, constituents directly involved in SPS schemes such as DB power, JPL, APL Tiroda, IEPL etc. to sort out the concerns before the NEW grid is synchronized with SR. Accordingly, a meeting was held on 17.12.2013 at WRLDC. Minutes of the meeting held on 17.12.2013 are available on WRPC website. The additional SPS schemes have been formulated at JPL, KSK Mahandi, NTPC Mauda, APL Tiroda & DB Power. Details of the same were given in Annexure-2 of the above MoM. The testing of frequency controller and frequency limit function of HVDC back to back at Bhadravati was facilitated on 22nd November 2013 between 1400 hrs to 1620hrs. POWERGRID have completed the testing on 22 nd Nov. 2013 from 14:22hrs to 16:20hrs. NLDC subsequently informed settings to be adapted at HVDC Bhadravathi as WR Low: 48.5 Hz, WR High: 51.5 Hz, SR Low: 48.8 Hz and SR High: 51.2 Hz. All utilities extended their support in implementation of relevant SPS in short duration and helped the process of SR grid synchronization with NEW grid. JPL representative pointed out that SPS scheme has mal-operated twice and resulted in tripping of 660 MW Unit. He further stated that JPL is receiving only one signal which is used for 600 MWs back down at JPL. JPL representative also pointed out that though there are other generating stations in the nearby area, they were not considered for generation back-down for the said SPS. He also requested that all the Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 14

generators in the W-3 bid area needs to be considered for generation back-down in proportion to their installed capacity. It was informed that two separate signals are required to be extended to JPL one for backing down of 350MW and other for backing down of 600MW. PGCIL representative informed that at present only one signal is extended to JPL which is being used for backing down/tripping of 600MW generation at JPL. Protection sub-committee decided that tentatively till two separate signals are provided at JPL (one signal to initiate 350 MWs back down and other signal to initiate 600 MWs) end, JPL may back down by 350 MWs only. PGCIL was requested to extend two separate signals to JPL at the earliest and inform in TCC/WRPC meeting. It was also decided that review of existing SPS (NLDC) will be taken with NLDC. ITEM NO 8: IMPLEMENTATION STATUS OF SPS UNDER PROGRESS: 8.1.A) SPS for 765 kv Gwalior-Agra D/C (G eneration Run back Scheme in WR): An SPS was envisaged for ensuring backing down WR generation by 500 MW (VSTPS - 200 MW, KSTPS - 120 MW, CGPL - 180 MW) in case of sudden reduction of NR import from WR on Bina-Gwalior-Agra link by 1500 MW. PGCIL vide letter No WRTS-II/VDR/O&M/AA/250 dtd 25.11.2013 (copy enclosed at Annex.-8.1.A.1) have intimated that commissioning of DTPC at Mundra would be commissioned by first week of Dec- 13. At NTPC V chal, NTPC has to lay the additional cable and confirm for further action of shifting the communication equipment and commissioning of DTPC. The cable has already been dispatched to NTPC. At NTPC Korba STPS hardware connections has to be done. In the 454 th OCC held on 10.12.2013, CGPL representative intimated that preliminary testing had been carried out on 4th December, 2013 and final testing will be done on 27th December, 2013. NRPC vide letter NRPC/OPR/106/2012/992 dated 11.12.2013 (copy enclosed at Annex. -8.1.A.2) has requested to expedite the above work and commission the WR part of the SPS at the earliest. CGPL representative stated that they have made arrangement for the suitable generation backdown w.r.t. said SPS. NTPC representative stated that they have made arrangement for the suitable generation back-down at NTPC Korba and the same is under progress for NTPC Vindyachal and it will be completed by 10.01.2014. It was decided that once the entire scheme is made ready, it may be tested for its operation by PGCIL in supervision of WRLDC. It was suggested that WRLDC shall test the operation of SPS for reduced quantum s (say 50MW for each station) and not for backing down of entire 500MWs. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 15

8.1. B) SPS at APL Tiroda : A special meeting was convened by WRPC to review the SPS at APL Tiroda post synchronization of 400 kv Warora-Chandrapur-stg-II line on 18.11.2013. Following logic for SPS was accepted and same would be reviewed after commissioning of additional 400 kv line from Chandrapur-II to Warora & LILO of Parli-Chandrapur-II. 1 400kV Chandrapur- 1) SLDC Maharashtra may take appropriate manual actions Warora ckt in service (such as generation pickup at Koyna, RGPPL and Parli and control generation in Wardha pocket) to relive the congestion of the corridor and load shedding in Western Maharashtra as a last resort. 2) The short term schedules shall be curtailed in the event of crossing of the margins as per the regulatory frame work. 3) Since the sensitivity of APL Tiroda generation to the Wardha flow gate is significantly low in case of Warora Chandrapur ckt in service, therefore WRLDC would suggest the factor by which the generation of APL Tiroda is required to be backed down (if it is found that the effect of backing down of generation at APL Tiroda under such condition is effective in controlling the flow through Wardha flow gate) to control incremental flow on Wardha flow gate this additional set of logic will be incorporated. 2 400kV Chandrapur- 1) The SPS suggested in the 26.06.2013 meeting shall be in Warora ckt out of service operation such that in the event of tripping of Warora Chandrapur line backing down of 600MW at APL Tiroda shall be wired up. All other settings/conditions decided in the 26.06.2013 meeting shall be same. 2) In the event of tripping of Warora Chandrapur line, POWERGRID shall automatically bypass FSC on one circuit of Raipur-Wardha line. 3) This arrangement shall be implemented till the 2nd ckt of Warora Chandrapur and LILO of 2nd ckt of Chandrapur Parli at Chandrapur-II is commissioned. Further APL Tiroda was requested to incorporate additional logics as suggested by NLDC as regards to backing down of generation envisaged in SPS for SR-WR synchronization. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 16

It was decided the above SPS would be reviewed in a separate meeting consequent to commissioning of 2 nd ckt of Warora-Chandrapur and LILO of 2 nd ckt of Chandrapur Parli at Chandrapur-II. Committee noted the same. 8.1.C) SPS for CGPL units : The revised scheme as agreed in the 24 th WRPC meeting held on 09.10.2013 at Goa is as follows SPS for CGPL CGPL Gen (MWs) Chorania-1 Chorania-2 Bhachau-1 Bhachau-2 Jetpur-1 & 2 line Loading in MW Action at CGPL 1 >3100 X X >1500 2 >3100 X X >1500 3 >3100 X X >1500 4 >3100 X X >1500 5 >3100 X X >1500 6 >3100 X X >1500 7 >3100 >1200 Alarm for reduction in X- indicates tripping of the line. Trip mills this will reduce generation by @500MW except for condition 2 where units would trip generation so that the Jetpur lines loadings are maintained around 1200 MW GETCO representative stated that Bachu Vadavi lines are extension of CGPL Bachau lines, therefore, tripping of Bachau Vadavi line needs to be incorporated in the above SPS. Committee decided that this issue would be taken up in a meeting on review of SPS in WR and noted that SPS as tabulated above has been implemented by CGPL. 8.1.D) Defense mechanism for high frequency : As per Zalte Committee report following units were identified for automatic tripping at high frequency (51.5 Hz) to help arresting the rise of frequency in case of islanding of WR from rest of NEW grid KSTPS-7 (500 MW) 2, VSTPS-7 (500 MW) 3 and CGPL-10 (830 MW). In the 24 th WRPC meeting the above generating stations requested for adding time delay for tripping and it was decided that the above units would trip at 51.5Hz with a time delay of 30sec. It was clarified during the discussions, that the generating units would sense the frequency at their ends and initiate necessary tripping. NTPC & CGPL representatives stated that they have implemented the scheme within the above time delay. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 17

8.2 Proposed SPS/Islanding scheme: 8.2.A) : SPS for reliable evacuation of Sipat generation : The SPS was discussed in the special meeting held on 03.09.2013 at TAPS 3 & 4 wherein NTPC representative made a presentation on the SPS. The group suggested that instead of tripping of 660MW, NTPC may explore other options such as HP/LP bypass so that the unit is not tripped/stressed unnecessarily. NTPC representative informed that they would revert after ascertaining the effectiveness of HP/LP bypass system. The group suggested that PCGIL would provide potential free signal at Sipat NTPC & ACIBL and necessary telemetry data of line flows. WRLDC representative stated that backing down of generation through HP/LP bypass would be a slow process and would result in overloading of the ICTs. They would give their requirement to NTPC Sipat. It was informed that ICTs can be loaded more than the rated capacity for 5-10mins depending on the ambient temperature subject to temperature rise of oil within permissible limits. NTPC representative intimated that they have received engineering approval from their corporate office for tripping of unit. A revised proposal has been sent to their corporate office for backing down of generation in line with above suggestions. Corporate approval has yet not been received. Committee decided that the above SPS would be discussed in the separate meeting. 8.2.B) : SPS at 4x300 MW Balco IPP : In the 454 th OCC meeting it was intimated that the SPS at Balco was scheduled for commissioning by Nov 2013 after commissioning of first unit of 4x300 MW Balco IPP. It was also reported that as a consequence of disconnection from Chhattisgarh, a revised islanding scheme would be in place at Balco. Further as per MOM of 17 th meeting of WR regarding connectivity/oa applications held on 03.01.13, Balco was asked to implement SPS to trip selected units from 4x135MW in case of load throw off of Aluminum refinery load. Member Secretary, WRPC suggested that NTPC, Balco & PGCIL meet together to device suitable scheme & implement at the earliest. Committee decided that the above SPS would be discussed in a separate meeting. 8.2.C: Islanding schemes for Nuclear Power Stations: 8.2.C.1 ) :KAPS : In pursuance with the decision in the special meeting held on 03.09.2013 at TAPS 3 & 4, SLDC GETCO and KAPS have formulated the islanding for KAPS. The same is enclosed at Annex- 8.2.C.1. Committee decided that the above islanding scheme would be discussed in a separate meeting. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 18

8.2.C.2): TAPS 1&2 Islanding: The formulation of islanding scheme for TAPS 1 & 2 was discussed in the special meeting held on 03.09.2013 at TAPS 3 & 4. The group suggested following; a) TAPS 1 & 2 islanding with Boisar load was discussed. However due to fluctuating load at Boisar (MSETCL) MIDC load it did not seem feasible, since fine generation control is not available at TAPS 1 &2. b) In view of above a it was suggested to isolate TAPS 1 &2 from MSETCL at higher frequency as a preparedness to islanding and would remain with GETCO system (i.e. Vapi-Bhilad). Subsequently TAPS 3 &4 islanding with Boisar load may be thought of. c)wrldc would prepare a scheme of isolation points and logic in consultation with GETCO, MSETCL & TAPS. d) The details of the settings would be worked out by WRLDC in consultation with GETCO, MSETCL & TAPS. Committee decided that the above islanding scheme would be discussed in a separate meeting. 8.2.C.2) TAPS 3&4 Islanding: The formulation of islanding scheme for TAPS 3 & 4 was discussed in the special meeting held on 03.09.2013 at TAPS 3 & 4. The group suggested following; a) TAPS 3 & 4 one unit to island with Boisar load and other unit to island with house load. b) WRLDC would prepare the details of the islanding scheme in consultation with GETCO, MSETCL & TAPS. c) The details of the settings would be worked out by WRLDC in consultation with GETCO, MSETCL & TAPS. Committee decided that the above islanding scheme would be discussed in a separate meeting. 8.2.D) Sugen Islanding: The formulation of islanding scheme for Sugen TPP was discussed in the special meeting held on 03.09.2013 at TAPS 3 & 4. The group suggested following: Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 19

a) Isolation of feed from 220 kv Kim Sugen may be opened at higher frequency 48.2 Hzs as a preparation to islanding. b) PLC based load trimming to be implemented to match generation at Sugen, exact settings can be decided later. Committee decided that the above islanding scheme would be discussed in a separate meeting. ITEM NO. 9: Follow up items: 9.1: AUFLS Quantum & Stages A. Back ground: In the 2nd NPC meeting held on 16.07.2013 at Delhi, four (4) stages of automatic under frequency relay operation starting from 49.2 has been approved. CEA vide letter No.8/X/MMS/Gm-13/1007-1012 dated 06.08.2013, have intimated that while the process for complete implementation of UFR based load shedding may be continued so as to complete the same within three months, the frequency stages of 49.2 and 49.0 Hz with required load reliefs may be implemented by all the concerned utilities within a fortnight s time by raising the frequency settings of the existing under frequency relays suitably and compliance of the same may please be communicated to this office by 25th August 2013. The implementation of load shedding for all the four stages (i.e. 49.2, 49.0, 48.8 and 48.6Hz.) be taken up subsequently and completed by 22.10.2013. In the 24 th WRPC meeting the status was up dated as follows; 1. First two stages of AULFS setting have been already implemented by all the WR constituents. 2. Gujarat informed that they have implemented all the four stages. 3. Other Constituents agreed for implementation of other two stages by March 2014, as procurement of UFR relays is also on going. The status on implementation of the AUFLS was reviewed in the meeting held on 17.12.2013 at WRLDC Mumbai. The status updated as on 15.12.2013 is as follows. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 20

AUFLS implementation status in WR as on 15.12.2013 (All figures in MW) 49.2Hz 49.0Hz 48.8Hz 48.6Hz Actual Target Actual Target Actual Target Actual Target Gujarat Avg. 773 580 726 580 1117 580 1025 590 Peak MP Avg. 468 460 450 460 460 460 465 465 Peak Chattisgarh Avg. 110 150 114 150 117 155 91 155 Peak Maharashtra Avg. 1108 805 1200 810 765 815 851 820 Peak Goa Avg. 25 25 25 25 Peak DD Avg. 10 15 15 15 Peak DNH Avg. 30 30 35 35 Peak TOTAL Avg. 2459 2060 2490 2070 2459 2085 2432 2105 Peak GETCO, MSETCL, MPPTCL and CSPTCL representatives informed that 4 stage AUFLS scheme was implemented. CSPTCL representative stated that the quantum of AUFLS implemented in all the four stages is less than the targets given to them the same would be implemented at the earliest. Information in regards to implementation of AUFLS in respect of GOA, DD & DNH is awaited. SE (P), WRPC appreciated MSETCL, GETCO, MPPTCL and CSPTCL for implementation of 4 stage AUFLS but also expressed concern about GOA, DD & DNH as these utilities not given any information regarding the implementation status of AUFLS in their system. He requested to expedite the procurement process of the UFRs and update the status. SE (P), WRPC further requested all the constituents to give the list of the feeders with UFRs in a soft copy (excel sheet) within 15 days along with other details like peak load (MWs), average load (MWs), kv, substation etc.., He also requested utilities to furnish the details of df/dt relays to WRPC in soft copy. 9.2) Over-Voltage Protection for Transmission lines in Western Region Back ground: WRLDC vide letter WRLDC/MO-I/1658/2012/8960 dtd. 15.05.2013 have intimated that, considerable number of critical 765/400 kv lines is being kept out for containing High voltage. Also there are several cases of multiple tripping of feeders emanating from a single node on over voltage. Multiple tripping on O/V at one node or in a single corridor may lead to transmission depletion adversely Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 21

affecting grid security. In such cases the drop off to pick ratio should be increased to 99% while the over-voltage rating should be changed to 112 % to increase the reliability of the grid. The high drop-off to pick-up ratio of the O/V relays (say 99% and above) ensure quick reset of the relay so as to avoid multiple tripping of feeders on over voltage. For a standalone static type of relay the drop-off to pick-up ratio may be relooked and modified to 99% at all locations in WR grid by the respective utilities / constituents. In case the relay is of multi-function numerical type where the over voltage function is being utilized for O/V protection the vendor may be requested by the concerned utility to modify the ratio (drop-off to pick up) to 99%. Following nodes in western region are identified as high voltage node where line trip on over voltage protection: Chandrapur, Parli, Raigarh, Raipur, Wardha, Indirasagar, Kolhapur, Solapur, Karad, Rajgarh, Khandwa, Itarsi, Dhule, Seoni, Nagda, Kasor, Bhadrawati, Akola. Hence the above changes may be discussed in the meeting and implemented on priority. Matter may be taken as most urgent in view of reliable and secured grid operation. The matter was discussed at length in the 117 th, 118 th & 119 th PCM. a) It was informed that the maximum continuous rating of the equipments in the system is around 5% above the nominal voltage (i.e. 420kV). Further the drop off to pick up ratio hysteresis is set not just to inhibit the relay from operating but while deciding the hysteresis following factors are required to be considered; (i) The basic insulation level on which the system equipments are designed. (ii) Time to settle down the system voltages. (iii) Tripping of breakers around the safe voltage limits. Therefore adopting the setting of drop off to pick up ratio to 99%, would ensure that the line would trip (breaker opening) above 435kV, which is dangerous. Committee felt that the drop off to pick up ratio be set around 97%. b) Protection sub-committee suggested the following remedial measures; 1. The overvoltage trip setting shall be graded for magnitude and time at the nodes where sustained over voltage above nominal voltage is observed by the utilities and the settings adopted be communicated to WRPC. The time delayed overvoltage trip setting shall not exceed 110%. 2. Manual control for overvoltage shall start at 415kV and manual opening of lines on overvoltage should stop at 430kV. 3. WRLDC would carry out operation studies to identify over voltage nodes for manual control at 415kV, 420kV, 425kV and 430kV. 4. WRLDC would carry out operation studies for time co-ordination of over voltage settings. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 22

5. In addition to the lines already identified for over voltage tripping some more lines need to be identified in consultation with utilities as in present scenario after exhausting MVAR absorption by generator, line opening is only the option left to operator to contain high voltage. 6. The tap change is an operational issue and generators should set the tap(off-line) as suggested by WRLDC during opportunistic shut downs. Tap setting shall only be suggested seasonally. Committee suggested manual action to control the voltage should start from 105 % and auto line trip on over voltage should start from 106 % with appropriate voltage and time grading. The committee requested WRLDC to identify high voltage nodes and lines need to be tripped in a co-ordinated manner. Committee requested utilities to furnish the O/V relay settings of lines in their system to WRPC and WRLDC by 15.01.2014. WRPC and WRLDC would then review the existing settings and revised over voltage settings (magnitude and time graded) would then be intimated to utilities for implementing the same. However, utilities can implement their design till any review is done at WRLDC/WRPC. 9.3: Status of Bus Coupler and Bus Bar protections at S/s Back Ground: WRLDC vide letter WRLDC/MO-I/1658/2012/8960 dtd. 15.05.2013, have intimated that, there has been several occasions in the grid when the Bus Couplers and Bus-Bar Protections are kept out at substation without any intimation to WRLDC/SLDCs. In case of Bus coupler being kept out of service, all the feeders are connected on both buses. During any fault on one of the bus, it will lead to tripping of all the feeders as the fault will be fed to both buses. On the same, if Bus bar protection is kept out of service, any fault on either of bus will led to tripping of feeders on both buses. In the 118 th PCM, Chairman TCC stated that the Bus Bar protection schemes should be provided by the respective utility at the earliest, without expecting funding under R&U from MoP, GoI. The status as informed by utilities with regards to above, in the 119 th PCM is as follows: Utility Total No. of S/Ss No. of S/Ss where BB protection Balance Expected date of commissioning 400 kv 220 kv 400 kv 220 kv 400 kv 220 kv 400 kv 220 kv GETCO All 7 May 14 MSETCL All 1 Oct 13 MSPGCL All 3 MPPTCL 55 All 29 7 (Multi Bus) Mar 14 CSPTCL 16 All 11 0 5 Mar 14 Total Committee felt that the above information be updated by utilities and requested to expedite the commissioning of BB protection wherever it was not provided. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 23

9.4: Time synchronization, non-working of DR & Main-2 of Ranchodpura line-2 at Dehgam S/s: Back Ground: PGCIL vide letter WRTS II/O&M/273/AV/1211 dated 30.03.2013 & WRTS/DEH/SS/385/113 dtd. 28.01.2012, have intimated that the pending protection issues related with GETCO bays at Dehgam S/S have not been attended so far and requested GETCO for rectification of the following issues; (i) Main-2 Distance Protection Relay (Siemens make 7SA522) of 400kV Dehgam -Ranchodpura feeder is faulty since April 2011. (ii) In all the 400kV GETCO bays (Ranchodpura-1&2, Soja, Wanakbori) at Dehgam S/S, both Main-1 & Main-2 DPRs are of same make and principle (i.e. Siemens make & 7SA522 model). The same needs to be replaced. (iii) The existing DR & its PC are not working and have become obsolete. Therefore DR needs to be configured in Main-1/Main-2 protection along with wiring of digital inputs & GPS time synchronization. In the 119 th PCM, GETCO representative informed that the time synchronization will be done within 2 months i.e. by 05.11.2013. GETCO representative informed the committee that replacement of equipment w.r.t. i & ii was already implemented and iii will be rectified by January 2014. 9.5: Auto recloser of 400kV Satpura-Koradi line: Back Ground: MPPTCL vide letter No. 07-05/STP-79/487 dtd. 15.02.13, have intimated that there is a repeated failure of auto reclose of 400kV of 400kV Satpura-Koradi line at Satpura end, since the auto reclose from Koradi end was successful on transient faults on line and requested PGCIL to attend the failure of the auto reclose at Satpura S/S. In the 118 th PCM, PGCIL representative informed that the circuit breaker replacement has been undertaken and on availability of T/B the A/R will be commissioned. The same is expected to be commissioned in August 2013. In the 119 th PCM, Committee expressed that PGCIL should put the auto recloser in service by 15.10.2013. PGCIL representative informed the committee that breaker was replaced and A/R was changed. Committee noted. 9.6): Frequent tripping of 132 kv RP Sagar-Gandhisagar line on phase to ground faults. In the 119 th PCM, WRLDC representative stated that, 132 kv Gandhisagar-RP Sagar I & II are frequently tripping on single phase to earth fault during the period of July-Aug 13.The reason for tripping of lines in transient fault need to analyzed. These lines are Inter-regional so they should be in healthy condition during operation. Committee expressed that MPSGECL and WRLDC shall Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 24

take up the matter with Rajasthan and NRLDC respectively. MPSGECL and WRLDC representatives informed that the matter was taken up with their respective counter parts and stated that the frequency of tripping has reduced. Committee noted the same. 9.7) NGR bypass scheme of line reactor to convert it as bus reactor in State owned transmission lines. Back Ground: 9.7.1: Many 400 kv nodes in WR are experiencing high voltages. Several lines are kept open to control the high voltage in Western region. The line reactors of these lines are available for taking them in to service as bus reactors. PGCIL has commissioned the NGR bypass scheme to convert the line reactor as bus rector for most of the lines in WR-I and WR-II. Other constituents are also requested to expedite the same to use the line reactor as bus reactor wherever such line reactors are available. This will help in controlling the high voltage scenario in Western region. 9.7.2: In the 119 th PCM, Committee felt that, whenever line along with its reactor is out of service and wherever NGR bypass scheme is available, the line reactor should be used as a bus reactor. However this is possible only if NGR bypass scheme is already installed on the line reactors. The need for NGR bypass requirement was also discussed and it was decided that the STUs would explore providing the NGR bypass scheme wherever possible (especially at high voltage nodes). WRLDC was requested to forward the list of lines where line reactors are required to be converted to Bus reactors. POWERGRID vide letter No WRTS II/O&M/250/1447-4656 dtd 27.11.2013 (copy enclosed at Annex.-9.7.2), has updated the status on implementation of NGR bypass schemes implemented in WR-II of POWERGRID. 9.7.3: It was intimated that the line reactors can be converted and used as Bus reactors only if the S/Ss have one and a half Bus Bar System and the line reactors are connected to the Bus side of the line reactor. WRLDC have forwarded list of lines (Annexure 9.7.3) where line reactors are required to be converted into bus reactors in order to control the over voltage in the system. Committee requested utilities to check the above implementation feasibility and intimate WRPC at the earliest. Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 25

ITEM NO. 10: Other Items: 10.1: Provision of high speed Bus bar protection along with LBB at 132 kv stations: GETCO through vide letter no. CE (TR)/ACE (Testing)/WRPC/11/1862 dated 03.12.2013 (annexure 10.1) requested WRPC to deliberate on above subject. Few utilities expressed that there are constraints in implementation of Bus bar protection to 132 kv system like space, single bus, old existing bus bars. MSETCL informed that they are providing bus bar protection with LBB for 132 kv in case of all generating stations. SE (P), WRPC informed the committee that as per IEGC regulations, bus bar protection is mandatory for 220 kv and above substations. Hence, the committee felt that utilities themselves may decide on provision of bus bar protection to 132 kv as per the requirement of their system and state regulations. ITEM NO. 11: Date and Venue of the next meeting The date and venue for the next (121 st ) PCM will be intimated as soon it is decided. ********* Minutes of120 th Protection Committee of WRPC held on 09.01.2014 at Mumbai 26

Annexure-1 LIST OF PARTICIPANTS OF 120th PCM MEETING HELD ON 09.01.2014 AT WRLDC, MUMBAI Sl.No. Organisation & Name Designation E-mail Mobile No. WRPC 1 Shri S.D. Taksande M.S. ms-wrpc@nic.in 9820878384 2 Shri Satyanarayan S. S E opn-wrpc@nic.in 9223399938 3 Shri P.D.Lone E E pramod.lone@gmail.com 9867622823 4 Shri Shiva Suman A D protectionwrpc@gmail.com 9869910968 MSETCL/MSPGCL 5 Shri S.G. Kashikar Dy.C.E. dycetestingkoradi@gmail.com 9881960930 6 Shri S.S. Rajurkar S E se1om@mahatransco.in 9769509020 7 Shri R.H. Satpute S E setcc7500@mahatransco.in 9930128535 8 Miss S.S. Kumbhai S E se3500@mahatransco.in 8411001431 9 Miss.V.I. Mukhedkar S E se6520@mahatransco.in 9767104500 10 Shri A.V. Deo S E se4500@mahatransco.in 8554993290 11 Miss. Chimte E E ee6170@mahatransco.in 9767104409 12 Shri D.J. More E E eetic2@mahagencontps.com 8411959554 13 Shri Ashok Dhapare E E ee3150@mahatransco.in 7507672222 14 Shri Dongargaonkar Dy.E E setcc6500@mahatransco.in 9767104504 15 Shri Bharamgunde C.L. Dy. E E setcc3500@mahatransco.in 8411001562 16 Shri D.P. Nandanwar Dy. E E dyee27500@mahatransco.in 9769509798 MPPGCL/MPPTCL 17 Shri R.S. Shrivastava S.E. se400kvbp1@gmial.com 9425805010 18 Shri R. Shrivastava S.E. raghvensh@yahoo.in 9425806663 19 Shri Hemant Pathak S.E. 9425611041 20 Shri Sunil Yadav E E setindore@yahoo.com 9425804916 21 Shri R.C. Sharma E E eesubldcind@yahoo.com 9425804970 CSPTCL 22 Shri N.K. Parmar E E nk.parmar@cseb.gov.in 9329530735 GETCO 23 Shri M U Swad E E eetestingasoj.getco@gebmail.com 9925208731 24 Shri B.M. Shah D E demissldc.getco@gebmail.com 9925212836 25 Shri K G Patel D E det.gsecl@gebmail.com 9925210977 WRLDC / POWERGRID 26 Shri P. Pentayya G M ppentayya@gmail.com 9869072437 27 Shri K.Muralikrishna C M mkkodakandla@gmail.com 9869450219 28 Shri Anand Dubey C M anand.dubey_pg@rediffmail.com 9428504065 29 Chitrankshi G. Sr.Er. chitra_20j@yahoo.com 9869004892 30 Shri Chandan Kumar Eng. protectionwrldc@gmail.com 9869251460 31 Shri Ravi Wadyalkar Mgr. wravi@powergridindia.com 9423762547 32 Shri Nilesh B. J E nilesh@powergridindia.com 8275039030 NTPC 33 Shri D.Roy Chowdhury A. G. M. ddrcc85@yahoo.in 9425222094 34 Shri A.K. Chandeliya D. G. M. akchandeliya@ntpc.co.in 9004497151 NPCIL 35 Shri R S Arekar SO/D rsarekar@npcil.co.in 9421633806 36 Shri Ashwin Yadav SO/E akyadav@npcil.co.in 8007991735 Tata Power 37 Shri M.V. Kini D.G.M. mvkini@tatapower.com 9223321140 38 Shri Alok Uppal C Mgr. uppalalok@tatapower.com 9099006430 39 Shri Girish Jawale Mgr. gtjawale@tatapower.com 9223311419 Torrent Power 40 Shri M.J. Modi Mgr. milindmodi@torrentpower.com 9227233328 Reliance Infra 41 Shri Mohan waingankar D.G.M. mohan.waingankar@relianceeada.com 9324216664 APL 42 Shri Uday Trivedi G M udaytrivedi@adani.com 9099055054 JPL 43 Shri R.K. Srivastav A G M rkshrivastava@jindalpower.com 9329445016

Annexure 2.1.1

Annexure 2.1.2

Annexure 2.1.3

SINGLE LINE DIAGRAM OF OCCURRENCE AT OMKARESHWAR HPS TRIPPING OCCURRED ON DATE - 21.09.2013 220 KV S/s Itarsi 400 KV S/s Indore (220 KV Bus) 220 KV S/s Handia 220 KV S/s Chhegaon 220 KV S/s Julwania Ckt - I Ckt - II 220 KV S/s Khandwa 3X40 MVA X'mer 220 KV S/s Barwaha (220 KV Bus) 160 MVA X'mer 220 KV S/s Barwaha (132 KV Bus) Omkareshwar Power Station (220 KV Bus - I) GEN - 7 GEN - 5 GEN - 3 GEN - 1 220 KV S/s Nimrani 132 KV S/s C. Khargone 132 KV S/s Sanawad Omkareshwar Power Station (220 KV Bus - II) - Breaker Close - Breaker Open - Breaker Tripped 220 KV S/s Chhegaon GEN - 8 GEN - 6 GEN - 4 GEN - 2

Annexure 2.1.7

Annexure - 2.1.8

Annexure 2.1.9

220 KV S/s Rewa 400 KV Sukha (PGCIL) (220 KV Bus) SINGLE LINE DIAGRAM OF OCCURRENCE AT ATPS CHACHAI TRIPPING OCCURRED ON DATE - 16.10.2013 220 KV Kotmi Kala (CSEB) { 132 KV S/s Rajmilan (MPPTCL) { 220 KV S/s Sidhi 220 KV Railway Traction - II GEN - 4 Ckt - III 220 KV Bus Coupler GEN - 3 400 KV Birsinghpur SGTPS (220 KV Bus) Ckt - II Fault 220 KV S/s ATPS (220 KV Bus - I) 220 KV S/s ATPS (220 KV Bus - II) 220 KV Railway Traction - I 220 KV S/s Jabalpur Ckt - I GEN - 5 220 KV S/s ATPS (132 KV Near Bus in NTPC System) Ckt - II 220/132 KV 63 MVA X'mer Ckt - II Ckt - I 132 KV Bus Coupler 220 KV S/s Anuppur (220 KV Bus) Ckt - I Ckt - II 220 KV S/s Anuppur (132 KV Bus) 220 KV S/s ATPS (132 KV Far Bus in M.P System) 132 KV S/s - Breaker Close - Breaker Open - Breaker Tripped 132 KV S/s HJIM (Industrial Feeder) 132 KV S/s Kotma (Radial Feeder) 132 KV S/s Dindori (Radial Feeder)

Annexure-2.1.11

Annexure 2.1.12

Occurrence on 23 rd August, 2013 at Padghe Substation, Maharashtra: Annexure 2.2.1 1. Schematic Network Diagram:

Annexure - 2.2.2 Occurrence at 400/220 kv Jejuri and nearby S/s, Maharashtra on 24 th August, 2013 Schematic Network Diagram:

Annexure 2.2.3 SLD OF 220KV AMLANER SUBSTATION ON DATED 15.09.2013 220KV Deepnagar 220KV Bambori 220KV Dondaicha 220KV Dhule 220KV CT FAIL MAIN BUS- 220KV 220/132K ICT-I 100MVA 220/132K ICT-I I 100MVA 132KV BUS 132KV Chopda 132KV Amalner 132KV Dharangaon 132KV Nardane CB TRIP

CB NOT TRIP

Annexure 2.2.4 Occurrence on 18 th September, 2013 at Nasik GCR and OCR S/s, Maharashtra: Schematic Network Diagram:

Occurrence on dated 20.09.2013 at 400 kv Babhaleshwar S/S Annexure 2.2.5 220 kv Ranjangaon 220 kv Nashik 1 220 kv Nagar 1 220 kv BBLR 1 220 kv Walunj 315 MVA, 400/220 kv, ICT-1 315 MVA, 400/220 kv, ICT-2 220 kv Main Bus 1 220 kv B/C 220 kv Main Bus 2 500 MVA, 400/220 kv, ICT-3 Bph string insulator flash over 220 kv Nashik 2 220 kv Alephata 220 kv Nagar 2 220 kv BBLR 2 220 kv Bhenda 220 kv CSN

Annexure -2.2.6 Occurrence on 1 st October, 2013 at Deepnagar S/s, Maharashtra Schematic Network Diagram:

Occurrence on 27 th October, 2013 at Chandrapur, Maharashtra Schematic Network Diagram: Annexure 2.2.7 Figure 1 : Schematic Diagram of Affected Area Figure 2 : Chandrapur Sub-station prior to the event Figure 3 : Chandrapur Sub-station after the event

Occurrence at 220KV Chalisgaon Substation on 13.11.2013 Annexure 2.2.8 Not Trip 220/132KV ICT-I 220/132KV ICT-II Not Trip TBC OFF 132KV Main Bus 132KV Aux. Bus R Ph CT Burst Kannad Pachora-I Pachora-II CSN-I CSN-II Dhule Manmad Pimperkhed CB Tripped

Occurrence at 400/200 kv JPL on 6 th September, 2013 Annexure -2.3.1 Schematic Network Diagram:

Occurrence on 22 nd October, 2013 at Korba (East), Chhattisgarh Annexure 2.3.2 Schematic Network Diagram:

Occurrence on 29 th October, 2013 at Korba TPS Annexure -2.3.3 Schematic Network Diagram: Figure 1 : Schematic Diagram of Affected Area

Occurrence on 30 th October, 2013 at JPL Power station,tamnar Annexure 2.3.4 Schematic Network Diagram Figure 1 : Schematic Diagram of Affected Area

Annexure 2.4.1 Occurrence at 400/200 kv Jetpur and Nearby S/s, Gujarat on 31 st August, 2013 Schematic Network Diagram:

Occurrence at Amreli S/s and Nearby Area, Gujarat on 10 th September, 2013 Annexure -2.4.2 Schematic Network Diagram:

Occurrence at Bhadrawati HVDC S/s, Maharashtra on 19 th August, 2013 Annexure 2.5.1 Schematic Network Diagram:

Occurrence at Bhadrawati HVDC S/s, Maharashtra on 1 st October, 2013 Annexure -2.5.2 Schematic Network Diagram:

OFFICE OF THE EXECUTIVE DIRECTOR (ENGINEERING) MADHYA PRADESH POWER GENERATING COMPANY LTD BLOCK No. - 8 & 9, SHAKTI BHAWAN, RAMPUR, JABALPUR (M. P.) - 482008 E-mail: cedesign_mpeb@yahoo.com Tele. - 0761-2702630 & 0761-2660063 Fax- 0761-2660063 No.- 07-02/Protec./ 1529 Date : 31.10.2013 To The Superintending Engineer(Prot.) Western Region Power Committee F3, MIDC Area, Andheri (East) Mumbai - 400093 Fax No.022-28370193 E.MAIL- prc-wrpc@nic.in, devesh185@yahoo.com, mmdhakate@rediffmail.com, pramod.lone@gmail.com, ATTN. MR. M.M. DHAKATE, SUP. ENGR. (P) Sub:- Follow up of recommendation of 117 th PCM of WRPC on past occurrence. Dear Sir, *** This is with reference to follow up of recommendation of 117 th PCM of WRPC on past occurrence at ATPS, Chachai on 8 th, 12 th & 14 th Aug. 2013. In this regard, it is to intimate that relay setting and testing of 132KV ATPS- Anoopur feeder has been done and found in order (for reference setting is enclosed). Regarding bus bar protection, M/s ABB Commissioning Engineer has visited the site and tested the Bus Bar and LBB protection scheme from 18.10.2013 to 19.10.2013. The bus bar scheme could not be put on service as complete scheme RADSS is obsolete and spare required are not available for replacing faulty modules and also it has become beyond repairable. Hence, M/s ABB suggested upgrading the conventional scheme to Numerical scheme. Therefore, site authorities are being requested to procure and replace Bus Bar Scheme with latest Numerical based scheme after approval from competent authority Thanking you Encl: as above Yours sincerely (S.K. SHAH) EXECUTIVE DIRECTOR (ENGINEERING) MPPGCL: JABALPUR Copy to:- 1. The Executive Director (O&M:Gen), MPPGCL, Jabalpur The Superintending Engineer (ET&I), MPPGCL, ATPS, Chachai

Kind Attn : Shri S. Satyanarayan S.E. (Protection) WRPC MPPTCL s FOLLOW UP OF WRPC RECOMMANDATION ON SYSTEM DISTURBANCES COVERED IN 117 th & 118 th PCCM : However it has been communicated during the 118 th & 119 th PCCM, but not linked properly and old text repeated in the minutes of 119 th PCCM. It is therefore, desired information regarding remedial actions taken on the points mentioned are as following; 2.3.4: Occurrence at 220 KV S/s Pithampur on dt. 16.03.13 WRPC Recommendation: i. Committee felt that due care should be taken during relay setting. ii. Remedial actions: Further line VTs should be installed for line protection. i. Discrepancies related to time settings and bus PT selection relay have ii. been corrected, and checked for all other elements. In MPPTCL, Bus PT arrangement is in practice for 220 KV feeders. Based on the WRPC recommendations, a proposal for line VT arrangement for line protection is submitted. 2.3.5 : Occurrence at 220 KV S/s Pithampur on dt. 29.01.13 WRPC Recommendation: i. Committee felt that OLTC Buchholz relay should not have operated. ii. Adequate load trimming scheme should be provided. Remedial actions: i. OLTC Buchholz relay operated due to heavy jerk on 132 KV feeder fault. This relay is checked for any discrepancy, it found to be in order. ii. Load dropping scheme revised, and incorporated 33 KV Metalman I & II and 33 KV Novino Industrial feeders in addition to existing 132 KV Bagadi, Betma and Jamli feeders, so that at least 120 MW load relief can be obtained in such cases. 2.3.6 : Occurrence at 220 KV S/s Pithampur on dt. 18.04.13 WRPC Recommendation: i. Committee felt that there was problem in scheme logic and same should be corrected. Remedial actions: i. GE s engineer checked the scheme and done some modifications. After through testing bus bar scheme taken in to service in May 2013.

2.3.9 : Occurrence at 220 KV S/s Jabalpur on dt. 15.01.13 WRPC Recommendation: i. Over flux settings of transformer need to be cheeked / tested. Remedial actions: i. Over Fluxing feature of AREVA make P633 Differential relay is used with following settings; Over Flux Alarm : 1.12 v/f reference, time delay : 15 sec. Over Flux Trip : 1.15 v/f reference, time delay : 10 sec. ii. Relay tested for over fluxing feature, and found to be operated correctly. It is under observation. 2.3.12 : Occurrence at 220 KV S/s Birsinghpur on dt. 23.03.13 WRPC Recommendation: i. Bus Bar Protection scheme should be in service. Remedial actions: i. Bus Bar Protection scheme taken in to service in July 2013. 2.3.15 : Occurrence at 220 KV S/s Nagda on dt. 29.04.13 2.3.16 : Occurrence at 220 KV S/s Pandurna on dt. 21.03.13 WRPC Recommendation: i. MPPTCL should pursue suitable / timely preventive and routine maintenance of CTs. Remedial actions: i. Periodical maintenance activities for CTs also done twice a year during pre monsoon and post monsoon maintenance schedules. 2.3.17 / 18 : Occurrence at 220 KV S/s Barwaha on dt. 26.04.13 / 27.04.13 WRPC Recommendation: i. Defective Bus Bar Protection Scheme should be repair / replace at earliest. ii. Trippings of Generator units are undesirable and settings should be reviewed Remedial actions: i. Procurement of new bus bar protection scheme is in process for 220 KV S/s Barwaha. ii. Generating units of OSP pertaining to NHDC, not to MPPGCL. NHDC should be advised to take remedial action to avoid repetition of such trippings. Similar points recorded in MOM of 116 th PCCM, NHDC may be asked to submit compliance.

2.3.20 : Occurrence at 220 KV S/s Malanpur on dt. 28.02.13 WRPC Recommendation: i. Operation of E/F relay at Malanpur and in Zone II from Gwalior (PGCIL) end ii. Remedial actions: on line fault was undesirable. Trippings of 220 KV Malanpur Auriya line from both ends was undesirable. i. ABB make REL 511 DPR at Malanpur end of the DPR found defective it is ii. replaced by SEL make DPR. To facilitate carrier aided trippings, protection couplers for Malanpur is under procurement stage. iii. Timing of Tripping of 220 Malanpur Auriya line is different and not related 118th PCM : with above trippings. 2.3: System disturbances in MPPTCL/MPPGCL system. 118 : 2.3.1 : Occurrence on 24.05. 2013 at 400kV Bina S/S,: WRPC Recommendation: Bus Bar protection should be brought into service at the earliest. Also the DPR at Guna end should be checked. Remedial actions: i. Bus Bar Protection scheme taken in to service on 27.05.13. ii. The DPR of 220 KV Guna _ Bina I feeder operated on C Phase, Zone II correctly after this tripping 220 KV S/s Guna became a radial end, hence the DPR of 220 KV Guna_ Bina II was not operated. However DPRs at Guna end tested and found to be satisfactory.

S. No Tripping Restoration kv Element Actual Detail Reason of Tripping System Date Time Date Time Annexure - 3 1 220 Sarni S/s Inter-Connector I 02.10.13 15:46 02.10.13 16:45 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 2 220 Sarni S/s Inter-Connector I 02.11.13 05:55 02.11.13 06:35 Interconnector-I tripped from PH end with B phase fault & E/F relay on Y phase. MPPGCL N STPS, Sarni 3 220 BRS- AMK 2 03.09.13 11:18 03.09.13 11:44 Line tripped on B Phase fault, Zone-1. MPPGCL N SGTPS, Birsinghpur 4 220 Jabalpur Feeder No.1 03.10.13 05:07 03.10.13 05:29 Line tripped on B&C phase fault, Z-2, DPR operated MPPGCL Y ATPS, Chachai 5 220 Sukha Feeder 03.10.13 05:07 03.10.13 05:35 Line tripped due to DPR operated MPPGCL Y ATPS, Chachai 6 220 BRS- Satna 04.09.13 09:52 04.09.13 10:22 Line tripped on Y and B phase fault, DPR operated, Zone-2. MPPGCL N SGTPS, Birsinghpur 7 220 Sidhi Feeder 04.09.13 04:47 04.09.13 05:08 Line tripped on A Phase fault, Zone-1. MPPGCL Y ATPS, Chachai 8 220 Sidhi Feeder 05.08.13 20:50 05.08.13 22:10 Line tripped on A Phase to Earth Fault. MPPGCL Y ATPS, Chachai 9 220 Jabalpur Feeder No.1 06.10.13 00:43 06.10.13 00:51 Line tripped due to C Phase fault, Z-1, DPR operated MPPGCL Y ATPS, Chachai 10 220 Jabalpur Feeder No.1 06.10.13 03:56 06.10.13 04:07 Line tripped on C phase fault, Z-1, DPR opeerated MPPGCL Y ATPS, Chachai 11 220 BRS- Satna 07.08.13 01:14 07.08.13 01:36 Line tripped on R Phase fault, Z-1, 13.3 Km from Satna end. MPPGCL N SGTPS, Birsinghpur 12 220 Jabalpur Feeder No.1 07.09.13 11:44 07.09.13 11:56 Line tripped on A Phase fault, DPR Operated, Zone-1. MPPGCL Y ATPS, Chachai 13 220 Sarni S/s Inter-Connector I 07.10.13 15:55 07.10.13 16:16 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 14 220 BRS- AMK 2 08.08.13 23:20 08.08.13 23:49 Line tripped on R phase fault, Z-1. MPPGCL N SGTPS, Birsinghpur 15 220 Sidhi Feeder 08.09.13 11:52 08.09.13 12:28 Line tripped on A Phase fault, Zone-1. MPPGCL Y ATPS, Chachai 16 220 Sidhi Feeder 08.11.13 00:17 08.11.13 00:30 Line tripped on A phase fault, Z-1. MPPGCL Y ATPS, Chachai 17 220 Sidhi Feeder 09.09.13 14:01 09.09.13 14:15 Line tripped on A Phase to E/F, Zone-1. MPPGCL Y ATPS, Chachai 18 220 Sarni S/s Inter-Connector I 09.10.13 16:30 09.10.13 16:55 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 19 220 BRS- AMK 2 10.08.13 05:20 10.08.13 05:51 Line tripped on R phase fault, Z-1, DPR operated MPPGCL N SGTPS, Birsinghpur 20 220 Sarni - Handiya 10.09.13 09:50 10.09.13 10:17 Line tripped on R Phase to E/F. MPPGCL N STPS, Sarni 21 220 BRS- AMK 3 10.10.13 21:04 10.10.13 21:19 Line triped on R phase fault, Z1, DPR operated MPPGCL N SGTPS, Birsinghpur 22 220 Sarni S/s Inter-Connector I 10.10.13 15:25 10.10.13 15:52 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 23 220 Birsinghpur Feeder 2 11.08.13 05:25 11.08.13 05:51 Line tripped on A Phase Fault, Zone-1, DPR optd. MPPGCL Y ATPS, Chachai 24 220 BRS- AMK-3 11.10.13 21:04 11.10.13 19:29 Line triped on R phase fault, Z1. MPPGCL N SGTPS, Birsinghpur 25 220 BRS- SATNA 11.10.13 12:55 11.10.13 13:22 Line triped on B phase fault, Z1, DPR operated MPPGCL N SGTPS, Birsinghpur 26 220 BRS- AMK 2 12.08.13 17:54 12.08.13 18:27 Line tripped on R phase fault, Z-1. MPPGCL N SGTPS, Birsinghpur 27 220 Jabalpur Feeder No.I 12.08.13 22:45 12.08.13 22:58 Line tripped on C Phase Fault, DPR optd. MPPGCL Y ATPS, Chachai 28 220 BRS- Satna 12.08.13 21:02 13.08.13 12:49 Line tripped on Y phase fault, Z-1. MPPGCL N SGTPS, Birsinghpur 29 220 BRS- SATNA 12.10.13 11:10 12.10.13 11:32 Line triped on B phase fault, Z1. MPPGCL N SGTPS, Birsinghpur 30 220 Sarni S/s Inter-Connector I 12.10.13 16:44 12.10.13 17:00 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 31 220 Sarni - Handiya 14.09.13 12:50 14.09.13 13:32 Line tripped on R&Y Phase fault. MPPGCL N STPS, Sarni 32 220 Sarni S/s Inter-Connector I 14.09.13 12:50 14.09.13 13:32 Line tripped on R Phase to E/F. MPPGCL N STPS, Sarni 33 220 BRS- Satna 15.09.13 16:40 15.09.13 16:51 Line tripped on R phase to Earth Fault, DPR operated, Zone-1 & Zone-2. MPPGCL N SGTPS, Birsinghpur 34 220 Sidhi Feeder 15.09.13 14:49 15.09.13 15:23 Line tripped on A Phase fault, Zone-1. MPPGCL Y ATPS, Chachai Provision of A/R Name of the Substation

35 220 Sidhi Feeder 15.09.13 16:40 16.09.13 12:39 Line tripped on A Phase to E/F, Zone-1. MPPGCL Y ATPS, Chachai 36 220 Sarni S/s Inter-Connector I 15.10.13 14:10 15.10.13 14:26 Tripped with E/F relay on Y phase from PH end. MPPGCL N STPS, Sarni 37 220 BRS- AMK 2 16.08.13 01:17 16.08.13 02:01 Line tripped on B phase fault, Z-1, Dist. 83.4 Km from Amk end. MPPGCL N SGTPS, Birsinghpur 38 220 BRS- AMK 3 16.10.13 21:04 16.10.13 02:49 Line triped on R phase fault, Z1, DPR operated MPPGCL Y SGTPS, Birsinghpur 39 220 Jabalpur Feeder No.2 16.10.13 12:49 16.10.13 13:08 Line tripped on C phase fault MPPGCL Y ATPS, Chachai 40 220 Sidhi Feeder 17.09.13 05:09 17.09.13 05:31 Line tripped on A Phase to E/F, Zone-1. MPPGCL Y ATPS, Chachai 41 220 BRS- AMK 2 18.09.13 21:26 18.09.13 21:54 Line tripped on R Phase fault, Zone-2 MPPGCL N SGTPS, Birsinghpur 42 220 Traction No.2 18.10.13 11:35 18.10.13 12:03 Line tripped on R Phase fault, Z-1 MPPGCL Y ATPS, Chachai 43 220 Sarni Handiya 19.10.13 12:02 19.10.13 12:12 Tripped with E/F relay on Y phase from Ph end. MPPGCL N STPS, Sarni 44 45 220 Sarni S/s Inter-connector-I 20.08.13 14:30 20.08.13 20:16 220 Sarni S/s Inter-connector-II 20.08.13 14:30 20.08.13 20:19 Interconnector No.1 tripped due to transient R Phase to earth fault. Interconnector No.2 tripped due to transient R Phase to earth fault. MPPGCL N STPS, Sarni MPPGCL N STPS, Sarni 46 220 BRS- Satna 23.09.13 07:55 23.09.13 08:11 Line tripped on B Phase fault, DPR Operated, Zone-1. MPPGCL N SGTPS, Birsinghpur 47 220 BRS-AMK 3 23.11.13 21:04 23.11.13 21:19 Line tripped on R Phase fault, Z1, 111 Km from Katni end MPPGCL N SGTPS, Birsinghpur 48 220 Birsinghpur Feeder -3 24.11.13 12:25 24.11.13 12:50 Line tripped on A phase fault, Z-2, DPR operated. MPPGCL Y ATPS, Chachai 49 220 BRS- AMK 2 25.08.13 17:16 26.08.13 15:17 Line tripped on B phase fault from Birsinghpur end.. MPPGCL N SGTPS, Birsinghpur 50 220 Sukha Feeder 25.10.13 16:27 25.10.13 16:32 Line tripped on B phase fault. MPPGCL Y ATPS, Chachai 51 220 Sidhi Feeder 25.11.13 02:23 25.11.13 03:32 Trip ABC, Z-1, Z-2 MPPGCL Y ATPS, Chachai 52 220 BRS- Satna 26.08.13 04:50 26.08.13 05:34 Line tripped on R phase fault, Z-1, Dist. 151.7Km from Satna end. MPPGCL N SGTPS, Birsinghpur 53 220 Jabalpur Feeder No.2 27.08.13 14:19 27.08.13 14:40 Line tripped on C Phase Fault, Zone-1. MPPGCL Y ATPS, Chachai 54 220 Sukha Feeder 27.09.13 13:55 27.09.13 14:30 Line tripped on A Phase fault, DPR Operated, Zone-1. MPPGCL Y ATPS, Chachai 55 220 Sidhi Feeder 27.11.13 22:47 27.11.13 23:02 Line tripped on A phase fault, Z-1, DPR operated. MPPGCL Y ATPS, Chachai 56 220 Jabalpur Feeder No.1 28.08.13 00:55 28.08.13 01:08 Line tripped on C Phase Fault, DPR optd. MPPGCL Y ATPS, Chachai 57 220 BRS-Sukha Feeder 28.11.13 02:10 28.11.13 02:39 Line tripped on Y Phase to earth fault, Z1, 159 Km from Birsinghpur end MPPGCL N SGTPS, Birsinghpur 58 220 BRS- SATNA 29.10.13 05:00 29.10.13 05:25 Line triped on B phase fault, Z1. MPPGCL N SGTPS, Birsinghpur 59 400 Sarni- I.S.P Line 03.08.13 11:44 05.08.13 10:17 Line tripped on R Phase fault, Z-1, 37.5% from Sarni end. MPPGCL Y STPS Sarni 60 61 62 63 400 Birsinghpur-Katni -II Feeder 03.11.13 17:02 06.11.13 07:32 400 Sarni- Koradi Line 06.08.13 23:21 07.08.13 19:48 400 Sarni- Koradi Line 07.08.13 23:48 19.08.13 09:20 400 Birsinghpur-Katni -II Feeder 08.11.13 04:10 12.11.13 08:45 Line tripped on Over voltage due to direct trip received from Katni end. Line tripped on over voltage due to direct trip received from Koradi end. Line tripped on overvoltage due to carrier received from Koradi end. Line tripped on Over voltage due to direct trip received from Katni end. MPPGCL Y SGTPS, Birsinghpur MPPGCL Y STPS Sarni MPPGCL Y STPS Sarni MPPGCL Y SGTPS, Birsinghpur 64 400 Sarni- Koradi Line 10.09.13 13:15 10.09.13 13:51 Line tripped due to direct trip received from Koradi end. MPPGCL Y STPS Sarni 65 66 400 Birsinghpur-Katni -II Feeder 13.10.13 13:32 13.10.13 17:15 400 Birsinghpur-Katni -II Feeder 15.11.13 21:50 20.11.13 15:32 Line tripped on Overvoltage due to Carrier received at Birsinghpur. Line tripped on Over voltage due to direct trip received from Katni end. MPPGCL Y SGTPS, Birsinghpur MPPGCL Y SGTPS, Birsinghpur

67 400 Sarni- Itarsi Line 17.08.13 11:05 17.08.13 11:25 Line tripped due to carrier received from Itarsi end. MPPGCL Y STPS Sarni 68 400 Sarni- I.S.P Line 19.10.13 14:05 19.10.13 16:08 Line tripped on Y phase fault, 41 per centage from Sarni end. MPPGCL Y STPS Sarni 69 400 Sarni- Itarsi Line 20.08.13 14:10 20.08.13 15:07 Line tripped due to carrier received fromsarni end. MPPGCL Y STPS Sarni 70 71 72 73 400 Sarni- Koradi Line 20.08.13 02:44 30.08.13 21:16 400 Birsinghpur-Katni -II 20.09.13 14:16 - - 400 Birsinghpur-Katni -II 21.11.13 21:41 01.12.13 05:45 Line tripped on over voltage due to direct trip received from Koradi end. Line tripped on O/V due to DT received from Katni end. Feeder not charged upto 30.9.13 as per system requirement. Line tripped on Over voltage due to direct trip received from Katni end. MPPGCL Y STPS Sarni MPPGCL Y SGTPS, Birsinghpur MPPGCL Y SGTPS, Birsinghpur 400 Sarni- I.S.P Line 22.10.13 12:01 22.10.13 12:17 Line tripped on Y phase fault, 40.5 per centage from Sarni end. MPPGCL Y STPS Sarni 74 400 Sarni- I.S.P Line 27.09.13 12:37 27.09.13 18:44 Line tripped on R Phase fault MPPGCL Y STPS Sarni 75 400 Sarni- I.S.P Line 28.09.13 13:45 28.09.13 16:45 Line tripped on R Phase fault MPPGCL Y STPS Sarni 76 400 Sarni- I.S.P Line 29.09.13 12:00 29.09.13 18:35 Line tripped on overvoltage due to direct trip received from ISP end. MPPGCL Y STPS Sarni 77 400 Sarni- I.S.P Line 30.08.13 18:15 30.08.13 18:47 Line tripped on B phase fault. Fault from Sarni end. 99.9% MPPGCL Y STPS Sarni 78 400/220 I.C.T. 20.08.13 13:38 20.08.13 17:42 ICT tripped due to 220KV side B phase Back up instantaneous O/C protection operated. 79 220 Budhipadar- Korba (E) 22.10.13 10:03 22.10.13 10:18 Line tripped due to Bus fault at Korba (east) end WR I 80 81 82 83 84 400 Parli-Wardha # 2 2.9.13 09:47 2.9.13 12:00 400 Bhatapara-Bhilai 17.9.13 13:06 17.9.13 13:16 400 Bhadrawati -Raipur # 1 19.9.13 11:08 19.9.13 11:34 400 Bhatapara -Korba 3.10.13 12:58 3.10.13 13:28 400 Raigarh - SEL # 2 13.10.13 04:19 13.10.13 05:01 Line tripped on R-Y Phase fault. Fault location 121km from Wardha end. Line tripped due to R-e fault,f.l=52.6km from Bhilai end, 29km from Bhatapara Line tripped due to Spurious signal, PLCC maloperated at Raipur Line tripped due to Yph- e fault Insualtor string falshover heavy raifall & lightning at site. Line tripped due to Bph-E. fault in LILO portion of M/S SEL ltd. Fl= 18km from SEL, 101km from Raigarh 85 400 DB Power-KSK 13.10.13 08:09 13.10.13 09:47 Line tripped due to DT sent from DBPL end WR I 86 400 DB Power-Raigarh 13.10.13 08:09 13.10.13 09:35 Line tripped due to DT sent from DBPL end WR I 87 88 89 90 91 92 400 Bhadrawati - Chandrapur # 1 27.10.13 10:45 27.10.13 13:14 400 Bhadrawati - Chandrapur # 2 27.10.13 10:45 27.10.13 13:52 Line tripped due to bus-bar protection operation at MSECTL Chandrapur. Line tripped due to bus-bar protection operation at MSECTL Chandrapur. 400 Bhilai -Korba # 1 29.10.13 12:03 29.10.13 12:18 Line tripped due to Busbar protection operated at Korba end. WR I 400 Bhilai-Koradi 30.10.13 03:21 30.10.13 03:26 400 Akola-Wardha # 1 13.11.13 12:50 13.11.13 14:31 765 Bilaspur-Seoni # 1 15.9.13 15:33 15.9.13 16:01 Line A/R successful at Bhilai end but tripped at Koradi end on Y ph- E fault. F/L=40.24Km from Bhilai end. Line tripped on Y-E fault Yph Insulator D-capped at loc. no. 206. Line tripped due to Yph-e fault F.L=190KM from Bilaspur & 142km frpm Seoni end. 93 400 Seoni-Khandwa I 01-08-13 00:46 01-08-13 00:56 A/T on Operation of O/V Protection at Khandwa WR II 94 400 Mundra-Limbdi I 04-08-13 18:34 04-08-13 20:38 A/T from Limdi (GETCO) end only due to ingress of moisture in CB housing. MPPGCL Y STPS, Sarni WR I WR I WR I WR I WR I WR I WR I WR I WR I WR I WR II

95 400 Vindhyachal-Jabalpur I 05-08-13 05:36 05-08-13 05:36 A/R successfully from both sides on Y-E Transient Fault WR II 96 400 Vindhyachal-Jabalpur II 05-08-13 05:36 05-08-13 05:36 A/R successfully from both sides on Y-E Transient Fault WR II 97 400 Vindhyachal (NTPC) -Sasan (Reliance) 08-08-13 14:44 08-08-13 14:44 A/R successfully at SASAN end only on R-ph to E/F. A/R failed at VSTPP (NTPC) end 98 400 Nagda-Dehgam I 08-08-13 16:38 09-08-13 17:05 A/T on B-E Fault due to Insulator Flashover. WR II 99 400 Jabalpur-Itarsi II 13-08-13 03:58 13-08-13 07:18 A/T on operation of O/V Protection I at Itarsi WR II 100 400 Vindhyachal-Jabalpur I 13-08-13 03:58 13-08-13 04:03 A/T on operation of O/V Protection at Jabalpur WR II 101 400 Indore-Asoj II 15-08-13 16:25 15-08-13 16:25 A/R successfully from both ends on on B-E transient fault WR II 102 400 Seoni-Khandwa I 19-08-13 02:40 19-08-13 02:50 A/T on operation of O/V protection at Khandwa WR II 103 400 Vindhyachal - Nigrie 19-08-13 10:13 19-08-13 11:04 A/T on D/T recived from Nigrie JP power Plant. WR II 104 400 Satna-Bina(PG) II 21-08-13 13:52 21-08-13 15:20 A/T on operation of Reactor PRV due to entry of lizard in PRD housing at Bina 105 400 Vindhyachal-Jabalpur II 22-08-13 11:54 22-08-13 12:57 A/T due to receipt of Direct Trip from VSTPP (NTPC) end. WR II 106 400 Nagda-Dehgam II 24-08-13 05:18 24-08-13 05:28 A/T on operation of O/V Protection at Nagda (MPPTCL) S/S. WR II 107 400 Vindhyachal-Jabalpur I 25-08-13 15:22 25-08-13 19:50 A/T on operation of O/V Protection at Jabalpur WR II 108 400 Damoh-Birsinghpur I 15-09-13 16:22 15-09-13 16:59 A/T due to Y-E (persisting fault) WR II 109 400 Mundra-Jetpur II 21-09-13 12:02 21-09-13 12:16 A/T due relay mal-operation at Mundra (CGPL) WR II 110 400 Seoni-Khandwa I 21-09-13 13:03 21-09-13 19:14 A/T on operation of O/V protection at Khandwa WR II 111 400 Nagda-Dehgam II 21-09-13 18:42 21-09-13 19:07 A/T due to transient R-N fault (Insulator flashover). WR II 112 400 Mundra-Limbdi II 26-09-13 08:17 26-09-13 12:06 A/T due to Bus fault at Limbdi S/S( GETCO) WR II 113 400 Vindhyachal-Jabalpur I 26-09-13 09:45 26-09-13 09:55 A/T tripped on DT send from Jabalpur due to DC earth leakage. WR II 114 400 Itarsi-Indore II 30-09-13 18:33 30-09-13 19:21 A/T due to maloperation of bus bar at Indore(MPEB) WR II 115 400 Indore-Asoj II 30-09-13 18:33 30-09-13 20:30 A/T due to maloperation of bus bar at Indore(MPEB) WR II 116 400 Nagda-Dehgam i 06/10/13 19:23 06/10/13 19:23 A/T due to transient R-N fault (Insulator flashover) WR II 117 400 Vindhyachal-Jabalpur IV 07/10/13 05:18 07/10/13 05:18 A/R successfully on B-E transient fault WR II 118 400 Seoni-Khandwa I 13/10/13 02:15 13/10/13 02:25 A/T on operation of O/V protection at Khandwa WR II 119 400 Indore-Asoj II 22/10/13 19:22 22/10/13 19:22 A/R successfully on Y-E transient fault WR II 120 400 Damoh-Bhopal II 08/11/13 18:50 08/11/13 21:20 A/T on Y-E (transient fault) WR II 121 400 Mundra-Jetpur II 14/11/13 17:47 14/11/13 18:16 A/T on operation of O/V protection at Mundra WR II 122 400 Vindhyachal-Satna I 14/11/13 19:41 14/11/13 19:41 A/R successfully on R-E transient fault WR II 123 400 Shujalpur-Nagda I 18/11/13 07:10 18/11/13 07:53 A/T due to operation of Busbar protection at Nagda. WR II 124 400 Bhachau-Ranchodpura I 21/11/13 19:56 21/11/13 20:06 A/T on operation of O/V protection at Bhachau WR II 125 400 Damoh-Birsinghpur II 23/11/13 18:24 23/11/13 19:28 A/T due to operation of Reactor Differential protection at Damoh 126 400 Jabalpur-Itarsi II 30/11/13 14:38 30/11/13 14:53 A/T on B - E (persisting Fault) WR II 127 765 Sasan-Satna I 19-08-13 14:00 19-08-13 14:46 A/T due to mal-operation of Reactor REF protection at Satna end. 128 765 Bina (PG) -Indore I 23-08-13 02:45 23-08-13 02:55 A/T on operation of O/V Protection at Indore WR II WR II WR II WR II WR II

129 765 Bina-Indore 04-09-13 12:59 04-09-13 13:09 A/T on operation of O/V protection at Indore. WR II 130 765 Bina-Indore 20-09-13 13:02 20-09-13 13:32 A/T on operation of O/V protection at Indore. WR II 131 765 Bina-Indore 24-09-13 02:32 24-09-13 09:45 A/T on operation of O/V protection at Indore. WR II 132 765 Bina-Indore 25-09-13 04:02 25-09-13 04:12 A/T on operation of O/V protection at Indore. WR II 133 765 Bina-Indore 28-09-13 17:02 28-09-13 17:12 A/T on operation of O/V protection at Indore. WR II 134 765 Bina (pg) -Indore I 08/10/13 04:01 08/10/13 04:11 A/T on operation of O/V protection at Indore. WR II 135 765 Agra-Gwalior I 20/10/13 19:50 20/10/13 20:16 A/T on operation of O/V protection at Agra. WR II 136 765 Bina (pg) -Indore I 27/10/13 03:04 27/10/13 03:14 A/T on operation of O/V protection at Indore. WR II 137 765 Bina-Indore 11/11/13 19:06 11/11/13 19:16 A/T on operation of O/V protection at Indore WR II 138 765 Seoni-Bina I 26/11/13 21:48 26/11/13 21:58 A/T due to operation of O/V protection at Bina WR II 139 400/220 ICT I Satna 08/11/13 10:25 Still out _ A/T due to failure of 220kV side Y-ph bushing WR II 140 220 Gadchandur-Virur ckt. No.-1 13.08.2013 4.3 13.08.2013 5.10 R,Y,B phase pickup, general trip MSETCL 141 220 Gadchandur-Virur ckt. No.-2 13.08.2013 5.13 13.08.2013 20:20 R & E phase pickup, zone 2, general trip MSETCL 142 220 Virur-Gadchiroli ckt. 13.08.2013 4.30 13.08.2013 5.12 R & E phase pickup, VT fuse failed MSETCL 143 220 Gadchandur-Grace ckt. 13.08.2013 4.30 13.08.2013 5.25 Directional IDMTL earth fault relay 67N- 1flag MSETCL 144 220 220kV TSS Ckt. No. I 31.10.2013 16:00 31.10.2013 23:00 O/C, E/F Prot. MSETCL 145 220 220kV HGT-WRR Line 31.10.2013 16:00 31.10.2013 16:39 O/C E/F Prot. Relay MSETCL 146 220 220/132kV, 100 MVA ICT. II 31.10.2013 16:00 31.10.2013 16:40 RET 67- Start LED, Master trip relay, Back Up Relay MSETCL 147 220 220kV HGT-B'GOAN Line 31.10.2013 16:00 31.10.2013 16:30 Distane Relay: i) Y ph, ii) Zone 2, iii) A/R block MSETCL 148 220 220kV TSS Ckt. No. II 31.10.2013 16:49 31.10.2013 17:19 Tripping Back Up Relay O/C, E/F & LBB Prot. MSETCL Gadchandur Gadchandur Gadchandur Gadchandur Hinganghat Hinganghat Hinganghat Hinganghat Hinganghat

Format for Collecting information in regard to implementation of Recommendation of the Enquiry Committee. FORMAT -1 (PROTECTION AUDIT) Agency for furnishing information. Recommendation 9.1.1: There is a need to review protection schemes. This Committee concurs with recommendation of previous enquiry committee that a throrough third party protection audit need to be carried out in time bound manner. This exercise should be repeated periodically and monitored by RPC's. Action : RPCs, CTU, STUs. (D)Target date for completion of audit. (E ) No. of S/S where deficiencies detected. WR Constituent (A) Total No. of S/S in region. (B) No. of S/S identified for audit. ( C) No. of S/S yet to be audited 132 kv 220 kv 400 kv 765 kv HVDC Total 132 kv 220 kv 400 kv 765 kv HVDC Total 132 kv 220 kv 400 kv 765 kv HVDC Total Maha 119 119 0 NA NA Guj 47 81 11 0 0 139 47 74 0 0 0 121 11 19 11 0 0 52 October -2013 for 132 & 220 kv 36+55 = 91 CG MPPGCL 9 4 2 0 0 15 9 4 2 0 0 15 01-05-2014 NA MPPTCL 54 5 59 54 5 59 31-12-2013 OSP 1 1 1 1 30-09-2013 ISP 1 1 1 1 30-09-2013 MP Total 9 59 9 0 0 76 0 0 0 0 0 0 9 59 9 0 0 76 WR-I (PG) 0 0 8 3 1 0 0 8 3 1 0 0 0 0 0 0 NA NA WR-II (PG) 11 3 0 14 11 3 0 14 11 3 14 NA 4 WR-I (NTPC) WR-II (NTPC) Total (F) Action plan (on observation of third party protection audit) finalization date/target date for finalizing plan (G) Detail of S/S where no procuremnet is required for removal of deficiencies. No. of S/S Target date for removal of deficiencies (H) Detail of S/S where procurement is required. No. of SS Target date of removal of deficiencies. (I) Reason/remarks for rectification of deficiencies requiring period of more than one year. (J) Cost estimates for removal of deficiencies. 132 kv 220 kv 400 kv 765 kv HVDC S/S Total 132 kv 220 kv 400 kv 765 kv HVDC S/S Total 132 kv 220 kv 400 kv 765 kv HVDC S/S Total Maha NA NA NA NA NA Guj CG MP WR-I (PG) NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA WR-II (PG) 2 3 5 WR-I (NTPC) WR-II (NTPC)

FORMAT -2 ( REVIEW OF ZONE - 3 PHILOSOPHY) Recommendation 9.1.2: Till protection audit is taken up, there is a need to take immediate review of zone 3 philosophy in paticular. Techniques are available to modify characteristics of the relay so that it can distinguish between load encroachment and faults. These techniques and other alternatives should be explored immediately. Action : RPCs, CTU, STUs.: Time frame : WRPC Total No. of S/S at 220 kv & above (132 KV & above in NER states, J&K, Uttarakhand, HP, Sikkims, etc) No. of sub-stations covered at each voltage level. No. of S/S where revised Z- III setting have been implemented. Month and year by when revised Z-III settings would be implemented at remaining substation. Constituent \ kv 765 400 220 Total 765 400 220 Total 765 400 220 Total 765 400 220 Total Maha Guj 92 92 92 NA CG MPPGCL 2 4 2 4 0 1 15.08.2013 MPPTCL 5 54 5 54 5 54 MP 7 58 7 58 5 55 WR-I (PG) 3 9 0 3 9 0 3 9 0 NA NA NA NA WR-II (PG) 14 14 14 WR-I (NTPC) WR-II (NTPC)

Format 3 S No. Constituent No. of PMUs installed Locations Details of existing PMUs No. of PMUs functional and time syndchronised Target date for making defective PMU functional Additional PMUs planned to be insatlled No. of PMUs Locations Target date for commissioning Total No. of PMUs in the State 1 Maha 15 35 50 2 Guj 0 25 25 3 CG 0 4 MP 0 5 WR-I (PG) 6 WR-II (PG) 8 8 7 WR-I (NTPC) 8 WR-II (NTPC) S No. Constituent Purpose of SPS 1 Maha 2 Guj 6 3 CG 4 MP 5 WR-I (PG) 6 WR-II (PG) 2 7 WR-I (NTPC) 8 WR-II (NTPC) SPS is already operational at present Trigger for SPS operation result of SPS operations (detailof load shedding/backing down) SPS under Implementation Details of SPS Being Planned / Under study Trigger for SPS Result of SPS Purpose operation operations Target date of Finalization of SPS Target date for commissioning of SPS Sr. No. (B) SPS already operational at present SPS Under implementation Target date of finalization of Purpose of SPS Trigger for SPS operation Result of SPS Details of SPS being planned / under study SPS operations Trigger for Result of SPS (details of load shedding Purpose SPS operation operations / backing down). 1 GETCO To restrict overloadding on 220 KV Ukai-Mota- D/C lines at Mota s/s Stage-1:-700 A, 5 Minutes. Stage-2 : 750 A, 6 sec. (It will cut off load of 66 KV System at 220 KV Mota and Ambheta S/s) Operated on 25.5.13 Recently on 26.06.13, 03.07.13, 10.07.13. To restrict overloadding of 220 KV D/C KAPP-Vapi line Under planning NA Target date of commissionin By end of By end of October-2013 October-2013

2 GETCO To restrict loading of Stage: 240 A, 5 Sec. 3 nos. of 100 MVA 220/66 KV (It will cut of load of 66 KV transformers at Bhilad Bhilad-Silvasa-1 & 66 KV s/s. Bhilad-Silvasa-2) Not operated Yet. To restrict overloadding of 400 KV S/C Hadala- Jetpur & 400 KV Hadala -Chorania Under planning NA By end of By end of October-2013 October-2013 3 GETCO To restrict overloadding on 220 KV Amreli- Savarkundla D/C lines Stage-1:-660 A,10 Sec. Stage-720 A, 1 sec. (It will cut off load of 66 KV System at 220 KV Savarkundla S/s) Operated on 31.08.2013. 4 GETCO To restrict overloading Stage : 400 A, 5 Sec. of 400/220 KV 315 MVA ICT at 400 KV Amreli (It will cut of load of 66 KV S/s feeders at 400 KV Amreli s/s) Not operated Yet. 5 GETCO 6 GETCO To restrict the loading on 150 MVA, 220/132 KV ICT at 400 KV Asoj S/s in case of the sudden loss of GIPCL generation. To restrict the loading on 220/132 KV transformers at 220 KV Jambuva S/s in case of the sudden loss of GIPCL generation. Setting HV current :- 360 A Rated HV Current: 394 A (It will trip 132 KV Asoj- Manjusar line no. 1 &2. Commissioned on 23/7/13 Setting HV current :- 231 A Rated HV Current: 262 A (It will trip 132 KV Karjan, Tilakwada. 66 KV Dabhoi, 66KV Tarsali 1 &2) Commissioned on 29/7/13 Operated on 23.08.2013. Not operated Yet. 7 GETCO To restrict loading of 220 KV Hadala- Nyara 1 & 2 line at Nyara s/s Setting 720 A, 1 sec. It will trip breaker of 220 KV Kangashiyali feeder. Not operated Yet. 8 GETCO To restrict overloading of 400/220 KV ICT at 400 KV jetpur S/s Alarm Setting : 408 A, 1 sec. Tripping setting : 430 A, 5 sec. (It will trip 66 KV feeders at 400 KV Jetpur S/s.) Not operated Yet. 9 GETCO To restrict overloading of 400/220 KV ICT at 400 KV Asoj S/s Setting : 650 A, 5 Sec. (It will shed 66 KV feeders at Jambuva & Chandrapura S/s using direct trip command.) Not operated Yet.

10 GETCO To restrict overloading of 400 KV D/C APL- Sami-Dehgam lines without FSC. Stage-1:- 500 MW, 10 Sec - Alarm Stage-2:- 650 MW, 03 Sec - Tripping of APL Unit No. 3 or 4 Stage-3:- 750 MW, 01 Sec - Tripping of one 660 MW Unit. Most of the time, these lines remain in service with FSC only. 11 GETCO To restrict overloading of 400 KV D/C APL- Sami-Dehgam lines with FSC. Stage-1:- 500 MW, 10 Sec - Alarm Stage-2:- 750 MW, 03 Sec - Tripping of APL Unit No. 3 or 4 Stage-3:- 800 MW, 01 Sec - Tripping of one 660 MW Unit. Operated successfully many times. Recently operated on 01.06.13 tripping APL Unit No. 4 (running at 235 MW) 12 GETCO To restrict overloading of 400 KV APL-Varsana & 400 KV APL-Hadala lines Stage-1:- 500 MW, 10 Sec - Alarm Stage-2:- 750 MW, 03 Sec - Tripping of APL Unit No. 3 or 4 Stage-3:- 850 MW, 01 Sec - Tripping of one 660 MW Unit. 13 GETCO To restrict overloading of 220 KV D/C APL- Nanikhakhar & 220 KV D/C APL-Tappar lines Stage-1:- 500 A, 05 Sec - SPS has operated Alarm successfully. Stage-2:- 550 A, 02 Sec - Tripping of any one 400/220 KV, 315 MVA ICT at APL Stage-3:- 605 A, 05 Sec - Generation backing down. Stage-4:- 670 A, 02 Sec - Tripping of APL Unit No. 1 or 2. 14 WR II 15 WR II 16 SPS at LANCO- Pathadi Gwalior S/S - 765kV Gwalior-Agra ckt.1 & 2 - For Load Shedding in Northern Region Gwalior S/S - 220kV Gwalior(PG)-Gwalior(MP) & Malanpur-For Tripping of 220kV Lines at Gwalior (PG) S/s in case of tripping of 765kV lines When 400kV Pathadi- Raipur trips, I unit of 300MW of LANCO has to be tripped. commissioned in Aug 2010 M/s LANC

17 18 19 SPS at JPL- Tamnar SPS at APL- Mundra SPS at HVDC, APL,Mundra If one ckt of 400kV Tamnar-Raipur trips, iunit of 250MW will trip and other 3 units would reduce by 60MW as one coal mill trips. When DCPP units are on bar, 220kV DCPP- JPL line will also trip. Details of the scheme at 400kV and 220kV are given as Annex-I Details of the scheme are given as Annex-II Sudden reduction of import by NR due to 20 tripping of Agra-Gwalior SPS for tripping I& II, a total of 500MW of Agra-Gwaliorbacking down in Western Bina lines Region automatically in Korba,Vindhyachal,Sipat, CGPL & JP Bina. If 400kV Balco- Birsighpur trips, Balco to reduce generation to 21 SPS at BALCO 100MW. If 400kV Balaco-Birsinghpur flow is more than 550MW, Balco to reduce generation by 100MW. 22 23 SPS at Korba Complex SPS at 765kV Sipat Power Station Total flow on Korba(E)- Raigarh + Korba(W)- Kotmikla<525MW. Details given in Annex-III. Tripping of 765kV Seoni- Bilaspur D/C. Details given in Annex-III commissioned in Sept 2011 commissioned in Aug 2011 commissioned in July12 24 SPS for CGPL In Annex-IV Proposed CGPL 25 SPS for Wardha Flow gate Proposed Proposed Proposed Proposed Proposed M/s JPL M/s APL M/s APL POWERG M/s BALC CSPTCL NTPC MSETCL Maha rastra S. NO. Voltage (kv) PMU Location 1 400 Chandrapur 2 400 Bhusawal 3 400 New Koyna 4 400 Padghe 5 400 Dhule

6 400 Kalwa 7 400 Kolapur 8 400 Aurangabad 9 400 Lamboti 10 400 Lonikand 11 400 Girwali 12 220 Trombay 13 220 Eklahare 14 220 Boisar WR II No. of PMUs Location No. of units functional & Time Synchronised Target date to Make defective PMUs functional 1 1 Satna 1 Under Operation 2 3 Itarsi 3 Under Operation 3 2 Jabalpur 2 Under Operation 4 1 Dehgam 1 Under Operation 5 1 Vapi 1 Under Operation

Format - 4 (Enabling UFR and df/dt relay) Action: STUs, RPCs, Posoco, Time frame: immediate A. State wise details of UFR (as on date ) RPC (State) Total No. of UFRs installed No. of UFRs functional No. of UFRs nonfunctional Maha 272 271 1 Guj 149 145 3 CG MP 278 278 0 OSP 13 13 0 12 12 0 WR-I (PG) WR-II (PG) WR-I (NTPC) WR-II (NTPC) action being taken to make them functional Defective relay being replaced OEM is contacted for repairing scheme month and year to complete the remedial action 15-10-2013 B. RPC (State)State wise details of df/dt (as on date ) Details of additional UFRs under implementation/planned No. Target date of commissioning Total No. of df/dt relayss installed No. of df/dt relays functional No. of df/dt relays nonfunctional action being taken to make them functional Month and year to complete the remedial action Details of additional df/dt relays under implementation/planned No. Target date of commissioning Maha 30 30 Guj 149 145 6 OEM is contacted for repairing scheme CG MPPGCL 32 32 0 1 Oct-13 OSP 13 13 0 ISP 12 12 0 MP 57 57 0 1 WR-I (PG) WR-II (PG) WR-I (NTPC) WR-II (NTPC)

Format -5 Real time Security Desk POSOCO Details of real time security desk at each RLDC and NLDc Provided in WRLDC control room Action: Posoco, Time frame: 6 months Details of outage scenarios built to be used by despatcher in real time for revising TTC calculations Status of development of faster algorithm for for real time updation of TTC calculations by load despatcher under outage conditions

FORMAT - 6 (ADUIT OF HVDC, TCSC SVC AND PSS TUNING) Maha Guj CG MP WR-I (PG) WR-II (PG) WR-I (NTPC) WR-II (NTPC) Recommendation: 9.9.2.: An audit of devices such as HVDC, TCSC, SVC and PSS should be done immediately to enusre that their stability features are enabled. Further exercise of PSS tuning should be planned and implemented. Settings of these dynamic stabilizing devices should be reviewed at appropriate intervals. Action : CTU, STUs, Generators: Time Frame : 6 months. (A) Audit of HVDC Location of HVDC BHADRAVATI HVDC Back to Back Audit status (completed on dd/mm/yyyy) rvations of the aduit and the name of audit ag Action plan with timeline to remove deficiencies as per audit. 22.01.2013 WR-II and WRLDC Representative No discrepancy Found. Location of TCSC (B) Audit of TCSC Audit status (completed on dd/mm/yyyy) rvations of the aduit and the name of audit ag Action plan with timeline to remove deficiencies as per audit. Maha Guj CG MP WR-I (PG) Raipur TCSC 06.02.2013 WR-II and WRLDC Representative No discrepancy Found. WR-II (PG) WR-I (NTPC) WR-II (NTPC) Location of SVC Audit status (completed on dd/mm/yyyy) rvations of the aduit and the name of audit ag Action plan with timeline to remove deficiencies as per audit. Maha Guj CG MP WR-I (PG) NA NA NA NA WR-II (PG) WR-I (NTPC) ( C) Audit of SVC

WR-II (NTPC) RPC (state wise) Name and Location of generator identified for PSS tuning. Audit status (completed on dd/mm/yyyy) (D) Status of PSS Tuning ction plan with time line to complete PSS tuning. Maha 23 Guj CG MP OSP 1 ISP 1 WR-I (PG) NA NA NA NA WR-II (PG) WR-I (NTPC) WR-II (NTPC) Constituents Station Unit No. Capacity (MW) Gujarat Wanakbori TPS 1 210 Wanakbori TPS 3 210 Chattisgarh Korba (W) TPS 1 210 Korba (W) TPS 3 210 Korba (W) TPS 2 210 Madhya Pradesh Satpura STPS 8 210 Satpura STPS 9 210 SGTPS Birsinghpur 1 210 SGTPS Birsinghpur 2 210 SGTPS Birsinghpur 3 210 SGTPS Birsinghpur 4 210 Maharashtra Nasik TPS 3 210 Nasik TPS 5 210 Parli TPS 2 210 Parli TPS 3 210 Parli TPS 4 210 NTPC Korba STPS 2 210 Korba STPS 3 210 Korba STPS 4 210 Korba STPS 5 500 Korba STPS 6 500 REL Dahanu TPS 1 250 Dahanu TPS 2 250

Format-7 Voltage collapse prediction relay Action: RPCs, Time Frame: 1 year Status of exploration of voltage collapse prediction relay WRLDC In Boisar, A-eberle collapse prediction relay was installd on 17.10.2012 as a demo project. Currently, offline analysis is carried out by WRLDC regularly and exploring the opportunities to integrate with real time visualization software

Format-8 Telemetry facilities POSOCO (Region/State/ CPSU wise) GETCO MPPTCL MSETCL CSPTCL Goa DD DNH Total Name and location of Generating station / transmission element without telemetry facility 17 8 54 1 1 1 2 84 Action: RPCs, Posoco, Time frame: 6 months Fault in telemetry / reason for non-availability of telemetry Nature of communication link for required telemetry in column (A) (Micro wave /fibre/plcc etc..,) Action plan with time line to operatiionalize the required telemetry facility

STATUS OF OPERATION OF POWER STATIONS UNDER FGMO/RGMO As on Format-09 Name of Region: Description Total No. units/station s in the region Units required co Units operate under RGMO/FGMO as per IEGC operating under RGMO Units operating in FGMO with manual intervention to archive RGMO Total No. of units under FGMO/RGMO (4+5) Units Exempted from FGMO/ RGMO by CERC Units applied to CERC for exemption/ extension Units operating with locked governors Units whose status is not available Remarks especially regarding entries, if any, in column (9) or (10) 1 2 3 4 5 6 7 8 9 10 11 No. of Units (CS) 47 29 18 18 5 6 No. of Units (SS) 254 126 29 29 8 89 No. of Units (Pvt sector) 90 42 37 37 0 5 No. of Stations (CS) 12 4 2 2 0 2 No. of Stations (SS) 83 46 10 10 2 34 No. of Stations (Pvt sector) 33 12 8 4 Installed capacity CS (MW) 16211 7810 5460 5460 250 2100 Installed capacity SS (MW) 29943 16155 4220 4220 540 11395 Installed capacity FS (MW) 20598 13916 12766 12766 0 1150 It has been reported that there are problems associated with governors of the units indicated in column 9

Annexure - 9.7.3 Lines which require NGR by pass scheme to connect line reactor as bus reactor when the line is kept out. 400 kv Lines Equipment Owner Line reactor at End 1 Line Reactor at End 2 Akola-Aurangabad-1 PGCIL 50 50 Akola-Aurangabad-2 PGCIL 50 50 Damoh-Bhopal 1 MPPTCL 50 Damoh-Bhopal 2 MPPTCL 50 Indore-Asoj 1 PGCIL 50 50 Indore-Asoj 2 PGCIL 50 50 Indore-Itarsi 1 PGCIL 50 50 Indore-Itarsi 2 PGCIL 50 50 Nagda-Dehgam 1 PGCIL 50 50 Nagda-Dehgam 2 PGCIL 50 50 Nagda-Sujalpur 1 PGCIL 50 Nagda-Sujalpur 2 PGCIL 50 Nagda-Rajgarh-1 MPPTCL 50 Nagda-Rajgarh-2 MPPTCL 50 Akola-Bhusawal S/c MSETCL 50 Chandrapur-Chandrapur II MSETCL 50 Chandrapur II-Parli 1 MSETCL 50 Chandrapur-Parli 2 MSETCL 50 50 Chandrapur-Parli 3 MSETCL 50 50 Karad Solapur (PG) MSETCL 50 Sub Total Total 16 14 30

GUJARAT ENERGY TRANSMISSION CORPORATION LIMITED Regd. Office: Sardar Patel Vidyut Bhavan, Race Course, VADODARA 390 007. Telephone No.(0265) 2353089 (D) Fax No.(0265) 2351218 (GETCO) / (0265) 2337918/2338164 (GUVNL) Web site: www.getcogujarat.com Email: cetr.getco@gebmail.com No. CE (TR)/ACE (Testing)/WRPC/11/1862 Date: 3/12/13 To, Superitending Engineer (Protection) Western Regional Power Committee F-3, MIDC area, Andheri (East) Mumbai-400 093 Sub. Providing high speed bus bar differential protection along with LBB at 132 KV and above voltage class. Dear Sir, GETCO has implemented bus bar protection schemes in 220 KV and above voltage class substations. The implementations of bus bar schemes are as per the CEA notifications, of dated 20 th August -2010, Schedule V, regulations 43(4) (c), attached herewith. [Para-1] The Chief Electricity Authority of Gujarat State has informed that high speed bus bar differential protection scheme with local breaker back up protection shall be commissioned and always be available at all 132 KV and above voltage class substations, switching stations, generating stations connected with grid. Provided that in respect of 132 KV substations and switching stations having more than one incoming feeders. The same is as per the CEA regulations 2013(book), chapter no. VI, clause no. 45 (2) (vii). [Para-2] At present, GETCO does not have bus bar protection scheme in all 132 KV class substations as per the guide lines mentioned in [Para-1]. Further, Western Region Protection Committee (WRPC) has not given any guidelines in same context. As per the regulations mentioned in [para-2], all existing 132 KV class substations are required to be provided with high speed bus bar differential protection scheme including local breaker back up scheme. It is further to state that existing 132 KV class substations are generally single bus stations. Even, zone wise isolation for bus fault may not be possible if space of sectional isolator/breaker was not available in the switchyard. Hence, whole substation shall be entered in to the dark during failure of operation of breaker (stuck breaker) or during bus fault. It is requested to guide in the matter, so further course of action shall be finalized. Thanking You, Yours Faithfully Sd/- (U.C.Patel) Chief Engineer (TR)