Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.4.5 Case Study-24: Validation of DR from 400 kV DadriThe DR received from 400 kV Dadri NTPC substation during the incident of bus-fault due to Y-Ph CT failure on 10 th July 2011 was compared with the synchrophasors data received fromDadri HVDC.Figure 80: Fluctuations in voltage at Dadri during generation loss at Dadri on 10th July 2011Figure 81: DR print from Mandaula and PanipatThe following inferences can be drawn from the above data:• There were two events, 1 st event at 13:55:01.720 hrs & 2 nd event at 13:55:03.720 hrs.• The fault in neutral remained for nearly 200ms during the 1 st event.POSOCO Page 88 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.4.6 Case Study-25: Validation of the operation time of SPSA System Protection Scheme (SPS) has been installed at NapthaJhakri Hydro station to trip oneor more generating units at Karcham Wangtoo in case of tripping of one or more evacuationfeeders from the complex. The SPS operated on 16 th July 2011 due to tripping of 400kV Jhakri-Abdullapur line-1. The running units at Karcham Wangtoo HEP tripped. The synchrophasorsdata captured during the event along with SCADA sequence of events and Disturbance record/Event logger from 400kV Abdullapur (P.G) substation & Karcham Wangtoo HEP were used tocompare the actual SPS operation time with the envisaged operation time.Table 9: Tripping time details of Jhakri-Abdullapur lineAbdullapur (P.G)SCADAAs inferredDisturbancesequence offrom PMU dataEventrecordEvents (SOE)at NRLDCTime of receipt of Direct trip atAbdullapurTime of opening of 400kVAbdullapur-Jhakri Main breakerTime of opening of 400kVAbdullapur-Jhakri Tie breaker04:28:57.330 04:28:57.30204:28:57.370 04:28:57.32604:28:57.371 04:28:57.3424:28:57.240Table No. 9 shows the 400kV Jhakri-Abdullapur line-2 tripping time obtained from Abdullapurend disturbace recorder, SCADA SOE & PMU data. It can be observed that circuit breakers of400kV Jhakri-Abdullapur line-2 tripped at 4:28:57.371 hrs which matches with the SCADA SOEand PMU data.Table 10: Tripping time details of Karcham Wangtoo stationEvent Karcham E.L NRLDC SOE NRLDC PMUTime of receipt of SPS signal atKarcham04:29:07.217 --- ---Tripping of unit -2 at Karcham 04:29:07.898 --- 04:29:07.800Tripping of unit -1 at Karcham 04:29:07.990 --- 04:29:07.800Table No.10 shows the tripping time of running units at Karcham Wangtoo HEP. It can beobserved that the units tripped at 4:29:07.800 hrs which closely matches with PMU data.POSOCO Page 89 of 143
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