Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Figure 73: df/dt observed at Vindhyachal with 160 ms plotFigure 74: df/dt observed at Vindhyachal with 200 ms plotHence based on the study the 12 th protection subcommittee meeting of Northern Regionrecommended increase the measuring cycle of df/dt relay to 8 to 10 cycles (i.e., 160 – 200millisecond) in-order to counter the initial transients in frequency during a fault. Afterimplementation of these recommendations the mis-operation of df/dt relays was significantlyreduced. The extract from minutes of 13 th Protection Subcommittee (PSC) meeting of NorthernRegional Power Committee (NRPC) held on 28 th January 2011 is as under:‘’SE (O) stated that it was decided in 12th PSC that the measurement time of df/dt relay shall be08 to 10 cycles. The members informed that the spurious tripping due to df/dt relay had notoccurred after change of setting.’’POSOCO Page 84 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.4.3 Case Study- 22: Validation of the DR / EL at Dulhasti HEPDisturbance Recorder (DR) and Event Loggers (EL) installed at the substations are triggeredduring operation of the protective system at the substation. The DR are supposed to be timesynchronized with the GPS to so as to infer the correct sequence of events during eventsinvolving multiple elements/substations. An incident of generation loss had occurred in DulhastiHydro station in Northern region during to tripping of evacuating line. From 400kV Vindhyachalvoltage plot (refer figure 75) it can be observed that a transient fault had occurred in B-phase at15:17:07.840 hrs.Figure 75: 400kV Vindhyachal voltage profile confirming transient fault in B phaseFigure 76: Snapshot of Dulhasti station Event loggerPOSOCO Page 85 of 143
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Synchrophasor Initiative in India - erldc

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