Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.1.3 Case Study-8: Multiphase fault at Khedar TPS on 5-Apr-2012Figure 51 shows 400kV Hisar bus voltage profile during the occurrence of a multiphase fault atKhedar TPS in Northern region. It can be observed that the 1 st fault in B-phase got cleared inaround 200ms. A second fault involving R & Y phase occurs 680milli second after occurrence of1 st fault. The second fault gets cleared in 120 milli seconds.Figure 51: Voltage profile corroborating the fault clearance time at HissarPOSOCO Page 64 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.1.4 Case Study-9: Tripping at 400kV Muradnagar & Moradabad on 29-May-2011Voltage profile at 400kV Kanpur Bus during incident of multiple tripping at 400kV Muradnagarand Moradabad Substations is shown in the figure 52. It can be observed that there is delayedfault clearance i.e., in 520 milli seconds which is much beyond the fault clearing time asmandated in the Indian Electricity Grid Code (IEGC). This indicates the clearing of fault in Zone-2 time of distance protection. The same was validated based on field information.Figure 52: Detection of delayed fault clearancePOSOCO Page 65 of 143
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Synchrophasor Initiative in India - erldc

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