Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.1.7 Case Study-12: Fault at 400kV Bareilly on 2-Jan-2011Voltage profile of 400kV Kanpur bus during occurrence of fault at 400kV Bareilly (UPPTCL)substation in Northern region is shown in figure 55. It can be interpreted that there is an initialfault in R-phase, the dip in voltage does not recover fully and remains for around 20 secondswhich is much beyond the fault clearing time mandated IEGC. Then there is a 2 nd fault in B-Phase and fault gets cleared. The less dip in voltage for 20 seconds after occurrence of 1 st faultindicates a high resistance fault.Figure 55: Voltage profile at Kanpur showing delayed clearance of faultPOSOCO Page 68 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.1.8 Case Study-13: Tripping of HVDC Rihand-Dadri Bipole on 12-Jan-2011Figure 56: Dip and rise in voltage profile at KanpurThe graph above shows voltage profile at 400kV Kanpur Bus during tripping of HVDC Rihand-Dadri Bipole. Some rise and dip in voltages were observed during tripping of HVDC pole-1 &pole-2.5.1.9 Summary of fault analysis using synchrophasors dataThe synchrophasor data has been extremely useful in forensic or post event analysis even inthe absence of disturbance recorder/Event logger prints in most cases.Since the commissioning of 1st phase of synchrophasors in May 2010, the synchrophasor datahas been utilized to analyze a total of 106 grid events. In several cases the vital informationfrom Disturbance Recorder/Event logger installed at the substation was not available. In mostcases the event analysis report was also not available. In all these cases the synchrophasorsdata proved to be extremely useful. Few of the grid events that occurred in 2012 wherein thesynchrophasor data was the mainstay for post fault analysis has been tabulated below:POSOCO Page 69 of 143
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Synchrophasor Initiative in India - erldc

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