Transcription of Benefits of SFRA - Case Studies
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Benefits of SFRA - Case Studies
Benefits of SFRA - case Studies16thInternational Conference on Large Power transformers -Modern TrendsB B AhirGujarat Energy Transmission Corporation LimitedOutline ConditionMonitoringinGETCO WhySFRA? Casestudy(1):SFRA-Howithelpedtofindafaul tinwinding Casestudy(2):SFRA-Howithelpedtofindafaul tincore Casestudy(3):SFRA-Howithelpedtofindafaul tincore Conclusion2 Condition Monitoring in GETCO3 Technology/ ToolOnlineOfflineInsulation Resistanceand PolarisationIndex RoutineLow Voltage tests Capacitance & Tan measurements (Bushing) Infrared Thermograph Measurement of Moisture in Oil DGA SFRA Acoustic Partial Discharge Measurement moisture content in active parts of Transformer TransformerWhy SFRA ?4 To assess mechanical integrity of a transformer To detect core displacement and winding deformation due to : Large electromagnetic forces from fault current Transformer transportation and relocation Winding shrinkage causing release of clamping structure To detect broken or loosened clamping structure Hoop Buckling Shorted turns and open windingCase study (1):5 Location : 220 kV Kapadwanj S/sRating : 220/66kV, 100 MVADate : SFRA along with Low Voltage Test and DGA OSR relay operated due to LV side Isolator support insulator flash overCase study (1):LV MAGNETIC BALANCE ( Post fault Abnormal )APPLIED VOLTAGETap 1 Tap 17
Benefits of SFRA - Case Studies 1 6th International Conference on Large Power Transformers- Modern Trends B B Ahir Gujarat Energy Transmission Corporation Limited
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