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Saturday, September 25, 2010

Power Transformer Electrical and Mechanical protection (Part 2)

This will be the second part of the table about Power Transformer Electrical and Mechanical Protection.
While I tried my best to ensure the correctness and completeness of the entries, it would be nice if someone could also share and give update on the procedures which is applied on their field of work.


INDICATORSNATURE OF TROUBLEEFFECTSREMEDIAL MEASURESNOTES
Power Transformer Bucholtz AlarmAccumulation of gas generated inside tankInsulation deteriorationEject Gas    -
Power Transformer Bucholtz TripSevere gas generated due to decomposition of Transformer internal partsPower Transformer Shutdown/isolation;
actuates lockout relay
Determine source of gas generated, test entire Transformer for internal faults     Never energize the equipment unless satisfactory test results for operation is obtained
Power Transformer Pressure relief device operatedExcessive accumulation of internal pressure due to gas generated inside the tankPower Transformer Shutdown/isolation;
actuates lockout relay
Determine source of gas generated, test entire Transformer for internal faultsReset Pressure relief device
Power Transformer surge relay tripImpulsive oil rise/dropPower Transformer Shutdown/isolation; actuates lockout relayDetermine source of gas generated, test entrie on-load tap changer tankCheck for severe internal fault due to oil leaks
Power Transformer Oil Level AlarmMain Tank Oil leaks or over filling of insulating oilCritical Transformer Oil Level AlarmCheck gaskets, valves, oil pipes, conservator gauge, radiator, add or reduce oilAlarm may be due to lower maximum oil level inside tank
Power Transformer On Load Tap Changer level alarmOn Load Tap Changer Tank leaks or over filling of insulating oilCritical Diverter Oil Level AlarmCheck gaskets, valves, oil pipes, conservator gauge, radiator, add or reduce oilAlarm may be due to lower maximum oil level inside tank

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