Can differential protection operate while its only one side is energized or being energized (HT side in this case)? When trying to energize a 132/11KV t/f from HT side when its differential protection operated while its LT side breaker was still open? Was it because of starting inrush current or t/f tap position?(It has an auto tap changer on HT side & while it was being energized tap position was...

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• Apr 2nd, 2010

Transformer tripped due to inrush not because of tap changerNumerical relays take care of harmonics during inrush current so transformer does not trips.If it is tripping setting needs to be checked

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