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Why percentage differential relay is not suitable for detecting the earth fault near neutral of an wye connected winding?
Foyezsharif
when earth fault occurs very near to the neutral point of wye winding, the voltage available for driving earth fault current is small. Hence fault current is low. Relay has to be too sensitive and then it can operate for spurious signals like external faults, switching surges etc.
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∙ 10y ago
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