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Reply To: Protection riddle no.8 – Risk of operation in power plant

#1205
smuthukrshna

    Sensitve earth fault relays are always followed with time delay function.At the time of closing the breaker instantaneous relays will have a tendency to operate either due to line capacitance charging or due to unbalance magentic inrush current.If the time delay is kept to avoid maltripping that is sufficient. Regards S.Muthukrshna