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Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on
External earth fault REF relay trips along with earth fault
relay.The REF relay has no complant as we tested relay.Why is
it happening?

Answer Posted / k.prakashchandra

The NCT is responsible..The ungrounded lead from The NCT may
be grounded.

Is This Answer Correct ?    1 Yes 0 No



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