Answer / Priyanka Arora

Protection relays testing through current injection is done by applying a controlled current to simulate fault conditions. This process allows for the relay's response to various fault situations to be tested and verified.

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?

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