Answer / ranjith

It detects the faults of winding in neutral grounding side

Answer / k.prakashchandra

REF is restricted earth fault relay, for internal earth fault of Tr . SBEF is standby earth fault relay or backup for both internal and outside earth faults . The CTs of both are connected to neutral of Tr. Discriminative setting is required

Answer / suresh

Ref is restricted earth fault, The relay was acted  for winding to winding shorted with ground.

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