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Answer :

Directional relays are based on flow of power.

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Description : In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Answer : In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

Answer : Impedance relays are used for phase faults on long line.

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Answer : IDMT relays are used to protect the transformer against : External short circuits

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