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Question

Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction?

A.

Directional over-current relay 

B.

Mho relay 

C.

carrier-current protective relay 

D.

Impedance relay

Answer ( Option B)

Mho relay 

Solution

Which is the main relay for protecting up to W0% transmission line-length in the forward direction Mho relay.

Mho relay used in long transmission line.

Mho relay is inherently a directional relay as it detects the fault only in the particular direction.

Hence, the correct option is (B).

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