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Question

The relay best suited for phase fault relaying medium transmission lines is 

A.

MHO relay 

B.

Reactance relay 

C.

Impedance relay 

D.

Resistance relay

Answer ( Option C)

Impedance relay 

Solution

Relay and their applications :

•Reactance relays- Short transmission lines

•Impedance relay's - Medium transmission lines

•Mho relays - Long transmission lines

Impedance relays are used for protecting medium transmission line in which arcing ground faults are infrequent.

Hence, the correct option is (C).

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