what is working of Master trip relay ?

Answer Posted / raviteja.n

In any substation master trip relay is employed bcz it
master relay and other relays act as slave relays. Any relay
may it be O.C ,REF, Earth fault relay,Buchloz relay etc.,
will sense the faulty nature of the circuit and they will a
signal to Master trip relay then master trip relay will give
tripping command to CB.

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