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Answer Posted / mahammad rafi
The tripping contacts of protection relay may not be
adequate to carry the current of tripping coil. Hence, a
seperate tripping relay is used to give tripping command to
the trip coil, called Master Trip Relay. The operating
element of the Master Trip Relay is energised through the
respective protection relay. Further, in the event of
provision of more than one number of protection relays, a
seperate relay called Master Trip Relay is provided to
receive the trip command which in turn trips the switch
gear.
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