What are the protections used in a HT breaker to protect
the HT motors.
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Answer Posted / shantanu dash
To protect the HT Motor, Motor protection Relay with the
following protection features are used in HT Breaker. they
are :-
1.Short Circuit
2.Excessive Start time
3.Thermal Overload
4.Locked Rotor during running/start up
5.Unbalance/loss of Phase/single phasing
6.Earth fault
7.Loss of Load
8.Temperature supervision of motor
9.Limitation of No. of Starts/Time between starts
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