Q.

Earth fault protection for an electric motor is provided by

  • AInstantaneous overcurrent relay.
  • BInstantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs.
  • CGround wire
  • DBoth (b) and (c) 
Correct Answer : (D)

Both (b) and (c) 

Hints :

Earth fault protection for an electric motor is provided by Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs and Ground wire.

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