Q.

The domains of power system where directional overcurrent relay is indispensable are

  • AIn case of parallel protection 
  • BIn case of ring main feeder protection
  • CBoth (a) and (b) 
  • DNone of the above 
Correct Answer : (C)

Both (a) and (b) 

Hints :

The domains of power system where directional overcurrent relay is indispensable are In case of parallel protection  and In case of ring main feeder protection.

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