Protective relay



It is a device that detects the fault and initiates the operation of the circuit breaker to isolate the defective element from rest of the system.

Methods of protection of feeder

 Non Unit Type Protection:

  1. Time-graded over-current protection
  2. Current-graded over current protection
  3.  Distance protection

Unit Type Protection:

  1.  Differential protection 
  2. Carrier-current protection

Uploaded Mon, 18-Jan-2021
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