February 22, 2017

What are the functions of Protective Relays?

Figure: Protective Relaying System

Functions of Protective Relays:

  • To detect the faults. For Example: Short circuits.
  • To detect abnormal operating conditions. For example: Overloads, unbalances, low voltage or frequency.
  • To Initiate the operation of the circuit breaker to isolate the defective element from the rest of the system, thereby protecting the system from damages consequent to the fault.
  • To Control and supervision. For example: Automatic reclosing, bus transfer, synch-check.


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