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| Figure: Protective Relaying System |
Functions of Protective Relays:
- To detect the faults. For Example: Short circuits.
- To detect abnormal operating conditions. For example:
Over loads, 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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