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    What is a protection relay?     Protection relay is an electrical device used to sense an abnormal condition in a power system and operate a circuit breaker or an alarm signal. Related searches: What is a protection relay?    Protection relay   What is the purpose of protection relay? Why is protective … Read more

How rating of a circuit breaker for a system is determined?   The rating of a circuit breaker for a system is determined based on the balanced three phase fault occurring in it. Even though the three phase faults are quite rare, it imposes the most severe duty on the circuit breaker. Hence for any … Read more