A protective relay is required to register power loss, voltage dips, or overvoltages in order to avoid major accidents, flashovers, and other incidents. If there is an abnormality in the current voltage or other electric power measurements, also known as a fault, a protective relay will detect it. In this case, it can trigger an alarm, as well as a circuit breaker that is used to switch the electric power on and off to minimize system damage. To mitigate the risk of damage due to protection system failure, relays are often used in parallel systems.
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