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Definition of "Protective Relay" |
In the AC power field, a relay used to either protect equipment from a system short, overload or some other abnormal system condition, or used to limit or mitigate the damage or outage caused by the system malfunction. / a device that monitors the condition of the electric power system and determines the presence of faults or other system anomalies. The protective relay monitors current flow, voltage level, or other parameter. When it operates due to a fault or other event, it initiates a trip signal intended to open the appropriate circuit breaker(s) or other protective devices. |
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