The relay protection device refers to an automatic device that can react to equipment failure or abnormal operation in the power system, and acts on the circuit breaker to trip or send a signal. Its functions include: (1) The power system does not operate during normal operation. (2) When the power system is not operating normally, an alarm signal is issued, and the on-duty personnel are notified to handle the power system to resume normal operation as soon as possible; (3) When the power system fails, the faulty power equipment is identified, and the fault point and the power point are turned to Between the circuit breaker closest to the fault point, a trip command is issued to isolate the faulty part from the rest of the grid.
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