Failure of the electrical secondary circuit often destroys or affects the normal operation of power production. For example, if there is an error in the secondary circuit connection of a differential protection of a substation, when the load of the transformer belt is large or a cross-phase phase-to-phase short circuit occurs, a false trip occurs; if the line protection wiring has an error, once the system occurs If the fault occurs, the trip of the circuit breaker may not trip. If the trip is not tripped, it will cause a serious accident of equipment damage and power system collapse. If there is a problem with the measurement loop, it will affect the measurement, and the revenue will be reduced or It is difficult to determine whether the power quality is acceptable or not. Therefore, although the secondary circuit is not the main body, it plays an extremely important role in ensuring the safety of power production and providing qualified electric energy to users.
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