Overvoltage protection method and device of current transformer
An overvoltage protection device and current transformer technology, applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device for limiting overcurrent/overvoltage, etc., can solve the influence of heat generation, stable operation of current transformer, The protection voltage level and time node cannot be set intelligently, so as to achieve the effect of protection, personnel safety, and stable and reliable work.
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[0016] see figure 1 , the present invention provides a current transformer overvoltage protection method, the current signal on the secondary side of the current transformer is collected by the sampling unit 7, and the current signal is converted into a voltage signal, and the single-chip microcomputer 10 compares the collected voltage signal with the preset Compared with the predetermined protection value, it is judged whether the secondary side of the current transformer is an open circuit; when the converted voltage signal is greater than the preset protection value, the single-chip microcomputer 10 sends a protection control signal to the magnetic latching relay 1, The magnetic latching relay 1 short-circuits the secondary circuit of the current transformer; when the converted voltage signal is not greater than the preset protection value, the normal connection state of the current transformer is restored.
[0017] When judging whether the secondary side of the current tra...
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