Device and method for checking polarity of zero-sequence current transformer

The invention discloses a device and method for checking the wiring polarity of a zero-sequence current transformer. The device comprises: a bus three-phase voltage transformer, a zero-sequence voltage transformer used for obtaining zero-sequence voltage of the bus, a zero-sequence current transformer used for obtaining zero-sequence current of each outgoing line, and a measurement amplification module, a data acquisition module and a data processing module connected in sequence, and the input end of the measurement amplification module is connected with the output ends of the bus three-phasevoltage transformer, the zero-sequence voltage transformer and the zero-sequence current transformer. Whether a grounding fault occurs or not is judged based on the amplitude and variation of the output signal of the zero-sequence voltage transformer; whether the wiring polarity of the zero-sequence current transformer is correct or not is recognized based on the phase difference of the phase of the output signal of the z