Analysis of transient EMI of air-insulated substation disconnect operation based Wigner-Ville distribution

The operations experiments of disconnect have been given in 220 kV air insulated substation, the conductive signals of electromagnetic interference have been obtained from potential transformer (PT) and capacitance voltage transformer (CVT) and primary analysis has been given. In order to find out the relationship of time-frequency domain and signal energy, Wigner-Ville distribution (WVD) is used to further analysis. The result reveals that the main frequency of the interference signal is mainly connected with parameters of the equipments in the substation and the configuration of the substation, other than disconnect operation time and speed. It is possible to filter the energy of high-frequency caused by disconnect or breaker operation.