Feed line zero sequence current transformer CT polarity verification method and device

The invention discloses a feed line zero sequence current transformer CT polarity verification method and a device. The method comprises the following steps of under a system charged state, recordingthe information of each feed line arranged on a system bus, wherein the information includes the phase of a zero sequence current and the phase of a zero sequence voltage; and according to the information, selecting the feed line in which the phase of the zero sequence current lags the phase of the zero sequence voltage in a 90 degree +/-delta range; and determining that the zero sequence CT polarity of the selected feed line has a wiring error. In the correlation technology, the polarity verification accuracy of a feed line zero sequence current transformer CT is low under the charged state.In the invention, the above technical problem is solved. 本发明公开了种馈线零序电流互感器CT极性校验方法及装置。其中，该方法包括：在系统带电状态下，记录系统母线所带各馈线的信息，其中，信息包括零序电流的相位和零序电压的相位；根据信息，选出零序电流滞后零序电压的相位90°±Δ范围内的馈线；确定选出的馈线的零序CT极性存在接线错误。本发明解决了相关技术中在带电状态下对馈线零序电流互感器CT进行极