The treatment of differential ground fault based on the external signal
In order to solve the ground fault in ungrounded systems,this paper applies the differential protection method based on the"external signal generating device and feeder terminal unit"to the external signal ground fault selection technology,proposes differential protection method of ground fault detection criteria and action principles,and achieves segment selection on the basis of ground fault phase selection.Finally,the effectiveness of the method is verified through a case study,and the results show that the proposed fault discrimination method has high accuracy and can minimize the range of ground fault power outages,which can also improve fault handling efficiency and power supply reliability.
万方数据
维普
