Partial Discharge Propagation Characteristics in Cable Branch Box of 10 kV Power Distribution Network

The characteristics of the partial discharge signal in the cable are an important basis for evaluating the insulation level of the cable. And the detection of the cable partial discharge signal is conducive to more convenient and faster accurate grasp of the operating state of the cable insulation, which is conducive to the reliable operation of the cable. In this paper, for the YJLV22-10 kV cable branch box, the propagation characteristics of the partial discharge signal in the cable branch box under different wiring methods are experimentally studied. It shows that when the cable outlet is equidistant, the local discharge signal in the branch box cable increases with the number of joints, the attenuation of the signal amplitude increases, and the front and pulse width of the waveform become wider. When the cable outlet is not equally spaced, the propagation characteristics of the local discharge signal are related to the number of taps and the length of the cable. The conclusions obtained in this paper have reference value for the identification and positioning of partial discharge signals of cables.