Study on Propagation Mode and Characteristics of Partial Discharge Signal in The Cable

When partial discharge occurs in gas insulated switchgear (GIS) and other power equipment, the discharge signal needs to be transmitted through the medium. At present, the main transmission medium of partial discharge signal in the monitoring system is cable, so it is necessary to study the cable transmission characteristics of partial discharge signal. Based on this, firstly, the propagation characteristics of partial discharge (PD) signal on cable are studied theoretically, and the effects of different parameters on cable propagation characteristics are analyzed; Then, the XLPE cable model is built, including conductor, insulating layer, metal shield and insulating sheath. On this basis, the simulation model of XLPE cable test system is built to simulate the propagation characteristics of partial discharge signal under different parameters, including the relationship between the propagation speed of signal on the cable and the attenuation characteristics; Finally, the propagation characteristics of PD signal proposed in this paper are verified by field experiments. This research can be applied to the positioning system of local discharge power supply, and has good engineering application value.