Model And Dynamic Simulation Of Partial Discharge In Single Void Of Sold Insulation

Partial discharge play an important role in the deterioration and ageing of high voltage electrical equipment insulation, and the insulation state of equipment will directly affect the security and stability of the operation of the electrical equipment in power system. Therefore, the research of partial discharge becomes an important subject in the field of high voltage engineering. Research of the mechanism of partial discharge is the basis for the detection and evaluation of partial discharge level. The PD in a void of solid insulation equipment is an important kind of PD behaviors. The numerical simulation of PD in voids can help to realize the physical process of PD in voids and the rule of insulation damage. It is an importance means to realize the mechanism of PD. The theoretical simulation can provide research basis for the monitoring of the partial discharge, which have a great significance for the security running of power system.This paper began with the mechanism of discharge in gas, and the moving rule of the charged particle in electric field was explained. The basic principle of plasma was explained, and the three-capacitance model was improved which based on the principle of plasma. The process of partial discharge of single and double voids in epoxy resin was simulated by Matlab/Simulink. The waveform of the simulation of the new model was similar with the measurement result. The new model is the complement of the traditional three-capacitor model. In order to make the simulation of PD more realistic, from the view point of plasma, a PD model was established by PIC (Particle In Cell), electric field was calculated by the two-dimensional Poisson equation of finite element, and the Monte-Carlo Collision Model was coupled with the Poisson field calculation. The nonlinear process of movement and collision of many particles was solved, and the two-dimensional dynamic process of PD was presented. Electrons that accumulated on the surface of voids can be observed clearly by the simulation of this paper. The accumulated charges distort the electric field in voids and produced streamer discharge.