Finite Element Model Simulation of Cavity Partial Discharge in Solid Dielectric

Partial discharge modeling and simulation can help to deeply understand the physical process behind partial discharge and the damage law to insulation performance, to determine the characteristic parameters affecting the partial discharge behavior, and to mine the correlation information between the partial discharge information and the insulation state of the equipment. This is of great significance for improving the theoretical basis of the partial discharge on-line monitoring system of power equipment to maintain the safe operation of the power system and prevent equipment failure. This paper establishes a new finite element model by the finite element analysis method to describe the partial discharge phenomenon of spherical cavities in a homogeneous solid medium. Based on this model, the influence of various applied stresses on partial discharge activity is studied. The simulation results collect and analyze the phase, number of discharges, and amplitude of discharge activity, and the changes in average discharge, total discharge per cycle, average discharge per cycle, maximum discharge amplitude, and minimum discharge amplitude with time and voltage phase are counted. Finally, according to the analysis of simulation results, the characteristic parameters with significant influence on partial discharge activity are identified.