Particles Behavior in Electrical Insulation Cavities in PD Condition Using Practical Measurements and FEM Analysis

Abstract

In this research, partial discharge phenomena in the air cavities inside an electrical insulation using electrical and plasma physics at the same time are modelled, simulated and in a laboratory condition confirmed. Three different position of cavities, one adjacent to the high voltage electrode, the second adjacent to the ground potential and the third between two electrodes inside the insulation are considered. The electron and ion densities inside the cavity affected by electrical field and ionization phenomena as leakage current are considered. To evaluate the validity of calculated leakage current a practical model was prepared and in laboratory tested. Compering the measured and the calculated leakage currents confirms the simulation results. The simulation results show that the most electrical discharges occurred inside the cavity are as local ionization in one side of the cavity and the discharges occur between two sides of the cavity when the polarity of the ac applied voltage changes. All simulations of this research have been done using COMSOL finite element software.