Analysis of electric stress and partial discharge ultra high frequency signal

Abstract

Insulation plays a very crucial role in designing of electrical apparatus for transmission and distribution of electric power. Partial Discharge (PD) is the main reason for deterioration of insulation around the conductor which leads to complete breakdown of insulation interrupting the supply. Electric stress gives rise to partial discharge in the insulation system of electric apparatus. In this work two electrode configurations are considered viz. Point-Plane and Rod-Plane Electrode. The same has been modeled in the Finite Element Method (FEM) software. For stress analysis Partial Discharge Inception Voltage (PDIV) and Breakdown Voltage (BDV) is considered. PDIV and BDV are measured in the laboratory using Ultra High Frequency Sensors. Stress has been calculated for various gap distances between the two electrodes considering two configurations of electrodes for both PDIV and BD by modeling in FEM. Fast Fourier Transformation (FFT) is carried out for the Partial discharge signals captured in the Multiple Signal Oscilloscope (MSO).