Partial discharge measurement of 4 types of electrodes configuration in air insulation using high frequency current transformer sensor

Abstract

This paper deals with the occurrence of Partial Discharges on electrical equipment due to the high electric field exceeding the electric strength of Air. We can model PD occur in electrical equipment by using 4 types of electrode arrangement. There are Needle-Plane, Needle-Sphere, Needle-Needle, and Needle-Sphere. In this experiment, 4 types of electrodes with 10 mm gap between the two electrodes were used to produce a high electric field. PD measurement was conducted using phase-resolved measurement system which able to measure the PD magnitude, phase of PD occurrence as well as PD number. The task was done using a digital oscilloscope combined with a personal computer. The analysis of the PD data was conducted by utilizing phase-resolve PD pattern patterns. The experimental results showed that PD took place at around the peak of the applied voltage. Phase-resolved analysis indicated that partial discharge magnitude as well as partial discharge occurrence were strongly dependent on the instantaneous applied voltage. The simulation was able to generate phase-resolve PD pattern patterns similar to those obtained from the experiment.