Frequency characteristics of PD waveforms on polluted composite insulator surfaces

Abstract

Investigations of partial discharge characteristics of the surface leakage on polluted composite polymer insulators (SiR and EPDM) have been performed. This work is part of a program aimed at examining the potential for PD characteristics analysis to provide information about the condition of composite polymer insulators. The investigation reported examined the PD waveform characteristics at high frequencies. The use of high frequency measurements for on-line applications reduces electrical interference. This work was performed utilizing high frequency CTs to monitor PDs. It was found that there were significant variations in the PD waveform frequency spectrum, depending both on the PD magnitude and more importantly on the duration of the PD activity.