Surface Discharge Phenomena On Synthetic Ester-Pressboard Interface: Effect Of Moisture

The tangential component of electric field along the interface of oil and pressboard causes surface discharge (SD) or surface tracking (different stages of SD is shown in Fig. 1) which can damage the whole or part of insulation structure. Partial Discharge (PD) activity at the interface begins before full surface discharge [1]. In this work, an experimental study was conducted to characterize surface partial discharge pheno mena at synthetic-ester and pressboard interface with moistur e impurities.