Study on Pollution Severity of Porcelain Insulators Using LC and Phase Angle Measurement

This paper deals with the analysis of pollution severity of power transmission line porcelain insulators under wet conditions using leakage current (LC) and phase angle measurement. In this work, laboratory based experiments were carried out on single disc porcelain insulator under AC voltages at different pollution conditions with sodium chloride as a contaminant. Leakage current and voltage waveform during the experimental studies were measured. Phase angle relationship between the leakage current and voltage were calculated. Variation in leakage current and phase angle relationship at different pollution levels is used to identify the various stages involved in the failure due to flashover. The reported results of this preliminary study on single disc porcelain insulator enable more accurate diagnosis of flashover of insulator due to pollution.