Investigation of Flashover Performance on 22kV RTV Coated Bushing Under Non-Uniform Coastal Pollution

Abstract

Contamination concerned flashover method may pretense a rigorous hazard to trustworthy and unfailing process of bushings, while subjected to different ecological circumstances. Bushing plays a vital role in electrical transmission line. It is an insulator in which it is mainly connected to the windings of the transformer and provides insulation between the overhead transmission lines and transformer windings. Bushing is prepared by means of porcelain material and they serve as mechanical support for the transmission lines and exterior connections. They become polluted when they are positioned near unlike atmospheric condition like coastal, desert etc. The contamination may destroy the high voltage bushings and changes their electrical uniqueness being one of the major causes for mal functioning of high voltage bushings. Deposited pollution on bushing surface combined with humidity provides a conductive layer and leading to flashover mechanism. Inequality in quantity of contamination on the upper and lower surface in high voltage bushings may have enormous consequence on exterior flashover voltage and leakage current. In this manuscript high voltage bushing's pollution performance with non-uniformity was carried out. According to IEC60507 solid layer pollution method was taken to test the bushings in high voltage laboratory and the presence of un-uniform contamination distribution on bushings and their flashover performance was analyzed.