Effect of Environmental Pollution on the performance of Power Transmission lines: Insulator’s Flashover

Damage to the Modern high voltage transmission limes due to Environmental Pollution is well recognized drawback in power system engineering. The damage can take several forms , most important of all is the degradation of the Insulators .This paper describes the various pollution types that are responsible for pollution flashover and how different types of Insulating materials were used to overcome the difficulty related to the environmental pollution with remedial measures to be taken while working with insulators under contaminated environment , because the high voltage insulators are the important part of the high voltage transmission lines in a country which is going to develop UHV power transmission lines.