PERFORMANCE OF A STING OF SUSPENSION INSULATOR AT 400 kV LINE DUE TO EFFECT OF POLLUTION

Insulator is one of the important component of power transmission line. For giving support and providing insulation for over head line conductor against the highest voltage and worst condition insulator are used.Suspension insulator is generally used in transmission line because of less expensive price as well as capability to work at different voltage lavels.The main problem of this type of insulator I non –uniform voltage distribution on its units .Due to the presence of pollution on the insulator surface considerably modifies the voltage distribution &string efficiency. This paper discribes the sting efficiency of suspension insulator due to the effect of pollution. Keywords: 400 kv line, Pollutions etc