Study on Contamination Deposition Characteristics of Transmission Line Insulators

Pollution flashover accident of insulators may threaten the safety and stability of power system; however, there lacks an effective way to evaluate this potential risk, because the rule of contaminant deposition is still not fairly known. Artificial contamination tests are carried out to study the contamination deposition characteristics which may give help to evaluate the flashover probability. The results show that the amount of the contaminants on each section of the insulator has clear connections to the wind speed and direction. The amount and the distribution of the contaminants on the insulator surface are highly correlated to the flashover voltage. With the decrease of wind velocity, Equivalent salt deposit density values of transmission line insulators show the increasing tendency.