Influence of Artificial Pollutants on Disc Insulators under Dry and Wet Conditions on Leakage Current and Flashover Voltage

Insulators are many used in air transmission and distribution systems and also substation. Because it's in the air, and its performance is influenced by age and the level of pollutants attached to it. Types of pollutant content attached to the insulator have effect on leakage current and flashover voltage on the insulator performance. Insulators polluted result in reduced surface resistance of insulator. This paper investigated influence of artificial pollutants in various types on porcelain and glass of disc insulators in dry and wet conditions which are the pollutants are KNO3, ZnSo4, S (Sulfur), CaCO3 and KCl. The insulators were tested in different pollution level designated as equivalent salt deposit density (ESDD). Based on insulators test result of various pollutant attached on insulator result in insulator performance are different. Pollutant types of KCl, KNO3 and ZnSO4 result in leakage currents flow on insulator surface are large. Insulators polluted by ZnSO4 and KCl cause flashover voltage on insulators decrease significantly.