Abstract:
This work presents the effect of room temperature vulcanized (RTV) silicone rubber coating on cap and pin type porcelain insulator under ac (50Hz) flashover voltage (KV). Describes experimental results obtained for improvement of porcelain insulator removed from 33kV overhead transmission line at Aswan, Egypt after 28 years of service. Also, this study briefly surveys the environmental contaminated surface of porcelain insulator. The flashover voltage have been measured for insulator under various contaminated materials such as ; (cement – sand – silica fume – phosphate ). This work concluded that RTV silicon rubber coating register good electrical performance under dry, wet and wet with 5% , 10% NaCl conditions.

Keywords: Flashover voltage, Porcelain insulators, Silicone rubber, Coating, Environmental Contaminated