Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests

摘要

The fundamental properties of room temperature vulcanizing silicone rubber (RTV) coatings, which have been applied to improve contamination performances of ceramic insulators, are investigated. Leakage current on plastic substrates and actual ceramic insulators coated with RTV in salt-fog and rotating wheel dip tests are evaluated. Roles of alumina trihydrate (ATH) filler level, filler particle size, filler surface treatment and type of coating substrates on electrical performances and lifetimes of RTV-coated insulators are investigated.