Abstract
The electrical performance of room-temperature vulcanizing (RTV) silicone rubber insulator coatings under accelerated aging in a salt-fog chamber is reported. The RTV coatings were evaluated in fog produced from saline water at 900 mu S/cm conductivity. The effect of the contaminants deposited during dry band arcing was evaluated with respect to the performance of RTV coatings. The increase of the leakage current and the corresponding decrease of the contact angle on the surface of the coating are shown to be related to contaminants on the RTV-coated surfaces. Five cleaning methods to remove the contaminants from the coated surface are examined, using leakage current and contact angle measurement as indicators of their comparative effectiveness. >
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