Abstract

Hydrophobicity of the fresh surface of composite insulators is very high. Thus, it is very difficult to form a uniform wet contaminant layer on it in an artificial contamination test. Such a high hydrophobicity will be more or less lost, even if it recovers in case of some kinds of rubbers, with time during service. Accordingly, artificial contamination test simulating on an aged composite insulator is thus essential in the evaluation of such type of insulators. In this paper, a realistic method simulating such a condition is proposed based on the recent experimental results.

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