Article,

Laboratory Analysis of Naturally Aged Silicone Rubber Polymer Insulators from Contaminated Environments, 138 to 765 kV

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PRELIMINARY, (-)

Abstract

Silicone rubber housed non-ceramic insuUdors were studied after field aging in various service enviromnents for periods offram 7 years to more Iluut 10 years. The coniJitfun of the aged silicone rubber was compared to that of new material, ,:usin.g on the characteristics of hydrophobicity recovery and contaminant encapsulation by low molectdarweight polymer. The jie1ii aged materials are shown (0 exhibit hydrophobicity characteristics comparable to those of new,unaged silicone rubber.

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