Pollution Measurements to Assess the Performance of Naturally Exposed Silicone Rubber Composite Insulators

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At present line and apparatus composite insulators are widely accepted for use on AC overhead lines and in high voltage substations. The present paper concentrates on measurements of different pollution parameters of naturally exposed apparatus composite insulators tested at five different sites covering coastal, tropical and semi-desert environments. In general all tested silicone rubber apparatus insulators (for the period from 1 to 8 years) performed well. However, the difference in pollution layer is evident even for the sites formally belonging to the same class, e.g. coastal sites. The standard parameters, ESDD/NSDD are not enough to understand and proper evaluate the pollution performance of composite insulators. It is suggested to use the Wettability Class (WC) and Hydrophobicity Transfer (HT) tests in addition to the standard parameters.

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