Article,

Esperience from Insulators with RTV Silicone Rubber Sheds and Shed Coatings

, and .
(1989)

Abstract

long-rod c:anp::>site insulators, with weather sheds rrade of room temperature vulcanizing silicon rubber CXXTCX)UOds (RIV), ..ere exposed for m3.rly years to HVAC and HVIX: under realistic O'.)nditions and natural p::>llution. It 1110s found that tfle shed material, quite in contrary to the experience gained fran insulators with~sheds of other organic rraterials e g EP!l'1 rubber, undergoes a slo..1 degradation which improves the already superior water repelling properties of the silicon rubber CXXTCX)unds. The improvenEnt seems to be due to a low molecular layer which is produced on the surface of the insulator sheds. This layer improves the hydrophobicity of the surface, while protecting the surface fran further de- Aaation. Weather sheds of p::>rcelain housings O'.)ated Wh a thin layer of R'.lV give similar results to those obtained with long-rod silicon rubber insulators. The RIV O'.)ating, although it led to increased salt dep::>sit density, reduces the leak currents and the withstand of the insulator under the sane p::>llution conditions.

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