The use of room temperature vulcanized (RTV) silicone rubber (SIR) coatings for improving the contamination performance of existing ceramic or vitreous insulation has become popular. Silicone rubber coatings attributes include good dielectric properties and flexibility over a wide temperature range, combined with excellent resistance to ultraviolet radiation, chemicals, thermal degradation and corona discharge. However, the most important property of silicone rubber for outdoor insulation application is its hydrophobicity and the migration of the hydrophobicity, which is an ability to restore the hydrophobicity of the surface after a layer of contaminant has built up on its surface. In this paper, the factors which have effect on the migration of SIR RTV coating were studied including ingredients in SIR RTV coating and outside condition. The hydrophobicity migration of SIR RTV coating in the conditions of different kind of contamination, such as kaolin and kieselguhr, were compared discussed. It is shown that the hydrophobicity migration of SIR RTV coating is not only dependent on ingredients but also on factors of circumstance.
展开▼
