Resumo

CORREA, Lorena E et al. Performance evaluation of ceramic insulators coated with titanium dioxide films to reduce soiling. Rev.fac.ing.univ. Antioquia [online]. 2013, n.66, pp.131-140. ISSN 0120-6230.

The soiling of in-service electrical insulators exposed to the atmosphere is a major problem in power transmission lines. Several inorganic and organic particulate materials are deposited on insulator surfaces forming a layer that could become conductive in the presence of moisture. This produces different phenomena that could deteriorate the insulating properties of the material and eventually lead to its rupture, affecting the electrical energy supply. Currently, a method based in the application of a titanium dioxide film is being developed. This method tries to minimize the pollution accumulation on the porcelain insulators without affecting their electrical properties. In this work the performance of two different thicknesses of the coating film on the porcelain insulators was evaluated by means of contact angle, adhesion, leakage current, dry-flashover voltage and erosion laboratory tests. Finally, the in-service behavior of coated and no-coated insulators installed in a power transmission tower was evaluated. The coated insulators showed a good performance in the laboratory tests. Moreover, before 5 months of exposure in the energized power line, a decrease in the soiling was observed.

Palavras-chave : Atmospheric soiling; titanium dioxide; ceramic insulators.

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