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The PRTV coating materials had perfect performance in antipollution flashover for porcelain and glass insulators because of the surface hydrophobicity. Usually, the whole strings of insulators were coated with PRTV coatings in engineering application. In order to reduce the consumption of materials, a way of incomplete spraying PRTV coatings was mentioned in this paper. And the pollution flashover...
This paper presents the results of a study on the contamination characteristics of porcelain, glass and composite insulators in natural high altitude areas (1970 m). The test used the solid layer method, in which a contaminant solution consisting of sodium chloride, kaolin powder and water was used to coat the insulator surfaces. The insulators were wetted by steam fog in fog chamber. The 50% withstand...
This paper describes the influence of sugar in contaminant to outdoor insulation characteristics of glass insulator. First of all, field tests were carried out to analyze the pollution layer condition of discharged glass insulators. Then the differences of surface resistance, leakage current and flashover voltage of glass insulators between the contaminants with and without sugar were investigated...
This paper investigated the leakage current characters of outdoor insulators in different relative humidity and provided an approach to evaluate the contamination levels by the numbers of leakage current pluses. Artificial pollution tests were carried out on a kind of widely used glass insulator. Leakage current waveforms in different contamination levels and different relative humidity (RH) were...
This paper presents the results of an investigation on the DC flashover characteristic of contaminated glass insulators at natural high altitudes (1970 m). The arcing behavior on natural contaminated glass insulator surfaces was studied using a high-speed camera. The experimental results show that the DC arcs have a significant influence on the flashover performance of contaminated glass insulator...
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