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Flashover Characteristic of Polluted Silicone Rubber with Different Hydrophobicity
Pages: 102-111
Year: Issue:  10
Journal: Transactions of China Electrotechnical Society

Keyword:  Silicone rubber insulatorhydrophobicitypollution flashoverdroplet areaelectric arc;
Abstract: This paper introduces the flashover characteristics of polluted silicone rubber plate samples with different hydrophobic properties. By virtue of quantitative brushing method, samples were polluted by controlling hydophobicity transfer time to obtain different hydrophobic properties. The maximum value of droplet area on the pollution layer stood for the state of surface hydrophobicity. The impacts of hydrophobicity on flashover voltage, pollution resistance and the development of arc were studied. Test results show that flashover voltages of samples increase with the improvement of surface hydrophobicity. A correlation exists between flashover voltage and the maximum value of droplet area. However, deviation increases from hydrophilic state to hydrophobic state. The morphology of droplets has a great effect on arc development. When drops form continuous water film, the number of arc paths is limited and the value of flashover voltage is low. However, when the drops on the surface are spherical and scattered, discharge areas are scattered s and the flashover voltages are high. According to the results of flashover tests and the different patterns of droplets, hydrophilic surface HC7, is subdivided into HC7 A, HC7 B, HC7 C and HC7 D respectively. Despite very unobvious hydrophobicity of HC7 B, flashover voltages of samples with HC7 B are obviously higher than those with totally hydrophilic states, such as HC7 C and HC7 D. Therefore, if the configuration structure is designed according to the flashover voltage related to the HC7 B state, structure height of composite insulators can be shortened with the ensured safety.
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