Pollution Flashover for Composite Insulators Based on Characteristic Parameter Kh10
Dai Hanqi1, Sun Yue2, Wang Liming3
1. State Grid Beijing Electric Power Company Beijing 100031 China; 2. Beijing Union University Beijing 100101 China; 3. Department of Electrical Engineering Tsinghua University Beijing 100091 China
Abstract：This paper focuses on pollution flashover test for composite insulators based on the characteristic parameter Kh10. The leakage current and Kh10 of insulators were measured during wetting. The parameter Kh10 was used to characterize the wetting state of pollution layer. It is found that measuring Kh10 on artificial polluted insulators with large size should keep electric field on the measuring area as uniform as possible. The measurement voltage for Kh10 should not be too high, and the obvious change of polluted layer affected by strong discharge during wetting should be avoided. Method for the wetting test of composite insulators was improved. By measuring Kh10 on certain sheds, the surface state was used to represent the wetting state of the entire insulator. The correlation between wetting state of polluted layer and flashover voltage of insulators was studied. Test results show that characteristic parameter Kh10 can also effectively represent the wetting state of polluted layer for real insulators with large size. For the same type composite insulator, the flashover voltage is close if the Kh10 value is the same before flashover test. And this conclusion is not affected by the difference in pollution grade, pollution composition and hydrophobicity. This study not only improves artificial pollution test method of composite insulators, but also optimizes the condition monitoring method of natural polluted composite insulators.
戴罕奇, 孙月, 王黎明. 基于特征参量Kh10的复合绝缘子污闪试验[J]. 电工技术学报, 2020, 35(24): 5207-5217.
Dai Hanqi, Sun Yue, Wang Liming. Pollution Flashover for Composite Insulators Based on Characteristic Parameter Kh10. Transactions of China Electrotechnical Society, 2020, 35(24): 5207-5217.
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2020, Vol. 35 
