AC Pollution Flashover Characteristics of Polluted Insulators under Salt Fog Conditions
Guo Yujun1, Jiang Xingliang1, Meng Zhigao1, Li Yuanjun2, Gao Biao2
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400030 China; 2. State Grid Hangzhou Power Supply Company Hangzhou 310002 China
Abstract：The surface pollution of polluted insulators absorbs fog water and damps in the salt fog. Meanwhile, the salt in the salt fog deposits on insulators surface, which increases the surface conductivity and degrades the flashover performance of insulators. Insulators may flashover under lower voltage level even under operating voltage. This will threaten the safe and stable operation of the power grid. In this paper, experiments on three typical insulators, i.e. porcelain, glass and composite insulators, were conducted in different salt deposit densities (SDD) and fog water conductivities (γ20). The concept of additional salt deposit density (ASDD) was proposed to analyze the relationship among ASDD, SDD and fog water conductivity. The test results show that the ac flashover voltage decreases with the increases of both SDD and fog water conductivity, which has a negative exponential relationship with SDD while a linear relationship with fog water conductivity. The ASDD can be applied to analyze the combined effects of SDD and fog water conductivity. The relation between the fog flashover voltage and SDD and ASDD is a negative power exponent. The fog flashover can be treated as a special kind of pollution flashover.
郭裕钧, 蒋兴良, 孟志高, 李源军, 高标. 盐雾条件下染污绝缘子交流污闪特性[J]. 电工技术学报, 2017, 32(13): 248-254.
Guo Yujun, Jiang Xingliang, Meng Zhigao, Li Yuanjun, Gao Biao. AC Pollution Flashover Characteristics of Polluted Insulators under Salt Fog Conditions. Transactions of China Electrotechnical Society, 2017, 32(13): 248-254.
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2017, Vol. 32 
