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| Influence of Water Band on AC Flashover Characteristics and Electric Field Distribution of Hydrophobic Surface |
| Liu Shili1, Li Weidong1, Li Zhenxin2, Pan Luyao1 |
1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China;
2. Jilin Power Supply Company State Grid Jilinsheng Electric power Supply Company Jilin 132012 China |
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Abstract When the hydrophobicity of the composite insulator is weakened, the surface of the composite insulator is easy to gather water droplets to form a water band in the wet environment, which affects the surface electric field distribution and surface flashover characteristics of the insulator. In this paper, a PTFE board is used to simulate the formation environment of the water band, and the influence of the shape of the linear and broken water band on the flashover process of the hydrophobic surface is experimentally studied. Based on the finite element numerical calculation, the electric field distribution of the water band and its surroundings is analyzed, and combined with the test results, the mechanism of influence of the water band on the arc development path is discussed. The results show that the smaller the opening angle θ of the water band is, the smaller the water band electric field becomes, and the larger the dry band electric field between the water bands will be. At the same time, the smaller the water band spacing d is, the larger the dry band electric field will be. When there is a broken-line water band on the water surface, the arc shows three different development paths according to the difference of θ and d.
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Received: 02 August 2021
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2022, Vol. 37 
