不同憎水性绝缘子串覆冰电场仿真分析

已有研究表明,通过涂覆憎水性材料可减少绝缘子覆冰量,并提高其覆冰闪络电压。目前使用较为广泛的为RTV涂料,但近年来,国内外一些研究人员研制出了仿荷叶超疏水涂料,其静态接触角超过160°,将其涂覆于绝缘子表面,取得了良好的防覆冰效果。根据普通玻璃绝缘子、涂覆RTV涂料绝缘子以及涂覆有超疏水涂料绝缘子的实际覆冰形态,建立了覆冰绝缘子串电场仿真模型,并进行了仿真分析。结果表明,在相同外施电压下,超疏水绝缘子串模型的最大表面电场与电场不均匀系数均低于RTV绝缘子串模型以及无涂层玻璃绝缘子串模型。研究成果对于防止绝缘子串覆冰闪络事故具有积极的指导意义。

Simulation and Analysis of Electric Filed for Ice-covered Insulator Strings with Different Hydrophobic Nature

There are some studies shown that the ice - covered quantity of insulator can be reduced and ice - covered flashover voltage can be improved by coating the hydrophobic materials. At present, the RTV coating materials are more widely used. In recent years, however, the domestic and foreign researchers have developed the lotus leaf imitated super - hydrophobic coatings, whose static contact angle exceeds 160°, and a good anti - icing effect is obtained by coating it on the surface of the insulator. According to the actual ice - covered state of the common glass insulator, the RTV - coated insulator and the insulator coated with super - hydrophobic coatings, the simulation model for the electric field of the iced insulator string is established and the simulation analysis is carried out. The result shows that, under the same applied vohage, both the maximum surface electric field and the electric field uniformity coefficient of the hydrophobic insulator strings model is less than that of the RTV insulator string model as well as the uncoated glass insulator string model. The research has a positive significance to prevent the icing flashover accident of insulator strings.