Abstract：This paper aims to discuss the feasibility of spray grading method for assessing hydrophobic degree of polluted composite insulators in artificial pollution tests. In the course of study hydrophobicity state of polluted high temperature vulcanizing(HTV)silicone rubber, trying to find the link of droplet contact angles and hydrophobicity classes(HC) of polluted surface. By using contact angle method and spray grading method, following phenomena were observed in tests. Firstly, spray grading process changes the original state of dirty layer, surface hydrophobicity alters with test times of spray grading. Secondly, in the situation of surface hydrophobicity is unobvious, existing uneven distribution of hydrophobicity along the depth of dirty layer. Thirdly, in the collision of droplets with polluted surface, velocity of droplets affects classification results of spray grading. Test results suggest that spray grading does not suitable for hydrophobicity assessing in artificial pollution tests. In the transition process of surface hydrophobicity from hydrophilic to hydrophobic, the linkage of droplet contact angle and HC of polluted surface is not very clear. Traditional methods for hydrophobicity description are not applicable for polluted surface with unobvious hydrophobicity. It is necessary to search new methods or parameters to evaluate hydrophobic degree of unobvious hydrophobic surfaces.
戴罕奇,梅红伟,王黎明,赵晨龙,贾志东. 复合绝缘子弱憎水性状态描述方法Ⅱ——喷水分级法的不确定性[J]. 电工技术学报, 2015, 30(3): 240-249.
Dai Hanqi,Mei Hongwei,Wang Liming,Zhao Chenlong,Jia Zhidong. Description Method Ⅱ for Unobvious Hydrophobic State of Composite Insulators—Uncertainty of Hydrophobic Degree by Spray Grading Method. Transactions of China Electrotechnical Society, 2015, 30(3): 240-249.
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