Abstract：This paper aims to find out proper parameters to describe the unobvious hydrophobic state of polluted composite insulators, and to define the unobvious hydrophobic state clearly based on refinement of present hydrophobicity class(HC). Droplets horizontal projected area of 10μL indigo solution was used to reflect the hydrophobic state of dirty layer. Relationship of droplet area and flashover voltage was built for illustrating the influence of hydrophobicity on polluted flashover characteristics. Considering about the morphology of droplets and flashover values of samples, HC7 is divided into 4 stages, respectively are HC7A, HC7B, HC7C and HC7D. Comparing with test results of droplets area, contact angle and results of spray grading, HC7B is defined as unobvious hydrophobic state in this paper. Tests suggest that droplet area method is suitable for unobvious hydrophobic surface, on which contact angle method is unsuitable for describing hydrophobicity state. However, in the cases of polluted surface with strong hydrophobicity, droplet area method fails to specifically differentiate hydrophobicity state. Contact angle method is a good choice for strong hydrophobic surfaces
戴罕奇, 梅红伟, 王黎明, 王希林, 赵晨龙, 贾志东, 关志成. 复合绝缘子弱憎水性状态描述方法 Ⅲ——液滴面积法的适用性[J]. 电工技术学报, 2015, 30(8): 322-332.
Dai Hanqi, Mei Hongwei, Wang Liming, Wang Xilin, Zhao Chenlong, Jia Zhidong, Guan Zhicheng. Description Method Ⅲ—for Unobvious Hydrophobic State of Composite Insulators Usability of Droplet Area Method. Transactions of China Electrotechnical Society, 2015, 30(8): 322-332.
[1] 贺博, 万军, 金海云, 等. 复合绝缘子的老化特征分析[J]. 高压电器, 2009, 45(1): 21-24. He Bo, Wan Jun, Jin Haiyun, et al. Aging character analysis of composite insulators[J]. High Voltage Apparatus, 2009, 45(1): 21-24. [2] Liu H P, Cash G, Birtwhistle D, et al. Characterization of a severely degraded silicon elastomer HV insulator- an aid to development of lifetime assessment techniques [J]. IEEE Trans. Dielectr. Electr. Insul., 2005, 12(3): 478-486. [3] 杨成. 复杂环境下硅橡胶绝缘子老化与闪络现象研究[D]. 天津大学硕士学位论文, 天津, 2008. 5. [4] 梁曦东, 王成胜, 范炬. 合成绝缘子芯棒脆断性能及试验方法的研究[J]. 电网技术, 2003, 27(1): 34-37. Liang Xidong, Wang Chengsheng, Fan Ju. Research on brittle fracture of frp rods and the test method[J]. Power System Technology, 2003, 27(1): 34-37. [5] 郭浩. 我国复合绝缘子的应用及运行中的若干问题[J]. 电力设备, 2006, 7(4): 43-45. Guo Hao. Some problems in application and operation of composite insulator in China[J]. Electrical Equip- ment, 2006, 7(4): 43-45. [6] 刘洋, 刘贞瑶, 周志成, 等. 500kV进口合成绝缘子芯棒脆断原因分析及对策[J]. 江苏电机工程, 2011, 30(2): 25-27. Liu Yang, Liu Zhenyao, Zhou Zhicheng, et al. Analysis and countermeasures of core brittle fracture of imported composite insulator on 500 kV transmis- sion line[J]. Jiangsu Electrical Engineering, 2011, 30(2): 25-27. [7] 郭清滔, 廖福旺, 黄海鲲. 一起复合绝缘子芯棒脆断原因分析及对策[J]. 电瓷避雷器, 2010, 233: 19-21. Guo Qingtao, Liao Fuwang, Huang Haikun. Analysis on cause of core brittle fracture of composite insulators and its preventive measures[J]. Insulators and Surge Arresters, 2010, 233: 19-21. [8] 卢明, 马晓久, 阎东, 等. 复合绝缘子芯棒脆断原因分析[J]. 电瓷避雷器, 2007, 218: 1-4. Lu Ming, Ma Xiaojiu, Yan Dong, et al. Analysis on causes of brittle fracture of composite insulator cores[J]. Insulators and Surge Arresters, 2010, 233: 19-21. [9] 贾志东, 张威, 方苏, 等. 湿污环境中的复合绝缘子异物闪络[J]. 高电压技术, 2010, 36(8): 1893-1899. Jia Zhidong, Zhang Wei, Fang Su, et al. Foreign body caused flashover on composite insulator in wet and contaminated condition[J]. High Voltage Engineering, 2010, 36(8): 1893-1899. [10] 肖猛, 文曹, 司马文霞, 等. 硅橡胶表面的分离水珠放电与不明原因闪络[J]. 重庆大学学报(自然科学版), 2006, 29: 42-46. Xiao Meng, Wen Cao, Sima Wenxia, et al. Discharges between discrete water drops on the silicone rubber surface and reason unknown flashover[J]. Journal of Chongqing University(Natural Science Edition), 2006, 29: 42-46. [11] 龚坚刚, 包建强. 浙江合成绝缘子“不明原因”工频闪络的试验分析[J]. 高电压技术, 2001, 27(5): 70-71. Gong Jiangang, Bao Jianqiang. The test and analysis of power frequency flashover of composite insulator on transmission line[J]. High Voltage Engineering, 2001, 27(5): 70-71. [12] Liang X D, Wang S W, Fan J, et al. Development of composite insulators in China[J]. IEEE Transacions on Dielectric and Electrical Insulatin, 1999, 6(5): 586-594. [13] Rowland S M, Xiong Y, Robertson J, et al. Aging of silicone rubber compositer insulators on 400kV transmission lines[J]. IEEE Transacions on Dielectric and Electrical Insulatin, 2007, 14(1): 130-136. [14] 许喆. 复合绝缘子的长期运行性能试验研究[D]. 济南: 山东大学, 2009. 6. [15] 李震宇. 污秽地区硅橡胶复合绝缘子长期性能的研究[D]. 清华大学博士学位论文, 北京, 2006. 6. [16] 陆泓昶, 黎亮, 李李. 三峡荆州—益阳Ⅱ回500kV输电线路杆塔规划研究[J]. 电力建设, 2007, 28(12): 47-50. Lu Hongchang, Li Liang, Li Li. Research on tower planning of Jingzhou-Yiyang 500kV double circuit line[J]. Electric Power Construction, 2007, 28(12): 47-50. [17] 胡兆意. 500千伏输电线路造价简析[J]. 电力技术, 1984(3): 1-5. Hu Zhaoyi. Project cost of 500kV transmission lines[J]. Electrical Power, 1984(3): 1-5. [18] 戴罕奇, 梅红伟, 王黎明, 等. 复合绝缘子弱憎水性状态描述方法I——静态接触角法的适用性[J]. 电工技术学报, 2013, 28(8): 34-47. Dai Hanqi, Mei Hongwei, Wang Liming et al. Descrip- tion method I—for unobvious hydrophobic state of composite insulators usability of contact angle method [J]. Transactions of China Electrotechnical Society, 2013, 28(8): 34-47. [19] 戴罕奇, 梅红伟, 王黎明, 等. 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 Hong-wei, Wang Li-ming et al. Description method for unobvious hydrophobic state of composite insulators II—uncertainty of hydro- phobic degree by spray grading method[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 240- 249. [20] 彭功茂. 复合绝缘子污秽试验方法的几个关键问题研究[D]. 北京: 清华大学, 2011. [21] 牛康. 温、湿度对硅橡胶材料憎水迁移特性的影响 [D]. 北京: 清华大学, 2012. 6. [22] 朱定一, 张远超, 戴品强, 等. 润湿性表征体系及液固界面张力计算的新方法(Ⅱ)[J]. 科学技术与工程, 2007, 7(13): 3063-3069. Zhu Dingyi, Zhang Yuanchao, Dai Pinqiang, et al. Novel characterization of wetting properties and the calculation of liquid-solid interface tension(II)[J]. Science Technology and Engineering, 2007, 7(13): 3063-3069. [23] DL/T 859—2004. 高压交流系统用复合绝缘子人工污秽试验[S]. 北京: 中国电力出版社, 2004.
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