电气工程学报 ›› 2021, Vol. 16 ›› Issue (3): 170-176.doi: 10.11985/2021.03.023

• 高电压与绝缘技术 • 上一篇    下一篇

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喀斯特山地垭口地貌影响下直流线路复合绝缘子伞裙老化特性分析*

赵伟1(), 陈荣盛1, 江渺2, 吴昊1, 邱子针1, 樊柄宏1, 李黎2()   

  1. 1.中国南方电网超高压输电公司天生桥局 贵州 562400
    2.华中科技大学电气与电子工程学院 武汉 430074
  • 收稿日期:2020-11-05 修回日期:2021-03-18 出版日期:2021-09-25 发布日期:2021-10-29
  • 通讯作者: 李黎 E-mail:408924409@qq.com;leeli@hust.edu.cn
  • 作者简介:* 李黎,男,1976年生,博士,教授。主要研究方向为电力设备智能化运行与维护。E-mail: leeli@hust.edu.cn
    赵伟,男,1985年生,高级工程师。主要研究方向为输电线路运行维护。E-mail: 408924409@qq.com
  • 基金资助:
    * 中国南方电网超高压输电公司科技资助项目(010700KK52190003)

Analysis on Aging Characteristics of the Sheds of DC Composite Insulator under the Influence of Karst Mountain Col Geomorphology

ZHAO Wei1(), CHEN Rongsheng1, JIANG Miao2, WU Hao1, QIU Zizhen1, FAN Binghong1, LI Li2()   

  1. 1. Tianshengqiao Bureau, Southern Power Grid EHV Power Transmission Company, Guizhou 562400
    2. School of Electrical and Electronic Engineering, Huazhong University of Science & Technology, Wuhan 430074
  • Received:2020-11-05 Revised:2021-03-18 Online:2021-09-25 Published:2021-10-29
  • Contact: LI Li E-mail:408924409@qq.com;leeli@hust.edu.cn

摘要:

为研究运行于喀斯特山地垭口地区直流线路复合绝缘子伞裙老化特性的特殊性,从喀斯特山地垭口及平原地区分别选取相同运行年限的绝缘子,进行伞裙憎水性、积污量和污秽成分的测试,对比分析了二者伞裙性能表现出的差异,并讨论了引起此种差异的可能影响因素。结果表明,运行于喀斯特山地垭口处的直流复合绝缘子伞裙整体老化程度偏重,这是受该地区特殊地形、气象和污秽成分等因素的共同影响造成的。垭口的强风经过伞裙会产生应力集中,使得伞裙根部出现裂纹;若酸性液体从表面及裂纹渗入,则会加速内部硅橡胶的裂解和老化;同时伞裙表面富集的碳酸盐在酸性环境下会逐渐转化为更有腐蚀性的硫酸根离子,引起伞裙表面粉化及腐蚀等现象。

关键词: 复合绝缘子, 喀斯特, 垭口地貌, 伞裙, 老化特性

Abstract:

In order to study the particularity of the aging characteristics of DC composite insulator sheds operating in the karst mountain col area, insulators with the same operating life from the karst mountain col and plain areas are selected. Shed hydrophobicity, contamination quantity and composition are tested, then performance differences between the two are compared, and the possible influencing factors that cause such differences are discussed. The results show that the overall aging degree of the DC composite insulator sheds operating at the karst mountain col area is rather serious, which is caused by the combined influence of factors including the special terrain, weather, and pollution in the area. The strong wind passing through the sheds will cause stress concentration, leading to cracks at the root of the shed; the penetration from the surface and cracks of acid liquid, if any, will accelerate the cracking and aging of the internal silicone rubber; moreover, the carbonates enriched on the shed surface will gradually transform into more corrosive sulfate ions in an acidic environment, leading to pulverization and deeper corrosion of the shed surface.

Key words: Composite insulator, karst, col geomorphology, shed, aging characteristics

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