污秽成分对LXY<sub>4</sub>—160绝缘子串交流闪络特性的影响

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摘要自然条件下绝缘子表面的积污成分呈多样性, 而污秽成分差异对绝缘子污闪电压有影响。本文以7片LXY₄—160标准玻璃绝缘子串为研究对象, 试验研究其在不同污秽成分下的交流闪络特性, 结合不同污秽成分下绝缘子表面污层电导率和泄漏电流的测量结果, 分析了污秽成分对绝缘子串交流闪络特性的影响, 研究结果表明：改变污秽成分中可溶性物质和不溶性物质的比例, 均对污闪电压有影响；对于可溶性物质, 绝缘子的污闪电压随着NaCl比例减小、CaSO₄比例增加而升高；对于不溶性物质, 绝缘子的污闪电压随着SiO₂、Al₂O₃和Fe₂O₃混合物比例变化而产生相应的改变；不同污秽成分下绝缘子表面污层电导率和泄漏电流存在差异, 影响局部电弧的产生和发展过程, 最终导致绝缘子污闪电压存在差异；自然积污研究中仅利用等值盐密无法表征自然积污程度。研究结果对输电线路外绝缘设计和选择具有一定的参考价值。

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关键词 ：绝缘子, 附盐密度, 污秽成分, 闪络电压, 污液电导率, 泄漏电流

Abstract：The compositions of pollution on insulator are various, and the diversity of the composition has an effect on the flashover voltage of the insulator. In this paper a 7-unit standard LXY₄—160 glass insulator string is taken as the research subject and its AC flashover characteristics with different compositions of contamination is studied. By combining the test data of the surface pollution layer conductivity and leakage current the effect of the compositions of pollution on the AC flashover characteristics of the insulator string is analyzed. The result shows that the change of soluble or non-soluble compositions will affect the flashover voltage. The flashover voltage of the insulator string grows with the decrease of NaCl content and the increase of CaSO₄ content. Moreover, the flashover voltage also changes along with the change of SiO₂, Al₂O₃ and Fe₂O₃ contents. The variation of the surface pollution layer conductivity and leakage current does exist under different compositions of contamination, and it will affect both the occurring and developing process of partial arc, leading to the change of flashover voltage finally. It is unreasonable to describe the pollution level only using ESDD(equivalent salt deposit density) in natural pollution research. The research results will be of certain values for references to outdoor insulation design and selection.

Key words： Insulator salt deposit density(SDD) pollution composition flashover voltage conductivity of polluted liquid leakage current

收稿日期: 2013-05-28 出版日期: 2014-06-27

PACS:

TM852

基金资助:国家重点基础研究发展计划(973计划)资助项目(2009CB724503)

作者简介: 张志劲, 男, 1976年生, 教授, 博士生导师, 主要研究方向为复杂环境下输电线路外绝缘技术、电力系统过电压与绝缘配合; 张东东, 男, 1991年生, 博士研究生, 研究方向为高电压与绝缘技术。

引用本文:

张志劲, 张东东, 刘小欢, 蒋兴良, 胡建林. 污秽成分对LXY₄—160绝缘子串交流闪络特性的影响[J]. 电工技术学报, 2014, 29(4): 298-305. Zhang Zhijin, Zhang Dongdong, Liu Xiaohuan, Jiang Xingliang, Hu Jianlin. Effect of Pollution Compositions on the AC Flashover Performance of LXY₄—160 Suspension Glass Insulator String. Transactions of China Electrotechnical Society, 2014, 29(4): 298-305.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I4/298

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