盐雾条件下染污绝缘子交流污闪特性

doi:10.19595/j.cnki.1000-6753.tces.151720

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摘要染污绝缘子表面污秽在盐雾中吸湿受潮,雾中的盐分沉积在绝缘子表面增大了其表面电导率,使得绝缘子闪络特性降低,绝缘子可能在较低电压甚至工作电压下发生闪络,威胁电网的安全稳定运行。本文对瓷、玻璃、复合三种典型绝缘子在不同盐密（SDD）和雾水电导率（γ₂₀）下的交流闪络特性进行试验研究,提出附加盐密（ASDD）的概念,分析了附加盐密与绝缘子表面盐密和雾水电导率的关系及其对交流闪络特性的影响。结果表明：随着盐密和雾水电导率的增大绝缘子交流雾闪电压均降低,且与盐密呈负幂指数关系,与雾水电导率呈线性关系。可以用附加盐密表征雾水电导率和盐密对绝缘子雾闪电压的综合影响,即附加盐密与雾水电导率和绝缘子盐密之积成正比。同时绝缘子闪络电压与绝缘子表面盐密和附加盐密之和呈负幂指数关系,绝缘子雾闪的本质是一种特殊的污秽闪络。

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	郭裕钧
	蒋兴良
	孟志高
	李源军
	高标

关键词 ：雾水电导率, 附加盐密, 污染, 交流闪络特性, 盐雾

Abstract：The surface pollution of polluted insulators absorbs fog water and damps in the salt fog. Meanwhile, the salt in the salt fog deposits on insulators surface, which increases the surface conductivity and degrades the flashover performance of insulators. Insulators may flashover under lower voltage level even under operating voltage. This will threaten the safe and stable operation of the power grid. In this paper, experiments on three typical insulators, i.e. porcelain, glass and composite insulators, were conducted in different salt deposit densities (SDD) and fog water conductivities (γ₂₀). The concept of additional salt deposit density (ASDD) was proposed to analyze the relationship among ASDD, SDD and fog water conductivity. The test results show that the ac flashover voltage decreases with the increases of both SDD and fog water conductivity, which has a negative exponential relationship with SDD while a linear relationship with fog water conductivity. The ASDD can be applied to analyze the combined effects of SDD and fog water conductivity. The relation between the fog flashover voltage and SDD and ASDD is a negative power exponent. The fog flashover can be treated as a special kind of pollution flashover.

Key words： Fog water conductivity additional salt deposit density pollution AC flashover characteristics salt fog

收稿日期: 2015-10-20 出版日期: 2017-07-19

PACS:

TM852

基金资助:国家重点基础研究发展计划（973计划）（2014CB260401）,输配电装备及系统安全与新技术国家重点实验室自主重点项目（2007DA10512714101）和国家创新研究群体基金（51021005）资助

通讯作者: 郭裕钧男,1989年生,博士研究生,研究方向为复杂大气环境中输电线路外绝缘、输电线路覆冰及防护。E-mail: gyjcqu@126.com

作者简介: 蒋兴良男,1961年生,教授,博士生导师,研究方向为复杂大气环境中输电线路外绝缘、输电线路覆冰及防护。E-mail: xljiang@cqu.edu.cn

引用本文:

郭裕钧, 蒋兴良, 孟志高, 李源军, 高标. 盐雾条件下染污绝缘子交流污闪特性[J]. 电工技术学报, 2017, 32(13): 248-254. Guo Yujun, Jiang Xingliang, Meng Zhigao, Li Yuanjun, Gao Biao. AC Pollution Flashover Characteristics of Polluted Insulators under Salt Fog Conditions. Transactions of China Electrotechnical Society, 2017, 32(13): 248-254.

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