典型工业粉尘地区复合绝缘子污秽成分及其闪络特性

近年来，盐城德隆镍业厂区附近数次发生输电线路外绝缘放电、污闪现象，且采用复合绝缘子后仍不能得到有效抑制，而临近的化工区却没无该情况发生。因此，本文对盐城电网辖区内镍厂、化工厂绝缘子进行污秽取样，开展了污秽化学成分分析测试，包括阴阳离子含量、不溶物元素组成、主要化合物成分等；继而基于成分分析结果，开展了混合污秽下的污闪特性试验，得到了不同污染源典型污秽成分下复合绝缘子的闪络特性。研究结果表明：化工厂和镍厂附近绝缘子污秽成分有一定的差异，体现在镍厂污秽成分含硝酸盐较多，而化工厂附近含氯盐较多；对于一大两小型复合绝缘子，其在镍厂典型污秽下的闪络梯度要比化工厂低5%-10%；对于重工业粉尘地区的外绝缘配置，建议采用一大一小型绝缘子来提高电气强度。

Pollution constitutes and flashover characteristics of composite insulators in typical industrial dust areas

In recent years, the external insulation discharge and pollution flashover of transmission lines have occurred several times in the vi-cinity of the Delong Nickel Plant in Yancheng, and the use of composite insulators still cannot be effectively suppressed, but this has not happened in the nearby chemical zone. Therefore, this article conducted pollution sampling of insulators in nickel plants and chemical plants within the jurisdiction of Yancheng Power Grid, and carried out analysis and testing of pollution chemical compo-nents, including anion and cation content, insoluble element composition, main compound composition, etc.; Then, based on the re-sults of component analysis, a pollution flashover characteristic test under mixed pollution was carried out, and the flashover charac-teristics of composite insulators under typical pollution components of different pollution sources were obtained. The results of the study show that there is a certain difference in the pollution components of insulators near chemical plants and nickel plants, which is reflected in the fact that the pollution components of nickel plants contain more nitrates, while those near chemical plants contain more chloride salts; For one large and two small composite insulators, the flashover gradient under the typical pollution of nickel plants is 5%-10% lower than that of chemical plants; For the external insulation configuration in heavy industrial dust areas, it is recommended to use one large and one small insulator to improve the electrical strength.