绝缘子自然污秽下受潮及导电特性分析

发布时间：2018-04-03 16:09

本文选题：自然污秽　切入点：导电性能　出处：《高电压技术》2014年12期

【摘要】：自然污秽物成分、污层受潮程度是影响绝缘子外绝缘性能的重要因素。为此,以江苏某变电站实际获得的自然污秽为例,通过污秽物成分分析,初步掌握了污秽物中的成分及含量,并利用污秽受潮试验装置开展了受潮特性比较及导电性能分析试验。试验结果表明:相同盐密、灰密及受潮条件下,该组自然污秽绝缘子的受潮速度比人工污秽绝缘子快,但充分受潮后,自然污秽绝缘子的表面电导值要低于人工污秽绝缘子;自然污秽物中不溶物占绝大部分,对绝缘子表面电导率贡献较小,可溶物中微溶于水的Ca SO4比例最大;自然污秽物含有机物成分,对绝缘子污闪性能有一定影响。通过比较分析己内酰胺(CPL)特性发现:己内酰胺为吸水性物质,本身无导电性,在低湿度条件下易使绝缘子污层受潮,引起表面电阻降低;但污层饱和受潮后,己内酰胺对表面导电性贡献可忽略,对绝缘子污闪电压的影响不大。
[Abstract]:The composition of natural contaminants and the degree of dampness are the important factors affecting the insulation performance of insulators.For this reason, taking the natural pollution obtained from a substation in Jiangsu Province as an example, through the analysis of the pollution composition, the composition and content of the polluted material are preliminarily grasped.In addition, the wet characteristics and conductivity analysis tests were carried out by using the polluted damp test device.The insoluble material is the majority of the natural filth, which contributes little to the surface conductivity of the insulator, and has the largest proportion of Ca SO4 which is slightly soluble in water in the soluble material, and the natural contaminant contains organic matter, which has certain influence on the insulator flashover performance.Caprolactam has little effect on insulator flashover voltage.
【作者单位】：国网江苏省电力公司电力科学研究院;清华大学深圳研究生院;国网江苏省电力公司;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209406)~~
【分类号】：TM216

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