复合与瓷和玻璃绝缘子直流覆冰闪络特性比较

发布时间：2018-08-26 13:31

【摘要】：污秽覆冰环境下绝缘子电气特性是覆冰地区输电线路外绝缘选择的基础,然而国内外针对不同材质绝缘子覆冰闪络特性的对比研究甚少。为此,在人工气候室内模拟覆冰气象条件,采用恒压升降法对3种不同材质绝缘子进行了大量覆冰直流闪络试验研究。分析试验结果得出了目前常用3种绝缘子在覆冰污秽条件下的直流闪络特性,结果表明:严重覆冰条件下,复合绝缘子电弧闪络梯度略高于瓷和玻璃绝缘子,且其污秽特征指数略小;覆冰水电导率和表面污秽对电弧闪络梯度的影响特征指数有明显差异。最后提出了绝缘子串覆冰水电导率及表面污秽共同作用时的直流电弧闪络梯度校正公式。研究结果可为覆冰地区输电线路外绝缘的选择和设计提供参考。
[Abstract]:The electrical characteristics of insulators in polluted ice-covered environment are the basis for the selection of external insulation for transmission lines in ice-covered areas. However, there are few comparative studies at home and abroad on the ice-flashover characteristics of insulators of different materials. For this reason, a large number of icing direct current flashover tests were carried out on three kinds of insulators of different materials by using constant pressure lifting method to simulate icing meteorological conditions in artificial climate room. The DC flashover characteristics of three kinds of insulators in common use are obtained by analyzing the test results. The results show that the arc flashover gradient of composite insulators is slightly higher than that of porcelain and glass insulators under severe icing conditions. The pollution characteristic index is a little small, and the influence of water conductivity and surface contamination on arc flashover gradient is obviously different. Finally, the formula of DC arc flashover gradient correction for the interaction of insulator string ice water conductivity and surface contamination is proposed. The results can provide a reference for the selection and design of external insulation of transmission lines in icing area.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2009CB 724501/502/503) 国家创新研究群体基金(51021005)~~
【分类号】：TM216

【参考文献】