基于不同电极系统的电树枝生长特性的研究  

Growth Characteristics of Electrical Tree of Two Electrode Systems

作　　者：周湶[1] 叶笛[1] 安文斗[2] 廖瑞金[1] 陈仕军[1] 

机构地区：[1]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,重庆400044 [2]煤炭科学研究总院重庆研究院,重庆400037

出　　处：《高压电器》2010年第2期12-14,19,共4页High Voltage Apparatus

基　　金：国家杰出青年科学基金项目(50425722);煤炭科学研究总院技术创新基金项目

摘　　要：固体绝缘介质在电场应力集中处会发生树枝状放电并生成树枝状放电通道,为了研究在不同电场作用下固体绝缘介质中的电树枝特性的差异,采用实际交联聚乙烯(XLPE)电缆的短电缆电极系统,与常用的针-板电极系统分别在12、15、18、21 kV下进行电缆的树枝化实验。实验结果表明,短电缆电极系统与针-板电极系统得到的试验结果具有相同的趋势,电树枝的稠密程度随着电压的升高而增加,在相同电压下,短电缆电极系统的电树枝的发展速度比针-板电极系统慢,短电缆电极系统得到与针-板电极系统相同形态的电树枝的外施电压值要高。Electrical tree discharge channel will be formed at concentration position of electric field stress in solid insulation dielectrics due to electrical tree discharge. In order to study the characteristic difference of electrical tree under different electrical fields, a short-cable electrode system made of commercial XLPE cable was designed. Experiments on the short-cable electrode system and the common needle-plate electrode system were performed under 12kV, 15kV, 18kV, 21kV, respectively. Experimental results show that the electrical tree of short-cable electrode system has the same growth trend compared with the needle-plate electrode system, the densities of both eleetrieal trees increase with increasing voltage level, electrical tree of short-cable eleetrode system grows slower than the needle-plate electrode system under same voltage level, and the short-cable electrode system requires higher voltage level to achieve the same shape of electrieal tree as the needle-plate electrode system. The results show that the semiconductor and copper shield layers outside of XLPE cable have very important effect on degradation of electrical tree.

关 键 词：电树枝 交联聚乙烯 生长特征 电极系统 

分 类 号：TM83[电气工程—高电压与绝缘技术]