交联聚乙烯电力电缆电树枝生长的混沌特性分析  

The Chaos Characteristics Analysis for Electrical Treeing Propagation in XLPE Power Cables

作　　者：廖瑞金[1] 周天春[1] 刘玲 周湶[1] 汪可[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]广州供电局,广州510620

出　　处：《电工技术学报》2012年第5期63-69,共7页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)(2009CB724505-1)资助项目

摘　　要：采用实际的XLPE电缆作为试验样品,以针尖模拟电场应力的集中,开展了工频12～21kV电压和常温到70℃下的电树枝化试验;引入了混沌理论分析电树枝生长的过程,并以电树枝局部放电单位时间内的最大放电量和总放电量作为分析对象,结合电树枝的生长的物理机理,分析了电树枝生长的混沌特征。结果显示XLPE电缆电树枝的生长过程具有确定性混沌特性,电树枝混沌特征的最大Lyapunov指数和关联分形维数值表现出随树枝分形维数的增大而减小的趋势。In this paper, an actual 15kV XLPE cable was used to test electrical tree, and its electrical stress enhancing was simulated by a metal needle defect. The growth of electrical trees was detected by the digital partial discharge （PD） measurement, and the structures were observed by optical microscopy. The chaos analysis for the time series of maximal and total PD data indicates that the propagation of the electrical trees show the characteristics of the deterministic chaos. And its maximal Lyapunov exponent and correlation dimension of the strange attractors increase with the decrease of the fractal dimension of the trees.

关 键 词：交联聚乙烯电缆 电树枝 局部放电 混沌 分形维 

分 类 号：TM835[电气工程—高电压与绝缘技术]