热老化XLPE电缆绝缘的介电击穿行为的研究  

Investigation of the Dielectric Breakdown Behavior of Thermally Aged XLPE Cable Insulation

作　　者：金天雄[1,2] 刘飞[1] 江平开[1] 金石南 李哲凡[2] 

机构地区：[1]上海交通大学电气材料与绝缘研究中心,上海200240 [2]朝鲜金策工业综合大学电气工程系 [3]朝鲜326电线电缆厂

出　　处：《电线电缆》2008年第6期28-31,39,共5页Wire & Cable

基　　金：国家自然科学基金项目资助(项目:50677037)

摘　　要：击穿强度通常是用来表征检测和使用过程中的绝缘材料状态和质量的指标之一。尽管有许多报道对聚乙烯(PE)和交联聚乙烯(XLPE)的击穿电压进行了研究,但是对热老化后的交联聚乙烯电缆的击穿行为的研究不是太多。表征威布尔统计分布参数,即范围和形状参数与分子结构、物理和化学缺陷的含量和形状以及其他的物理化学性能有密切的关系。本文的目的是研究不同热老化程度的XLPE电缆的威布尔统计分布参数的变化行为。研究结果显示威布尔参数变化对XLPE绝缘材料的热老化程度是非常敏感的,利用威布尔参数与热老化程度的关系可以有效地诊断PE和XLPE电缆绝缘材料。Generally, breakdown strength is used, as one of the indicators, to characterize and measure the state and quality of insulation materials in the application. There have been many reports on the study of the breakdown voltage of PE and XLPE though, not much study works have been carried out on the dielectric breakdown behavior of thermally aged XLPE cables. The parameters characterize the Weibull statistical distribution, i.e. the scale and shape parameters, are intimately related with the molecular construction, content and shape of physical and chemical defects and other physical/chemical properties. The object of this paper is to study the variation in the parameters of Weibull statistical distribution for XLPE cables with different degree of thermal ageing. The results showed that the Weibull parameters were sensitive to the degree of thermal ageing of XLPE insulation; that the relationship between Weibull parameters and the degree of thermal ageing could be used to effectively diagnose PE and XLPE insulation.

关 键 词：XLPE电缆绝缘料 热老化 击穿 威布尔统计分布 威布尔统计分布参数 

分 类 号：TM247.1[一般工业技术—材料科学与工程]