机械应力与电压频率对XLPE电缆电树的影响  

The Influence of Residual Mechanical Stress and Voltage Frequency on Electrical Tree in XLPE

作　　者：郑晓泉[1] G Chen 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]英国南安普敦大学电子与计算机科学系

出　　处：《高电压技术》2003年第4期6-8,共3页High Voltage Engineering

摘　　要：实验研究了机械应力和电压频率对 XL PE电缆绝缘中电树枝起始特性、生长特性及电树枝结构的影响。研究发现 ,与不含应力试样相比 ,含有机械应力的 XL PE试样中电树枝的引发时间短 ,生长速度快 ,且低频下生长的电树枝常有类似于松树枝的结构 ,高频下均为单纯稠密枝状结构。无应力试样中低频电树枝则为枝状或枝状与局部丛林状共存的混合结构。In this paper, both the initiation and growth of electrical trees under high electric stress has been studied in cross linked polyethylene to explore the effects of the internal mechanical stress. It was found that in the samples containing mechanical stress around the tip the initiation time is significantly shorter and growth rate is faster compared with those in the sample without mechanical stress. The effect of internal mechanical stress and the frequency of the applied voltage both on the structure of electrical tree have also been investigated. When internal mechanical stress exist, the results indicate that if it grows at low frequency the tree often has a structure of pine branch like or some part with branch and other part with pine like. If internal mechanical stress does not exist, the tree often has a structure of thin branch or branch plus bush complex structure in low growing frequency.

关 键 词：塑料绝缘电力电缆 XLPE电缆 电树 机械应力 电压频率 老化 

分 类 号：TM215.1[一般工业技术—材料科学与工程] TM247[电气工程—电工理论与新技术]