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.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2003年第4期6-8,共3页
High Voltage Engineering
