直流预压幅值及时间对XLPE中接地电树枝引发特性的影响  

Influence of DC Pre-stress Amplitude and Time on Initiation Characteristics of Grounded Electrical Tree in XLPE

作　　者：刘贺晨[1] 徐晓彬 刘爱静 张铭嘉 刘云鹏[1,2] 李演达 LIU Hechen;XU Xiaobin;ZHANG Aijing;ZHANG Mingjia;LIU Yunpeng;LI Yanda(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003 [2]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《绝缘材料》2019年第12期65-70,共6页Insulating Materials

基　　金：国家重点研发计划(2016YFB0900705);河北省自然科学基金资助项目(E2018502133);中央高校基本科研业务费专项资金资助(2018MS079)

摘　　要：为了研究直流预压对交联聚乙烯中直流接地电树枝引发特性的影响,在不同预压时间下进行了不同电压的直流接地电树枝试验。结果表明:直流接地电树枝的长度随着预压幅值的增加而增大,并且具有明显的极性效应。当直流预压幅值较低时,接地电树枝的长度随预压时间的增加变化较小;当预压幅值远高于接地电树枝的引发电压时,接地电树枝的长度随预压时间增加而显著增加;负极性接地电树枝的长度远大于正极性接地电树枝,且生长分散性更大。In order to study the effect of DC pre-stress on the initiation characteristics of grounded electrical tree in XLPE, the grounded electrical tree tests under different voltage and pre-stress time were conducted. The results show that the length of grounded electrical tree increases with the increase of pre-stress amplitude, and the polarity effect is obvious. When the pre-stress amplitude is low, the length of grounded electrical tree changes little with the increase of pre-stress time. When the pre-stress amplitude is much higher than the initiation voltage of electrical tree, the length of grounded electrical tree increases obviously with the increase of pre-stress time. The length of electrical tree under negative polarity is much longer than that under positive polarity, and their growth is more dispersive.

关 键 词：直流预压 交联聚乙烯 直流接地电树枝 极性效应 空间电荷 

分 类 号：TM215[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]