修复液预注入对电缆电树引发及树枝生长的抑制
Inhibition Effect of Prior Injection Rejuvenation Liquid on Initiation of Electrical Tree and Propagation of Tree in Cables
作者：周凯(四川大学 电气信息学院, 四川 成都 610065)；谢敏(四川大学 电气信息学院, 四川 成都 610065)；何珉(四川大学 电气信息学院, 四川 成都 610065)；黄明(四川大学 电气信息学院, 四川 成都 610065)；侯振奇(四川大学 电气信息学院, 四川 成都 610065)；赵世林(四川大学 电气信息学院, 四川 成都 610065)
Author：ZHOU Kai(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)；XIE Min(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)；HE Min(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)；HUANG Ming(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)；HOU Zhenqi(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)；ZHAO Shilin(School of Electrical Eng. and Info., Sichuan Univ., Chengdu 610065, China)
收稿日期：2016-06-21 年卷（期）页码：2017,49(4):167-173
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：交联聚乙烯;操作过电压;水树;电树;修复液
Key words：cross linked polyethylene;switching overvoltage;water tree;electric tree;rejuvenation liquid
基金项目：国家自然科学基金资助项目（51477106）
中文摘要
为了研究在交流电压和操作过电压下预先注入修复液对交联聚乙烯电缆中电树的引发和树枝生长的抑制，利用压力注入装置向新电缆样本缆芯注入有机硅修复液，形成预修复电缆样本，然后利用交流高压水针电极法对预修复电缆和未预修复电缆进行加速水树老化，并定期施加操作过电压。通过光学显微镜观察两种电缆样本不同老化时期的树枝生长情况，统计其平均树枝长度和电树引发率，并利用扫描电镜和能谱仪分析预修复电缆绝缘中微观结构和化学元素，结果说明预修复电缆中含有修复液生成物，且能抑制电树的引发和树枝的生长。利用有限元仿真软件建立电缆中树枝缺陷的仿真模型，并仿真分析操作过电压和交流电压下预修复电缆和未预修复电缆中树枝的电场特性，结果表明修复液能降低水针尖端、电树尖端和水树末梢的电场。研究结果表明：预修复能均匀水针尖端电场，降低操作过电压下的电树引发率，也能减弱电树尖端和水树末梢的电场强度，抑制树枝的生长。
英文摘要
In order to investigate the inhibition effect of prior rejuvenation on the initiation of electrical tree and the propagation of the tree in the cross-linked polyethylene cable under combined AC voltage and switching overvoltage,the prior rejuvenation cable samples were prepared by injecting siloxane liquid into the core of new cables with a pressure,and the new cable samples and the prior rejuvenation cable samples were subjected to accelerated aging experiment using the water-needle electrical method and subjected to the switching overvoltage.By optical microscope,the propagation of the branches in the cable samples were observed,and its average length of branches and electrical tree initiation rate were calculated,at different aging stages,and the microstructure and chemical elements in the prior rejuvenation cable insulation were analyzed by SEM and EDS,and the results show that the repaired cable contains the repair fluid product,which can inhibit the initiation of electric tree and the growth of trees.The simulation model of the trees in the cable was established by using the finite element simulation software,and the electric field distributions of the trees in the prior rejuvenation cable and the new cable were analyzed under the AC voltage and the switching overvoltage,and the results show that the rejuvenation liquid can reduce the electric field strength of the water needle tip,the electrical tree tip and water tree terminals.The results show that:the prior rejuvenation can uniform electric field of the water needle tip and reduce the electrical tree initiation rate under the switching overvoltage,but also can weaken the electric field of the electrical tree tip and water tree terminals,and inhibit the branch growth in XLPE cables.
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