XLPE绝缘高压直流电缆终端内缺陷对电场分布的影响  

Effect of the defects inside XLPE insulated HVDC cable termination on the electric field distribution

作　　者：李长明 伍国方 李春阳[1] 周扬 侯帅 韩宝忠[1,4] LI Chang-ming;WU Guo-fang;LI Chun-yang;ZHOU Yang;HOU Shuai;HANBao-zhong(Key Laboratory of Engineering Dielectrics and Its Application of the Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;State Grid Heilongjiang Electric Power Company Limited Electric Power Research Institute,Harbin 150030,China;Electric Power Research Institute,China Southern Powder Grid,Guangzliou 510080,China;Shanghai Qifan Cable Co.,Ltd.,Shanghai 201514,China)

机构地区：[1]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080 [2]国网黑龙江省电力有限公司电力科学研究院,哈尔滨150030 [3]南方电网科学研究院有限责任公司,广州510080 [4]上海起帆电缆股份有限公司,上海201514

出　　处：《电机与控制学报》2018年第12期62-67,共6页Electric Machines and Control

基　　金：国家自然科学基金(51337002);中国南方电网有限责任公司(KY2014-502)

摘　　要：为了研究以非线性硅橡胶作为增强绝缘的交联聚乙烯(XLPE)绝缘高压直流电缆终端内部存在缺陷时对其电场分布特性的影响,利用多物理场耦合软件仿真研究了无缺陷和含有典型缺陷直流电缆终端内的电场分布规律。研究结果表明:非线性硅橡胶作为增强绝缘具有较强的均化电场分布的能力,使无缺陷直流电缆终端内最大电场分布于电缆主绝缘内;当应力锥安装错位时,电场畸变程度随电缆外屏蔽超出应力锥根部距离增加而增大;当增强绝缘内有气孔时,电场主要集中在气孔附近,且最大电场强度超过空气的击穿场强;应力锥表面微小突起会使其附近处局部电场明显增强。In order to study the effect of defects inside the crosslinked polyetliylene(XLPE)insulated DC cable termination with nonlinear silicone rubber as reinforced insulation on the electrical field distribu-tion,the electric field distrilDution inside the DC cable termination witli and witliout typical defects is studied by finite element software in this paper.The results shows that tlie nonlinear silicone rubber used as reinforced insulation has a strong capacity to homogenize the electric field and keeps the maximum electric field inside the DC cable termination with no defects located in the major insulation of the cable.When the stress cone is under incorrect installation,the distortion degree of the electric field increases witli the distance that tlie cable external screen extends beyond the root of tlie stress cone.When gas gap exists in the reinforced insulation,the electric field mainly concentrates around the gas gap and the maximum electric field strengtli exceeds the breakdown strengtli of air.The small bulge on the surface of the stress cone obviously enhances the local electric field near the bulge.

关 键 词：交联聚乙烯 电缆终端 硅橡胶 缺陷 电场分布 

分 类 号：TM247[一般工业技术—材料科学与工程]