热老化对直流XLPE绝缘性能的影响研究  

Study on Effect of Thermal Aging on the Insulation Performance of DC XLPE

作　　者：刘继平 王浩鸣[1] 唐庆华[1] 于凡[3] 韩宝忠 LIU Jiping;WANG Haoming;TANG Qinghua;YU Fan;HAN Baozhong(Electric Power Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300384,China;Maintenance Company,State Grid Tianjin Electric Power Company,Tianjin 300321,China;State Grid Global Energy Interconnection Research Institute,Beijing 102211,China;Key Laboratory of Engineering Dielectrics and Its Application of Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Shanghai Qifan Cable Co.,Ltd,Shanghai 201514,China)

机构地区：[1]国网天津市电力公司电力科学研究院,天津300384 [2]国网天津市电力公司检修公司,天津300321 [3]国网全球能源互联网研究院,北京102211 [4]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 [5]上海起帆电缆股份有限公司,上海201514

出　　处：《电力系统及其自动化学报》2020年第7期80-85,共6页Proceedings of the CSU-EPSA

基　　金：国家电网公司科技基金资助项目(520314160006,SGTJDK00PJJS1600017)。

摘　　要：针对直流电缆交联聚乙烯的绝缘热老化,对比了国际商用直流电缆料(LE4253DC)与纳米氧化硅(SiO2)改性直流绝缘料两种材料在热老化前后电导率、击穿强度和空间电荷的特性变化。试验结果表明:随着老化温度的升高,LE4253DC的电导率先下降再升高,击穿强度整体下降,出现大量空间电荷。SiO2改性后,不同温度梯度下的电导率性能均有所提升,低温下的击穿特性较为稳定,异极性空间电荷得到了抑制。Considering the insulation performance of cross-linked polyethylene used in DC cable after thermal aging,the electrical conductivity,breakdown strength and changes in the space charge characteristics of one kind of international commercially available DC cable material(i.e.,LE4253 DC)and SiO2 nano-modified DC insulators were compared before and after thermal aging. Experimental results show that with the increase in aging temperature,the conductivity of LE4253 DC decreased first and then increased,and its breakdown strength decreased as a whole,resulting in a large number of space charge. After modification,the electrical conductivity of SiO2 was improved at different temperature gradients,its breakdown characteristics were relatively stable at low temperature,and the corresponding heteropolar space charge was suppressed.

关 键 词：直流电缆 交联聚乙烯 纳米改性 热老化 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]