摘要
在高压电气设备中使用非线性电场梯度绝缘材料可以有效缓解关键位置的电场集中。但具有优异非线性特性的复合介质往往需要掺杂大量无机填料,容易诱发填料团聚及其与基体的相容性差等问题,严重限制了复合介质在高压电气设备中的应用。因此,该文选用碳化硅晶须(SiCw)填充环氧树脂(EP)以改善其非线性特性,同时使用硅烷偶联剂(KH550)修饰SiCw,通过改善填料与基体的相容性进一步优化复合介质的绝缘性能。结果表明,与掺杂未修饰SiCw的复合介质相比,经1%KH550修饰的SiCw填料在基体中的分布更均匀,与环氧树脂的相容性更好。同时,用1%KH550改性的SiCw掺杂的复合材料实现了在低掺杂量下获得显著的非线性特性,并且在较高掺杂量下使击穿强度的下降得到明显的抑制。
The application of nonlinear electric field grading insulation composites can effectively alleviate the concentrated electric field at the key positions of high voltage electrical equipment.However,the composites with excellent nonlinear characteristics on conductivity often need to be doped with a large amount of inorganic fillers,which can easily induce the agglomeration of fillers and poor compatibility with the matrix.It has severely limited the application of the composites in the high voltage electrical equipment.Therefore,silicon carbide whiskers(SiCw)were selected to improve the nonlinear conductivity characteristics of epoxy resin(EP),and the coupling reagent(KH550)was used to modify SiCw and further optimize the insulation performance of the composite by improving the compatibility of the filler with matrix.The results show that,compared with the composite doped with unmodified SiCw,the SiCw fillers modified by 1%KH550 distribute more uniformly in the matrix and exhibit better compatibility with epoxy resin.At the same time,the composites doped with 1%KH550 modified SiCw have achieved remarkable nonlinear conductivity at lower doping content,and the decreased breakdown strength,especially at higher doping content,has been restrained obviously.
作者
迟庆国
崔爽
张天栋
杨蒙
陈庆国
Chi Qingguo;Cui Shuang;Zhang Tiandong;Yang Meng;Chen Qingguo(Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology,Harbin 150080 China;School of Electrical and Electronic Engineering Harbin University of Science and Technology,Harbin 150080 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第20期4405-4414,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(51807042)
黑龙江省自然科学基金团队项目(TD2019E002)资助。
关键词
环氧树脂
偶联剂修饰
非线性电导特性
击穿场强
Epoxy resin
silane coupling reagent modification
nonlinear conductivity
breakdown strength
作者简介
迟庆国,男,1981年生,博士,教授,研究方向为纳米电介质与绝缘。E-mail:qgchi@hotmail.com;通信作者:张天栋,男,1987年生,博士,讲师,研究方向为聚合物绝缘材料的非线性电导特性和储能特性。E-mail:tdzhang@hrbust.edu.cn。
