摘要
为了研究热老化条件下高压电缆终端接头内涂覆硅脂对交联聚乙烯绝缘/硅橡胶绝缘复合界面多物理场分布的影响,采用COMSOL Multiphysics软件建立了110 kV电缆终端接头电-热-力多物理场模型,仿真分析了热老化下涂覆硅脂前后复合界面电场、温度场以及应力场的分布。结果表明:界面涂覆硅脂后,增加了界面的密封性,使界面电场畸变程度减小,界面温升略微下降,但界面应力呈现不均匀分布。老化后,硅脂对硅橡胶的溶胀造成硅橡胶相对介电常数升高,界面电荷密度增大,电场强度进一步增大。温度升高加剧了硅脂对硅橡胶的渗透,使硅橡胶材料热导率降低,界面温度较老化前升高。老化后,涂覆硅脂的硅橡胶弹性模量大幅降低,界面应力进一步减小。
In order to study the effect of coating silicone grease on the distribution of multiple physical fields at the crosslinked polyethylene/silicone rubber composite interface under thermal ageing,the electrical-thermal-mechanical multi-physics field model of 110 kV cable terminal joints was established using COMSOL Multiphysics software.The distribution of electric field,temperature field,and stress field at the composite interface before and after coating silicone under thermal ageing was simulated.The results show that after coating with silicone grease,the sealing degree of the interface increases,which decreases the distortion degree of the electric field and leads to the slight decrease of the temperature rise of the interface,but the stress of the interface distributes unevenly.After ageing,the swelling of silicone grease on silicone rubber increases the relative dielectric constant of silicone rubber,and the interfacial charge density,and causes the electric field strength increase further.The increase of temperature promotes the penetration of silicone grease to silicone rubber,which decreases the thermal conductivity of silicone rubbe and make the interface temperature higher than that before ageing.Under thermal ageing,the elastic modulus of the silicone rubber coating with silicone grease decreases significantly and the interfacial stress decreases further.
作者
张巍
韩圣斌
李秀峰
刘正第
魏凯
ZHANG Wei;HAN Shengbin;LI Xiufeng;LIU Zhengdi;WEI Kai(College of Electric and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Seven Star Electric Technology Development Co.,Ltd.,Zibo 255000,China)
出处
《绝缘材料》
CAS
北大核心
2024年第6期76-85,共10页
Insulating Materials
基金
淄博市张店区校城融合发展计划项目(2021JSCG0009)。
关键词
电缆终端接头
电-热-力
硅脂
绝缘老化
cable termination joints
electrical-thermal-mechanical
silicone grease
insulation ageing
