电缆终端应力锥错位缺陷对界面温度及应力分布的影响  

Influence of Cable Terminal Stress Cone Dislocation Defect on Interface Temperature and Stress Distribution

作　　者：祝贺[1] 何峻旭 郑亚松 曹煜锋 郭维 Zhu He;He Junxu;Zheng Yasong;Cao Yufeng;Guo Wei(Jilin Province Transmission Engineering Safety Technology Engineering Laboratory Northeast Electric Power University,Jilin 132000,China)

机构地区：[1]东北电力大学输电工程安全技术工程实验室,吉林132000

出　　处：《电工技术学报》2024年第1期65-75,共11页Transactions of China Electrotechnical Society

基　　金：吉林省科技发展计划资助项目(20230203136SF)。

摘　　要：电缆终端内部缺陷会造成终端内部电场分布不均、局部温度升高与应力分布变化,可能引发局部放电造成绝缘击穿。为研究终端应力锥错位缺陷对电缆界面温度及应力分布的影响,分别建立了电缆终端安装不足与安装过盈情况下的电缆终端错位缺陷模型,并进行电-热-力多物理场耦合仿真分析。结果表明:电缆终端绝缘屏蔽层截断处是电缆终端的薄弱部位,终端界面温度和界面压力都会在绝缘屏蔽层截断处发生突变。当电缆终端存在安装不足缺陷时,终端屏蔽层截断处与应力锥根部之间会出现电场升高区域,在安装位置为-7.5 mm时界面温度最高,绝缘界面压力值升高,且安装位置为-2.5mm时绝缘承受的压力值最大;当电缆终端存在安装过盈缺陷时,绝缘屏蔽层截断处会发生电场畸变,电场突变量随着偏移量的增加而增大,在安装位置为+5.0mm时绝缘界面压力值最大,且界面压力突变量增加发生畸变。因此,在电缆终端实际设计安装与运行维护中,额外注意应力锥错位缺陷对终端内部应力分布的影响十分必要。As an important part of the prefabricated cable terminal,the stress cone structure can alleviate the concentration of the electric field strength at the cut-off of the insulation shielding layer during the operation of the cable terminal.However,in the installation and construction of the cable terminal,due to the influence of the installation process and operating conditions,the cable terminal will have a stress cone dislocation defect,which will affect the uniform distribution of the terminal electric field;at the same time,the increase in cable core and insulation temperature will lead to a change in the thermal stress distribution in the terminal and affect the thermal stress distribution in the terminal.At present,the research on cable terminal defects mainly focuses on electro thermal aspects,while there are few studies on their internal stress distribution.In this paper,the electro-thermal-mechanical multi-physical field coupling simulation analysis of the dislocation defect cable terminal is carried out to analyze the changes in electric field strength,temperature distribution,and stress distribution in the operation of terminal defects.During the operation of the cable terminal,the heat source is formed due to the electromagnetic loss,which leads to the change of the internal temperature of the terminal,and then the thermal stress and deformation of the terminal are generated by the thermal expansion of the material.Firstly,the physical field control equations of the cable terminal are established and the coupling relationship between the physical fields is analyzed.Then,the cable terminal model and the stress cone dislocation defect model are established,and the material parameters and boundary conditions are set and simulated.Finally,by comparing the maximum electric field strength,temperature change,and interface pressure distribution under the condition of a cable terminal defect,the influence of a stress cone dislocation defect on terminal temperature and stress is obtained,and suggestions are given

关 键 词：电缆终端 应力锥错位缺陷 电缆界面应力 电-热-力多物理场耦合 

分 类 号：TM853[电气工程—高电压与绝缘技术]