防火防爆盒安装状态下三芯电缆中间接头温度场仿真研究  

Study on Temperature Field Simulation of Three-core Cable Joint with Installation of Fire-proof and Explosion-proof Box

作　　者：陈杰 李陈莹 陶风波 刘建军 谭笑 胡丽斌 曹京荥 CHEN Jie;LI Chenying;TAO Fengbo;LIU Jianjun;TAN Xiao;HU Libin;CAO Jingying(Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,南京210000

出　　处：《高压电器》2024年第11期123-130,共8页High Voltage Apparatus

基　　金：国网江苏省电力有限公司科技项目(高低压混沟敷设电力电缆线路防火监测预警技术研究)。

摘　　要：电缆接头是电缆系统中故障率最高的部分,防爆盒可有效降低电缆接头故障造成的损害,而防爆盒的存在会对电缆接头温度产生影响。文中首先建立了10 kV三芯电缆接头及防爆盒的三维简化模型,运用Ansys仿真软件对该三维模型进行了电磁—热及电磁—热—流双向耦合仿真,分析了电缆接头不加防爆盒、防爆盒填充物为密封胶、防爆盒内无填充物3种情况下的温度场分布规律,之后分析了空气对流换热系数、环境温度和密封胶导热系数3种因素对加装防爆盒前、后接头峰值温度的影响。研究结果表明,接头加装防爆盒后,两种情况下接头温度均有所升高,防爆盒内无填充物时接头温度变化更大;随着换热系数的增大,加装防爆盒前、后的接头峰值温差逐渐增大;环境温度对加装防爆盒前、后接头峰值温度变化幅度的影响可忽略不计;密封胶导热系数增大到一定程度后有助于电缆接头载流量的提升。The cable joint is the part with the highest fault rate in the cable system,the damage due to cable joint fault can be effectively reduced by the explosion-proof box.However,the existence of explosion-proof box will affect the temperature of the cable joint.In this paper,the 3D simplified model of 10 kV three core cable joint and explosion-proof box is set up.The Ansys simulation software is used to simulate the electromagnetic-heat and electromagnetic-heat-fluid two-way coupling of the 3D model to analysis the temperature field distribution at such three cases as no addition of explosion-proof box,addition of of explosion-proof box with sealant as the filler and addition of explosion-proof box without filler.Then,the influence on the peak temperature before and after the addition of the explosion-proof box due to such three factors as air convection heat transfer coefficient,ambient temperature and the thermal conductivity of sealant.The research results show that the temperature of cable joint is increased at two cases after addition of the explosion-proof box for the joint and,in case of no filler in the explosion-proof box,the temperature of the joint is more variable.With the increase of the heat transfer coefficient,the peak temperature difference of the joints before and after adding the explosion-proof box increases gradually.While,the influence of ambient temperature on the variation amplitude of peak temperature can be ignored before and after adding the explosion-proof box.The increase of thermal conductivity of sealant to a certain extent is conductive to the increase of the cable joint current carrying capacity.

关 键 词：电缆接头 防火防爆盒 温度场仿真 影响因素 

分 类 号：TM247[一般工业技术—材料科学与工程]