不同种类中压电缆中间接头的电-热场仿真分析  

Electrical-Thermal Field Simulation Analysis of Different Types of Intermediate Joints in Medium Voltage Cables

作　　者：王涛 肖驰 洪福 高嫄 江丽 辛昂倍 蔡英明 王强 WANG Tao;XIAO Chi;HONG Fu;GAO Yuan;JIANG Li;XIN Angbei;CAI Yingming;WANG Qiang(State Grid Shandong Electric Power Company Weihai Power Supply Company,Weihai 264200,China;College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网山东省电力公司威海供电公司,山东威海264200 [2]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《电工技术》2023年第17期198-203,共6页Electric Engineering

基　　金：国网山东省电力公司科技项目(编号2022A-085)。

摘　　要：为了对比研究冷缩式中间接头、模塑熔接中间接头(Mold Melt Joint,MMJ)和自熔式中间接头绝缘界面处电场分布以及径向温度分布,采用COMSOL Multiphysics仿真软件分别建立三种接头的三维仿真模型,对电场和温度场进行计算分析。结果表明:三种电缆中间接头电场强度最大处均为交联聚乙烯(Crosslinked Polyethylene,XLPE)绝缘内侧,冷缩式中间接头绝缘界面处产生空间电荷积聚,电场发生严重畸变;MMJ中间接头的绝缘部分采用与原电缆绝缘相同的XLPE材料,得益于“一体化”的绝缘结构,复合界面处的电场分布均匀;自熔式中间接头电场强度略有降低,表明自熔式中间接头具有良好的电气稳定性。三种电缆中间接头径向温度呈对称分布,且由内部热源向外部环境降低,符合热传导规律,其中自熔式中间接头散热效果最好,界面处温度较低,电气可靠性较高。In order to comparatively study the electric field distribution and radial temperature distribution at the insulation interface of three different types of intermediate joints used in medium voltage cables,i.e.,cold shrinkage intermediate joints,mold melt joints and self-melting intermediate joints,three-dimensional simulation models of the three kinds of joints were established by COMSOL Multiphysics simulation software,and the electric field and temperature field were calculated and analyzed.The results show that,with respect to all the three kinds of cable intermediate joints,the maximum electric field strength locates at the inner side of crosslinked polyethylene insulation.There occurs space charge accumulation at the insulation interface of cold shrinkage intermediate joints,and the electric field is seriously distorted.The insulation part of MMJ intermediate joints is made of the same XLPE material as the original cable insulation.So thanks to the"integrated"insulation structure,the electric field distribution at the composite interface of MMJ joints is uniform.The electric field strength of the self-melting intermediate joints decreases slightly,indicating a good electrical stability.In the three kinds of cables,the radial temperature of the intermediate joint is symmetrically distributed,and decreases from the internal heat source to the external environment,which accords with the law of heat conduction,among which the self-melting intermediate joint has the best heat dissipation effect,lower temperature at the interface and higher electrical reliability.

关 键 词：冷缩式接头 MMJ接头 自熔式接头 电场分布 温度场分布 

分 类 号：TM247[一般工业技术—材料科学与工程]