110kV电缆中间接头载流能力计算与实验分析  

Current Capacity Calculation and Experimental Analysis of 110 kV Cable Joint

作　　者：刘刚[1] 王振华[1] 徐涛 刘毅刚 王鹏宇[1] 

机构地区：[1]华南理工大学电力学院,广州510640 [2]广州供电局有限公司输电管理所,广州510310 [3]广东省电机工程学会电缆专委会,广州510310

出　　处：《高电压技术》2017年第5期1670-1676,共7页High Voltage Engineering

基　　金：国家高技术研究发展计划(863计划)(2015AA050201)~~

摘　　要：为了评估110 kV电压等级电缆中间接头的载流能力,采用热路法分析了中间接头与电缆本体的径向导热差异,及中间接头轴向传热的影响范围。基于理论分析,建立了有限长中间接头1/2轴切面几何模型,利用有限元仿真工具,迭代计算了中间接头载流量。模拟空气敷设环境,进行了大电流温升实验,得到了中间接头局部温度分布规律。研究结果表明:中间接头径向温差大于电缆本体径向温差,对应中间接头径向热阻大于电缆本体径向热阻;中间接头轴向传热影响范围小,靠近中间接头的电缆本体导体温度轴向分布均匀;随着负荷增大,中间接头与电缆本体的导体温差增大;空气敷设环境下,考虑中间接头的110 kV电缆线路载流量降低145 A;采用有限长轴切面几何模型仿真计算中间接头导体温度,计算相对误差小于6%。该研究结果可以为电力调度及运行维护部门考量电缆中间接头对110 kV电缆线路载流量的限制作用提供参考。To evaluate the current capacity of 110 kV cable joint, thermal-circuit method is used in analysis of radial conduction difference between cable and its matching joint, also the impact range of axial conduction. Based on theoreti- cal analysis, 1/2 axial plane geometry model with limited length is built, then current capacity of cable joint is obtained using iterative method in thermal simulation. High-current tempera^u＇e-rise experiment is done under air-laying environ- ment, and local temperature distribution law of cable joint is obtained. The results show： radial temperature difference of cable joint is higher relative to cable itself, accordingly, radial thermal resistance of cable joint is higher; the impact range of axial conduction is small, axial temperature distribution uniformity is observed in cable conductor close to cable joint; the temperature difference between cable and cable joint increase with the rise of current; under air-laying environment, ampacity of 110 kV cable line is reduced by 145 A in consideration of cable joint; the relative calculation error is less than 6%, when axial plane geometry model with limited length is used in thermal simulation of cable joint. The research re- sults obtained can be used as reference to assess the restriction of cable joint to current capacity of 110 kV cable line.

关 键 词：中间接头 110 k V电缆线路 载流能力 热路法 温升实验 轴切面几何模型 

分 类 号：TM75[电气工程—电力系统及自动化]