110kV电缆中间接头载流能力计算与实验分析

发布时间：2018-01-27 02:50

本文关键词： 中间接头 kV电缆线路载流能力热路法温升实验轴切面几何模型　出处：《高电压技术》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:In order to evaluate the current carrying capacity of 110kV voltage grade cable intermediate joints, the radial heat conduction difference between the intermediate joints and the cable body was analyzed by using the hot path method. Based on the theoretical analysis, the geometric model of the 1/2 axis section of the finite-length intermediate joint is established, and the finite element simulation tool is used. The load flow rate of the intermediate joint is calculated iteratively. The temperature rise experiment of high current is carried out by simulating the air laying environment. The results show that the radial temperature difference of the intermediate joint is larger than the radial temperature difference of the cable body, and the radial thermal resistance of the intermediate joint is larger than that of the cable body. The influence range of axial heat transfer of the intermediate joint is small, and the temperature distribution of the conductor of the cable body near the intermediate joint is uniform. As the load increases, the conductor temperature difference between the intermediate joint and the cable body increases. Under the condition of air laying, the carrier current of 110kV cable line with intermediate connection is reduced by 145A; The conductor temperature of the intermediate joint is simulated by using the finite axial tangent geometry model. The calculated relative error is less than 6. The research results can be used as a reference for power dispatching and operation maintenance departments to consider the limiting effect of cable intermediate connection on the current carrying capacity of 110 kV cable lines.
【作者单位】：华南理工大学电力学院;广州供电局有限公司输电管理所;广东省电机工程学会电缆专委会;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM75
【正文快照】： 0引言1中间接头是电缆线路必备附件之一,其性能好坏关系到电缆线路的安全稳定运行[1-3]。温度是反映电缆中间接头运行状况的重要参数。过热运行不仅会加速交联聚乙烯(XLPE)绝缘老化,缩短接头使用寿命,而且会降低硅橡胶应力锥电气性能,导致接头内部电场分布集中,增大接头电击

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