并联电缆负载容量利用率分析  

Analysis of load capacity utilization for parallel cables

作　　者：罗楚军 冯玉雷 李健 廖星 邹睿 张哲[2] LUO Chujun;FENG Yulei;LI Jian;LIAO Xing;ZOU Rui;ZHANG Zhe(Central Southern China Electric Power Design Institute of China Power Engineering Consulting Group,Wuhan 430071,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [2]华中科技大学强磁场工程与新技术国家重点实验室,湖北武汉430074

出　　处：《电力科学与技术学报》2021年第1期127-136,共10页Journal of Electric Power Science And Technology

基　　金：国家重点研发计划(2016YFB0900600)。

摘　　要：将现有电缆与新增电缆并联运行,可充分利用已有电缆的输电容量,是实现低成本扩容的有效方法。但由于并联电缆回路之间耦合影响的差异,可能导致负荷电流在并联电缆间出现不均匀分配,进而降低负载容量利用率。在此背景下,该文从电缆芯线与金属护套构成的多回路电磁耦合基本方程出发,提出一种并联电缆负荷分流的计算方法;并以此为基础,对不同布置形式和相序排列方式下的并联电缆负载容量利用率进行分析,给出并联电缆相序优化排列的应用建议;最后通过数字仿真,验证分析结论的正确性。研究表明,通过合理的相序排列,可有效提升并联电缆负载容量利用率,更好地发挥其输电能力。Paralleling existing cables with new is an effective way to attain the low-cost capacity expansion,which can make a full utilization of existing cable's transmission capacity.However,due to the difference in coupling effects among parallel cables,the load current may be unevenly distributed to reduce the load capacity utilization.On the background,a load distribution calculation method of parallel cables is proposed in view of the the basic equations of multi-loop electromagnetic coupling between cable conductors and metal sheaths.Then the load capacity utilization of parallel cables with different layouts and phase sequence arrangements are analyzed,and application suggestions of phase sequence optimization of parallel cables are given.At last,the analysis conclusion is verified by a numerical simulation.The results show that the optimized phase sequence arrangements can improve the load capacity utilization of parallel cables effectively and take full advantages of the transmission capacity of cables.

关 键 词：并联电缆 负载容量利用率 电流分配 相序排列 接地方式 

分 类 号：TM726.4[电气工程—电力系统及自动化]