回路间距对电力电缆短路电动力的影响分析  

Influence of phase sequence and loop spacing on short circuit electromagnetic force of power cable

作　　者：吕安强[1,2] 魏伦 李婷[1] 于晓霜 LYU Anqiang;WEI Lun;LI Ting;YU Xiaoshuang(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;North China Electric Power University(Hebei Key Laboratory of Power Internet of Things Technology),Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]华北电力大学(电力物联网技术河北省重点实验室),河北保定071003

出　　处：《电力工程技术》2023年第6期206-213,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52177141)。

摘　　要：为有效降低短路电动力对电缆和金具的损害,科学合理地确定电缆的回路间距,文中采用电磁耦合有限元法对高压大截面电缆短路电动力进行数值计算和分析。文中建立单、双回路下水平敷设和品型敷设的电缆三相短路电磁耦合有限元模型,计算并分析了短路电动力在时间和空间上的变化;分析得到了双回路水平和品型敷设下三相短路电动力最大值随回路间距变化的方程。结果表明,双回路短路电动力与回路间距满足特定函数关系,且存在一个电动力变化斜率的拐点,可根据该拐点确定回路间距。文中研究可为电缆短路电动力理论研究和工程设计施工提供理论和技术支撑。In order to effectively reduce the damage of short-circuit electromagnetic force to cables and cleats,and scientifically and reasonably determine the loop spacing of cables,this paper adopts electromagnetic coupling finite element method to calculate and analyze the short-circuit electromagnetic force of high-voltage large-section cables.The finite element model of three-phase short-circuit electromagnetic coupling for single-loop and double-loop cables in flat formation and trefoil formation is established,and the changes of short-circuit electromagnetic force in time and space are calculated and analyzed.The equation that the maximum value of three-phase short-circuit electromagnetic force varies with the distance between two circuits is obtained.The results show that the short-circuit electromagnetic force of double-loop cables satisfies a specific functional relationship with the loop spacing,and there is an inflection point of the change slope of electromagnetic force,which can be used to determine the loop spacing.This study can provide theoretical and technical support for the theoretical research of cable short-circuit electromagnetic force and engineering design or construction.

关 键 词：电力电缆 短路电动力 回路间距 电缆敷设 短路电流 有限元法 

分 类 号：TM757[电气工程—电力系统及自动化]