基于链式电路的城轨交流牵引供电系统钢轨电位研究  

Chain Circuit Model-based Rail Potential Analysis of AC Traction Power Supply System for Urban Rail Transit

作　　者：徐茵茹 官韵 蓝康铭 XU Yinru;GUAN Yun;LAN Kangming(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756

出　　处：《电工技术》2024年第20期167-170,174,共5页Electric Engineering

摘　　要：城轨交通交流3 kV牵引供电系统不仅能够解决直流制的杂散电流问题,同时也能解决工频单相交流制的循环换相问题。建立了交流牵引供电系统链式电路模型,通过潮流计算分析了钢轨电位影响因素。结果表明,缩短牵引变电所间距、减小轨地间过渡电阻、缩短上下行横连间距、增大回流线截面积均能减低钢轨电位。提出增设综合地线以及在隧道内横通道处进行上下行并联的措施,采取措施后钢轨电位最大值降低42.99%,钢轨电位得到有效降低。The urban rail transit AC 3 kV traction power supply system overcomes both problems of stray current in DC system and cyclic commutation in standard frequency single-phase AC system.In this work,the chain network circuit model of AC traction power supply system was established,and the influencing factors of rail potential were analyzed by power flow calculation.The results showed that any of the following changes would lead to reduced rail potential:reducing the distance between cross-links,shortening the distance between the traction substations,reducing the leakage impedance,and increasing the cross-sectional area of the return line.The measures of adding integrated ground wire and up-down parallel connection at the horizontal channel were put forward,whose practical execution brought about effective reduction in maximum rail potential by 42.99%.

关 键 词：钢轨电位 牵引供电 链式电路 城轨交通 

分 类 号：U223[交通运输工程—道路与铁道工程]