城市轨道交通排流柜对钢轨电位和杂散电流的影响机制研究  

Research on the influence mechanism of urban rail transit discharge cabinet on rail potential and stray current

作　　者：李宇杰[1] 赵小皓[1] 叶利宾 李乾 孟翀昊 LI Yujie;ZHAO Xiaohao;YE Libin;LI Gan;MENG Chonghao(Beijing Metro Operation Co.,Ltd.,Beijing 100044,China)

机构地区：[1]北京市地铁运营有限公司,北京100044

出　　处：《现代城市轨道交通》2025年第4期71-77,共7页Modern Urban Transit

摘　　要：城市轨道交通在直流牵引供电过程中,普遍存在杂散电流泄漏现象,该问题的存在严重影响回流系统的安全运行。排流柜作为一种排流防护手段,其投入使用后对钢轨电位和杂散电流分布的影响较为复杂,但目前针对该问题的分析尚显不足。为对该问题进行深入研究,首先,对排流柜工作原理进行阐述;其次,在排流柜等效模型的基础上构建回流系统多车多区间模型;最后,结合实际线路数据,针对不同的排流柜设置方案进行仿真分析。仿真结果表明,当排流柜在全线牵引所均引入使用时,能使更多杂散电流沿排流支路回流,但会导致钢轨电位抬升,排流网收集的杂散电流增大。针对此现象,进一步仿真发现,通过调节排流柜限流电阻能够减小对钢轨电位和杂散电流的不良影响,为后续治理杂散电流泄漏提供理论依据。In the DC traction power supply process of urban rail transit,there is a general phenomenon of stray current leakage,the existence of this issue seriously affects the safe operation of the return current system.As a means of discharge protection,the influence of discharge cabinet on the rail potential and stray current distribution after its introduction is relevantly complex,and the current analysis of the issue is still insufficient.To carry out an in-depth research of this issue,the working principle of the discharge cabinet is elaborated in the first place;secondly,a multivehicle and multi-section model of the return current system is constructed on the basis of the equivalent model of the discharge cabinet;last but not least,simulation analysis is carried out on different discharge cabinet setting schemes by combining with the actual line data.The simulation results show that when the discharge cabinet is introduced and used in all traction substations,it can make more stray current to flow back along the draining branch,but it will lead to the elevation of rail potential and the increase of stray currents collected by the discharge network.Targeting at this phenomenon,further simulation found that adjustment of the current limiting resistance of the discharge cabinet could reduce the adverse effect on the rail potential and stray current,providing theoretical basis for the subsequent management of stray current leakage.

关 键 词：城市轨道交通 回流系统模型 排流柜 钢轨电位 杂散电流 

分 类 号：U231.8[交通运输工程—道路与铁道工程]