不均匀过渡电阻下地铁杂散电流分析

Analysis of Stray Current under Nonuniform Transition Resistance in Subway

在地铁工程设计中,考虑钢轨对结构或对地的过渡电阻均匀会造成钢轨电位和杂散电流的泄露情况与设计不符。讨论杂散电流的产生、危害及其相关腐蚀机理,建立均匀电阻下直流供电系统杂散电流分布的数学模型;采用数学模型进行计算机仿真,对比分析不均匀过渡电阻下的杂散电流分布规律,对具体地铁工程钢轨电位和杂散电流引发的问题进行分析和研究。

In the design of subway projects,uniform transition resistance will cause the inconsistency between the design and rail potential as well as stray current.After the causes and hazards of stray current in DC traction power supply system as well as the mechanism of corrosion were analyzed,a mathmetical model was built for the distribution of stray current under uniform resistance in DC traction power supply system.Then the distribution principle of stray current under nonuniform transition resistance for comparison by computer simulation was elaborated,to help analyze problems caused by rail potential and stray current for a specific subway project.