地铁杂散电流分布规律及源控制措施研究

Study on Distribution Law of Stray Current and Source Control Measures in Subway

为了从源头上控制杂散电流,基于实际工程构建地铁单边供电方式下杂散电流分布模型,结合基尔霍夫定律、微分方程等对杂散电流表达式进行推导。借助MATLAB软件对求得的杂散电流表达式进行模拟研究,分析牵引电流、地铁运行区间、轨道纵向电阻、过渡电阻等因素对杂散电流分布规律的影响。研究结果表明:牵引电流、运行区间、轨道纵向电阻、过渡电阻不同时,杂散电流有较明显的变化。采取适当措施可降低杂散电流,减小其腐蚀燃气管道的风险。

In order to control the stray current from the source,the stray current distribution model under the unilateral power supply mode of subway is constructed based on the actual project,and the expression of stray current is derived combined with the Kirchhoffs law and differential equation.With the help of MATLAB software,the obtained stray current expression is simulated and studied,and the effects of traction current,subway running interval,track longitudinal resistance,transition resistance and other factors on the distribution law of stray current are analyzed.The results show that the stray current has obvious changes when traction current,running interval,track longitudinal resistance and transition resistance are different.Appropriate measures can be taken to reduce the stray current and its risk of corroding gas pipelines.