双流制车辆段内交直流干扰对钢轨电位分布规律影响研究

Influence of AC/DC Interference on Rail Potential Distribution in Dual-current-type Railway Depots

交直流双流制牵引供电模式代表了城市轨道交通系统和市域铁路之间互联互通的发展方向,应用前景非常广阔。交直流双流制牵引供电模式中的车辆段具有双流制切换供电功能,所以车辆段内不仅股道分布密集,接触网距离较近,而且接触网会出现交、直流并行情况,从而导致车辆段内电气环境更加复杂。为保证车辆段库内检修作业安全,建立车辆段的车-网-地耦合模型,分析钢轨电位分布规律与影响因素,定量评估库内牵引回流的安全性。

Dual-current-type electric traction mode represents the development direction of interconnection between urban rail transit and trans-urban railroad,and has broad applicative prospect.The railway depots in dual-current-type electric traction systems need to realize the function of AC/DC power supply switching.This leads to,inside the depots,dense rails,closely located contact networks,and AC/DC hybridization of contact networks,and furthermore,more complex electrical environments.In order to facilitate safe maintenance of the railway depots,this work established the vehicle-network-ground coupling model of railway depot,analyzed the distribution law of the rail potential and the influencing factors,and quantitatively evaluates the safety of internal traction return current.