城市轨道交通直流接触网残压形成原因探究

Research on the Causes of Residual Voltage of Urban Rail Transit DC Catenary

城市轨道交通直流接触网停电后存在残压,残压高于验电器门槛值时会影响验电判别和接地操作,延误接触网检修作业。在不同天气状况下,对正线接触网和车辆段接触网做残压放电试验,测算出接触网分布参数等效值,找出了直流接触网残压形成的原因,为降低残压影响提供依据。

There is residual voltage in the DC catenary of urban rail transit after power failure.When the residual voltage is higher than the threshold value of the electroscope,it will affect the power inspection and grounding operation,and delay the maintenance of the catenary.Under different weather conditions,the residual voltage discharge test was carried out on the main line catenary and the depot catenary,and the equivalent value of the catenary distribution parameters was calculated.The causes of residual voltage formation of DC contact network were found out,and the basis for reducing the impact of residual voltage was provided.