城轨屏蔽门绝缘状态对回流安全参数的影响研究

城轨直流牵引供电系统回流安全问题逐渐成为目前的重点研究之一,然而与走行轨等电位连接的屏蔽门往往因绝缘不理想而对线路回流安全参数的分布造成影响.针对屏蔽门绝缘状态对城轨回流安全参数的影响,建立了多列车动态潮流仿真模型,并基于无锡地铁2号线的数据进行了仿真分析.结果表明,屏蔽门绝缘状态薄弱将导致线路回流安全参数明显增加,威...

Influence of the Insulation State of Shield Doors on the Reflux Safety Parameters in Urban Rail Transit

In recent years, the reflux safety of DC traction power supply systems in urban rail transit has gradually attracted research interest. Equipotential shield doors with running rails affect the distribution of reflux safety parameters due to inadequate insulation. In this study, to investigate the influence of the insulation status of the shield doors on the reflux safety parameters, a simulation model of multi-train dynamic power flow was established, and simulations were conducted based on the data of Wuxi Metro Line 2. The results demonstrated that a weak insulation status of the shield doors results in a significant increase in the reflux safety parameters, compromising the safety of the equipment and personnel. If the insulation of the two shield doors is weak, a leakage loop of stray current is formed, aggravating the abnormal increase in the reflux safety parameters. It was found that the lower the insulation resistance of the shield doors, the lower the amplitude of the rail potential and higher the stray current. In addition, when the insulation of multiple shield doors is weak, the reflux safety parameters increases sharply, posing a serious threat to the safety of equipment, passengers, and staff.