[关键词]
[摘要]
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,威胁周边设备及人员安全。当两处屏蔽门绝缘薄弱时,将形成杂散电流的泄 漏回路,加剧回流安全参数的异常升高,且屏蔽门绝缘阻值越低,线路钢轨电位幅值越低,但杂散电流水平越高。 此外,多个屏蔽门绝缘薄弱时,线路回流安全参数将急剧增加,对周边设备以及乘客、工作人员的安全造成严重 威胁。
[Key word]
[Abstract]
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.
[中图分类号]
U231
[基金项目]
国家自然科学基金项目(52007128)