地铁隧道内电磁场分布特性分析

摘要

准确掌握地铁隧道内电磁场的分布状况是建立直流牵引供电系统电磁暂态模型的基础,也是开发直流牵引供电系统馈线保护方法的需要.针对地铁隧道内非对称的空间结构,利用有限元分析法计算了不同工况下地铁隧道内的电磁场分布特性,确定了地铁隧道内电磁场与钢轨电位、钢轨电流间的定量关系,以及列车位置对电磁场分布的影响.分析结果符合电磁场分布理论表述的规律.%Accurately grasping the eleclric and magnetic field distribution in the subway tunnel is not only the foundation of establishing the electromagnetic transient model of the DC traction power supply system, but also the need to develop the feeder protection of the DC traction power supply system. Based on the asymmetric spatial structure of the subway tunnel, the characteristics of the electric and magnetic field distribution in the subway tunnel under different working conditions are calculated and analyzed by using the finite clement analysis. At the same time, the electric and magnetic field distribution in the subway tunnel and their quantitative relationships with rail potential, rail current and train position are determined. The analysis results are consistent with the law described by the electric and magnetic theory.