城市轨道交通高架站雷击时磁场空间分布模拟

雷击建筑物引起的电磁干扰问题是建筑物雷电防护的重要研究课题。利用有限元法（FEM）模拟得到轨道交通高架站遭雷击时磁场空间分布并分析了其特征。给出了在IES电磁仿真软件中利用有限元法进行磁场数值模拟的方法，以北京市房山地铁线长阳高架站为例，通过建立模型、设定材料、施加激励源、网格剖分、后期处理等步骤，定量得到雷击时该高架站内的磁场分布数值，作出了磁场空间分布图，分析了所得磁场特征，确定了雷击磁场干扰的强度和范围，提出了对应的防护方法和措施。计算了采取屏蔽措施后的高架站磁场衰减及设备到引下线的安全距离。

Spatial Distribution Simulation of Magnetic Field around Urban Elevated Subway Station When Struck by Lightning

The problems of electromagnetic interference caused by lightning strikes are important research topics in the building lightning protection area. The spatial distribution of the magnetic field around elevated subway station is simulated using the finite element method (FEM) when struck by lightning. The method of magnetic field numerical simulation by use of FEM in the IES electromagnetic simulation software is introduced, and taking the Changyang elevated subway station in Fangshan as an example, the distribution of the magnetic field is obtained through the following process: model building, material setting, excitation source applying, mesh generation, post processing, etc. Then the spatial distribution of the magnetic field is presented in figures, and the features of the magnetic field are analyzed. The intensity and scope of lightning magnetic interference are determined, and the corresponding protection methods and measures are proposed. Finally, the attenuation of the magnetic field and the safe distance from the equipment to the down conductor are calculated after the shielding measures being taken in the elevated station.