地铁隧道内敷设高压电缆的工频磁场特性分析

分析地铁隧道内敷设的220 V高压电缆对地铁电力、通信与信号等设备的工频磁场影响。首先,采用有限元法建立地铁隧道内敷设的220 V高压电缆及隧道结构的二维仿真模型,分析电缆正常工作和发生故障运行时的磁场分布,以及对通信线路、直流牵引供电线路、钢轨等产生的感应电动势波形及影响;然后,提出相应的工频磁场削弱方法,并进行二维有限元仿真分析。结果表明,采用隧道电缆排列和屏蔽设计可有效地减少工频磁场对公共地铁隧道的干扰。为了验证分析结果的正确性,对实际隧道内220 V电缆的磁场进行了测量,测试结果与仿真结果一致。

Analysis of High-voltage Cable Power Frequency Magnetic Filed Performance in Subway Tunnel

The influence of magnetic field caused by 220kV high-voltage cable in subway tunnel over metro power,com-munications and signaling devices is analyzed. Firstly,a 2D simulation model of 220kV high-voltage cable and the tunnel structure is established by using finite element method (FEM), the magnetic field distributions under normal condition and fault condition,the influence of 220kV high-voltage cable on communication lines,on DC traction current supply system and subway track are analyzed. Secondly,corresponding meth-ods to weaken the power frequency magnetic field are pro-posed,a 2D finite element simulation analysis is conducted. All the results show that the power frequency magnetic field disturbances are obviously reduced by using cable array in tunnel and the shielding design methods. Lastly,to verify the correctness of the analytic results,a practical 220kV cable tun-nel is measured,the data obtained are consistent with that of the simulation.