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轨道电路是高速铁路系统中的重要设备,为研究雷电过电压对轨道电路的影响,基于ATP-EMTP软件建立了轨道电路及牵引供电多导体系统(MTLs)的联合模型,并对其雷电流作用下的冲击响应进行了仿真计算,针对钢轨为非均匀横截面导体,采用电磁场有限元法对钢轨等效半径进行了计算。计算结果表明:当接触网支柱遭受雷击时,贯通地线和架空地线承担了大部分雷电流;轨道电路室内设备产生了较大的雷电过电压,且距雷击点位置越远雷电过电压越小,同时,室外环境对轨道电路雷电过电压产生的影响不能忽略;在真实电缆与模拟网络接口处增设SPD对抑制雷电流起了很好的作用。
The track circuit is an important equipment in high-speed railway system. To study the influence of lightning overvoltage on the track circuit, a joint model of track circuit and traction power supply multi-conductor system (MTLs) is established based on ATP-EMTP software. The impact response of the steel is simulated. According to the finite element method of electromagnetic field, the equivalent radius of the rail is calculated for the rail with non-uniform cross-section. The calculation results show that most of the lightning current flows through the grounding wire and the overhead grounding wire when the strut of the contact net is struck by lightning. The lightning protection device generates a large lightning overvoltage in the indoor circuit of the track circuit, and the lightningnt overvoltage Small, at the same time, the impact of outdoor environment on the lightning over-voltage of the track circuit can not be neglected; the addition of SPD at the interface of the real cable and the analogue network plays a very good role in suppressing the lightning current.