基于实测牵引回流的地铁时变负荷对钢轨电位影响分析

Analysis of the Influence of Subway Time-varying Load on Rail Potential Based on Actual Measurement of Traction Return

在电气化铁路中列车轨道是牵引电流回流通道的一部分,钢轨对地电位容易对信号电缆芯线产生干扰。通过测试某地铁线路牵引电流回流与钢轨对地电位,验证基于CDEGS软件建立的直流牵引回流系统模型的正确性。以测试样本为依据,结合运行图信息,基于小波变换算法研究地铁时变负荷特性,建立地铁典型负荷模型,分析牵引负荷时变特性对钢轨电位的影响。对多列车不同运行工况下的钢轨电位分布进行计算和仿真,提出降低钢轨电位的方法。

In the electrified railway,the train track is a part of the traction current return channel,and the ground potential of the steel rail is likely to interfere with the signal cable core wire.By testing the traction current return of a subway line and the rail-to-ground potential,the correctness of the DC traction return system model based on CDEGS software is verified.Based on the test samples,combined with the information of the operation diagram,the time-varying load characteristics of the subway are studied based on the wavelet transform algorithm,and the typical load model of the subway is established.The influence of time-varying characteristics of traction load on rail potential is analyzed.The rail potential distribution of multiple trains under different operating conditions is calculated and simulated,and a method to reduce the rail potential is proposed.