基于电磁场模型的轨道电路钢轨阻抗研究

Study on track circuit impedance based on electromagnetic field model

轨道电路能够传递列车行车许可、检查轨道占用,有效地保证了列车安全高效的运行。轨道电路的钢轨阻抗决定了轨道电路的传输性能,研究钢轨阻抗变化具有重要意义。本文提出一种基于电磁场模型的钢轨阻抗研究方法。首先分析轨道电路中钢轨阻抗的分布原理,确定钢轨阻抗的计算方法;然后建立模型,计算比较有砟轨道和无砟轨道钢轨阻抗在不同环境和频率下的变化;最后仿真验证无砟轨道钢轨阻抗优化方法的正确性。结果表明电磁场模型可以很好的模拟轨道电路,分析不同环境下钢轨阻抗的变化规律,验证了加高距离和绝缘方法对于优化无砟轨道钢轨阻抗的正确性。

Track circuit could be used to transmit train movement authority（MA） and check the track occupancy,and it could effectively ensure the safety and efficiency of the train.The impedance of track circuit determined the transmission performance,so it was very meaningful to study on impedance of track circuit.This paper proposed the study method for track circuit based on electromagnetic field model.First,the calculation of the rail impedance was determined.Secondly,the mode was established,the rail impedance was calculated in different environments and frequency.Finally,the correctness of the optimization non-ballasted track rail was certificated.The electromagnetic model of track circuit was proved to be a commendable simulation model of track circuit and the variation of the rail impedance in different environments was simulated.The correctness of the optimization non-ballasted track rail by heightening the distance or imposing insulation measures was certificated.