基于传输线理论的列车分路阻抗研究

Research on Train Shunting Impedance Based on Transmission Line Theory

通常以列车第一轮对分路电阻为等效模型研究列车对轨道电路的分路过程,但此过程忽略了其他轮对的分路作用,无法研究“分路不良”等故障情况。尤其是对于无绝缘轨道电路,其钢轨线路中所跨接的补偿电容,将使列车分路过程更为复杂。针对这一问题,根据传输线理论,从各轮对分路电阻出发,在考虑道床漏泄的情况下,建立列车分路阻抗的六端网络模型,并利用机车信号工作原理,间接验证了模型的正确性,着重分析轮对分路电阻、补偿电容和钢轨线路参数对列车分路阻抗的影响规律。最后,基于计算列车轮对结构重要度,构建列车分路阻抗的简化模型,为进一步研究“分路不良”等故障情况提供理论支持。

The shunting process of train to track circuit is usually studied by taking the shunting resistance of the first wheel set of train as the equivalent model,which ignores the shunting effect of other wheel sets and cannot study the fault conditions such as“poor shunting”.Especially for the jointless track circuit,the compensation capacitors connected in parallel on the rail line will cause more complex train shunting process.To solve this problem,based on the transmission line theory,starting from the shunting resistance of each wheel set and considering the leakage of track bed,this paper established a six terminal network model of train shunting impedance,indirectly verified the correctness of the model by using the working principle of locomotive signal,and focused on the influence of wheel set shunting resistance,compensation capacitance and rail line parameters on the train shunting impedance.Finally,based on the calculation of the structure importance of train wheel set,a simplified model of train shunting impedance was constructed,providing theoretical support for the further study of fault conditions such as“poor shunting”.