“一送两受”式无绝缘轨道电路最大传输距离分析

Study on the Maximum Transmission Distance of Centre-fed Boundless Track Circuits

为了求解中央供电两端接受式无绝缘轨道电路最大传输距离,本文根据此种轨道电路在调整态、分路态、断轨态3种工作状态下的四端网数学模型,在不同的初始参数下仿真分析了轨道电路在断轨态和分路态下的转移阻抗的变化情况,得出轨道电路在断轨态转移阻抗的最小值大于分路态转移阻抗的最小值,以此简化了求解轨道电路最大传输距离的前提条件。在此基础上,给出了求解此种轨道电路最大传输距离的计算方法。结果对比表明,该方法能够正确地计算轨道电路最大传输距离,为此类型轨道电路的设计提供理论依据。

In order to obtain the maximum tranmission distance of the center-fed boundless track circuits, the two-port network models designed for operation in normal, shunt and broken rail modes were used to simulate and analyze variation of transmission impedances in shunt and broken rail modes with different initial parame- ters. The minimum transmission impedance in broken operation was found to be larger than the minimum transmission impedance in shunt operation. The premise conditions were so simplified. On this basis the new algorithm to solve the maximum transmission distance of the center-fed boundless track circuit was presented. It shows that the proposed method is able to eompute the maximum transmission distance of the center-fed boundless track circuit correctly and to provide a convincing way for analysis on designing this kind of track cir- cuits.