调谐区钢轨电气断离故障对轨道电路工作状态的影响研究

Study on Infl uence of Rail Electrical Isolation Fault in Tuning Section on Track Circuit Working State

调谐区是ZPW-2000A无绝缘轨道电路的重要组成部分,用于相邻区段的电气隔离和信号传输。调谐区钢轨电气断离故障后,往往难以判断故障点位置,增大了维修难度。本文基于ZPW-2000A轨道电路传输模型,对不同载频、不同位置处的调谐区内开路故障进行仿真计算,提出不同位置故障时发送端、接收端轨面电压和小轨电压的变化规律,可对现场故障的快速判断处理提供指导。

Tuning section is a key component of ZPW-2000A insulation-free track circuits.It is used for electrical isolation and signal transmission of adjacent sections.After failures in electrical isolation occur on the rails in the tuning section,fault locations are often hard to be identifi ed,which makes repair work signifi cantly more challenging.Based on ZPW-2000A track circuit transmission model,this article includes the simulation and relevant computation for open circuit faults occurred at various locations within the tuning section with various carrier frequencies.It also introduces the patterns of change in rail surface voltage and the voltage of short track circuits on both transmitting and receiving ends at various locations when fault occurs,which can be used as a guidance for fault identifying and handling on site.