Abstract: As a commonly used standard for railway station track circuits, the safe and reliable operation of 25 Hz phase detecting track circuit is directly related to the safe and efficient operation of the railway network. However, poor shunting is still a typical technical problem in the application process of 25 Hz phase detecting track circuit. Based on a typical case of poor shunting in track circuit that occurred at a certain station,  this paper deeply introduces the coping strategies for the problem of poor shunting of a 25 Hz phase detecting track circuit, and designs a variety of optimization and adjustment schemes and carries out comparative analysis. Finally, taking into account the causes of poor shunting and the characteristics of the 25 Hz phase detecting track circuit, practical application suggestions for the solution are given, which provides a necessary reference for solving the problem of poor shunting of the 25 Hz phase detecting track circuit in the field.

Key words: loss of shunting, residual shunt voltage, 25 Hz phase detecting track circuit, combined adjustment, rail derusting

摘要： 25 Hz相敏轨道电路作为铁路站内轨道电路的常用制式，其安全可靠运行直接关系到铁路网络的安全高效运行。然而，当前分路不良仍是25 Hz相敏轨道电路应用过程中的典型技术难题。以某站发生的一起典型轨道电路分路不良案例为出发点，深入介绍25 Hz相敏轨道电路分路不良问题的应对策略，设计多种优化调整方案并开展对比分析。最后，综合考虑分路不良问题的诱因及25 Hz相敏轨道电路自身特性，给出方案的实际应用建议，为现场解决25 Hz相敏轨道电路分路不良问题提供必要参考。

关键词: 分路不良, 分路残压, 25?Hz相敏轨道电路, 组合调整, 钢轨除锈