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<p>To address the issue of poor contact between the lead wires of the ZPW-2000A track circuit tuning unit and the steel rails, a fault detection method for the tuning areaof the ZPW-2000A track circuit is proposed, based on the analysis of the receiver’ response under multi-source signal excitation during fault conditions. Initially, a transmission line model for the ZPW-2000A track circuit is established, and an enhanced nodal admittance time-domain equation is derived. The Laplace transform of the equation is subsequently applied to obtain the complex frequency-domain expression for the track circuit receiver voltage. Furthermore, a numerical time-domain solution is obtained by applying Fourier transform in conjunction with the Q-D algorithm. Finally, a simulation analysis is conducted to evaluate the receiver’ response under various signal source excitations, comparing the fault and normal conditions of the track circuit tuning section. The results indicate that, under Various Signal Sources excitation, the receiver’ response during a poor contact fault between the tuning unit and the steel rail is more readily distinguishable from other fault types. This approach provides a novel methodology for fault diagnosis in frequency-shifted track circuit tuning sections.</p>

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Failure Analysis of Poor Contact Between ZPW-2000 Track Circuit Tuning Unit Lead Wires and Rails Based on Various Signal Sources

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Jian-qiang Shi,
  • You-peng Zhang,
  • Bin Zhao,
  • Lei Chen,
  • Dong Wang,
  • Long Li,
  • Qi-qi Jiang

摘要

To address the issue of poor contact between the lead wires of the ZPW-2000A track circuit tuning unit and the steel rails, a fault detection method for the tuning areaof the ZPW-2000A track circuit is proposed, based on the analysis of the receiver’ response under multi-source signal excitation during fault conditions. Initially, a transmission line model for the ZPW-2000A track circuit is established, and an enhanced nodal admittance time-domain equation is derived. The Laplace transform of the equation is subsequently applied to obtain the complex frequency-domain expression for the track circuit receiver voltage. Furthermore, a numerical time-domain solution is obtained by applying Fourier transform in conjunction with the Q-D algorithm. Finally, a simulation analysis is conducted to evaluate the receiver’ response under various signal source excitations, comparing the fault and normal conditions of the track circuit tuning section. The results indicate that, under Various Signal Sources excitation, the receiver’ response during a poor contact fault between the tuning unit and the steel rail is more readily distinguishable from other fault types. This approach provides a novel methodology for fault diagnosis in frequency-shifted track circuit tuning sections.