Abstract
Based on the operating principle of ZPW-2000 track circuit, the influence of the fault of the tuning area on the transmission characteristics of ZPW-2000 track circuit was analysed. Firstly, the four-terminal network model of the track circuit was established by using the transmission-line theory. Secondly, the transmission characteristic equation from the transmitting end to the receiving end was derived. Finally, the most unfavourable conditions were determined and the voltage at the receiving end of the track circuit and the frequency envelope of the circuit were simulated respectively. The results shew that the fault of the tuning area could have a great influence on the transmission characteristics of the track circuit. This mathematical model can provide a theoretical basis for the study of the fault protection capability of the track circuit to the tuning area.
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