The simulation analysis of influence on jointless track circuit signal transmission from compensation capacitor based on transmission-line theory

Based on working principle of ZPW TYPE-2000A jointless track circuit, this paper uses transmission-line theory in the circuit network to identify component elements of track circuit with cascade form of multiple four terminal networks. The model constructed is proved to be correct due to conformity relation between the induced voltage of locomotive and short circuit current of track circuit, based this correct model, the simulation analysis of track voltage in normal state, short circuit current in shunted state and input impedance of main track circuit in sending end is done under the typical fault mode of compensation capacitor. The analysis results have many meanings to fault analysis and diagnosis of track circuit and compensation capacitor in railway site.