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For enhancing the troubleshooting efficiency of a track circuit, a fault diagnosis method for the track circuit is proposed in this paper. First, a locomotive signal induced voltage model is established based on the transmission-line theory. Then, cases of the induced voltage envelope signals, when the track circuits are in the normal and fault conditions, respectively, are simulated. Next, a three-layer...
In order to reduce the voltage drop on the track between the sending end and the receiving end, the track are usually capacitively compensated with shunt capacitors in audiofrequency track circuits (TCs). The impact of track compensation on broken rail detection, which is a key feature of TCs to ensure operation safety, should be considered accordingly. In this paper, the model of track circuits with...
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...
Many changes were made to the Z machine oil and water sections in 2007 as part of the Z refurbishment project. As Z was returned to routine operation, some components required modification to increase shot rate. This paper summarizes the oil- and water-section insulator failures encountered in 2008 along with a description of the solutions implemented.
A part of the signaling systems related to a rapid transit railway is using the track circuit to detect trains and to deliver train operation services on carriage. Because the interval of one block for a rapid transit railway is as long as 1500 [m], transmission of signal information throughout a track circuit has some troubles. So a compensation capacitor should be installed every 20 [m]. Moreover,...
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