Analysis of Signal Leakage of Audio Frequency Track Circuit for High-Speed Rail

• Main Authors: Jia-Lun Hsu, 許家綸
• Other Authors: Shi-Lin Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/52206397064649999142

碩士 === 中原大學 === 電機工程研究所 === 100 === The audio frequency(600Hz) signal is transmitted by the signalling system on the high speed track circuit, which can specify whether the track circuit being occupied. If any, the next train can not enter the occupied track circuit(about one kilometer) to prevent from the head-on collision. When the rail fastening assembly(RFA) is polluted badly or is covered with heavy rain, the audio frequency signal may leak out of the RFA as to the signalling system making the incorrect judgement that the track circuit were occupied. This thesis intends to simulate the leakage of audio frequency signal from the RFA and analyze the leakage route and the audio frequency voltage and current on the track circuit with comparison to the measurement results. Two models are built in this study. The first model is used for simulating the signal voltage and current in whole track circuit; the second model for simulating the potential distribution and the leakage current of one RFA. We also design the data exchange interface between the two models. Then the track circuit model uses the RFA model results to analyze the leakage resistance, based on which to evaluate the whole track circuit voltage and leakage current. The developed models to analyze the audio frequency signal’s leakage of high speed track circuit, can be an important evaluation tool to prevent the leakage of audio frequency signal from the track circuit.