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Volume 54 Issue 6
Nov.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(6): 1332-1341.
YANG Shiwu, CHEN Bingjun, CHEN Haikang, CUI Yong, TANG Qiankun. Suppression Solutions to Transient Traction Current Interference in Neutral Zone for Track Circuit[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1332-1341. doi: 10.3969/j.issn.0258-2724.20180692
Citation: YANG Shiwu, CHEN Bingjun, CHEN Haikang, CUI Yong, TANG Qiankun. Suppression Solutions to Transient Traction Current Interference in Neutral Zone for Track Circuit[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1332-1341. doi: 10.3969/j.issn.0258-2724.20180692
shu

Suppression Solutions to Transient Traction Current Interference in Neutral Zone for Track Circuit

doi: 10.3969/j.issn.0258-2724.20180692
  • Received Date: 05 Sep 2018
  • Rev Recd Date: 04 Mar 2019
    • Available Online: 15 Mar 2019
  • Publish Date: 01 Dec 2019
    Abstract
  • When an electric locomotive or an EMU (electric multiple unit) passes neutral zone in a track section, transient traction current is very likely to cause harmonic interference to track circuit, which may produce failure. To guarantee stable performance of track circuit under the influence of harmonic interference, the suppression methods of transient traction current are studied. Based on the European standards, the windowed FFT (fast Fourier transformation) method is adopted to design the procedure of harmonic data processing, and the analysis results of field test data are utilized to illustrate the interference mechanism for track circuit. Then, taking an example with a 1 700 Hz signal carrier and 1 750 Hz harmonic frequency, the solution and simulation results of FPGA (field-programmable gate array)-based FIR (finite impulse response) digital filter are briefly discussed from the point of direct suppression to harmonic interference. Due to the tiny difference between signal frequency and interference harmonic, the solution has to run at the cost of long response time and high order. Lastly, based on the current source feature of harmonic interference and project feasibility, the collaborative optimization scheme for the transmitter and attenuator of track circuit is proposed. Namely, by optimizing the transmitting level and attenuator step, the suppression to harmonic inference can be improved with an increase of 6 dB in signal-to-interference ratio while the operation states of track circuit are ensured including its clearance, occupancy and cab signaling.

     

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