AUTHORS: Feng Chang, Wenzhen Kuang, Ruicheng Zhao

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ABSTRACT: 25Hz phase-sensitive track circuit has become the first selection of coded track circuit in railway station. The transmission characteristics of 25Hz phase-sensitive track circuit in broken state for analysis under the premise of considering the choke transformer. Take into account the impact of the choke transformer and adjacent track sections fully, and join the equivalent input impedance between the midpoint of the starting and the end of the rail line and the earth. Then the four terminal network model of the track circuit in broken state is established. And application of the distributed parameter method to solve the four terminal network coefficient of track circuit in the condition of broken state. Then, the transmission characteristics of the track circuit in broken state is carried out simulation analysis by using MATLAB simulation software. The simulation results show that broken rail state of track circuit power supply terminal voltage and current with position of broken rail, rail surface conductance and ballast resistance are related closely. Finally, according to the results of simulation analysis, the method of improving the sensitivity of the track circuit in broken state is proposed. The specific measures include: reducing the length of track circuit properly, increasing ballast resistance, increasing the rail surface conductance coefficient.

KEYWORDS: Phase-sensitive track circuit, Transmission characteristic, Distribution parameter, Broken rail state

REFERENCES:

[1] S.H. Zhu, Comparison of UM-71 and ZPW2000A track circuit, Railway Signalling & Communication, Vol.44, No.7, 2008, pp. 17- 18.

[2] J. X. Xu et. al., ZPW2000A Joint-less Track Circuit System Modeling and Simulation Considering Adjacent Signal Interference, in Proceeding of the 32nd Chinese Control Conference, 2013, pp. 8780-8787.

[3] S. Shooman, Broken Rail Detection Without Track Circuits, in Proceeding of the Joint University of Illinois/AAR/FRA Workshop on Rail Defect Detection and Removal Policies and Broken Rail Detection Technologies, 1997.

[4] G. Zumpano et. al., A new damage detection technique based on wave propagation for rails, International Journal of Solids and Structures, Vol. 43, No. 5, 2006, pp. 1023-1046.

[5] T. Devin et. al., Diffuse ultrasonic backscatter measurements for monitoring stress in rail, The Journal of the Acoustical Society of America, Vol. 132, No. 3, 2012, pp. 1961-1961.

[6] L. Oukhellou et. al., Dedicated sensor and classifier of rail head defects, Control Engineering Practice, Vol. 7, No. 1, 1999, pp. 57-61.

[7] A. D. Kersey et. al., High-resolution fibregrating based strain sensor with interferometric wavelength-shift detection, Electronics Letters, Vol. 28, No. 3, 1992, pp. 236-238.

[8] X. Dai et. al., The Condition Monitoring Based on Fiber Bragg Grating of Continuously Welded Line Track at Subway Viaduct Section of a Certain City, in Proceeding of the Fifth International Conference on Intelligent Systems Design and Engineering Applications, 2014, pp. 1010-1013.

[9] L. H. Peter, Alternating-current track circuiting, Journal of the Institution of Electrical Engineers, Vol. 58, No. 292, 1920, pp. 491- 506.

[10] P. Y. Liu, On the Simulation of the Characteristics of Electric Track Circuit, Urban Mass Transit, Vol. 15, No. 12, 2011, pp. 23-28.

[11] N. Nikolov, Study on Centre-fed Boundless Track Circuits, IEE Proceedings-Electric Power Applications, Vol. 152, No. 5, 2005, pp. 1049-1054.

[12] M. X. Tian, Analysis on the broken rail mode of a track circuit of center-fed double-side current-received type, China railway science, Vol. 31, No. 6, 2010, pp. 103-108.

[13] A. Mariscotti, Modeling of audio frequency track circuits for validation, tuning, and conducted interference prediction, IEEE Transactions on Intelligent Transportation Systems, Vol. 11, No. 1, 2010, pp. 52-60.

[14] A. Hernandez, FPGA-Based Track Circuit for Railways Using Transmission Encoding, IEEE Transactions on Intelligent Transportation Systems, Vol. 13, No. 2, 2012, pp. 437-448.

[15] G. Z. Mao, The modeling and simulation of track circuit, Electric Drive for Locomotives, Vol. 12, No. 1, 2004, pp. 41-46.

[16] M. G. Cao, Research of modeling and test on impedance bond in the high speed railway, PhD. Thesis, Beijing Jiaotong University, 2014.

[17] Z. G. Wang et. al., Test and adjustment of 25Hz phase sensitive track circuit, Railway signalling & communication, Vol. 40, No. 3, 2004, pp. 28-30.

[18] H. John et. al., Rail track distributed transmission line impedance and admittance: theoretical modeling and experimental results, IEEE Transactions on Vehicular Technology, Vol. 42, No. 2, 1993, pp. 225-241.

[19] X. l. Du, Calculation of the Impedance of a Rail Track with Earth Return for the HighSpeed Railway Signal Circuit Using FiniteElement Method, IEEE Transactions on Magnetics, Vol. 51, No. 3, 2015, pp. 1-4.

[20] X. J. Yuan, Testing and adjustment of 97 type 25Hz phase sensitive track circuit (three), Railway signalling & communication, Vol. 43, No. 2, 2007, pp. 23-25.

[21] B. Moler et. al., Numerical computing with MATLAB, Beihang university press, Chap.2, 2013.