The compensation capacitors fault detection method of jointless track circuit based on DBWT and WR

Zhao, Lian; Zhankui, Li; Liu, Weining

doi:10.1109/icicisys.2009.5358243

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…It affects the short-circuit current at the sampling point between the faulty capacitor and the receiver [21], and the deviation in CFSST is influenced accordingly. A deviation in CFSST in one track section is out of the permissive range, and the on-site measurement has shown that there is one faulty compensation capacitor in the track circuit.…”

Section: Discussionmentioning

confidence: 99%

Study of the Track–Train Continuous Information Transmission Process in a High-Speed Railway

Zhao

Cai

et al. 2014

IEEE Trans. Intell. Transport. Syst.

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In the experiments and practical applications in a high-speed railway, it is observed that the carrier frequency of the sampled signal in a track circuit reader (TCR) is changed with train speed and goes beyond the upper permissive range prescribed for a jointless track circuit (JTC) in some cases. This can directly affect the availability of train target speed in train control systems and thus has an effect on the generation of the distance-to-go profile. It not only reduces the safety and efficiency of train traveling but also limits the improvement of train speed. To find the primary cause of the deviation in carrier frequency of the sampled signal in TCR (CFSST), this paper models the track-to-train continuous information transmission process using the transmission line theory based on the structures and principles of JTC and TCR. Then, the relation between the deviation in CFSST and the train speed is derived. Experimental results in high-speed railway have verified the correctness of the analysis, and the study can provides a strong theoretical basis for improving the safety level of railway traffic. Moreover, it can be a good reference for other countries where the similar track circuits are applied. Index Terms-High-speed railway, jointless track circuit (JTC), track circuit reader (TCR), track-train continuous information transmission (TTCIT), traffic control, transmission line theory.

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Section: Discussionmentioning

confidence: 99%

Study of the Track–Train Continuous Information Transmission Process in a High-Speed Railway

Zhao

Cai

et al. 2014

IEEE Trans. Intell. Transport. Syst.

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“…Zhao et al [10] designed a kind of onboard autotest system to detect the faults of track circuit's compensating capacitors in real time. Zhao et al [11] used the induced voltage recorded by cab signal as fault feature and gave a fault diagnosis method for track circuit based on discrete binary wavelet transform (DBWT) and wavelet ridge (WR), finally detecting the changes of instantaneous frequency to diagnose the disconnection fault of compensating capacitor. Zhao et al [12] used the transmission line theory to construct a track circuit model with cascade form of multiple four terminal networks.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao and Mu [14] analyzed induced voltage envelope of cab signal (IVECS) of track circuit by simulation model under different faulty conditions and proposed a compensating capacitor diagnosis method based on adaptive optimal kernel time-frequency representation (AOK-TFR). Zhao et al [15] adopted B-spline DBWT and improved Hilbert-Huang transformation for noise reduction and fault feature retrieve and proposed a diagnosis method for compensating capacitor based on cab signal recorder information. Zhao et al [16] proposed a diagnosis method for compensating capacitor based on the regression model of the shunt current.…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis for Compensating Capacitors of Jointless Track Circuit Based on Dynamic Time Warping

Dong

2014

Mathematical Problems in Engineering

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Aiming at the problem of online fault diagnosis for compensating capacitors of jointless track circuit, a dynamic time warping (DTW) based diagnosis method is proposed in this paper. Different from the existing related works, this method only uses the ground indoor monitoring signals of track circuit to locate the faulty compensating capacitor, not depending on the shunt current of inspection train, which is an indispensable condition for existing methods. So, it can be used for online diagnosis of compensating capacitor, which has not yet been realized by existing methods. To overcome the key problem that track circuit cannot obtain the precise position of the train, the DTW method is used for the first time in this situation to recover the function relationship between receiver's peak voltage and shunt position. The necessity, thinking, and procedure of the method are described in detail. Besides the classical DTW based method, two improved methods for improving classification quality and reducing computation complexity are proposed. Finally, the diagnosis experiments based on the simulation model of track circuit show the effectiveness of the proposed methods.

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“…In order to reduce maintenance costs and provide a high level of reliability and safety, a great deal of research effort has been directed towards fault detection and diagnosis for trimming capacitors in recent years. One important direction is through analysing the so called short-circuit current signal, and excellent progress has been made using the Dempster-Shafer theory (Oukhellou et al [3]), discrete binary wavelet transform (Zhao et al [4]), partial least squares regression and neural network (Debiolles et al [5]). But most of these methods are only able to detect the first one defective trimming capacitor.…”

Section: Introductionmentioning

confidence: 99%

A fault diagnosis approach for railway track circuits trimming capacitors using EMD and Teager Energy Operator

Sun¹,

Zhao²,

Zhou³

2012

WIT Transactions on the Built Environment

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The trimming capacitor is an important component of a track circuit used for train detection in the railway train control system. In order to ensure the required dependability and availability levels, their working conditions shall be monitored in a timely and efficient manner. This paper presents a diagnosis approach of trimming capacitors based on Empirical Mode Decomposition (EMD) and Teager Energy Operator (TEO) theory. The EMD is used to decompose the short-circuit current signal into two parts. One is the sum of a set of Intrinsic Mode Functions (IMFs), which feature the fault information of the defective trimming capacitors; the other is the residual element relating to the signal variation trend. Then the TEO of IMFs is performed and the instantaneous frequencies are derived, so as to highlight the fault features. Experiments with simulated data show that multiple defects can be detected effectively using this approach. Compared with the existing methods which are only able to detect one failed capacitor, the integrated method represents a rather improved performance.

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The compensation capacitors fault detection method of jointless track circuit based on DBWT and WR

Cited by 7 publications

References 3 publications

Study of the Track–Train Continuous Information Transmission Process in a High-Speed Railway

Study of the Track–Train Continuous Information Transmission Process in a High-Speed Railway

Fault Diagnosis for Compensating Capacitors of Jointless Track Circuit Based on Dynamic Time Warping

A fault diagnosis approach for railway track circuits trimming capacitors using EMD and Teager Energy Operator

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