Proceedings ArticleDOI
Modelling of the Return Traction Current Harmonics Distribution in Rails for AC Electric Railway System
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TLDR
An evolved model for distribution of the traction current harmonics in rails from several trains based on distance from electrical supply substation, the rail-to-earth conductance, and the number of trains in the feeder zone is considered.Abstract:
The problem of determination of the traction current harmonics distribution in rails generated by several trains that operated in AC feeder zone is considered. The investigations were caused by necessity to ensure electromagnetic compatibility of the new types of rolling stock equipped with electronic static converters with track circuits that are used in train movement control systems for detection of their positions. The great diversity of rolling stock, power supply and return current systems, and train detection systems installed in European countries leads to consideration of the electromagnetic compatibility problem taking into account the specific railway systems used in the each country. Investigation of the electromagnetic compatibility between different railway subsystems requires the use of simulation programs that help to reveal most critical conditions for electromagnetic compatibility at an early stage and also makes it possible to estimate electromagnetic interference from rolling stock in rails under the worst-case conditions, realization of which in the operating systems will require a lot of time and cost. This work consider evolved model for distribution of the traction current harmonics in rails from several trains. To illustrate the application of the considered model, the distribution of the traction current harmonics in rails was computed for25 kV AC direct feeding network depending on distance from electrical supply substation, the rail-to-earth conductance, and the number of trains in the feeder zone. The results of modeling of the harmonics distribution are in satisfactory agreement with the experimental data.read more
Citations
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Proceedings ArticleDOI
Modelling of the Distribution of Return Traction Current Harmonics in Electrically Asymmetric Rails
TL;DR: The distribution of return traction current harmonics in electrically asymmetric rails in AC feeder zone is considered to evaluate electromagnetic interference from rolling stock at an early stage and under the worst conditions for its safe operation.
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Wavelet Based Detection of Signal Disturbances in Cab Signalling System
TL;DR: An artificial neural network was used to classify ALSN signal disturbances, and the efficiency of the proposed algorithm was verified by processing of several specially simulated as well as real ALSN signals measured during tests.
Proceedings ArticleDOI
Audio Frequency Track Circuits Monitoring Based on Wavelet Transform and Artificial Neural Network Classifier
TL;DR: The processing of the track circuits signals in accordance with the proposed method show high effectiveness in the revealing and identification of the signal disturbances.
Journal ArticleDOI
Reducing noise influence on an audio frequency track circuit
TL;DR: A new engineering solution is proposed, which enables reducing the effect of noises on the input of the track receiver in the intervals between signal current pulses, and allows to increase a signal-to-noise ratio on the track Receiver input from 8% to 30%, depending on the interference parameters and the level of the useful signal.
Proceedings ArticleDOI
Development and Verification of Dynamic Electromagnetic Model of Asynchronous Motor Operating in Terms of Poor-Quality Electric Power
Kuznetsova Yevheniia,Kuznetsov Vitaliy,Tryputen Mykola,Kuznetsova Alisa,Tryputen Maksym,Babyak Mykola +5 more
TL;DR: Three-phase asynchronous motor with a short-circuited rotor has been described with the help of a model convenient for the analysis of changes of its power indices in terms of different values of all the indices of supply voltage quality.
References
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Wave propagation in overhead wires with ground return
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Distribution of the traction return current in AC and DC electric railway systems
TL;DR: In this article, the authors investigated the behavior of the return current in AC and DC electric railway systems, on the basis of a reference system for the variation of the most important electrical parameters.
Journal ArticleDOI
Measurement of AT electric railway system currents at power-supply frequency and validation of a multiconductor transmission-line model
R. Cella,Giuseppe Giangaspero,Andrea Mariscotti,A. Montepagano,P. Pozzobon,M. Ruscelli,M. Vanti +6 more
TL;DR: In this paper, an electric traction system supplied at 2 /spl times/ 25 kV with autotransformers (ATs) is considered, where the overhead supply conductors in contact with the train pantograph are connected to a symmetrical circuit (the feeder) with the purpose of current balancing; the traction return current flows from the rolling stock axles back to the supply (i.e., substation) through the traction rails and additional return conductors.
Proceedings ArticleDOI
Modelling of AC feeding systems of electric railways based on a uniform multi-conductor chain circuit topology
TL;DR: In this article, a mathematical model of the whole feeding system, i.e., the admittance matrix, can be assembled conveniently by appropriately modelling each element by appropriately modeling each element considering the relatively large leakage conductance of the current return rail to the ground.
Journal ArticleDOI
Power Flow Calculation for Traction Networks under Regenerative Braking Condition Based on Locomotive-Traction Network Coupling
TL;DR: In this article, a constant power load model on an all-parallel AT network multi-conductor chain circuit model is used to analyze the power flow calculation for high-speed electric multiple units (EMUs) under regenerative braking condition.