Journal articles: 'Railway traction'

1

Schnurmann, Robert. "Railway traction." Tribology International 20, no. 2 (April 1987): 108. http://dx.doi.org/10.1016/0301-679x(87)90098-3.

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Lesnikov, Dmitriy Valentinovich. "Modeling of direct current traction power system with the consideration for earth conductivity." Transport of the Urals, no. 2 (2020): 75–79. http://dx.doi.org/10.20291/1815-9400-2020-2-75-79.

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Nowadays, one of the main tasks facing the JSC Russian Railways is the increase of volumes of freight transportation. The solution of this task is directly connected with the increase of the load on traction power system devices and their strengthening, which is primarily related to railways electrified with direct current that are characterized by high traction currents. In order to assess the possibility to strengthen a railway section and reveal «bottlenecks» in traction power supply system it is necessary to create a mathematical model of traction power system that must consider parameters of a specific section including earth conductivity that affects the values of skin resistance, potential of railway network and stray currents. The paper proposes a mathematical model of direct current traction power system that represents a combination of a catenary model and a model of railway network. The model considers parameters of traction substations, connection scheme of catenary suspensions and possible influence of rails from adjacent tracks on each other.

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Rebrov, Ilya, Maksim Shevlyugin, Alexandr Kotelnikov, and Dmitry Ermolenko. "Electric power accumulators in system of supplying railways with traction energy by direct current." MATEC Web of Conferences 239 (2018): 01057. http://dx.doi.org/10.1051/matecconf/201823901057.

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The article describes core criteria, which define efficient application of energy accumulators in railway traction power supply system. Installation points for energy accumulators in electric power system of train electric drivers, where application is most effective, are identified. These points are railway sub-stations, electric traction network and traction power system. The main types of energy accumulators, which essentially can be used on railway transport in traction power system – traction sub-stations and traction network, electric motive power, are examined. They can be used on railway transport and. The quality factors of work for traction energy power and electric motive power are presented, improvement of which can be performed using energy accumulators. International experience of energy accumulators application for railway transport is presented. Russian developments and implementation of energy accumulators from domestic manufacturers are examined, both in the traction power system and in the electric rolling stock. The polygons for the most efficient use of energy storage in the traction power supplying system are identified.

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Hill, R. J. "Electric railway traction. Part 3: Traction power supplies." Power Engineering Journal 8, no. 6 (December 1, 1994): 275–86. http://dx.doi.org/10.1049/pe:19940604.

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Garramiola, Fernando, Javier Poza, Patxi Madina, Jon del Olmo, and Gaizka Almandoz. "A Review in Fault Diagnosis and Health Assessment for Railway Traction Drives." Applied Sciences 8, no. 12 (December 3, 2018): 2475. http://dx.doi.org/10.3390/app8122475.

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During the last decade, due to the increasing importance of reliability and availability, railway industry is making greater use of fault diagnosis approaches for early fault detection, as well as Condition-based maintenance frameworks. Due to the influence of traction drive in the railway system availability, several research works have been focused on Fault Diagnosis for Railway traction drives. Fault diagnosis approaches have been applied to electric machines, sensors and power electronics. Furthermore, Condition-based maintenance framework seems to reduce corrective and Time-based maintenance works in Railway Systems. However, there is not any publication that summarizes all the research works carried out in Fault diagnosis and Condition-based Maintenance frameworks for Railway Traction Drives. Thus, this review presents the development of Health Assessment and Fault Diagnosis in Railway Traction Drives during the last decade.

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Steimel, A. "Electric railway traction in Europe." IEEE Industry Applications Magazine 2, no. 6 (1996): 6–17. http://dx.doi.org/10.1109/2943.541241.

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DUFFY, M. C. "The Metadyne in Railway Traction." Transactions of the Newcomen Society 72, no. 2 (January 2000): 235–64. http://dx.doi.org/10.1080/03720187.2000.12023614.

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Chen, Chunyang, Wei Li, Youmei Liu, and Xiang Wei. "Exploration of key traction-running equipment and its problems on heavy-haul trains and research on technology development." Transportation Safety and Environment 2, no. 3 (August 29, 2020): 161–82. http://dx.doi.org/10.1093/tse/tdaa019.

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Abstract In recent years, heavy-haul train technology has seen a number of innovations worldwide, and train traction-running technology has also made great progress, resulting in a rich pool of experience and a range of promising applications. This paper summarizes the key technologies of traction running in heavy-haul combined trains, especially locomotive and rolling-stock technology, traction technology, braking technology, control technology, communication technology and safety technology. At the same time, based on an analysis of practical applications, this paper further explores the main problems and urgent needs of traction equipment on heavy-haul trains. With an eye to the future, the heavy-haul railway system will develop in the direction of informatization, automation and intelligence, in order to build a greener, more energy-saving, safer and more efficient railway. This paper therefore looks forward to the technical developments of heavy-haul combined trains, and provides a reference for the development of heavy-haul railways.

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Mukha, Andrii M., and Oleh I. Bondarr. "Reactive Power Compensation for Non-Traction Railway Consumers." Problemy Kolejnictwa - Railway Reports 64, no. 188 (September 2020): 129–35. http://dx.doi.org/10.36137/1884e.

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This paper deals with the problems of power supply efficiency for non-traction railway customers. Unlike public distribution networks, the non-traction power supply network is within the zone of influence of electromagnetic fields and the conductive influence of the distorted traction current. As a result, poor power quality and additional losses are typical for non-traction railway networks. Subsequently, conflicts due to the low quality of electricity may arise between the railway and its customers powered by the distribution networks of the railway. The influence of a reactive power compensation device on the voltage drop in a non-traction power line is investigated in the article. The implementation of reactive power compensation allows voltage losses during its transmission to the final consumer to be reduced by almost 5% and electricity losses by 3%. Keywords: non-traction consumer, power factor corrector, reactive power compensator, graph of electric network, nodal analysis

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Mekhedov, M. I., and N. V. Kornienko. "Influence of technical and technological equipment of a locomotive maintenance point on the capacity of a railway line." VNIIZHT Scientific Journal 80, no. 4 (September 1, 2021): 225–32. http://dx.doi.org/10.21780/2223-9731-2021-80-4-225-232.

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Stable operation of railway transport is of decisive importance in the development of the country's economy. Railway stations of the Russian Railways network perform a significant amount of work on processing and handling train traffic.Large technical stations on the Russian Railways network in most cases are located at the junction of railways (railway polygons), where locomotive crews and locomotives changes take place as well as various types of traction (electrified lines with direct and alternating current).With the development of polygon technologies on the Russian Railways network, it becomes necessary to optimize the traction resource management process to ensure the stable operation of train traffic from its origin to the point of its destination. At technical stations with locomotive turnover points, they are changed, as well as maintenance (TO-2) and equipment.The article discusses in more detail one of the elements of the daily budget for the use of locomotives — finding locomotives in one of the types of downtime — at the locomotive maintenance point. As an example of the queuing of traction resources, the point of maintenance of locomotives of the Karymskaya station is given, where the stalls for performing TO-2 are one of the types of devices of the locomotive economy, according to which the available capacity of the locomotive circulation section is determined. Based on the analysis of the results of the operation of the locomotive maintenance point of the Karymskaya station for 2017, a method has been developed that allows, using in the calculations the minimum interval for the supply of trains to the station, to determine the rational number of stalls mст, necessary for the development of promising volumes of freight transportation and increasing the capacity of railway lines.

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11

Hill, R. J. "Electric railway traction. Part 1: Electric traction and DC traction motor drives." Power Engineering Journal 8, no. 1 (February 1, 1994): 47–56. http://dx.doi.org/10.1049/pe:19940105.

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12

Jerzy, Wojciechowski, Syc Józef, Perzyński Tomasz, and Łukasik Zbigniew. "Diagnostics of the 3 Kv DC Traction Power Network." International Journal of Engineering & Technology 7, no. 4.3 (September 15, 2018): 201. http://dx.doi.org/10.14419/ijet.v7i4.3.19735.

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The railway traction network line is one of the technical elements ensuring proper operation of railway traffic. Due to its technical function and specificity, it is an essential element of the railway infrastructure. That is, why diagnostics of traction networks is a very important issue. In the article, the authors presented issues related to the diagnostics of 3kVDC traction networks. An analysis of traction network faults for a group of power supply areas was also presented. Additionally, calculations of damage indicators in a selected, representative power supply area are presented. On the basis of made an analysis authors proposed solutions aimed at minimizing breakdowns in traction networks.

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13

Xu, Xiang Zheng, and Wei Wan. "Research on Harmonic Detection Methods of Electrified Railway." Advanced Materials Research 301-303 (July 2011): 1740–43. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1740.

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This paper introduces the characteristics of the traction power system of electric railway, and explores the harms to the power system caused by electric railway and the necessity of harmonic suppression of traction power supply system. In order to achieve real-time detection and compensation for harmonic waves of electric railway traction power system, this paper provides an improved harmonic detection method with initial compensating angle of delay time. Detection method is simple, and has better real-time, it can be used to detect selective harmonic for electrified railway.

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14

Pollard, M. G. "Time Present and Time Past." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 204, no. 1 (January 1990): 1–20. http://dx.doi.org/10.1243/pime_proc_1990_204_181_02.

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The Railway Division Chairman recalls his early interest in aeronautical engineering and then goes on to review his career in British Railways, giving details of some of the projects with which he has been involved. He discusses the role of development and the importance of building and testing prototypes, and outlines some successful long-term developments in the aircraft and railway industries. He then describes some current developments taking place in British Railways which will have important implications for the future. These include a.c. traction systems, noise reduction, strategies to reduce energy consumption, health monitoring and diagnostics of railway systems, non-destructive testing and crashworthiness.

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15

Popa, Gabriel, Ioan Sebeşan, Sorin Arsene, Răzvan Oprea, and Claudiu Nicolae Badea. "Optimizing Power Consumption of the Electric Vehicle Traction." Applied Mechanics and Materials 809-810 (November 2015): 1103–8. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.1103.

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The study refers to optimizing energy consumption from electric trains, underground trains and electric locomotives. The actual requirements of the dynamic market economy are forcing the railway system to transform into a reliable alternative to the road and air traffic. From this perspective, the railways have to fulfill two key elements: Economical efficiency and reliability and to offer what the potential customer needs. One of the main elements is the respect of the timetables or (if possible) the decrease of the running times. The running time is the main referential, especially when it’s related to the power consumption. The optimization of the running times and the power consumption is the most important target for railway operators and depends on the correct choice of the drive regimes. Article deals with energy optimization from the perspective of traction. Analysis can be applied also to diesel railcars and diesel locomotives.

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16

Xie, Shaofeng, Yiming Zhang, and Hui Wang. "A Novel Co-Phase Power Supply System for Electrified Railway Based on V Type Connection Traction Transformer." Energies 14, no. 4 (February 23, 2021): 1214. http://dx.doi.org/10.3390/en14041214.

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Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed and heavy railway. The co-phase power supply technology is one of the best ways to solve these two technical problems. At present, a V type connection traction transformer is widely used in a power frequency single-phase AC traction power supply system, especially in high-speed railway. In this paper, a new type of co-phase power supply system for electrified railway based on V type connection traction transformer is proposed. One single-phase winding in the V type connection traction transformer is used as main power supply channel, and three ports are used as compensation ports. Neutral section is no longer set with traction substation, and the train is continuously powered through. The independent single-phase Static Var Generators (SVGs) are used to compensate the three-phase imbalance caused by single-phase traction load. When necessary, the power factor can be improved at the same time. The principle, structure, control strategy, and capacity configuration of the technical scheme are analyzed in this paper, and the effectiveness of the scheme is verified by using the measured data of electrified railway. The advantage of this scheme lies in the universal applicability of the V type connection traction transformer, and the flexibility of the SVG device.

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17

Hill, R. J. "Electric railway traction. Part 7: Electromagnetic interference in traction systems." Power Engineering Journal 11, no. 6 (December 1, 1997): 259–66. http://dx.doi.org/10.1049/pe:19970610.

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18

Bosyi, Dmytro O., and Denys R. Zemsky. "Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers." Problemy Kolejnictwa - Railway Reports 64, no. 188 (September 2020): 93–102. http://dx.doi.org/10.36137/1881e.

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The article is devoted to the problem of non-traction consumers power supply of AC railways. The low efficiency of energy transfer is caused by the design of a non-traction power supply line. The absence of bilateral power is typical for non-traction network 27,5 kV which consist of “two wire-rail” lines. This line is outdated technology, which does not correspond to modern requirements on the power quality, but used on AC railways with three-phase traction transformers. The purpose of the article is to investigate the methods of power supply improvements for non-traction consumers in terms of voltage unbalance, harmonic distortions and energy losses. Connection of the phasing device to delta winding traction transformer for bilateral supplying non-traction customers from network 27,5 kV is suggested in the article. The implementation of a method to increase the efficiency of electricity transmission in the non-traction network power supply allows to reduce power losses from 720 MWh / year to 441 MWh / year, the voltage unbalance from 1,9% to 1,3% and the total harmonic distortion from 8 % to 6 % respectively. Additionally, investment attractiveness of the decision was evaluated. Keywords: non-traction customers, two wire-rail line, phase coordinates, AC railway, power quality

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19

Li, Xue Wu, and Peng Xiao Ji. "Railway Traction Power Supply System of Modeling and Simulation Optimization Research." Advanced Materials Research 1055 (November 2014): 312–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1055.312.

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Revamping of electrified railway traction power supply is to improve the railway transport capacity and important measures to promote the development of national economy. As a result of the traction power supply voltage was higher, the simulation technology was applied to modification of the traction power supply system. For the development of research workers to reduce risk and funding has become an international practice. Traction power supply system and the modeling and simulation of the traction power supply capacity technology are discussed in detail. It points out the simulation technology in the development direction of expansion engineering in the application of traction power supply.

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20

DUFFY, M. C. "The Still Engine and Railway Traction." Transactions of the Newcomen Society 59, no. 1 (January 1987): 31–59. http://dx.doi.org/10.1179/tns.1987.004.

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21

DUFFY, M. C. "The Gas Turbine in Railway Traction." Transactions of the Newcomen Society 70, no. 1 (January 1998): 27–58. http://dx.doi.org/10.1179/tns.1998.002.

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22

Duffy, M. C. "Three-phase motor in railway traction." IEE Proceedings A Science, Measurement and Technology 139, no. 6 (1992): 329. http://dx.doi.org/10.1049/ip-a-3.1992.0053.

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23

Spiryagin, Maksym, Peter Wolfs, and Colin Cole. "Modelling of traction in railway vehicles." Vehicle System Dynamics 53, no. 5 (April 23, 2015): 603–4. http://dx.doi.org/10.1080/00423114.2015.1028944.

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24

Dincel, Emre, Handan Nak, Şirin Akkaya, Mehmet Canevi, İlhan Mutlu, and M. Turan Söylemez. "Robust Control of Railway Traction System." IFAC-PapersOnLine 51, no. 25 (2018): 171–77. http://dx.doi.org/10.1016/j.ifacol.2018.11.100.

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25

Wu, Jun Yong, Hong Jun Fu, Jian Hua Sun, Xi Lu Zhang, and Lu Yu Ji. "Distribution Calculation of Harmonics and Unbalance in Power System Including Railway Traction Substations." Advanced Materials Research 433-440 (January 2012): 3470–78. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.3470.

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Harmonics and unbalance in Henan power system become more and more serious while a large number of traction substations of high-speed railway are put into operation and traction power increases. In this paper, the distributions of harmonics and unbalance in Henan electric power system are studied. Firstly, three-phase fundamental and harmonic models of the whole system including railway traction substations are built, and a decoupled method of power flow is put forward. Then, the power system harmonic penetration (PSHP) software package is developed, and the power quality of two railway traction substations has been measured. At last, the distributions of harmonics and unbalance of Zhengzhou power network are calculated and compared with the measured results under different traction powers. Some rules of the distributions have been summarized and some advices have been put forward.

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Wang, Guo, Ming Xing Tian, En En Ren, and Li Na Ding. "Comprehensive Analysis of Active Electrified Railway Compensation." Advanced Materials Research 204-210 (February 2011): 1675–78. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1675.

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Traction load in electrified railway result in the power supply system contains a lot of negative sequence, harmonic and reactive current. It is necessary to analysis the compensation principle based on active compensation of electrified railway traction power supply system. According to the relation between primary winding and secondary winding of regular traction transformer, we deduced general voltage and general current transform formula, and then deduced completely and negative sequence compensation formulas. It also gives the method of reduce active compensation capacity.

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Massel, Andrzej. "Operational criteria in the justification of electrification of railway lines." MATEC Web of Conferences 180 (2018): 06005. http://dx.doi.org/10.1051/matecconf/201818006005.

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The process of electrification of the Polish railways took place from 1936 till early 1990s. Despite the political constraints of the post-war times, the decisions on electrification of particular sections of the railway network were usually based on economic factors. In 1970s and 1980s so called electrification thresholds were used to justify the need for electrification of railway line in question. They took into the number of tracks (single-track lines, double-track lines), terrain conditions (flat terrain, upland terrain) and the traffic structure (the share of passenger traffic) into account. In the framework of National Railway Program till 2023 (KPK) the realization of electrification projects have been undertaken again. The present paper deals with importance of the operational criteria in the decision-making concerning justification of electrification of railway lines. These criteria include the shortening of the journey times on particular sections, shortening of stops on the stations with the change of the type of traction, the savings of train operating companies resulting from the traction unification (change of demand for rolling stock and for workshops for its servicing), improvement of reliability and punctuality of services.

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Wu, Yunkai, Bin Jiang, Ningyun Lu, and Yang Zhou. "Bayesian Network Based Fault Prognosis via Bond Graph Modeling of High-Speed Railway Traction Device." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/321872.

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Reliability of the traction system is of critical importance to the safety of CRH (China Railway High-speed) high-speed train. To investigate fault propagation mechanism and predict the probabilities of component-level faults accurately for a high-speed railway traction system, a fault prognosis approach via Bayesian network and bond graph modeling techniques is proposed. The inherent structure of a railway traction system is represented by bond graph model, based on which a multilayer Bayesian network is developed for fault propagation analysis and fault prediction. For complete and incomplete data sets, two different parameter learning algorithms such as Bayesian estimation and expectation maximization (EM) algorithm are adopted to determine the conditional probability table of the Bayesian network. The proposed prognosis approach using Pearl’s polytree propagation algorithm for joint probability reasoning can predict the failure probabilities of leaf nodes based on the current status of root nodes. Verification results in a high-speed railway traction simulation system can demonstrate the effectiveness of the proposed approach.

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Uyulan, Çağlar, and Metin Gokasan. "Modeling, simulation and re-adhesion control of an induction motor–based railway electric traction system." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 232, no. 1 (September 30, 2017): 3–11. http://dx.doi.org/10.1177/0959651817732487.

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Increasing the traction force is a complex problem in the design of railway vehicles; therefore, effective traction systems and algorithms have to be developed. During the traction process, the verification of traction algorithms and control strategies are based on simulations covering all locomotive dynamics. In this article, traction model of a railway vehicle and re-adhesion control method based on simulation approach are investigated to obtain more effective results. The longitudinal dynamic of a railway vehicle having traction system, which comprises two parallel motor groups, each of which has two field-oriented induction motor connected in series, is simulated to examine time-dependent changes in motor stator currents, traction torque, adhesion and resistance forces according to a given speed reference. The interaction between the adhesion force and the slip ratio is established according to the Burckhardt adhesion model, and a modified super-twisting sliding mode slip control is implemented in a computer simulation under various contact conditions so that simulation results approve the presented control method works under the maximum adhesion force. The comparison between the classical and modified version of the proposed control strategy was made to better evaluate the performance of the control system and to better optimize the traction system.

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Sirina, N. F., and S. S. Yushkova. "Integrative management of infrastructure and traction equipment at the railway area." Vestnik of the Railway Research Institute 78, no. 6 (January 4, 2020): 328–39. http://dx.doi.org/10.21780/2223-9731-2019-78-6-328-339.

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Railway transport is in condition of preparation for fulfillment of the forecast increase of transportation. The level of effectiveness and quality of the railways operation is assessed by the period of delivery to the point of destination of required volume of transported freight, which growth increases intensity of infrastructure wear and tear, which requires breaks in trains movement for providing “gaps” for the track repair operations and inevitably results in the delivery time increase.The use of the best speed path of trains is an important component of ensuring energy effectiveness. Transition to the ground process of trains’ movement control allows JSC “RZD” to arrange rhythmic movement of the car traffic movement providing “gaps” in the single opening for the entire ground.Conducted SWOT-analysis determined the risks and potential results of use of the single infrastructure of the railway area in terms of possible additional expenses in the future. Control mechanism of operation costs was proposed, which allows analyzing actual direct expenses and comparing deviations with regard to the set values. Overall algorithm of the model of integrative control of infrastructure and traction resources was formalized, which is illustrated by the example of participants of transportation process at the railway area. The basis of their interaction is the results of integral assessment that generalized various quantity of indicators and assessment factors of transportation process.Mathematical support of procedures of establishing the cost price is implemented in the Intellectual system of control and handling of the locomotive fleet at the area of the railway production infrastructure. Obtained results are integrated in the Automated control system of operation of the single center of infrastructure control and are set for transformation, effective use of the industrial companies potential.Key trends of the geo-economic condition having direct relation to the transportation and logistic operation in Russia determine necessity of effective management of traction resources by means of arrangement of the uniform process of transportation operation of JSC “RZD”, which results in the best use of transportation infrastructure, balanced increase of the volumes of loading and attraction of investments to the railways.

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Krzysztoszek, Konrad. "Mathematical model of traction vehicle movement." Journal of Automation, Electronics and Electrical Engineering 1, no. 1 (December 31, 2019): 37–42. http://dx.doi.org/10.24136/jaeee.2019.005.

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The article presents a mathematical model of electric traction vehicle movement in a given power supply area. Starting from the presentation of the basic features of the 3 kV DC traction power supply system used in Poland, the author presents a simulation model of electric traction vehicles movement, which allows to determine the mobility and current - voltage possibilities on a selected railway line. The obtained simulation results fully confirm the possibility of using the model as an aid in the design, modernization or diagnostics of existing railway lines and train traffic.

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Tian, Zhongbei, Ning Zhao, Stuart Hillmansen, Shuai Su, and Chenglin Wen. "Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes." Energies 13, no. 11 (June 1, 2020): 2788. http://dx.doi.org/10.3390/en13112788.

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The simulation of railway systems plays a key role in designing the traction power supply network, managing the train operation, and making changes to timetables. Various simulation technologies have been developed to study the railway traction power network and train operation independently. However, the interactions between the load performance, train operation, and fault conditions are not fully understood. This paper proposes a mathematical modeling method to simulate the railway traction power network with a consideration of a multi-train operation, driving controls, under-voltage traction, and substation fault modes. The network voltage, power load demands, and energy consumption according to the existing operation are studied. The hotspots of the power supply network are identified based on an evaluation of the train operation and power demand. The impact of traction power substation (TPSS) outage and a short circuit on the power supply network have been simulated and analyzed. The simulation results have been analyzed and compared with those of a normal operation. A case study based on a practical metro line in Singapore is developed to illustrate the power network evaluation performance.

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Su, Ruiye, Leishan Zhou, and Jinjin Tang. "Locomotive Schedule Optimization for Da-qin Heavy Haul Railway." Mathematical Problems in Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/607376.

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The main difference between locomotive schedule of heavy haul railways and that of regular rail transportation is the number of locomotives utilized for one train. One heavy-loaded train usually has more than one locomotive, but a regular train only has one. This paper develops an optimization model for the multilocomotive scheduling problem (MLSP) through analyzing the current locomotive schedule of Da-qin Railway. The objective function of our paper is to minimize the total number of utilized locomotives. The MLSP is nondeterministic polynomial (NP) hard. Therefore, we convert the multilocomotive traction problem into a single-locomotive traction problem. Then, the single-locomotive traction problem (SLTP) can be converted into an assignment problem. The Hungarian algorithm is applied to solve the model and obtain the optimal locomotive schedule. We use the variance of detention time of locomotives at stations to evaluate the stability of locomotive schedule. In order to evaluate the effectiveness of the proposed optimization model, case studies for 20 kt and 30 kt heavy-loaded combined trains on Da-qin Railway are both conducted. Compared to the current schedules, the optimal schedules from the proposed models can save 62 and 47 locomotives for 20 kt and 30 kt heavy-loaded combined trains, respectively. Therefore, the effectiveness of the proposed model and its solution algorithm are both valid.

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Helak, Magdalena, Piotr Smoczyński, and Adam Kadziński. "Assessment of change in maintenance of railway vehicles." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 420–23. http://dx.doi.org/10.24136/atest.2018.426.

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Change is a concept that has always accompanied humanity, but at the same time – is underestimated in the context of introducing changes in various types of enterprises. This also applies to railway undertakings, which have recently been allowed to shape (change) the manner of maintaining passenger and traction railway vehicles. The article presents a literature analysis concerning the problem of change management and the railway regulations in force in this respect. Then, an exemplary assessment of the significance of change in maintaining the electric traction unit is shown.

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Kobayashi, Hiroyasu, and Keiichiro Kondo. "Power Electronics Technologies for Railway Vehicle Traction." Journal of Japan Institute of Electronics Packaging 20, no. 7 (2017): 437–41. http://dx.doi.org/10.5104/jiep.20.437.

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36

Matsuoka, Koichi, and Hiromi Muramoto. "I. Traction Motors for Use in Railway." IEEJ Transactions on Industry Applications 117, no. 9 (1997): 1049–53. http://dx.doi.org/10.1541/ieejias.117.1049.

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37

Prytula, M. G., and О. А. Pasechnyk. "OPTIMIZATIONAL TRACTION TASKS ON THE RAILWAY NETWORK." Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, no. 3(81) (June 27, 2019): 44–64. http://dx.doi.org/10.15802/stp2019/171774.

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Sovička, Pavel, Matěj Pácha, and Pavol Rafajdus. "Model Railway Traction Performance Measurements and Analysis." Procedia Engineering 192 (2017): 824–29. http://dx.doi.org/10.1016/j.proeng.2017.06.142.

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Kuznetsov, S. M., E. O. Pokhomchikova, E. V. Faizrahmanova, and K. R. Avetisyan. "Digital computer protection of railway traction network." Journal of Physics: Conference Series 1333 (October 2019): 022010. http://dx.doi.org/10.1088/1742-6596/1333/2/022010.

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40

Matsuoka, Koichi, and Minoru Kondo. "Energy Saving Technologies for Railway Traction Motors." IEEJ Transactions on Electrical and Electronic Engineering 5, no. 3 (May 2010): 278–84. http://dx.doi.org/10.1002/tee.20530.

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41

Kuchumov, V. A., R. V. Murzin, N. B. Nikiforova, M. S. Khazov, and A. A. Akishin. "Functional safety of traction railway rolling stock." Vestnik of the Railway Research Institute 75, no. 3 (2016): 131–39. http://dx.doi.org/10.21780/2223-9731-2016-75-3-131-139.

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Garg, Rachana, Priya Mahajan, and Parmod Kumar. "Digital Model of Railway Electric Traction Lines." Journal of The Institution of Engineers (India): Series B 98, no. 4 (August 22, 2016): 377–84. http://dx.doi.org/10.1007/s40031-016-0256-2.

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Shurova, Natalia, and Valerii Li. "Increase of energy efficiency of electric power distribution networks by adjustment of reactive energy consumption in a traction network." MATEC Web of Conferences 239 (2018): 01049. http://dx.doi.org/10.1051/matecconf/201823901049.

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In the past few years, there has been a trend towards an increase in the volume of transportation by railway. At the same time, the load on the railway infrastructure increases, in particular, on the traction power supply system. It is necessary to solve the problem of increasing the energy efficiency of the external electric power supply system in the conditions of growing freight turnover and taking into account the uncertainty of the initial data. The paper considers one of the methods of strengthening the traction power supply system. Based on the results of the study, an algorithm was developed for selecting the installation sites and power of compensating devices in a traction network in the conditions of increasing freight turnover and under the condition of increasing the energy efficiency of the external power supply system of traction substations due to unloading of supply lines by reactive power and leveling the load in phases. This methodology includes predicting power consumption, determining the installation sites and power of compensating devices in the traction network under condition of uncertainty of the initial data, and then assessing the energy efficiency of the decision made. A calculation was carried out for the proposed algorithm for a section of the Far Eastern Railway which includes nine traction substations.

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Mariscotti, Andrea. "Measuring and Analyzing Power Quality in Electric Traction Systems." International Journal of Measurement Technologies and Instrumentation Engineering 2, no. 4 (October 2012): 21–42. http://dx.doi.org/10.4018/ijmtie.2012100103.

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Power Quality phenomena in a broad sense, stationary and transient, are considered focusing on railway applications: dc and ac traction lines are considered, identifying the main sources (fixed, like substations, and moving, like vehicles), their characteristic emissions, how they propagate and combine along the traction lines and back to the three-phase ac supply lines. The analysis covers the railway standards applicable to the traction line and the industrial standards applicable to the ac feeding lines. The peculiarity of railway applications, that is the presence of moving distorting loads interconnected by a non-ideal transmission line and characterized by variable operating conditions and by the superposition of multiple sources with different dynamics, requires specific processing, analysis and visualization methods, that are addressed by means of examples based on real data.

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TAKAHARA, EIMEI. "Technological Trend of AC Traction Drive System for Railway Vehicles. 2. Power Electronics and Railway Traction Control Strategy." Journal of the Institute of Electrical Engineers of Japan 122, no. 9 (2002): 601–5. http://dx.doi.org/10.1541/ieejjournal.122.601.

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Chen, Jia Yong, Kun Ya Guo, Peng Jin, and Shu Han Wang. "Research on Single-Phase Back-to-Back SVG Solution of Power Pollution of Traction Transformer to Accessed Grid." Applied Mechanics and Materials 687-691 (November 2014): 3411–14. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3411.

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Electrified railway traction transformer is a pivot that connects the electric locomotive and the public grid. Therefore, power quality problems caused by electric locomotive such as three-phase voltage imbalance, great voltage fluctuation and high harmonic content can be transmitted to the public grid via the traction transformer. To solve this problem, the solution of two sets of single-phase SVG (Static Var Generator) in back-to-back operation to solve power quality problems of the electrified railway is raised. This solution has been proved by practice effective in improving power quality of the traction transformer.

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Vaiškūnaitė, Rasa, and Vilma Jasiūnienė. "THE ANALYSIS OF HEAVY METAL POLLUTANTS EMITTED BY RAILWAY TRANSPORT." Transport 35, no. 2 (May 20, 2020): 213–23. http://dx.doi.org/10.3846/transport.2020.12751.

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Recently, concern for a rapid increase in heavy metal pollutants released by railway transport has been expressed. Most of pollutant emissions from combustion processes are related to fuel consumption in the internal combustion engines of traction rolling stock. The main pollutants released into the environment cover particulate matter, volatile non-methane organic compounds, sulphur dioxide and nitrogen oxides. In this way, it is likely that the biggest polluters of the environment are traction units with internal combustion engines. However, other types of pollution are possible, where polluters can be not only traction rolling stock with the internal combustion engines, but also electric locomotive. For example, when due to friction of metals and deterioration of rolling stock wheels, heavy metals such as aerosols are released into the atmosphere, soil, surface and ground water, etc. and severely pollute the railway environment. Along with an increase in the electrification of railways, local environmental pollution is likely to be increased in the future. High pollution by heavy metals can also occur near the track storing creosote-impregnated wooden railway sleepers. Having analysed railway transport intensity and in order to assess pollution level, the stations of three major cities of Lithuania (Vilnius, Kaunas and Klaipėda) were selected to investigate heavy metal pollutants (lead (Pb), cadmium (Cd), zinc (Zn)) acting as the most toxic and widespread elements. The highest concentrations of Pb (up to 50 mg/kg) were found at a distance of 5.0 m from railway sleepers in the upper (up to 10 cm) soil layer at Vilnius Railway Station. A comparison of the results of the investigated soil across the tested stations showed that Klaipėda Railway Station was the area most polluted with Cd. The highest concentrations of Cd (up to 1.5…1.8 mg/kg) were established at a varying distance of 5…10 m from the sleepers in the upper (up to 10 cm) soil layer of light loam. Among the investigated stations, the lowest pollution by heavy metals, including Zn, was found at Kaunas Railway Station where sandy loam dominated. A comparison of heavy metal pollutants deposited on the intact used and rotten wooden railway sleepers disclosed that the latter were more heavily contaminated with heavy metals and made from 8 to 13 mg/kg for Pb, from 0.3 to 1.2 mg/kg for Cd, from 13.8 to 66 mg/kg for Zn.

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Hill, R. J. "Electric railway traction. Part 2: Traction drives with three-phase induction motors." Power Engineering Journal 8, no. 3 (June 1, 1994): 143–52. http://dx.doi.org/10.1049/pe:19940311.

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Steczek, M., A. Szeląg, and D. Chatterjee. "Analysis of disturbing effect of 3 kV DC supplied traction vehicles equipped with two-level and three-level VSI on railway signalling track circuits." Bulletin of the Polish Academy of Sciences Technical Sciences 65, no. 5 (October 1, 2017): 663–74. http://dx.doi.org/10.1515/bpasts-2017-0071.

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Abstract Electric traction vehicles cooperating with a 3kV DC traction system and equipped with drive systems based on voltage source inverters are the most significant sources of disturbances for a railway signalling system. Every traction vehicle to be authorised for operation on railway lines must fulfil the limits imposed on current harmonics magnitudes and those provided by railway operators. The solution introduced for prototypes of most modern traction drives is to replace the two-level inverters with three-level topology. Therefore, it is essential to establish the influence of the new solution on the railway signalling system. This paper presents a comparative analysis between simulation results delivered for two and three-level traction drive system regarding generation of disturbing current harmonics. Two types of VSI modulation techniques were taken under consideration: sinusoidal PWM (SPWM) and a new one, proposed by the authors, based on selective harmonic elimination (SHE). Furthermore, the authors presented application of one of the SHE based optimization techniques for shaping the EMU’s (electric multiple unit) DC side input current harmonics spectrum in order to meet the required limits. The described technique is based on off-line generation of a set of solutions for each of the VSI operating points and selection of the best solution for the assumed criteria. The applied simulation models and the concept of SHE control were verified in a laboratory by means of a low-power drive stand. Using the three-level inverter in traction drives system results in less current harmonics than using two-level topology without modification of the modulation technique. Thus, it does not guarantee fulfilling all limits assumed in this paper. The proposed modulation technique allows for fulfilling the limits, and the technical implementation of the proposed technique in a traction drive system will be considered in future studies.

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Li, Valerij, and Yuliya Konstantinova. "Simulation modeling balancing current in the traction network of a substation group." E3S Web of Conferences 178 (2020): 01067. http://dx.doi.org/10.1051/e3sconf/202017801067.

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This article is devoted to assessing the transit of electricity from an external electrical power supply system through the traction network of a railway district that includes nine traction substations. Substation transformers has star-delta-11 connection. The paper presents a simulation model of the railway district implemented in the MATLAB/Simulink software package. Various options of loading the external power supply system are modeled including into account the symmetrical load of the external network and the single-phase load of traction substations. The values of the voltage difference on the traction windings of power transformers of adjacent substations that occurs at different loads, the balancing currents that this difference creates and real power losses in the inter-substation areas are calculated.

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Journal articles on the topic 'Railway traction'

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