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Journal articles on the topic 'Overhead contact line'

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Author: Grafiati

Published: 14 March 2023

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1

KUSUMI, Shunichi, Takahiro FUKUTANI, and Kazuyoshi NEZU. "Diagnosis of Overhead Contact Line based on Contact Force." Quarterly Report of RTRI 47, no. 1 (2006): 39–45. http://dx.doi.org/10.2219/rtriqr.47.39.

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2

Smerdin, Aleksandr, Elena Butenko, Mikhail Mikhailov, and Victor Philippov. "Improve hardware facilities and work algorithms of overhead contact line remote monitoring systems." E3S Web of Conferences 363 (2022): 01048. http://dx.doi.org/10.1051/e3sconf/202236301048.

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An autonomous diagnostic measuring device, that allows to reduce expenses for the maintenance and the need for highly qualified personnel, is proposed in the article. The described algorithm of the work of the measuring system allows setting pre-failure conditions of an overhead contact line during exploitations of the software complex. The Installation scheme of the measuring complex on an overhead contact line equipment and the functional scheme of the software and hardware complex are described. The experimental dependence of the vibration frequency on the contact wire tension is defined for various overhead contact line spans. The limits of the variation of the vibration frequency for various combinations of overhead contact line parameters are defined.

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3

Skrzyniarz, Marek, Włodzimierz Kruczek, Kamil Mike, and Piotr Stypułkowski. "Development of a Model of Current Distribution in the Overhead Contact Lines for an Innovative de-Icing System." Problemy Kolejnictwa - Railway Reports 66, no. 195 (June 2022): 135–39. http://dx.doi.org/10.36137/1956e.

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Icing on the overhead contact line exclude the possibility of efficient current collection from the overhead contact line. The effects of icing can result in losses for carriers due to delay or cancellation of trains and also cases of damage to the traction infrastructure and pantographs. The existing methods of de-icing the traction network (mechanical, chemical and electrical) are currently ineffective. Therefore, it is necessary to develop a new electrical method that takes into account the detailed current fl ow in the over-head contact line. This article presents a model for calculating the current fl ow in the overhead contact line and the resistances of droppers, suspension elements, and distance holders measured on the basis of actual measurements. Keywords: simulation model, de-icing of the contact line, current flow in the contact line

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4

Sugama, Yoji, Toshihide Kishi, and Nobuyuki Ishioka. "1B31 Development of an Overhead Contact Line Equipment Monitoring System(Condition Monitoring-Vehicle)." Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH 2015 (2015): _1B31–1_—_1B31–9_. http://dx.doi.org/10.1299/jsmestech.2015._1b31-1_.

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5

Bryja, Danuta, and Dawid Prokopowicz. "Discrete-continuous computational model of the coupled dynamic system: pantograph – overhead contact line." Transportation Overview - Przeglad Komunikacyjny 2016, no. 5 (May 1, 2016): 71–83. http://dx.doi.org/10.35117/a_eng_16_05_08.

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The paper presents the computational model of the pantograph – overhead contact line (OCL), which uses the theory of cable vibrations and Lagrange – Ritz approximation method to derive equations of motion of the overhead contact line subjected to moving pantographs. The pantograph is modelled as a dynamic system of two degrees of freedom describing the motion of two masses replacing a collector head and an articulating frame. The overhead contact line is defined as a catenary system with continuously distributed mass. It consists of a multi-span cable characterized by a curvilinear route (catenary wire) and a straight cable (contact wire) connected with a catenary wire by elastic droppers. The main objective of the paper is to present principal ideas of the computational model, with a particular emphasis on formulating the equation of motion of a pre-tensioned multi-span cable with non-negligible static sag. Much attention is paid to the description of dynamic interaction between the pantograph and overhead contact line. The model allows computer simulation of catenary vibrations induced by two pantographs passing over the contact line, as well as a simulation of dynamic increments of the contact force.

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6

Sun, Zhong Guo, Xiang Dong Li, and Wei Dong Wang. "Measuring Model of Dynamic Contact Force." Advanced Materials Research 503-504 (April 2012): 1614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1614.

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There are no systematic studies reported on measuring model of dynamic contact force between pantograph and overhead line. Keep this in view, the high-speed measuring model of dynamic contact force between pantograph and overhead line is discussed in details in this article. Based on the analysis of forces acting on the pantograph, measuring model of dynamic contact force is constructed with the mass correction and aerodynamic compensation. The results of verifying running test are given in the end of article to show that the measuring model is effective practically.

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7

Kadiri, Karim, Anne-Cécile Roks, Tayeb Touat, and Yannick Lecluse. "Combined Portal Frames for Signalling and Overhead Contact Line." IABSE Symposium Report 99, no. 15 (May 6, 2013): 378–79. http://dx.doi.org/10.2749/222137813806501722.

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8

Li, Xing Wang, and Ju Rui Yang. "Transient Responses in Continuous Co-Phase Traction Power Supply System." Advanced Materials Research 1006-1007 (August 2014): 955–61. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.955.

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Continuous co-phase traction power supply system is the major change of the traction power supply. It is important to analyze the transient response characteristics of overhead contact line for the traction substation feeder protection. This article introduces the main structure of continuous co-phase traction power supply system and the control strategy of traction substation. Meanwhile, transient responses of overhead contact line in the earth short circuit are studied, including metallic earth short circuit and non-metallic earth short circuit (high resistance ground). In the PSCAD/EMTDC electromagnetic transient simulation environment, the effects on the system and the recovery process are studied which the fault occurred in the output interface of traction substation and occurred in overhead contact line.

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9

Bryja, Danuta, and Adam Popiołek. "Initial validation of the method for simulating the dynamic interaction between pantograph and overhead contact line." Transportation Overview - Przeglad Komunikacyjny 2017, no. 6 (June 1, 2017): 34–45. http://dx.doi.org/10.35117/a_eng_17_06_04.

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The paper presents the results of initial validation of the method for simulating the dynamic interaction between a pantograph and a overhead contact line. According to European Standard EN50318, the first step of validation was done, which consists of comparison of the simulation results with limit values given in European Standard for the reference model. The dynamic behaviour characteristics, in terms of TSI ENE, were calculated from simulated vibrations of the ten-span overhead contact line and the pantograph, and the rate of contact force change in time. Geometrical and mechanical parameters of the overhead contact line and the pantograph were based on the annex to European Standard EN50318. It was proved, that the part of the characteristics meets European Standard requirements and the other slightly exceed the limit values. Based on the analysis, the direction of further research was proposed.

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10

Smerdin, Aleksandr, Gleb Ermachkov, Oleg Sidorov, and Daniil Petin. "The use of predictive analysis algorithms and methods for the overhead contact line operation mode selection." E3S Web of Conferences 363 (2022): 01049. http://dx.doi.org/10.1051/e3sconf/202236301049.

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The article tells about the problem of the railway infrastructure objects reliable, safe, and effective operation on an example of the overhead contact line operation mode rational selection. The overhead contact line operation mode modelling results are described. The model is considering exploitation and climatic conditions and is based on the clusterization, classification, and neuronal network modelling methods for predictive analysis of a large amount of data.

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11

ABOSHI, Mitsuo, Shunichi KUSUMI, and Takuya KURAOKA. "Diagnosis Method of Overhead Contact Line Stress Based on Contact Force of Pantograph." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 77, no. 777 (2011): 1772–80. http://dx.doi.org/10.1299/kikaic.77.1772.

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12

Özer, Derya. "Validation of Contact Wire Simulations on the Basis of Scaled Down Contact Wire Cutting Experiments." Key Engineering Materials 450 (November 2010): 457–60. http://dx.doi.org/10.4028/www.scientific.net/kem.450.457.

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As the requirements for overhead contact line systems increase due to higher train speeds, the need of safety equipment for these systems increases as well. Developing a component for the case of a contact wire cut to prevent further damage from the overhead contact line system requires an extensive knowledge about the system behaviour. Therefore, a comprehensive multi body system model (MBS) is developed in Matlab SimMechanics environment. In order to validate the datas generated from the simulations, a contact wire test stand has been constructed where cutting experiments can be run by releasing a pretensioned wire. Consequently, the force distribution during the contact wire cut is analyzed and these values are compared with the simulation results. For the comparisons, much attention is given to the period after the contact wire cut.

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13

Anane, Paul Oswald Kwasi, Qi Huang, Patrick Nyaaba Ayimbire, and Olusola Bamisile. "Non-contact measurement of traveling wave of overhead transmission line." Measurement 181 (August 2021): 109557. http://dx.doi.org/10.1016/j.measurement.2021.109557.

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14

Aboshi, Mitsuo. "Precise Measurement and Estimation Method for Overhead Contact Line Unevenness." IEEJ Transactions on Industry Applications 124, no. 9 (2004): 871–77. http://dx.doi.org/10.1541/ieejias.124.871.

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15

KUSUMI, Shunichi, Kazuyoshi NEZU, and Hiroki NAGASAWA. "Overhead Contact Line Inspection System by Rail-and-Road Car." Quarterly Report of RTRI 41, no. 4 (2000): 169–72. http://dx.doi.org/10.2219/rtriqr.41.169.

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16

Galeotti, G., and P. Toni. "Overhead contact line elasticity optimization for railway high speed running." Computers & Structures 65, no. 6 (December 1997): 975–83. http://dx.doi.org/10.1016/s0045-7949(95)00189-1.

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17

Mitsuo, Aboshi. "Precise measurement and estimation method for overhead contact line unevenness." Electrical Engineering in Japan 160, no. 2 (2007): 77–85. http://dx.doi.org/10.1002/eej.20209.

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18

Badjor, Mikhail, Elena Semenova, and Andrey Kulikov. "Measures to protect overhead lines from ac contact network." Energy Systems 7, no. 1 (December 20, 2022): 38–45. http://dx.doi.org/10.34031/es.2022.1.004.

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Rail transport together represents energy systems of enormous proportions. An important step in maintaining the correct performance of such a system is the acquisition and preservation of electrical parameters. The main operational problems appear at the moment of maintaining these parameters within acceptable limits. One of these are the linear electrical parameters of overhead lines that run along the contact network of the AC railway. The problem is the phase imbalance in both the capacitive and inductive components. The capacitive component is the interaction between the contact network and the longitudinal power supply system. The inductive component, in turn, is the resistance of the system itself An unnecessary electric and magnetic field will be induced from the contact network to the overhead line, which is a negative electromagnetic effect. The induced voltage on phases A, B and C will be different, hence the different parameters. An important task is not to correct the consequences of influence, but to exclude the appearance of this influence altogether. The authors propose a transposition of overhead line wires with a six-step installation method to align the linear electrical parameters of the line, which is under the influence of the AC contact network. Since modern installation does not allow to achieve the required accuracy, a wire transposition installation device should also be used. As a result of the uniform tension of the wires of the three-phase overhead line system, all phase wires will be constantly equidistant from the contact wire and the negative electromagnetic effect will be constantly balanced and tend to zero.

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19

조용현 and 이기원. "Evaluation of Mechanical Fatigue Life for Droppers of 400km/h Overhead Contact Line." Journal of the Korean Society of Mechanical Technology 18, no. 5 (October 2016): 665–73. http://dx.doi.org/10.17958/ksmt.18.5.201610.665.

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20

ABOSHI, Mitsuo, Shunichi KUSUMI, and Takuya KURAOKA. "457 Diagnosis Method of Overhead Contact Line Stress based on Contact Force of Pantograph." Proceedings of the Dynamics & Design Conference 2010 (2010): _457–1_—_457–6_. http://dx.doi.org/10.1299/jsmedmc.2010._457-1_.

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21

Mei, Guiming, and Yang Song. "Effect of Overhead Contact Line Pre-Sag on the Interaction Performance with a Pantograph in Electrified Railways." Energies 15, no. 19 (September 20, 2022): 6875. http://dx.doi.org/10.3390/en15196875.

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In the high-speed rail industry, the overhead contact line erected along the railroad is used to supply the electricity to the high-speed train via a pantograph on the carbody’s roof. This work attempts to explore the effect of contact line pre-sag on the contact quality between the pantograph and the contact line. A nonlinear finite element approach is implemented to build the overhead contact line system with accurate description of the pre-sag of the contact line. Through a nonlinear solution, the effect of contact line pre-sag on the contact force is analysed with different train speeds and tension classes. The analysis result indicates the feasibility of tuning the pre-sag to improve the interaction performance at a given speed and tension class. In the low-speed range, the change of pre-sag does not have a significant effect on the interaction performance. However, when the speed increases up to a certain value, the effect of pre-sag on the contact force is nonnegligible. The increase in tension can reduce the sensitivity of the interaction performance to the pre-sag. An optimisation procedure is implemented to obtain the optimal amount of pre-sag for different train speeds and tension classes. The results indicate a necessity to include a certain amount of contact line pre-sag to maintain an excellent interaction performance at high speed.

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22

Kuznetsov, Valeriy, Artur Rojek, Petro Hubskyi, Marek Skrzyniarz, Piotr Stypułkowski, and Waldemar Szulc. "Simulation of Current Distribution Through Elements of the Overhead Contact Line." Journal of KONBiN 52, no. 4 (December 1, 2022): 197–206. http://dx.doi.org/10.2478/jok-2022-0050.

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Abstract The compilation of unfavourable weather conditions, such as negative temperature and high humidity, leads to the formation of an ice layer and deposits on the elements of the overhead contact line, which leads to its degradation and prevents the supply of electricity to the traction vehicle. The traction line is located on a very large area and it is extremely difficult to effectively remove the remaining layers of ice. During planning the anti-icing measures it’s very important to know the current distribution in wires. The authors of the article analysed the catenaries operated in Poland and in EU in terms of the current distributions in contact and catenary wires in through spans. The approach presented in this paper allows to take into account the wear of the contact wires during calculations of the current distributions.

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23

Aboshi, Mitsuo, and Mizuki Tsunemoto. "Guidelines for Installing Overhead Contact Line for High-Speed Shinkansen Operation." IEEJ Transactions on Industry Applications 131, no. 6 (2011): 837–43. http://dx.doi.org/10.1541/ieejias.131.837.

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24

Homce, G. T., J. C. Cawley, H. K. Sacks, and M. R. Yenchek. "Development of an overhead power line contact alarm for mobile equipment." International Journal of Heavy Vehicle Systems 12, no. 2 (2005): 87. http://dx.doi.org/10.1504/ijhvs.2005.006377.

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25

Cho, Chul Jin, and Young Park. "New Monitoring Technologies for Overhead Contact Line at 400 km·h −1." Engineering 2, no. 3 (September 2016): 360–65. http://dx.doi.org/10.1016/j.eng.2016.03.016.

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26

SHIMIZU, Masatoshi, Takehiro KOBAYASHI, and Akinori OYA. "Development of Transition Structures between Overhead Rigid Conductor Line and Catenary-Type Contact Line." Quarterly Report of RTRI 49, no. 2 (2008): 103–7. http://dx.doi.org/10.2219/rtriqr.49.103.

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27

Hołyszko, Piotr, Dariusz Zieliński, Andrzej Niewczas, Joanna Rymarz, and Ewa Dębicka. "Ensuring the Continuity of Power Supply to the On-Board Auxiliary Devices of the Trolleybus through the Recuperation of Kinetic Energy." Energies 14, no. 16 (August 17, 2021): 5035. http://dx.doi.org/10.3390/en14165035.

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When a trolleybus travels through insulated sections of the overhead contact line, it experiences momentary power interruptions, which adversely affect the vehicle’s on-board auxiliary subassemblies. To reduce these negative effects, one can harness energy recovered via regenerative braking. A model power supply circuit diagram for structural systems of the trolleybus is proposed. Simulation tests were carried out to develop a method for analyzing power supply to trolleybus auxiliary devices and verify it in a real-life example. The results allow determination of the limit power that can be generated by the trolleybus drive system to feed auxiliary devices during interruptions in power supply from the overhead contact line. The possibility of powering the on-board auxiliary equipment of a trolleybus using energy from recuperation with a traction motor is presented.

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28

Che, Junsoo, Taehun Kim, Suhan Pyo, Jaedeok Park, Byeonghyeon An, and Taesik Park. "Prevention of Wildfires Using an AI-Based Open Conductor Fault Detection Method on Overhead Line." Energies 16, no. 5 (March 1, 2023): 2366. http://dx.doi.org/10.3390/en16052366.

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Overhead lines that are exposed to the outdoors are susceptible to faults such as open conductors on weak points and disconnection caused by external factors such as typhoons. Arcs that occur during disconnection generate energy at a high heat of over 10,000 °C, requiring swift fault shut-off. However, most conventional fault detection methods to protect electrical power systems detect an overcurrent; thus, they can only detect faults after the line is disconnected and the cross-section of the line that generates the arc discharge makes contact with another line or the ground, causing a high risk of fire. Furthermore, in the case of ground faults owing to the disconnection of overhead lines, the load and the grounding impedance are not parallel. Therefore, in the case of the fault current not exceeding the threshold or a high impedance fault due to the high grounding impedance of the surrounding environment, such as grass or trees, it is difficult to determine overhead line faults with conventional fault detection methods. To solve these issues, this paper proposes an AI-based open conductor fault detection method on overhead lines that can clear the fault before the falling open conductor line comes into contact with the ground’s surface so as to prevent fire. The falling time according to the height and span of the overhead line was calculated using a falling conductor model for the overhead line, to which the pendulum motion was applied. The optimal input data cycle that enables fault detection before a line–ground fault occurs was derived. For artificial intelligence learning to prevent wildfires, the voltage and current signals were collected through a total of 432 fault simulations and were wavelet-transformed with a deep neural network to verify the method. The proposed total scheme was simulated and verified with MATLAB.

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29

Song, Yang, and Fuchuan Duan. "Performance assessment of pantograph and overhead system based on a vertical coupling dynamics model of the railway system." Complex Engineering Systems 2, no. 2 (2022): 9. http://dx.doi.org/10.20517/ces.2022.09.

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The increase of train speed leads to a violent vibration of the pantograph and overhead system. To evaluate the interaction performance of the pantograph and overhead system, a whole railway dynamics model including the track, vehicle, pantograph, and overhead system is established. The overhead system is represented by the finite element approach using the analytical formulas of nonlinear cable and truss elements. The vehicle is modeled by a multi-rigid-body system with a pantograph installed on its roof. A beam element with elastic foundations is used to model the track, which possesses harmonic and random irregularities. An iterative algorithm is implemented to solve the nonlinear behavior of the coupling model. The nonlinearities in the deformation of overhead system, the contact of the pantograph and contact line, and the contact of the vehicle-track are properly considered. Several numerical simulations are implemented to systematically investigate the influence of the vehicle-track vibration on the dynamic behavior of pantograph and overhead system. The results indicate that the vehicle-track vibration induced by the rail irregularities with large amplitude or certain wavelength can significantly aggravate the interaction performance of pantograph and overhead system.

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30

Garan, Shumpei, Kohji Ajiki, Yoshifumi Mochinaga, Takahisa Hayashi, and Yoshikatsu Shiraishi. "Salt Pollution on the Overhead Contact Line Insulators at Honshu-Shikoku Bridge." IEEJ Transactions on Power and Energy 114, no. 4 (1994): 335–42. http://dx.doi.org/10.1541/ieejpes1990.114.4_335.

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31

TSUNEMOTO, Mizuki, Yoshitaka YAMASHITA, Yuichi KONDO, Takehiro KOBAYASHI, Shuhei SATO, and Kunio IKEDA. "Current Collection Performance of Overhead Contact Line with Aseismic Pull-off Arm." Proceedings of the Transportation and Logistics Conference 2021.30 (2021): SS2–3–4. http://dx.doi.org/10.1299/jsmetld.2021.30.ss2-3-4.

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32

Kobayasi, Teruo, Yosihiro Fujihasi, Tetsuo Tsuburaya, Jyun-ihi Satoh, Yasu Oura, and Yasukazu Fujii. "Current Collecting Performance of Overhead Contact Line-Pantograph System at 425km/h." IEEJ Transactions on Industry Applications 117, no. 5 (1997): 609–15. http://dx.doi.org/10.1541/ieejias.117.609.

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33

Shilin, Alexandr, Alexey Shilin, Sergey Dementyev, and Nadezhda Kuznetsova. "Device for contactless ice buildup monitoring of overhead power line wires." Energy Safety and Energy Economy 3 (June 2021): 5–11. http://dx.doi.org/10.18635/2071-2219-2021-3-5-11.

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Ice buildup monitoring is essential to prevent wire breakage on overhead power lines. Conventional telemetry systems which are based on load cell sensors have some drawbacks as reflected in this paper. We suggest an innovative device for contactless ice buildup monitoring of overhead power line wires video recording the power line clearance. A specific algorithm for detecting the lowest point of wire sag has been provided. Also, we analyze a possibility of indirect contact sensor-free measurements of a wire temperature when the wire is being covered by icy deposits. A specific buildup type can be determined comparing a dew point and desublimation point as shown in this paper.

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34

Huang, Zhidu, Shan Li, Yubin Feng, Jie Tang, Wei Zhang, Zhimei Cui, Rongrong Wu, Jianna Ouyang, and Lu Oyang. "Research on Fault Location Technology of Overhead Line Based on Non-Contact High Sensitivity Distributed Traveling Wave." Journal of Nanoelectronics and Optoelectronics 17, no. 9 (September 1, 2022): 1238–44. http://dx.doi.org/10.1166/jno.2022.3319.

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Aiming at the characteristics of overhead transmission line faults and starting from the research of the fault transient current and features of traveling wave signals of the grounded transmission tower when fault occurs, this paper analyzes non-contact distributed methods of acquiring fault traveling wave signals and then puts forward one. The transient traveling wave signal designed at the earth potential terminal of the transmission line tower allows the quick and accurate acquisition of the fault signal, improving the reliability and accuracy of the fault signal. At the same time, a series of simulation and experimental analysis were carried out. The distributed non-contact fault location method is more flexible than the traditional method and can be used in the field application of overhead transmission lines to improve the fault location accuracy and search efficiency.

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35

Na, Kyung-Min, Kiwon Lee, Hyungchul Kim, Chul Jin Cho, Wonseok Choi, and Young Park. "Implementation of Image Processing in Studying Contact Conditions of Overhead Contact Line-Pantograph at 400 km/h." Journal of Electrical Engineering & Technology 15, no. 2 (February 17, 2020): 989–95. http://dx.doi.org/10.1007/s42835-020-00363-3.

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36

Blanco, Blas, Itxaro Errandonea, Sergio Beltrán, Saioa Arrizabalaga, and Unai Alvarado. "Panhead accelerations-based methodology for monitoring the stagger in overhead contact line systems." Mechanism and Machine Theory 171 (May 2022): 104742. http://dx.doi.org/10.1016/j.mechmachtheory.2022.104742.

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37

Park, Young, Kiwon Lee, Chulmin Park, and Sam-Young Kwon. "Implementation of Optimization of the Uplift Amount Measurement System of Overhead Contact Line." Transactions of The Korean Institute of Electrical Engineers 62, no. 6 (June 1, 2013): 886–90. http://dx.doi.org/10.5370/kiee.2013.62.6.886.

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38

Zorita, A. L., O. Duque, M. A. Fernández, and L. A. García-Escudero. "Determination and Optimization of the Maintenance Frequencies in the Overhead Contact Line System." Journal of Transportation Engineering 136, no. 11 (November 2010): 964–72. http://dx.doi.org/10.1061/(asce)te.1943-5436.0000166.

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39

Kobayasi, Teruo, Yosihiro Fujihasi, Tetsuo Tsuburaya, Jyun-ihi Satoh, Yasu Oura, and Yasukazu Fujii. "Current collecting performance of overhead contact line-pantograph system at 425 km/h." Electrical Engineering in Japan 124, no. 3 (1998): 73–81. http://dx.doi.org/10.1002/(sici)1520-6416(199808)124:3<73::aid-eej9>3.0.co;2-j.

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40

Zhang, Hong Wei. "Research on Electromagnetic Interference of Wiring Motor Vehicle in Coal Mine Tunnel." Advanced Materials Research 912-914 (April 2014): 998–1001. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.998.

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Contact net of motor vehicle in coal mine tunnel is a powerful industrial disturbance source, pulse interference generated by contact net is some pulse group with random, repetitive amplitude and duration. When the train is in the rated working current situation, the pantograph and overhead line is in the process of separation to contact, the motor vehicle running speed is lower, the discharge current is larger, the more arc radiation interference.

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41

Karwowski, Krzysztof, Mirosław Mizan, and Dariusz Karkosiński. "Monitoring of current collectors on the railway line." Transport 33, no. 1 (February 29, 2016): 177–85. http://dx.doi.org/10.3846/16484142.2016.1144222.

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Proper cooperation the current collectors and the overhead line is a pre-requisite for reliable and safe operation of railway transport. Instances of maladjustment and, in some cases, damage to the current collectors, occur between periodic inspections of the rolling stock. In order to detect such anomalies quickly, the test stand was developed, with the aim of monitoring the technical state of the current collectors under operating conditions. The detection procedure is based on the monitoring and analysis of contact wire uplift caused by the pressure of the current collector, as the train passes through the measuring point located on the railway line and is designed with the aim of detecting collectors with incorrect values of a contact force.

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42

Barmada, S., A. Landi, M. Papi, and L. Sani. "Wavelet multiresolution analysis for monitoring the occurrence of arcing on overhead electrified railways." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 217, no. 3 (May 1, 2003): 177–87. http://dx.doi.org/10.1243/095440903769012885.

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A crucial problem for railway companies is the detection of the critical points of the overhead line for predicting excessive wear of the contact wire and for helping maintenance activities. An innovative tool, based on wavelet multiresolution analysis, is proposed in this paper for on-line monitoring of the quality of current collection. Wavelet decomposition of data collected from different measurement systems (e.g. total traction line current or signals acquired from unconventional sensors) can perform an automatic analysis of the data collected and can detect a singular occurrence of arcing due to loss of contact of the pantograph. A relevant outcome of such an analysis is the evaluation of a quantitative index for checking the quality of the current collection via an integral analysis of the multiresolution signal decomposition. Examples of analysis from experimental data are reported in the paper.

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Galkin, Aleksandr G., Andrey V. Bunzya, and Dmitrij V. Lesnikov. "The use of a high-power electronic switch in the deicing on the overhead line network using the pulse-resonance method." Innotrans, no. 1 (2020): 56–59. http://dx.doi.org/10.20291/2311-164x-2020-1-56-59.

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The possibility of technical implementation for deicing of double contact wires by pulse-resonance method using a high-power electronic switch is evaluated. For a specific double-track road section of overhead line network, the parameters of the necessary step-down transformer operating in pulse mode and providing heating of the contact wires to positive temperatures are calculated. A possible range of changes in the current density of the contact wires, controlled by the relative pulse duration, is determined.

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44

Collina, A., F. Fossati, M. Papi, and F. Resta. "Impact of overhead line irregularity on current collection and diagnostics based on the measurement of pantograph dynamics." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 221, no. 4 (July 1, 2007): 547–59. http://dx.doi.org/10.1243/09544097f02105.

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As train speed increases, contact wire irregularity affects the quality of current collection more and more. The possibility of achieving the maximum operating speed depends also on the maintenance level of the overhead line (OHL). In the present paper, the influence of contact wire irregularity (in terms of vertical deviation of its position) is investigated both experimentally and by means of numerical simulation of the dynamic interaction of pantograph and catenary. In a first step, the capability of the simulation to reproduce the effect of a singularity in the contact wire height along the line has been tested by comparison with available experimental results. The same model has been subsequently used to perform numerical experiments concerning the effects of several types of distributed defects on the catenary. Afterwards, considering the data generated with the simulation as experimental data, a procedure to find the signature in terms of the contact force of the considered distributed defects on the OHL has been proposed. In this procedure, the contact force is not measured, but estimated from the motion of the pantograph, by means of an application of the extended Kalman filter. The adoption of an estimation procedure for the contact force, instead of a direct measurement, would allow the installation of a measurement system that is much simpler than the one required for the direct measurement of contact force. For this feature, it could be installed, at least in principle, on ordinary trains, allowing to perform an extensive monitoring and diagnostic activity with a large database.

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HAMADA, Takahiro, and Atsushi IWAINAKA. "Development of Feeder Messenger Wire Type Overhead Contact Line with One Copper Messenger Wire." Quarterly Report of RTRI 44, no. 2 (2003): 82–85. http://dx.doi.org/10.2219/rtriqr.44.82.

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Cho, Yong Hyeon, Kiwon Lee, Sam Young Kwon, and Ho Rung Cho. "Development of a Tensioning Device for the 400km/h High-speed Overhead Contact Line." Transactions of The Korean Institute of Electrical Engineers 64, no. 12 (December 1, 2015): 1789–95. http://dx.doi.org/10.5370/kiee.2015.64.12.1789.

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Collina, A., A. Facchinetti, F. Fossati, and F. Resta. "Hardware in the Loop Test-Rig for Identification and Control Application on High Speed Pantographs." Shock and Vibration 11, no. 3-4 (2004): 445–56. http://dx.doi.org/10.1155/2004/740146.

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Trains current collection for traction motors is obtained by means of a sliding contact between the overhead line (OHL) and the collector strips mounted on the pantograph head. The normal force by which the collector presses against the contact wire ensures the contact pressure for the electrical contact. As the train speed increases, the variation of contact force between pantograph and catenary increases, and the pantograph-OHL dynamic interaction becomes greater. This condition causes excessive mechanical wear and contact wire uplift (for high values of contact forces), and leads to high percentage of contact loss, arcing and electrically related wear.The topic of actively controlled pantograph is gaining more interest as a tool to increase the performance of the current collection at high speed. In the last few years, it appears possible to transfer the knowledge based on numerical experiments, to the real operating condition. An important step in this direction is the set up of a laboratory hardware in the loop test-rig in which the control strategies and the actuation can be tested, before tests performing in real life conditions, in order to demonstrate their actual feasibility. The present paper describes an hardware in the loop (HIL) test-rig developed by the authors, which allows to reproduce the dynamical interaction between overhead lines and pantograph in high speed railways. Using the described laboratory set-up, experimental investigation on the problems related with pantograph-OHL interaction can be performed, very similarly to the real life operating conditions, with the advantage of varying test parameters and conditions easily.

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Na, Kyung-min, Young Park, Kiwon Lee, Yong Hyeon Cho, Sam-young Kwon, and Chulmin Park. "Analysis of Current Collect Performance Depending on Installation Condition of Overhead Contact Line in Suseo High Speed Line." Transactions of The Korean Institute of Electrical Engineers 66, no. 4 (April 1, 2017): 727–32. http://dx.doi.org/10.5370/kiee.2017.66.4.727.

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49

Pereverzyev, K., V. Vasenko, and G. Domanska. "The technology of a condition based maintenance of an overhead contact line with Markov approximation of contact wire wear." Lighting engineering and power engineering 1, no. 57 (April 6, 2020): 3–8. http://dx.doi.org/10.33042/2079-424x-2020-1-57-3-8.

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The technologies of OCL condition based maintenance were improved for providing reliable and economic current collecting on electrified railways and in traction power networks of urban electric transport. It is established that one of the most perspective methods of reducing operating costs is the transition to scientifically justified terms of repair and planning of works based on the actual state of OCL, the reliability of which is determined by the reliability, repair suitability and durability of the elements. The basic criteria of the current collecting process are proposed: the value of contacting pair wear, the detachment of the current collectors from the wires, the scope of oscillations of pantograph head and the contact pressure, coefficients of contact unreliability and cost savings of collecting a power from catenary, and, finally, a minimum of annual operating costs. Technology of maintenance according to Markov type parameter control is developed. Models of controlling actions on stagger and the contact wire gradient adjustment processes are developed. The standard linear programming algorithm was used to solve the problem. The application of such technology to determine the matrix of controlling actions based on the results of monitoring the stagger and the contact wire gradient is shown. The factors that determine the cost of staying in a state of stagger have been identified. The controlling actions matrices on the stagger and the contact wire gradient and the cost of staying in these gradient states are established. The technology of service with Markov approximation of wear of contact wires is offered. It has been investigated that the contact wires, primarily due to wear, are degraded during operation. Degradation processes cause gradual failures. The first group of failures: breakages, burnouts, local wear - require controlling actions to incut the insertion or putting into operation a shunt. The second group: a burnout, a decrease in the average cross-section of a wire less than the allowable one requires controlling actions to replace the wire of the entire tension length. After conducting the first type of controlling actions, the contact wire returns to the working state with the previous value of the determining parameter. When performing a second type of controlling actions, the defining parameter returns to its original state. If the quantification step is chosen such that the intensities of failures and transitions from one state to another with a sufficient degree of accuracy were constant, then the graph of states and transitions, as well as the Kolmogorov differential equations, can be used for the research. The readiness function, the density of time distribution of infallible operation, the total failure rate, and the average recovery rate from state S0i to Si are determined. Thus, all reliability indicators are defined and it is possible to use them in determining the condition of the contact wire of the tension length. Experience has shown that the most effective diagnostics of the condition of OCL devices combines the assessment of the state on mathematical, simulation models and measurements with the use of car laboratories for testing the contact network and devices for monitoring the parameters of the contact wire for the railcar. Key words –overhead contact line,contact wire, mainanance technology, controlling action models.

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Na, Kyung-Min, Kiwon Lee, Hyungchul Kim, Chul Jin Cho, Wonseok Choi, and Young Park. "Correction to: Implementation of Image Processing in Studying Contact Conditions of Overhead Contact Line-Pantograph at 400 km/h." Journal of Electrical Engineering & Technology 15, no. 3 (March 18, 2020): 1483. http://dx.doi.org/10.1007/s42835-020-00409-6.

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