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Готові списки джерел за темами / 25 KV AC

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Добірка наукової літератури з теми "25 KV AC"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "25 KV AC"

1

Monjo, Lluís, and Luis Sainz. "Study of Resonances in 1 × 25 kV AC Traction Systems." Electric Power Components and Systems 43, no. 15 (August 5, 2015): 1771–80. http://dx.doi.org/10.1080/15325008.2015.1048908.

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2

Zalesova, O. V. "Determination of Electromagnetic Influence of 25 kV AC Electric Traction Network on 10 kV High-Voltage Overhead Line." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012078. http://dx.doi.org/10.1088/1742-6596/2096/1/012078.

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Анотація:

Abstract Electrified railways include a system of cable and overhead lines. An analysis of the operation of alternating current (AC) electrified railways sections shows that the value of the induced voltage caused by the operation of the traction network can significantly exceed the permissible level on adjacent disconnected high-voltage overhead lines. As a consequence, this leads to serious injuries to operating personnel, including deaths, failure of electrical equipment. From this point of view, 1x25 kV 50 Hz AC railway system networks are considered the most dangerous. The electromagnetic influence of the traction network of a double-track section of an AC railway on an adjacent 10 kV high-voltage overhead line for power supply of automatic block signalling is investigated in the offered paper. Emergency cases of traction network operation are considered: short-circuit situation and forced state. The calculations of short-circuit currents in the influencing inter-substation zone, as well as estimation of the induced voltage on the wires of the 10 kV disconnected high-voltage overhead line for various schemes of grounding, have been performed. The investigations were carried out on models built using the ATP-EMTP program.

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3

Pawlik, Marek. "Comprehensive approach to risk assessment and evaluation regarding constructioning of the first 25 kV 50 Hz AC traction power supply sections in Poland." MATEC Web of Conferences 180 (2018): 06002. http://dx.doi.org/10.1051/matecconf/201818006002.

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Railway lines in Poland are either equipped with 3 kV DC traction system or not electrified for traction purpose. Presently maximum line speed is 200 km/h while maximum train speed is 250 km/h. Speeding up limit for 3 kV DC traction is estimated to be around 220-230 km/h. Already present in Poland trains for 250 km/h are equipped with three electric power supply systems: 3 kV DC used in Poland, 15 kV 16,7 Hz AC used in Germany, and 25 kV 50 Hz AC foreseen to be used in Poland on high speed lines. Introducing 25 kV 50 Hz AC traction power supply will be associated with safety challenges, which have to be taken into account already during constructioning, starting even at the predesigned phase. Two key questions arise. First of all question regarding methodology, which should be used for safety level acceptance and secondly how to ensure that all safety aspects will be taken into account. Answering first question for railway safety experts seems to be easy – let’s apply risk assessment and evaluation methodology described by EU regulation under Railway Safety Directive. The challenge is however to define risk acceptance criteria which will be required, and that is analysed in the paper. The second challenge is even more challenging. Author proposes using 10-by-10 safety matrix which was defined by the author in previous publications [9, 10]. Its concept as well as principles for its application for new type of power supply is also presented in the paper.

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4

Cheung, Henry. "The Immunity of a Signal System under 25 kV AC Traction." HKIE Transactions 13, no. 1 (January 2006): 2–6. http://dx.doi.org/10.1080/1023697x.2006.10668023.

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5

Bielech, Joanna. "Modelowanie zwarć w układach zasilania trakcji kolejowej 2�25 kV AC." WIADOMOŚCI ELEKTROTECHNICZNE 1, no. 1 (January 5, 2019): 27–28. http://dx.doi.org/10.15199/74.2019.1.3.

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6

Ignatenko, Ivan, Sergey Vlasenko, Evgeniy Tryapkin, and Vladimir Kovalev. "Algorithm for calculating the rail-ground potential in heavy load conditions." E3S Web of Conferences 284 (2021): 06002. http://dx.doi.org/10.1051/e3sconf/202128406002.

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Increased freight turnover on railway transport inevitably leads to increased traction current in DC and AC traction power supply systems. The increase in traction current is already causing problems related to the normal operation of the 25 kV AC traction power supply systems. One of the adverse consequences of the increased traction currents is the increased rail-to-ground potential. This has already caused a number of accidents and related traffic interruptions on the Far Eastern Railway of Russia and other railway sections powered with alternating current. The study considers the problem of increased rail-to-ground potentials and provides basic formulae for calculating the wave parameters of the rail network and rail-to-ground potentials. Various methods are given for calculating rail-to-ground potentials for a 25 kV AC traction power supply system. Since in an alternating current system, expressions for calculating the potential are functions of a complex variable, the calculation of such expressions requires the use of special programs. Adaptation of existing methods to modern software and computing systems allows you to optimize and significantly speed up the process of calculating the “rail-to-ground” potentials, either considering the use of certain potential-reducing measures or not. A calculation method includes an algorithm developed for calculating the rail-to-ground potentials in the 25 kV AC traction power supply system for an inter-substation zone of any length with any number of electric locomotives within the zone.

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7

Dehcheshmeh, Mehdi Amiri, Seyed Hossein Hosseinian, Mohammad Hossein Bigharaz, and Kazem Mohseni. "Analysis of lightning transient in 2 × 25 kV AC autotransformer traction system." International Journal of Power and Energy Conversion 9, no. 1 (2018): 89. http://dx.doi.org/10.1504/ijpec.2018.088268.

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8

Mohseni, Kazem, Mohammad Hossein Bigharaz, Mehdi Amiri Dehcheshmeh, and Seyed Hossein Hosseinian. "Analysis of lightning transient in 2 × 25 kV AC autotransformer traction system." International Journal of Power and Energy Conversion 9, no. 1 (2018): 89. http://dx.doi.org/10.1504/ijpec.2018.10008084.

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9

Nezevak, V. L. "Comparison of energy parameters of electric storage systems for DC and AC traction power supply systems." Russian Railway Science 81, no. 1 (March 29, 2022): 38–52. http://dx.doi.org/10.21780/2223-9731-2022-81-1-38-52.

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Анотація:

Introduction. The article discusses the energy parameters of electric power storage systems for DC and AC traction power supply systems. The purpose of the research is to evaluate the energy parameters of electric power storage systems located within the inter-substation zone boundaries of the AC traction power supply system at the 25 kV voltage.Materials and methods. The author used the methods of modeling, statistics and the experimental results processing. Moreover, the paper presented the parameter estimation of the energy accumulation system on the basis of the traction calculations for the AC rolling stock. In addition, the author made two variants of calculations — in the presence and the absence of the electric storage system. The researcher also made the simulation of the electric storage system for the voltage source connected to the sectioning post busbars.Results. Using the simulation modeling, the author presents active and reactive power graphs of the inter-substation zone boundaries in the active sectioning post operation conditions. Therefore, the article demonstrates the graph of the expected charge, the discharge depth calculations for the nominal energy capacity and the required charging features, which guarantee the charge restoration of the accumulation system to the initial level.Discussion and conclusion. The author offers the comparative assessment of the electric storage systems for the traction power supply with the DС voltage of 3 kV and the AC voltage of 25 kV. The research demonstrates the reducing potential of the nominal accumulation parameters.

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10

Konishi, Masayoshi, Teruhisa Nagashima, and Yoshinobu Asako. "ER Properties of a Suspension of Polymer Graft Carbon Black Particles." International Journal of Modern Physics B 13, no. 14n16 (June 30, 1999): 1682–88. http://dx.doi.org/10.1142/s0217979299001673.

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We newly developed ER particles with sub-micron size. The particle was polymer graft carbon black (GCB1) composed of carbon black particles and a polymer. The average particle size of GCB1 was found to be 81 nm. An ER suspension (ER1) was obtained by mixing GCB1 (30 wt%) with silicone oil (70 wt%). The ER1 showed excellent dispersion stability. Further, GCB1 particles did not settle under centrifuging at 9000G. The zero-field viscosity was 80 mPa·s at 25°C. The kinetic friction coefficient of ER1 was 0.15, while that of the silicone oil used was 0.23. When the electric field of 3 kV/mm (AC 1000 Hz) at the temperature of 25°C and the shear rate of 700 s -1 was applied to ER1, the shear stress of 116Pa was induced. The induced shear stress did not change for a long period of time period. In the temperature range between 25 and 150°C the induced shear stress and the current density were almost constant at any electric field. When 3 kV/mm (AC 50Hz) at 25°C and 700s-1 was applied to ER1, the shear stress of 88Pa was induced but the deviation of the induced shear stress from the average value was pluses and minuses 3 Pa.

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Більше джерел

Дисертації з теми "25 KV AC"

1

Lehmann, Michael [Verfasser]. "Grundlagen und Anforderungen an die Teilsysteme elektrischer Bahnen bei Nennspannungen über 25 kV AC und 3 kV DC / Michael Lehmann." Aachen : Shaker, 2010. http://d-nb.info/1081887133/34.

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2

Lowinsky, Luc Anthony. "Nouvelle topologie de Compensateur de Puissance Réactive pour les Réseaux Ferrés 25 kV / 50 Hz." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0036/document.

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Le travail présenté dans ce mémoire s’est déroulé dans le cadre d’une collaboration entre le groupe Convertisseur Statique du laboratoire LAPLACE et le département " Installations Fixes de Traction Electrique " de la Direction de l’Ingénierie de la SNCF. Aujourd'hui, la majorité du trafic sur le réseau ferré monophasé 25 kV / 50 Hz est assurée par des locomotives équipées de redresseurs contrôlés à thyristors. Du fait de l'augmentation du trafic, l'utilisation de ces locomotives nécessite la mise en place de moyen de compensation de puissance réactive afin de maintenir la tension caténaire à un niveau acceptable et de réduire la facture en énergie réactive. La correction du facteur de déplacement est réalisée en partie par des batteries de compensation fixes dont lapuissance est limitée par la tension maximale admissible à vide sur la caténaire. Afin d’adapter le niveau de compensation à la consommation, la partie fixe est complétée par un dispositif réglable basé sur une réactance contrôlée par des thyristors. Bien qu’il soit simple dans son principe, ce dispositif nécessite un filtrage des harmoniques en basse fréquence avec des circuits LC volumineux. L’objectif de cette thèse est de proposer une nouvelle topologie de compensateur de puissance réactive à haut rendement et utilisant un contrôle à modulation de largeur d’impulsion dans le but de minimiser le volume des éléments de filtrage. La première partie de ce mémoire est consacrée à une étude comparative de différentes topologies du point de vue des pertes dans les semi-conducteurs et du dimensionnement des éléments de filtrage associés. Les résultats de cette étude montrent que les topologies à base de gradateurs MLI, constituent les solutions les plus intéressantes pour réaliser le compensateur. La deuxième partie du travail concerne l’étude de l’insertion d’un compensateur à base de gradateurs MLI sur le réseau ferré avec la prise en compte des interactions harmoniques. Le cas d’étude concerne une sous-station où doit être implantée une compensation variable de 3 MVAR. Un relevé des courants délivrés par la sous-station a été effectué dans le but d’analyser leur contenu harmonique. Une modélisation de la sous-station et du compensateur est ensuite proposée et des simulations temporelles de l’ensemble sont réalisées en prenant en compte les formes d’ondes réelles des courants absorbés par les trains. Finalement, cette étude par simulation permet d’affiner le dimensionnement du compensateur à gradateurs MLI et des éléments de filtrage associés. Elle met en évidence l’avantage d’une solution, avec des gradateurs MLI en montage élévateur de tension, qui fonctionne sans transformateur et réutilise les batteries de compensation fixes déjà installées en sous-station à la fois comme diviseur de tension et éléments de filtrage. Afin de valider le principe de cette nouvelle topologie de compensateur statique de puissance réactive, un démonstrateur de 1,2 MVAR est mis en oeuvre et testé sur une plateforme d'essai de la SNCF
The work presented in this thesis is the result of collaboration between the Static Converters research group of LAPLACE Laboratory and the department "Installations Fixes de Traction Electrique" of the Engineering Division of the French Railways company, SNCF. Nowadays, most of the traffic in 25 kV – 50 Hz lines is achieved by old locomotives equipped with thyristor rectifiers. As traffic and load increase, reactive power compensation devices are required to keep the overhead line voltage at acceptable level and to reduce the spending for reactive power. The basic power factor correction is completed by fixed compensation banks. But the difficulty of such configuration is the no-load operation of overhead lines. The voltage can increase out of the 29 kV standard limit and to avoid this problem, variable reactive power compensator is often added to the fixed compensation banks. Nowadays, SNCF is equipped with thyristor based static VAR compensators (SVC). The main drawback of this topology is the requirement of a large LC shunt filter tuned for the third harmonic. The goal of this thesis is to find a new high-efficiency topology of STATic COMpensator (STATCOM) using PWM control to minimize the filtering components. The first part of this thesis focuses on a comparative study of different topologies in terms of semiconductor losses and filter elements size. The results of this study show that the topologies based on PWM AC Chopper are the most interesting solutions to achieve the compensator. The second part of the work concerns the influence of the connection of a STATCOM to a substation and focuses on the harmonic interactions with locomotives. The study case concerns a high traffic substation where a 3 MVAR STATCOM should be installed. Substation output current measurement was carried out in order to analyze its harmonic content. Models of the substation and the STATCOM are then proposed and simulations using real current waveforms are performed. Finally, this simulation study helps to refine the features of the AC Chopper topology and its filter elements. It highlights the advantage of a solution, with boost AC Choppers which operate without transformer and reuse the fixed compensation banks already installed in the substation as voltage divider and filter. To validate the principle of this new topology of STATCOM, a 1.2 MVAR prototype is built in LAPLACE laboratory and tested on a SNCF test platform

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3

KUMAR, JITENDER. "INVESTIGATIONS ON POWER SUPPLY AND SCADA SECURITY ISSUES OF 25 KV AC TRACTION SYSTEM." Thesis, 2012. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16083.

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Recently, Need of electrical railways are felt as most preferred mode of public transport because of fossil energy depletion and to prevent global warming due to carbon emission. 25KV AC network is adopted in cities having high traffic or cover long distances. 25 kV AC traction has the economical advantages of less number of traction sub-stations and capacity to carry large traffic and suited for urban cities having passenger capacity of more than a lakh per day. Power supply for 25KV AC traction system is fed to overhead conductors at feeding post location through traction sub-station having 02 transformers in hot/standby configuration. This power supply is used by locomotives with the help of pantograph for current collection. When any problem occurs in the network due to signalling or locomotive failure, there is a tendency of bunching of trains in one feeding section which causes tripping of traction feeder breakers on overcurrent. During such scenario, it should be possible to allow parallel operation of traction transformers with a mechanism to reduce the fault level. Feed from one substation on single phase 25 kV, depending on number of trains and voltage drop, gets limited to 16 to 20 kMs. Therefore, Neutral section is implemented between two different sources to prevent bridging of two different phases. When a train passes through a neutral section, the electrical power supply phase is changed. Before negotiating neutral section, the train must switch off the circuit breaker to avoid transients such as inrush currents and arcs. If train circuit breaker doesn’t open while negotiating healthy section to dead section, there is huge arc due to current break which cause severe damage to overhead components. Also, life of the train circuit breaker owing to its frequent operation is affected. Conventional neutral section has demerits and operational implications which demands to explore new technology to be used in place of neutral section. Fail safe mechanism using Semi-conductor commutated neutral section is analyzed in this report to mitigate these problems when trains pass through the neutral section. An alternate of conventional neutral section and fault level limiter is discussed in this report. Further, SCADA system implemented for control and monitoring of traction system should be well secure to ensure reliable monitoring and safe control of traction devices. Vulnerability assessment of traction system and remedies are discussed in this report. This thesis investigates aspects of semi-conductor based neutral section, Superconducting fault current limiter and its security aspects of SCADA system for a 25KV AC traction system.

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Частини книг з теми "25 KV AC"

1

Gavrilovic, Branislav, and Zoran Bundalo. "The Filter-Compensation Device Applications to the AC 25 kV 50 Hz AC of Serbian Railways." In Lecture Notes in Networks and Systems, 429–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90893-9_51.

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2

Konstantinova, Yuliya, Valerij Li, and Andrey Konstantinov. "Simulation of Devices for Voltage Regulation in 25 kV AC Electric Traction Network." In VIII International Scientific Siberian Transport Forum, 15–24. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37916-2_2.

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3

Doleček, Radovan, Ondřej Černý, Zdeněk Němec, and Jan Pidanič. "The Behavior of the Traction Power Supply System of AC 25 kV 50 Hz During Operation." In Rail Transport—Systems Approach, 35–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51502-1_2.

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Тези доповідей конференцій з теми "25 KV AC"

1

White, R. D. "AC 25 kV 50 Hz electrification supply design." In 4th IET Professional Development Course on Railway Electrification Infrastructure & Systems (REIS). IET, 2009. http://dx.doi.org/10.1049/ic.2009.0009.

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2

White, R. D. "AC 25 kV 50 Hz electrification supply design." In 2nd IEE Residential Course on Railway Electrification Infrastructure Systems. IEE, 2005. http://dx.doi.org/10.1049/ic:20050623.

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3

Dolecek, Radovan, Ondrej Cerny, Vladimir Schejbal, and Mohammd Reza Rezakhah. "The behavior of traction system of AC 25 kV during operation." In 2016 26th International Conference Radioelektronika (RADIOELEKTRONIKA). IEEE, 2016. http://dx.doi.org/10.1109/radioelek.2016.7477415.

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4

McQuillan, D. J. "Development in protection for 25 kV AC electrified lines on British Railways." In 6th International Conference on Developments in Power Systems Protection. IEE, 1997. http://dx.doi.org/10.1049/cp:19970092.

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5

Seferi, Yljon, Paul Clarkson, Steven M. Blair, Andrea Mariscotti, and Brian G. Stewart. "Power Quality Event Analysis in 25 kV 50 Hz AC Railway System Networks." In 2019 IEEE 10th International Workshop on Applied Measurements for Power Systems (AMPS). IEEE, 2019. http://dx.doi.org/10.1109/amps.2019.8897765.

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6

Goh, S. "Earthing and bonding of 2×25 kV AC autotransformer system in twin-tunnels." In IET Conference on Railway Traction Systems (RTS 2010). IET, 2010. http://dx.doi.org/10.1049/ic.2010.0027.

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7

Bhalja, Bhavesh, and R. P. Maheshwari. "High Speed Protection Scheme for Traction OHE of 25 kV AC Indian Railway System." In 2007 IEEE Industry Applications Annual Meeting. IEEE, 2007. http://dx.doi.org/10.1109/07ias.2007.141.

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8

Bhalja, Bhavesh, and R. P. Maheshwari. "High Speed Protection Scheme for Traction OHE of 25 kV AC Indian Railway System." In 2007 IEEE Industry Applications Annual Meeting. IEEE, 2007. http://dx.doi.org/10.1109/ias.2007.141.

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9

Yousefi, Sasan, Mohammad Mahdi Hosseini-Biyouki, Aydin Zaboli, and Hossein Askarian-Abyaneh. "Different hybrid filters configurations impact on an AC 25 kV electric train's harmonic mitigation." In 2015 20th Conference on Electrical Power Distribution Networks Conference (EPDC). IEEE, 2015. http://dx.doi.org/10.1109/epdc.2015.7330511.

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10

Istrate, Daniela, and Dominique Fortune. "Fictive power source for calibrations in railway systems." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201908001.

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Анотація:

The work presented in this paper aims at developing a reference system for laboratory calibration of the Energy Measurement Functions working under AC supply system and actual operating conditions. More precisely, the paper focuses on the design of a fictive power source designed to generate voltage and current waveforms of 15 kV-16.7 Hz and 25 kV-50 Hz, 500 A with harmonics up to 5 kHz.

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