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Influence of Discrete Series Devices on Crosstalk Phenomena in Multiconductor Transmission Lines
Division for electricity and lightning research, Uppsala University.
Division for electricity and lightning research, Uppsala University.
Division for electricity and lightning research, Uppsala University.ORCID iD: 0000-0002-1607-2493
2007 (English)In: EMC ZURICH-MUNICH 2007, SYMPOSIUM DIGEST, 2007, 245-248 p.Conference paper (Refereed)
Abstract [en]

Usually the crosstalk mechanisms in multiconductor transmission lines (MTL) are studied considering lumped loads or devices connected at the line terminations (either at source or load ends) or as shunt load to ground along the lines, as seen in conventional power and railway system networks. However there are practical systems, e.g. like in typical Swedish railway systems, wherein discrete lumped devices like the booster transformer (BT) exist in series with the line. With lightning transients various parameters that influence crosstalk in MTL systems, such as the ground conductivity, have been analyzed e.g. in [1]. For realistic crosstalk analysis we conclude that inclusion of discrete devices like BT should be accounted. The study could be beneficial in better understanding of the crosstalk mechanism in the electrified railway systems.

Place, publisher, year, edition, pages
2007. 245-248 p.
National Category
URN: urn:nbn:se:kth:diva-11938DOI: 10.1109/EMCZUR.2007.4388241ISI: 000253707800061OAI: diva2:290574
18th International Zurich Symposium on Electromagnetic Compatibility Location: Lab Electromagnet Field & Microwave Elect. Munich, GERMANY. SEP 24-28, 2007
QC 20111117Available from: 2010-02-01 Created: 2010-01-27 Last updated: 2011-11-17Bibliographically approved
In thesis
1. Multi-conductor transmission line model for electrified railways: A method for including responses of lumped devices
Open this publication in new window or tab >>Multi-conductor transmission line model for electrified railways: A method for including responses of lumped devices
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For studying the response to transients caused by lightning and other electromagnetic disturbance sources, electrified railway systems can be represented as a system of multiconductor transmission lines (MTL) above a finitely conducting ground. The conductors present in this system would be wires for traction power supply, auxiliary power, return conductors for traction current, the tracks, and finitely conducting ground. In contrast to conventional power systems, where the MTL system is usually only terminated at the line ends, there are lumped devices connected in series and as shunt along the railway network, for example, booster and auto transformers, track circuits, and various interconnections between conductors, influencing surge propagation. In this doctorial thesis a new method for incorporating lumped series and shunt connected devices along MTL systems is presented. Telegrapher’s equations, using the finite difference time domain method, are adopted for finding surge pulse propagations along the MTL systems, simultaneously solving for the lumped devices connected along the lines by means of Kirchoff’s laws for nodal currents and voltages using a circuit solver.

As part of this work, case studies are carried out to determine voltages appearing across devices connected along MTL systems representative of a typical Swedish single-track electrified railway system, in cases of direct and indirect lightning strikes. The influence of soil ionization at the grounding points and the nonlinear phenomenon of flashovers between overhead wires and the poles are also investigated. The calculations made show that the devices connected along this system, which are needed for normal and safe operation of the railway system, and nonlinearities are affecting the surge current and voltage distribution and peaks appearing along the MTL system and across devices.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. x, 80 p.
Trita-EE, ISSN 1653-5146 ; 2010:006
urn:nbn:se:kth:diva-11964 (URN)978-91-7415-557-0 (ISBN)
Public defence
2010-02-24, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Available from: 2010-02-01 Created: 2010-02-01 Last updated: 2012-03-26

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Mazloom, ZiyaThottappillil, Rajeev

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