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Blitzeinwirkungen auf Oberleitungs- und Signalanlagen in Schweden
Uppsala University.
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2007 (German)In: Elektrische Bahnen, no 1-2, 67-80 p.Article in journal (Refereed) Published
Abstract [de]

Für ältere elektrotechnische Bahnanlagen waren die Aspekte der elektromagnetischen Verträglichkeit von geringerer Bedeutung als für heutige Anlagen. Vor allem für neuere Signal- und Zugerkennungsanlagen mit kleineren Abmessungen sanken die erlaubten Höchstwerte für Ströme und Spannungen. Dies hat die Störungsempfindlichkeit erhöht. Eine wichtige, wenn nicht die wichtigste Störungsquelle sind atmosphärische Entladungen, also Blitze. Ihre Einwirkung auf elektrifizierte Bahnstrecken in Schweden wurde theoretisch durch Simulationen untersucht. Die Empfindlichkeit der Komponenten wurde experimentell geprüft. Bei Bahnanlagen reicht die Ableitung von Blitzen nicht aus, um Schäden durch Blitzentladungen zu vermeiden. Gefährdete Komponenten sollten durch angemessene Maßnahmen gegenüber elektromagnetischen Störungen besser geschützt werden.

Place, publisher, year, edition, pages
2007. no 1-2, 67-80 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-11932OAI: oai:DiVA.org:kth-11932DiVA: diva2:290557
Note

QCR 20161209

Available from: 2010-02-04 Created: 2010-01-27 Last updated: 2016-12-09Bibliographically 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.
Series
Trita-EE, ISSN 1653-5146 ; 2010:006
Identifiers
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)
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Available from: 2010-02-01 Created: 2010-02-01 Last updated: 2012-03-26

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CiteExportLink to record
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