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Pantograph Arcing in Electrified Railways-Mechanism and Influence of Various Parameters-Part II: With AC Traction Power Supply
Bombardier Transportation, Stockholm, Sweden.
ABB Corporate Research, Västerås, Sweden.
Rejlers Ingenjörer AB, Västerås, Sweden.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (EMC)ORCID iD: 0000-0002-1607-2493
2009 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 24, no 4, 1940-1950 p.Article in journal (Refereed) Published
Abstract [en]

Pantograph arcing with ac supply generates transients, cause asymmetries and distortion in supply voltage and current waveforms and can damage the pantograph and the overhead contact line. The asymmetry generates a net dc component and harmonics, which propagate within the traction power and signalling system and causes electromagnetic interference. Unlike dc-fed systems (Part I), the arcing in ac supply is complex because of the zero crossing of currents and voltages. In this paper, we discuss the mechanisms of sliding contact and arcing between pantograph-contact wire using the experimental setup described in Part I. Influences of various parameters and test conditions on arcing phenomenon and their signature patterns on the supply voltage and current waveforms are presented. It is shown how the arcing mechanism and corresponding asymmetry in the voltage and current waveforms are governed by line speed, current, supply voltage, inductive load, and pantograph material. The asymmetry in the current waveform is mainly due to the difference in the duration of successive zero-current regions and uneven distortion of the waveshapes. This, in turn, creates the asymmetry in the voltage waveform. The findings presented in this paper could be beneficial for coming up with appropriate mitigation techniques from the electromagnetic interference due to pantograph arcing in ac traction systems.

Place, publisher, year, edition, pages
2009. Vol. 24, no 4, 1940-1950 p.
Keyword [en]
Arc discharges, electromagnetic compatibility (EMC), electromagnetic interference (EMI), rail transportation, rail-transportation power systems
National Category
Vehicle Engineering Control Engineering Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-14316DOI: 10.1109/TPWRD.2009.2021036ISI: 000270139900024ScopusID: 2-s2.0-70350286219OAI: diva2:332198

QC 20100803

Available from: 2010-08-03 Created: 2010-08-03 Last updated: 2016-05-23Bibliographically approved
In thesis
1. Conducted and Radiated Electromagnetic Interference in Modern Electrified Railways with Emphasis on Pantograph Arcing
Open this publication in new window or tab >>Conducted and Radiated Electromagnetic Interference in Modern Electrified Railways with Emphasis on Pantograph Arcing
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Arcing from the pantograph, a commonly observed phenomenon, is knownto be a major source of wideband electromagnetic emission which is more pronounced during the winter. Experience within the railway industry has shown that this source of EMI and its characteristics need to be understood thoroughly for solving the associated EMI issues in the desired fashion. This thesis investigates EMI generation from pantograph arcing. The First phase of the work is based on experimental investigations and analyses conducted on a test setup which closely resembles pantographcontact wire interaction. Different possible mechanisms of the pantograph arcing and inuencing parameters like speed of the train, loadcurrent, voltage level, power factor etc. are identified. It was found that pantograph arcing is a polarity dependent phenomenon. It generates transients and asymmetrically distorted voltage and current waveforms. This in turn generates a net DC component and odd and even harmonics(up to order 10 was measured). In the second phase, different characteristics of these high frequency emission and inuencing parameters have been analyzed and presented. Presence of wideband high frequency components in the range from afew ten kHz to a few hundred MHz at measured current, electric and magnetic elds were confirmed. 10-90 % risetimes for current was measured from 5 ns to typically around 25 ns, whereas for electric field this is ranged from fraction of onens to 25 ns. Although there are variations, the rise times of the measuredtime domain waveform of current, electric and magnetic seems to have correlation with the higher frequency components. It was understood that major high frequency components measured could be from: (a) thearcing itself, (b) radiation from connected cables/wires, (c) resonance inthe associated circuits and (d) associated digital circuitry.This wideband electromagnetic emission causes interference in traction power, signalling and train control systems. Their possible propagation paths and consequences on different equipments are also elaborated.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xvi, 163 p.
Trita-EE, ISSN 1653-5146 ; 2009:029
National Category
Control Engineering
urn:nbn:se:kth:diva-10574 (URN)978-91-7415-345-3 (ISBN)
Public defence
2009-06-01, sal F3, KTH, Lindstedtv 26, Stockholm, 09:30 (English)
QC 20100803Available from: 2009-05-27 Created: 2009-05-27 Last updated: 2012-03-26Bibliographically approved

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