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DC Component From Pantograph Arcing in AC Traction System-Influencing Parameters, Impact, and Mitigation Techniques
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-1607-2493
2011 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 53, no 1, 18-27 p.Article in journal (Refereed) Published
Abstract [en]

Pantograph arcing in ac traction system generates transients, and causes asymmetries and distortion in supply voltage and current waveforms. These asymmetric voltage and current lead to a net dc component and harmonics that propagate within the traction power and signalling system and cause electromagnetic interference. This problem is enhanced during winter because of the layer of ice/snow on the overhead contact wire. The sliding contact becomes poor and a visible arc moves along with the pantograph. In this paper, it is shown how different parameters like traction current, line speed, power factor, and supply voltage influence the arcing, its characteristics, and the dc components. It is shown that the dc current component increases with increasing train speed and traction current, and reduces at a lower power factor. It is also discussed how the presence of an ice layer influences the arcing and the dc components. It is found that running the trains below the normal operating power factors is an effective choice to mitigate this problem. The findings presented in this paper could be beneficial to estimate the probable limit of the dc component at the planning stage so that proper precautions can be taken at the design stage itself.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011. Vol. 53, no 1, 18-27 p.
Keyword [en]
Arc discharges, electromagnetic compatibility, electromagnetic interference, rail transportation, rail transportation power systems
National Category
Control Engineering Vehicle Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
URN: urn:nbn:se:kth:diva-14318DOI: 10.1109/TEMC.2010.2045159ISI: 000287407300003ScopusID: 2-s2.0-79951931347OAI: diva2:332208

QC 20100803. Updated from submitted to published, 20120315. Previous title: Component from Pantograph Arcing in AC Traction System- Influencing Parameters, Impact and Mitigation Techniques

Available from: 2010-08-03 Created: 2010-08-03 Last updated: 2016-02-22Bibliographically 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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Midya, SurajitThottappillil, Rajeev
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