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A current generation type return stroke model that predicts the return stroke velocity
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Elektricitetslära)
2007 (English)In: Journal of Lightning Research, ISSN 1652-8034, Vol. 1, 32-39 p.Article in journal (Refereed) Published
Abstract [en]

AbstractThe engineering return stroke models available in the literature can be divided into current generation andcurrent propagation types, which are also referred to as the traveling current source type and transmission linetype, respectively. In the current propagation models the return stroke channel serves as a guiding structure forthe return stroke current which is injected at ground level. In the current generation models each channelsection acts as a current source which is turned on by the arrival of the return stroke front at that channelsection. Once turned on, the current source associated with the channel section injects a current, called a coronacurrent, into the core of the return stroke channel. This current contribution is assumed to travel to groundalong the core of the return stroke channel with the speed of light in vacuum. In the current generation typereturn stroke models available today, the channel base current and the return stroke velocity together with eitherthe distribution of the charge neutralized during the return stroke or the temporal variation of the coronacurrent are assumed as input parameters. With these input parameters, model outputs are the spatial andtemporal variation of the return stroke current and either the temporal variation of the corona current or thedistribution of the charge neutralized by the return stroke, depending on the input parameters selected in themodel. In this paper, we utilize a current generation type return stroke model to predict the return stroke velocityusing the channel base current, distribution of the charge neutralized by the return stroke, and the temporalvariation of the corona current as input parameters. We will show that for physically reasonable inputparameters the predicted return stroke velocity initially increases with height, reaches a peak, and then decreaseswith increasing height.

Place, publisher, year, edition, pages
2007. Vol. 1, 32-39 p.
Keyword [en]
Return strokes, Return stroke velocity, Return stroke models, Electromagnetic compatibility, Electromagnetic fields
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-13964OAI: oai:DiVA.org:uu-13964DiVA: diva2:41734
Available from: 2008-04-25 Created: 2008-04-25 Last updated: 2010-11-11Bibliographically approved

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Cooray, Vernon
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