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Analytical fields expressions due to lightning channel considering variation of return stroke velocities along the lightning channel
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2012 (English)In: Lightning Protection, (ICLP) 2012, 2012, 6344252- p.Conference paper (Refereed)
Abstract [en]

The return stroke velocity is an important factor for evaluation of lightning electromagnetic fields. Measurements showed that the return stroke velocity is varied at different heights along lightning channel while it is usually entered into field calculations with a constant value in previous studies. This paper presents the analytical electromagnetic fields expressions due to vertical lightning channel where velocity profile along channel is considered. The proposed fields expressions can be used to estimate electromagnetic fields directly in the time domain (without needing to apply any extra conversion to Frequency domain) whereas they are based on Heidler current function and can support widely used engineering current models. Likewise, the proposed field expressions are applied on a typical measured profile of velocity and also a function of velocity profile and the evaluated fields are compared to the corresponding simulated fields based on constant value of velocity and the results are discussed accordingly.

Place, publisher, year, edition, pages
2012. 6344252- p.
Keyword [en]
electromagnetic fields, lightning channel, return stroke velocity, Current function, Current models, Different heights, Field calculation, Frequency domains, Lightning electromagnetic field, Return stroke, Time domain, Value of velocity, Velocity profiles, Lightning protection, Models, Velocity
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-193904DOI: 10.1109/ICLP.2012.6344252ISBN: 978-146731897-6OAI: oai:DiVA.org:uu-193904DiVA: diva2:604822
2012 31st International Conference on Lightning Protection, ICLP 2012, 2 September 2012 through 7 September 2012, Vienna
Available from: 2013-02-12 Created: 2013-02-06 Last updated: 2013-03-04Bibliographically approved

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Cooray, Vernon
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