On the possible variation of the lightning striking distance as assumed in the IEC lightning protection standard as a function of structure height

Cooray, Vernon and Kumar, Udaya and Rachidi, Farhad and Lucci, Carlo Alberto (2014) On the possible variation of the lightning striking distance as assumed in the IEC lightning protection standard as a function of structure height. In: ELECTRIC POWER SYSTEMS RESEARCH, 113 (SI). pp. 79-87.

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Abstract

The effect of structure height on the lightning striking distance is estimated using a lightning strike model that takes into account the effect of connecting leaders. According to the results, the lightning striking distance may differ significantly from the values assumed in the IEC standard for structure heights beyond 30m. However, for structure heights smaller than about 30m, the results show that the values assumed by IEC do not differ significantly from the predictions based on a lightning attachment model taking into account the effect of connecting leaders. However, since IEC assumes a smaller striking distance than the ones predicted by the adopted model one can conclude that the safety is not compromised in adhering to the IEC standard. Results obtained from the model are also compared with Collection Volume Method (CVM) and other commonly used lightning attachment models available in the literature. The results show that in the case of CVM the calculated attractive distances are much larger than the ones obtained using the physically based lightning attachment models. This indicates the possibility of compromising the lightning protection procedures when using CVM. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	ELECTRIC POWER SYSTEMS RESEARCH
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Lightning; Lightning protection; Lightning striking distance; IEC lightning protection standard; Lightning attractive radius
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	18 Jul 2014 05:45
Last Modified:	18 Jul 2014 05:45
URI:	http://eprints.iisc.ac.in/id/eprint/49501

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