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Analysis of ground potential distribution under lightning current condition


Gomes, Chandima and Sabry, Riyadh Z. (2017) Analysis of ground potential distribution under lightning current condition. Pertanika Journal of Science & Technology, 25 (spec. Feb.). pp. 181-188. ISSN 0128-7680; ESSN: 2231-8526

Abstract / Synopsis

The grounding system of a lightning protection scheme is designed basically to avoid arcing and dangerous step potentials. The grounding impedance of the system varies depending on soil structure and frequency. This paper describes the effect of harmonic impedance (also called frequency dependence of soil) on potential distribution under lightning strike to a metal tower with single grounding path, for different soil types. The results show that the peak value of ground potential rise (GPR) and step voltage (SP) may reach extremely hazardous values even at distances in the order of 90 m from the tower footing, especially when soil resistivity is high. Hence, we emphasise that, in contrast to power grounding, when designing of grounding systems that are meant to handle transient or high frequency currents as well, the frequency dependent soil parameters should be considered to avoid hazardous situations, especially at locations with a high probability of lightning strikes such as metal towers.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: Universiti Putra Malaysia Press
Keywords: Lightning; Frequency dependence of soil; Grounding; Transient impedance; GPR; SP
Depositing User: Nabilah Mustapa
Date Deposited: 30 Jun 2017 17:49
Last Modified: 05 Jul 2017 11:41
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