A critical evaluation and analysis of methods of determining the number of times that lightning will strike a structure
Date
2006-11-03T07:36:41Z
Authors
Ngqungqa, Sphiwe Hamilton
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Abstract
The primary objective of this paper is to present results regarding data obtained from Eskom’s Lightning Positioning and Tracking System (LPATS) and is a continuation of the work presented at the two SAUPEC Conferences in Pretoria and Stellenbosch [1, 2]. LPATS provides some useful information regarding the lightning field measurements around the Brixton and
Hillbrow Towers, in Johannesburg, for the
two seasons of June 2001 to June 2003.
The results suggest that there is a
significant increase in apparent ground
flash density in the vicinity of the towers
when compared to the surrounding areas.
The observation of mean current values in
the order of -20kA suggests that the
increased contribution of upward flashes
to the total incidence of flashes in tall
structures should lead to a decrease in
measured current amplitudes.
Description
Faculty of Engineering & Built Environment, School of Electrical & Info Engineering, Dissertation
Keywords
Tall structures, current amplitude, critical height