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Laboratory simulation of direct lightning strokes to a modelled building - measurement of magnetic fields and induced voltages

  • In IEC 61312-2 equations for the assessment of the magnetic fields inside structures due to a direct lightning strike are given. These equations are based on computer simulations for shields consisting of a single-layer steel grid of a given mesh width. Real constructions, however, contain at least two layers of reinforcement steel grids. The objective of this study was to experimentally determine the additional shielding effectiveness of a second reinforcement layer compared to a single-layer grid. To this end, simulated structures were set up in the high current laboratory. The structures consisted of cubic cages of 2 m side length with one or with two reinforcement grids, respectively. The structures were exposed to direct lightning currents representing the variety of anticipated lightning current waveforms. The magnetic fields and their derivatives at several positions inside the structure as well as the voltage between “floor” and “roof” in the center were determined for different current injection points. From these data the improvement of the shielding caused by a second reinforcement layer is derived.

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Author:Wolfgang J. Zischank, Fridolin Heidler, Alexander Kern, I. A. Metwally, J. Wiesinger, M. Seevers
Document Type:Conference Proceeding
Year of Completion:2002
Publishing Institution:Fachhochschule Aachen
Contributing Corporation:International Conference on Lightning Protection <26, 2002, Kraków>
Date of the Publication (Server):2005/06/07
Tag:Direkter Blitzschlag; Elektromagnetischer Schutzschild; Induzierte Spannungen; Magnetische Felder; Stahlbetonkonstruktion
Lightning; electromagnetic shielding; induced voltage; magnetic field; reinforced concrete
Institutes:FH Aachen / Fachbereich Energietechnik
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie