Electromagnetic Modeling Of A Lightning Rod
Author(s)
D. Poljak, M. Birkic, D. Kosor, C. A. Brebbia & V. Murko
Abstract
This paper deals with a frequency domain analysis of a lightning rod using the
antenna theory model. The lightning rod struck by lightning is represented by a
straight thin wire antenna excited by an equivalent current source. The current
induced along a lightning rod due to a direct lightning strike is determined by
solving the homogeneous integro-differential equation of the Pocklington type.
Once obtaining the current distribution along the rod provides the calculation of
the charge induced along the rod and related irradiated electric field. The
corresponding Pocklington equation and field integral relationships are handled
via the Galerkin-Bubnov scheme of the Indirect Boundary Element Method (GBIBEM).
1 Introduction
Lightning flash surges are common sources of electromagnetic interferences (EMI)
induced on electrical and electronic systems and equipment, thus producing many
undesired effects, or even malfunction of systems and equipment [1–3]. The
purpose of a lightning protection system (LPS) in terms of lightning rod is to
capture a direct lightning strike. The main parameter of LPS is its efficiency which
measure is related to the probability of direct strike to LPS instead of strike to the
object within the protected volume defined by the protection zone. The protection
zone is considered to be substantially immune to lightning strike due to the air
terminal, i.e. the lightning rod. The protection zone around the rod can be assessed
by applying the full wave analysis [2]. In particular, the protection zone can be
determined if the electric field in the vicinity of the rod is known [4, 5].
Keywords
Related Book
Other papers in this volume
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