Title: Modelling earthing systems and cables with moment methods
Authors: Jacqmaer, Pieter ×
Driesen, Johan
Geuzaine, Christophe #
Issue Date: 2009
Publisher: Boole Press
Series Title: COMPEL vol:28 issue:4 pages:989-1004
Abstract: The purpose of this paper is to present a method to model earthing systems subjected to
lightning strikes with a one-dimensional moment method. This paper was conducted because an
accurate method to model earthing systems subjected to lightning strikes, was deemed necessary. To
name a few examples of relevant situations: supply stations of railway systems, from which also
critical signalling infrastructure is fed, earthing systems of cellular phone basestations, located in the
vicinity of high-antenna towers, prone to lightning strikes, and gas and oil pipelines. There exist
already methods to solve this problem, based on circuit theory, but the electromagnetic method of this
work is based directly on Maxwell’s equations and therefore more accurate.
The earthing electrodes and meshes are represented as wire
scatterers. First, the method is outlined for scatterers in a single medium. Next, the method is extended
to model to presence of the soil-air interface layer. An approximate technique, known as the modified
image theory, is used to account for the vicinity of the soil. Finally, a second extension is given so that
cables without metal sheets which are in the vicinity of the earthing systems, can be included in the
model. Thereafter, it is described how the method can be used to calculate the effects of lightning
strikes on earthing structures, and finally a validation of the method is presented.
The method is validated by applying it to simple situations which can also analytically be
calculated, and by applying it to earthing structures for which the transient voltage was measured or
calculated with circuit methods. A good agreement is seen. However, the method is computationally very
ISSN: 0332-1649
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - ELECTA, Electrical Energy Computer Architectures
× corresponding author
# (joint) last author

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