Transient Plane Wave Coupling To A Finite Length
Wire Buried In A Conductive Ground
Author(s)
V. Dorić, D. Poljak & V. Roje
Abstract
The calculation of current induced on a straight wire buried in a lossy ground
due to a transient plane wave is presented. A frequency domain model is based
on the Pocklington integral equation arising from scattering theory and the thin
wire approximation. Influence of the nearby air-earth interface is taken into
account via the reflection coefficient appearing within the corresponding integral
equation kernel. The Pocklington integral equation is solved using the indirect
Galerkin-Bubnov variant of the boundary element method. Time domain results
are obtained by means of the inverse Fourier transform. Some illustrative
numerical examples are presented.
1 Introduction
The calculation of the current induced along power and communication cables
due to a plane wave is important issue in various EMC studies. Although there
are a large number of papers dealing with plane wave coupling to the overhead
wires [1]-[3], there are only few dealing with the buried wires [4, 5].
Most of the studies related to this problem are based on an approximate
transmission line (TL) approach. Although quite efficient for the long (infinite)
cables, TL approach fails for the finite length wires [6]. Alternative approach is
based on the wire antenna theory by which the radiation effects are taken into
account. Antenna theory approach provides accurate solutions for the finite
length wires. On the other hand the solution becomes significantly time
consuming when very long cables are considered.
Through the antenna theory approach the effects caused by the air-earth
interface are taken into account through exact Sommerfeld integral formulation.
Keywords
Related Book
Other papers in this volume
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