Transient Behavior of a System Composed of Conductive Thin Wire Structures Excited by Harmonic and Lightning Type Signals

Eduardo Faleiro,Gabriel Asensio,Jorge Moreno,Daniel García,Gregorio Denche

doi:10.4236/jemaa.2014.611035

Eduardo Faleiro, Gabriel Asensio + Show 3 more

Open Access

https://doi.org/10.4236/jemaa.2014.611035

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Abstract

The transient response of a system of independent electrodes buried in a semi-infinite conducting medium is studied. Using a simple and versatile numerical scheme written by the authors and based on the Electric Field Integral Equation (EFIE), the effect caused by harmonic signals ranging on frequency from Hz to hundred of MHz, and also by lightning type driving signal striking at a remote point far from the conductors, is extensively studied. The value of the scalar potential appearing on the electrodes as a function of the frequency of the applied signal is one of the variables investigated. Other features such as the input impedance at the injection point of the signal and the Ground Potential Rise (GPR) over the electrode system are also discussed.

Highlights

When a metallic conductor is buried in a semi-infinite medium of non-zero conductivity, and is energized by either a voltage or a current signal variable in time, an electromagnetic field, which is pro-How to cite this paper: Faleiro, E., Asensio, G., García, D., Denche, G. and Moreno, J. (2014) Transient Behavior of a System Composed of Conductive Thin Wire Structures Excited by Harmonic and Lightning Type Signals
When metallic electrodes are located in the vicinity of the active electrode, even if they are not energized, induced currents appear as a result of the interaction between them, all of which form a system of interacting conductors and their potential will differ from the one they have when they are isolated or not part of the system [5] [6]
When a perfect conductor is buried in a semi-infinite medium of conductivity σ and ε and μ electromagnetic parameters and is subjected to an harmonic excitation of frequency ω, the induced charges and currents act as sources of scalar φ and magnetic A potentials, so that the electric field induced by the harmonic signal and created by the structure is (Figure 1)

Summary

Introduction

When a metallic conductor (the active electrode) is buried in a semi-infinite medium of non-zero conductivity, and is energized by either a voltage or a current signal variable in time, an electromagnetic field, which is pro-. This is important since a metallic mass in low frequency regime can be considered equipotential, which means that a conductor can transmit the effect of belonging to a system of conductors to large distances compared with the characteristic size of the system Suffice it to consider such a linear passive electrode of great length that is near a small casual energized electrode and to transfer a non-zero potential. We study the effect that causes an intense and short excitation lightning type signal applied directly to the active electrode and at a remote point on the ground far from the electrode system [15] [16] This is intended to simulate the effect of a lightning strike on the vicinity of a facility grounding system consisting of a buried wire mesh and a metallic fence on the surface surrounding the installation

Theoretical Foundations

Numerical Solution and Application to Complex Systems

Induced Potentials in the Electrode System

Findings

Conclusions