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  4. Lightning Electromagnetic Fields and Their Induced Currents on Buried Cables. Part II: The Effect of a Horizontally Stratified Ground
 
research article

Lightning Electromagnetic Fields and Their Induced Currents on Buried Cables. Part II: The Effect of a Horizontally Stratified Ground

Paknahad, Javad
•
Sheshyekani, Keyhan
•
Rachidi, Farhad  
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2014
IEEE Transactions on Electromagnetic Compatibility

We use a finite element method (FEM) to evaluate the effect of a horizontally stratified two-layer ground on underground lightning electromagnetic fields and their induced currents on the shield of buried cables. It is shown that the azimuthal component of the magnetic field in the upper soil layer is affected by the soil stratification only when this layer is more conductive than the lower soil layer. On the other hand, inside the lower soil layer, this component is always affected by the soil stratification. The vertical electric field in the upper soil layer is mainly determined by the conductivity of the same layer in particular at close observation points. However, this component inside a more conductive lower soil layer is identical to that corresponding to a homogeneous soil with the same property of the lower soil layer. The horizontal electric field inside a stratified ground always takes values in between the electric fields corresponding to one-layer homogenous grounds. We also present a comparison with available experimental data on induced currents of a shielded buried cable and show that, in agreement with recent studies, taking the soil stratification into account allows to improve the late-time response of the induced currents. We also show that the horizontal stratification of soil may result, in some cases, in an enhancement of the induced currents with respect to the case of a homogeneous ground characterized by the electrical properties of either of the two layers.

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Type
research article
DOI
10.1109/TEMC.2014.2311926
Web of Science ID

WOS:000343060700018

Author(s)
Paknahad, Javad
Sheshyekani, Keyhan
Rachidi, Farhad  
Paolone, Mario  
Date Issued

2014

Publisher

Ieee-Inst Electrical Electronics Engineers Inc

Published in
IEEE Transactions on Electromagnetic Compatibility
Volume

56

Issue

5

Start page

1146

End page

1154

Subjects

Cable modeling

•

finite element method (FEM)

•

horizontally stratified ground

•

induced currents

•

lightning electromagnetic fields

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SCI-STI-FR  
DESL  
Available on Infoscience
October 1, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/107176
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