IMPACT OF ELECTROMAGNETIC LOSSES IN CLOSED TWO-COMPONENT MAGNETIC SHIELDS ON THE AMPACITY OF UNDERGROUND POWER CABLES

In this paper two typical arrangements of underground single-core high voltage three-phase power cables (flat and trefoil protected by PVC pipes) inside a closed shield of three different materials (low-carbon steel, non-oriented grain steel and aluminium) are analysed. The shield has two components...

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Bibliographic Details
Published in:Electromagnetic waves (Cambridge, Mass.) Mass.), 2013-01, Vol.135, p.601-625
Main Authors: del Pino-Lopez, Juan Carlos, Cruz-Romero, Pedro, Serrano-Iribarnegaray, Luis
Format: Article
Language:English
Subjects:
Electric waves
Electromagnetic radiation
Electromagnetic waves
Power lines
Underground
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Summary:In this paper two typical arrangements of underground single-core high voltage three-phase power cables (flat and trefoil protected by PVC pipes) inside a closed shield of three different materials (low-carbon steel, non-oriented grain steel and aluminium) are analysed. The shield has two components: a U-shaped base and a flat plate (cover) located on top of the base. Whereas most of previous papers on this subject only dealt with the degree of mitigation obtained with each material, this paper, in addition to also addressing this issue, mainly focusses on the effect that electromagnetic losses induced in the shield have on the ampacity of the cable and the cost involved (material and losses). To obtain the numerical results, a high number of simulations by a well-known commercial finite element method software (COMSOL Multiphysics) have been performed. The results obtained in the numerous cases analysed are widely commented and the solutions that enable an important mitigation with no current derating and at a comparatively low cost are highlighted.
ISSN:1559-8985
1070-4698
1559-8985
DOI:10.2528/pier12112303