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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v17.i9.70
pages 831-840

IMPLEMENTATION OF OPTIMIZED BACKFILL MATERIALS FOR UNDERGROUND ELECTRIC POWER CABLES

You-Seong Kim
Department of Civil Engineering, Chonbuk National University, Jeonju 561-756, South Korea
Jaehong Kim
Dongshin University
Dae-Seong Cho
Department of Civil Engineering, Chonbuk National University, Jeonju 561-756, South Korea

RESUMO

The voltage and electric current should be increased to improve power transfer capability; however, their increases cause heat to be generated in the cables. The thermal resistivity of backfill material around buried power cables depends on its water content. Although an underground power cable generally produces 60° C heat, some power cables can cause thermal runaway in the dry condition. Thus, this triggers dielectric breakdown and creates factors that decrease power transmission efficiency. The objective of this study is to find the backfill material which maintains a low thermal resistivity in order to accommodate new cable systems that are designed for the most efficient operation at high temperature. The goal is 50° C-cm/W thermal resistivity in a wet condition, and 100° C-cm/W thermal resistivity in the dry condition.) However, river sand, widely used as a backfill material, has 150°C-cm/W thermal resistivity in the wet condition, and is more than double the wetted one in a dry condition. Experimental tests present a combination of crushed rock, recycled sand, stone powder, slag, and floc as an alternative backfill material for optimum heat transfer efficiency and construction waste recycling. The optimized backfill material is then validated by field tests and numerical analysis.


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