IEC 60853-3-ed.1.0

Detail information

Designation: IEC 60853-3-ed.1.0

Publication date: 18/02/2002

Pages: 29

Country: International technical standard

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Anotation

Gives a method for calculating the cyclic rating factor, for cables of all voltages, where partial drying out of the surrounding soil is anticipated. The method is based on one of the three methods published in a CIGRE document. The method is applicable to any type of cable, but it is recommended that it should be applied only to installations of one multi-core cable or to three single-core cables or to groups of circuits where the intercircuit spacing is sufficient to permit free vertical movement of soil moisture between the zones of dry soil associated with each circuit. This Standard does not preclude the use of other methods of calculation where full details of the load cycle are not known. The method assumes that the entire region surrounding a cable or cables has uniform thermal characteristics prior to drying out; the only non-uniformity being that caused by drying. As a consequence the method should not be applied, without further consideration, to installations where special backfills, having properties different from the site soil, are used. Donne une methode de calcul du facteur de capacite de transport cyclique pour les cables de toute tension, lorsquun assechement partiel du sol environnant est attendu. La methode est basee sur lune des trois methodes publiees dans un document CIGRE , La methode est applicable a tout type de cable, mais il est actuellement recommande de ne lappliquer quaux installations nayant quun seul cable multipolaire ou trois cables unipolaires ou a des groupes de circuits ou lespacement entre circuits est suffisant pour permettre une migration verticale libre de lhumidite du sol entre les zones de sol sec associees a chaque circuit. Cette norme necrate pas lutilisation dautres methodes de calcul dans lesquelles le cycle de charge nest pas completement detaille. La methode suppose que toute la zone entourant un cable ou des cables a des caracteristiques thermiques homogenes avant lassechement, la seule non-homogeneite etant celle causee par lassechement. En consequence, il convient de ne pas appliquer la methode sans autres considerations, aux installations ou des remblais controles ayant des caracteristiques thermiques differentes de celles du sol du site, sont utilises.