Calculation of the cyclic and emergency current rating of cables - Part 3: Cyclic rating factor for cables of all voltages, with partial drying of the soil

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Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English - French, Spanish, Castilian

Published date

18-02-2002

Publisher

International Electrotechnical Committee

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Symbols
4 Description of method
   4.1 General description
   4.2 Principles
   4.3 Formulae
Annex A (informative) Example calculation
Annex B (informative) Details of cables and load
        used for example

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.

Committee	TC 20
DevelopmentNote	Stability Date: 2020. (10/2012)
DocumentType	Standard
Pages	29
PublisherName	International Electrotechnical Committee
Status	Current

Standards	Relationship
SANS 60853-3 : 1ED 2011	Identical
BS IEC 60853-3:2002	Identical
NEN IEC 60853-3 : 2002	Identical
UNE 21191-3:2003	Identical
SANS 60853-3:2011(R2018)	Identical

IEC 60853-2:1989	Calculation of the cyclic and emergency current rating of cables. Part 2: Cyclic rating of cables greater than 18/30 (36) kV and emergency ratings for cables of all voltages
CEI 20-89 : 2009	SELECTION AND ERECTION OF MEDIUM VOLTAGE ELECTRIC CABLES AND ACCESSORIES - APPLICATION CRITERIA
BS 7450:1991	Method for determination of economic optimization of power cable size

IEC 60287-2-1:2015 RLV	Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
IEC 60853-2:1989	Calculation of the cyclic and emergency current rating of cables. Part 2: Cyclic rating of cables greater than 18/30 (36) kV and emergency ratings for cables of all voltages

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IEC 60853-3:2002

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