BS IEC 60287-2-3:2017
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Electric cables. Calculation of the current rating Thermal resistance. Cables installed in ventilated tunnels
03-07-2024
19-07-2017
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Description of method
5 Formulae for air properties
6 Temperature profile
Annex A (informative) - Calculation example
Annex B (informative) - Delta-star transformation
Annex C (informative) - Calculation of F[m] coefficient
Bibliography
Specifies a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels.
| Committee |
GEL/20/16
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| DevelopmentNote |
Supersedes 13/30288278 DC. (08/2017)
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| DocumentType |
Standard
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| PublisherName |
British Standards Institution
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| Status |
Superseded
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| SupersededBy | |
| Supersedes |
This part of IEC60287 describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable. The method applies to natural as well as forced ventilation. Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible. All cables are assumed to be identical within the tunnel and it is assumed that the tunnel cross-section does not change with distance along the tunnel.
| Standards | Relationship |
| IEC 60287-2-3:2017 | Identical |
| IEC 60287-2-1:2015 RLV | Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance |
| IEC 60287-1-1:2006+AMD1:2014 CSV | Electric cables - Calculation of the current rating - Part 1-1:Current rating equations (100 % load factor) and calculation of losses - General |
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