BS IEC 60287-2-1:1994+A2:2006:2008 Edition
$167.15
Electric cables. Calculation of the current rating – Thermal resistance – Calculation of thermal resistance
| Published By | Publication Date | Number of Pages |
| BSI | 2008 | 36 |
The contents of the corrigendum of January 2008 have been included in this copy.Applicable to steady-state operation of cables at all alternating voltages and direct voltages up to 5 kV. This section provides formulae for thermal resistance.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | Contents |
| 5 | Introduction 1 General 1.1 Scope |
| 6 | 1.2 Symbols |
| 8 | 2 Calculation of thermal resistances 2.1 Thermal resistance of the constituent parts of a cable, |
| 13 | 2.2 External thermal resistance |
| 20 | 3 Digital calculation of quantities given graphically 3.1 General |
| 23 | 3.2 Calculation |
| 24 | Table 1 Thermal resistivities of materials |
| 25 | Table 2 Values for constants |
| 26 | Table 3 Absorption coefficient of solar radiation for cable surfaces Table 4 Values of constants Figure 1 Diagram showing a group of q cables and their reflection in the ground-air surface |
| 27 | Figure 2 Geometric factor G for two-core belted cables with circular conductors |
| 28 | Figure 3 Geometric factor |
| 29 | Figure 4 Thermal resistance of three-core screened cables with circular conductors compared to that of a c… |
| 30 | Figure 5 Thermal resistance of three-core screened cables with sector-shaped conductors compared with that… |
| 31 | Figure 6 Geometric factor |
| 32 | Figure 7a Heat dissipation coefficient for black surfaces of cables in free air |
| 33 | Figure 7b Heat dissipation coefficient for black surfaces of cables in free air |
| 34 | Figure 7c Heat dissipation coefficient for black surfaces of cables in free air |
| 35 | Figure 8 Graph for the calculation of external thermal resistance of cables in air |
