| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | 30477033 <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | A-30431016 <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | 4 Calculation of thermal resistances 4.1 Thermal resistance of the constituent parts of a cable, T1, T2 and T3 4.1.1 General 4.1.2 Thermal resistance between one conductor and sheath T1 <\/td>\n<\/tr>\n | ||||||
| 87<\/td>\n | 4.1.3 Thermal resistance of any generic annular layer 4.1.4 Thermal resistance between sheath and armour T2 <\/td>\n<\/tr>\n | ||||||
| 88<\/td>\n | 4.1.5 Thermal resistance of outer covering (serving) T3 <\/td>\n<\/tr>\n | ||||||
| 89<\/td>\n | 4.1.6 Pipe-type cables 4.2 External thermal resistance T4 4.2.1 Cables laid in free air <\/td>\n<\/tr>\n | ||||||
| 91<\/td>\n | 4.2.2 Single isolated buried cable 4.2.3 Groups of buried cables (not touching) <\/td>\n<\/tr>\n | ||||||
| 94<\/td>\n | 4.2.4 Groups of buried cables (touching) equally loaded <\/td>\n<\/tr>\n | ||||||
| 96<\/td>\n | 4.2.5 Cables in buried troughs 4.2.6 Cables in ducts or pipes <\/td>\n<\/tr>\n | ||||||
| 98<\/td>\n | 4.2.7 Cables or conduits laid in a medium of different thermal resistivity <\/td>\n<\/tr>\n | ||||||
| 99<\/td>\n | 5 Digital calculation of quantities given graphically 5.1 General 5.2 Geometric factor G for two-core belted cables with circular conductors <\/td>\n<\/tr>\n | ||||||
| 100<\/td>\n | 5.3 Geometric factor G for three-core belted cables with circular conductors <\/td>\n<\/tr>\n | ||||||
| 101<\/td>\n | 5.4 Thermal resistance of three-core screened cables with circular conductors compared to that of a corresponding unscreened cable <\/td>\n<\/tr>\n | ||||||
| 102<\/td>\n | 5.5 Thermal resistance of three-core screened cables with sector-shaped conductors compared to that of a corresponding unscreened cable <\/td>\n<\/tr>\n | ||||||
| 103<\/td>\n | 5.6 Curve for for obtaining the thermal resistance of the filling material between the sheaths and armour of SL and SA type cables <\/td>\n<\/tr>\n | ||||||
| 104<\/td>\n | 5.7 Calculation of \u0394\u03b8s by means of a diagram <\/td>\n<\/tr>\n | ||||||
| 105<\/td>\n | Tables Table 1 \u2013 Thermal resistivities of materials <\/td>\n<\/tr>\n | ||||||
| 106<\/td>\n | Table 2 \u2013 Extended values of the geometric factor for duct banks and backfills <\/td>\n<\/tr>\n | ||||||
| 107<\/td>\n | Table 3 \u2013 Values for constants Z, E and Cg for black surfaces of cables in free air <\/td>\n<\/tr>\n | ||||||
| 108<\/td>\n | Figures Figure 1 \u2013 Diagram showing a group of q cables and their reflection inthe ground-air surface Table 4 \u2013 Absorption coefficient of solar radiation for cable surfaces Table 5 \u2013 Values of constants U, V and Y <\/td>\n<\/tr>\n | ||||||
| 109<\/td>\n | Figure 2 \u2013 Geometric factor G for two-core belted cables withcircular conductors (see 4.1.2.2.2) <\/td>\n<\/tr>\n | ||||||
| 110<\/td>\n | Figure 3 \u2013 Geometric factor G for three-core belted cables withcircular conductors (see 4.1.2.2.4) <\/td>\n<\/tr>\n | ||||||
| 111<\/td>\n | Figure 4 \u2013 Thermal resistance of three-core screened cables withcircular conductors compared to that of a corresponding unscreened cable (see 4.1.2.3.1) <\/td>\n<\/tr>\n | ||||||
| 112<\/td>\n | Figure 5 \u2013 Thermal resistance of three-core screened cables withsector-shaped conductors compared to that of a corresponding unscreened cable (see 4.1.2.3.3) <\/td>\n<\/tr>\n | ||||||
| 113<\/td>\n | Figure 6 \u2013 Geometric factor for obtaining the thermal resistances ofthe filling material between the sheaths and armour of SLand SA type cables (see 4.1.2.5) <\/td>\n<\/tr>\n | ||||||
| 114<\/td>\n | Figure 7 \u2013 Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 1 to 4 <\/td>\n<\/tr>\n | ||||||
| 115<\/td>\n | Figure 8 \u2013 Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 5 to 8 <\/td>\n<\/tr>\n | ||||||
| 116<\/td>\n | Figure 9 \u2013 Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 9 and 10 <\/td>\n<\/tr>\n | ||||||
| 117<\/td>\n | Figure 10 \u2013 Graph for the calculation of external thermal resistance of cables in air <\/td>\n<\/tr>\n | ||||||
| 118<\/td>\n | Annex A (informative) Correction factor for increased lengths of individual cores within multicore cables Table A.1 \u2013 Values of CfL for different cases <\/td>\n<\/tr>\n | ||||||
| 119<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Electric cables. Calculation of the current rating – Thermal resistance. Calculation of thermal resistance<\/b><\/p>\n |