BS IEC 60287-3-2:2012
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Electric cables. Calculation of the current rating – Sections on operating conditions. Economic optimization of power cable size
| Published By | Publication Date | Number of Pages |
| BSI | 2012 | 42 |
IEC 60287-3-2:2012 sets out a method for the selection of a cable size taking into account the initial investments and the future costs of energy losses during the anticipated operational life of the cable. Matters such as maintenance, energy losses in forced cooling systems and time of day energy costs have not been included in this standard. Two examples of the application of the method to hypothetical supply systems are given in Annex A.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | English CONTENTS |
| 5 | FOREWORD |
| 7 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references 3 Symbols |
| 12 | 4 Calculation of total costs |
| 15 | 5 Determination of economic conductor sizes 5.1 First approach: economic current range for each conductor in a series of sizes 5.2 Second approach: economic conductor size for a given load 5.2.1 General equation |
| 16 | 5.2.2 Linear cost function for cable costs |
| 17 | 5.2.3 Effect of charging current and dielectric losses |
| 19 | Annex A (informative) Examples of calculation of economic conductor sizes |
| 21 | Tables Table A.1 – Economic current ranges for cable sizes 25 mm2 to 400 mm2 |
| 25 | Table A.2 – Summary of costs Table A.3 – Cable details |
| 26 | Table A.4 – Economic loading Table A.5 – Current-carrying capacity criterion |
| 27 | Table A.6 – Economic loading, standard conductor size for all sections –Standard size: 150 mm2 Table A.7 – Economic loading, standard conductor size for all sections –Standard size: 185 mm2 |
| 28 | Figures Figure A.1 – System layout Table A.8 – Economic loading, standard conductor size for all sections –Standard size: 240 mm2 |
| 29 | Figure A.2 – Economic current ranges |
| 30 | Figure A.3 – Variation of cost with conductor size |
| 31 | Table A.9 – Cable details |
| 32 | Table A.10 – Steady state current ratings |
| 33 | Table A.11 – Total costs Table A.12 – Total cost versus anticipated operational life |
| 34 | Table A.13 – Losses versus anticipated operational life |
| 35 | Annex B (informative) Mean conductor temperature and resistance |
| 36 | Table B.1 – Required data for conductor sizes for the above example |
| 40 | Bibliography |
