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1SDC010001D0204.Pdf 07 copertine 2006 28-03-2006 9:43 Pagina 2 C M Y CM MY CY CMY K Electrical installation handbook Volume 2 Electrical devices 4th edition 1SDC010001D0204 Electrical devices Due to possible developments of standards as well as of materials, the characteristics and dimensions specified in this document may only be considered binding after confirmation by ABB SACE. 1SDC010001D02045.000 - CAL 03/06 ABB SACE S.p.A. An ABB Group Company L.V. Breakers Via Baioni, 35 24123 Bergamo - Italy ABB SACE Tel.: +39 035.395.111 - Telefax: +39 035.395.306-433 http://www.abb.com Colori compositi Electrical installation handbook Volume 2 Electrical devices 4th edition March 2006 07 VOL2_frontespizio 1 10-03-2006, 10:25 First edition 2003 Second edition 2004 Third edition 2005 Fourth edition 2006 Published by ABB SACE via Baioni, 35 - 24123 Bergamo (Italy) All rights reserved 07 VOL2_frontespizio 2 10-03-2006, 10:25 Index Introduction ...............................................................................................................2 1 Standards 1.1 General aspects ............................................................................................. 3 1.2 IEC Standards for electrical installation ......................................................... 15 2 Protection of feeders 2.1 Introduction ..................................................................................................22 2.2 Installation and dimensioning of cables ......................................................... 25 2.2.1 Current carrying capacity and methods of installation ........................ 25 Installation not buried in the ground ................................................... 31 Installation in ground .......................................................................... 44 2.2.2 Voltage drop ........................................................................................56 2.2.3 Joule-effect losses .............................................................................. 66 2.3 Protection against overload .......................................................................... 67 2.4 Protection against short-circuit .....................................................................70 2.5 Neutral and protective conductors ............................................................... 78 2.6 Busbar trunking systems .............................................................................. 86 3 Protection of electrical equipment 3.1 Protection and switching of lighting circuits ................................................ 101 3.2 Protection and switching of generators ...................................................... 110 3.3 Protection and switching of motors ............................................................ 115 3.4 Protection and switching of transformers ................................................... 135 4 Power factor correction 4.1 General aspects ......................................................................................... 150 4.2 Power factor correction method ................................................................. 156 4.3 Circuit-breakers for the protection and switching of capacitor banks .......... 163 5 Protection of human beings 5.1 General aspects: effects of current on human beings ................................. 166 5.2 Distribution systems ................................................................................... 169 5.3 Protection against both direct and indirect contact ..................................... 172 5.4 TT system .................................................................................................. 175 5.5 TN system .................................................................................................. 178 5.6 IT system ................................................................................................... 181 5.7 Residual current devices ............................................................................ 183 5.8 Maximum protected length for the protection of human beings .................. 186 6 Calculation of short-circuit current 6.1 General aspects ......................................................................................... 204 6.2 Fault typologies .......................................................................................... 204 6.3 Determination of the short-circuit current: “short-circuit power method” .......................................................................................... 206 6.3.1 Calculation of the short-circuit current ............................................. 206 6.3.2 Calculation of the short-circuit power at the fault point .................... 209 6.3.3 Calculation of the short-circuit current ............................................. 210 6.3.4 Examples ........................................................................................ 212 6.4 Determination of the short-circuit current Ik downstream of a cable as a function of the upstream one ..................................................... 216 6.5 Algebra of sequences ................................................................................ 218 6.5.1 General aspects .............................................................................. 218 6.5.2 Positive, negative and zero sequence systems ................................ 219 6.5.3 Calculation of short-circuit currents with the algebra of sequences .................................................................................. 220 6.5.4 Positive, negative and zero sequence short-circuit impedances of electrical equipment ................................................ 223 6.5.5 Formulas for the calculation of the fault currents as a function of the electrical parameters of the plant .............................. 226 6.6 Calculation of the peak value of the short-circuit current ............................. 229 6.7 Considerations about UPS contribution to the short-circuit ........................ 230 Annex A: Calculation tools A.1 Slide rules ......................................................................................... 233 A.2 DOCWin ........................................................................................... 238 Annex B: Calculation of load current Ib ............................................................... 242 Annex C: Harmonics ............................................................................................. 246 Annex D: Calculation of the coefficient k for the cables ................................... 254 Annex E: Main physical quantities and electrotechnical formulas .................. 258 ABB SACE - Electrical devices 1 07 VOL2_001002 1 10-03-2006, 10:26 Introduction Scope and objectives The scope of this electrical installation handbook is to provide the designer and user of electrical plants with a quick reference, immediate-use working tool. This is not intended to be a theoretical document, nor a technical catalogue, but, in addition to the latter, aims to be of help in the correct definition of equipment, in numerous practical installation situations. The dimensioning of an electrical plant requires knowledge of different factors relating to, for example, installation utilities, the electrical conductors and other components; this knowledge leads the design engineer to consult numerous documents and technical catalogues. This electrical installation handbook, however, aims to supply, in a single document, tables for the quick definition of the main parameters of the components of an electrical plant and for the selection of the protection devices for a wide range of installations. Some application examples are included to aid comprehension of the selection tables. Electrical installation handbook users The electrical installation handbook is a tool which is suitable for all those who are interested in electrical plants: useful for installers and maintenance technicians through brief yet important electrotechnical references, and for sales engineers through quick reference selection tables. Validity of the electrical installation handbook Some tables show approximate values due to the generalization of the selection process, for example those regarding the constructional characteristics of electrical machinery. In every case, where possible, correction factors are given for actual conditions which may differ from the assumed ones. The tables are always drawn up conservatively, in favour of safety; for more accurate calculations, the use of DOCWin software is recommended for the dimensioning of electrical installations. 2 ABB SACE - Electrical devices 07 VOL2_001002 2 10-03-2006, 10:26 1 Standards 1.1 General aspects In each technical field, and in particular in the electrical sector, a condition sufficient (even if not necessary) for the realization of plants according to the “status of the art” and a requirement essential to properly meet the demands of customers and of the community, is the respect of all the relevant laws and technical standards. Therefore, a precise knowledge of the standards is the fundamental premise for a correct approach to the problems of the electrical plants which shall be designed in order to guarantee that “acceptable safety level” which is never absolute. Juridical Standards These are all the standards from which derive rules of behavior for the juridical persons who are under the sovereignty of that State. Technical Standards These standards are the whole of the prescriptions on the basis
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