Electrical installation handlbook Volume 24 edition
Electricaldevices
1SDC010001D0204
ABBSACE
Electrical installationhandbook
Volume 2
Second edition 2004 First edition 2003Fourth edition 2006 Third edition 2005
Introduction
1 Standards
1.1General sspects...... 31.2 IEC Standards for electrical installation . 15
2Protection of feeders
2.1 Intodaction. 222.2 Installation and dimensioning of cables. 2.2.1 Current carying capacity and methods of installafion . 25 252.2.2 veoltsge drop... Instalation not buried in fhe gound. Instalation in ground. 31 44 562.4 Protection against short-circult 2.3 P Protection agsinst overlosd 2.2.3 Joule-effect losses 66 6725Neutrl sndprtective conductors 2.6 Busbar trunking systems. .......... 70 78
3 Protection of electrical equipment
3.2Protection and witching of generators 3.1 Protection and switching of lighting circults 101 1103.3 Protection and switching of motors 3.4 Protection and switching of transformers 136 115
4 Power factor correction 4 1General sspects..... 4.2 Power factor correction methodl .. 150 1564.3 Circult-breskers for the protection and switching of capacitor banks ... 163
5 Protection of human beings
5.1 General sspects: effects of courent on human beings ..... 1665.2 5.3 Distribution systems Protection agsinst bofh drect and indirect contact TT system 169 1725.4 5.5 5.6 IT system wis NI 175 178 1815.8 Maximum protected length for the protection of human beings 5.7 Residual ourent devfces 183 186
6Caculation of short-circuit current
6.1 6.2 6.3 Determination of the short-circulit current: *short-circult Fault typologies General aspects 204 204power method" 6.3.1 Calculation of the short-circuit curent .206 2066.3.3 6.3.4 Examples 6.3.2 Cslultin f teshtcirutpoer at thfaul ot Calculation of the short-circuft current ... 209 210 2126.4 Determination of the short-circult current Ik downstream of a cable as a function of fthe upstresm one ..... 218 2166.5 Algebra of sequences 6.5.1 6.5.2 General sspects Positive negative and zero sequence systems . 218 2196.5.3 Cslculation of shorl-circuit ouments with the algebra 6.5.4 Peiive negtie and er sequence shorl-ict of sequences 2206.5.5 Formulas for the calculsfion of the fault curents as a function of the eiectrical parameters of the plart.... impedances of electrical equipment . 223 2266.6 Calculafion of the peak vske of fhe shot-cirouit cument. 9 Considerations about UIPS contribution to the short-ciroult 229 230
Annex A: Calculation tools
A.1 Slide rules . 233Annex C:Harmonics Annex B: Calculation of load current 1 A.2 DOCWin .238 242 246Annex D: Calculaftion of the coefficient k for the cables. Annex E: Main physical quantities and electrotechnical formulas 254 258
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 corect definifion of equipment in numerous practical installation situations.
The dimersioning of an electrical plant requires knowledge of diflerent factorsrelating to for example installation utities the electrical conductors and other ponents; this knowledge leads the design engineer to consult numeroushowever aims to supply in a single document tables for the quick definition of documents and technical catalogues. This electrical installation handbook the main parameters of the ponents of an electrical plant and for the selection of the protection devices for a wide range of installations. Some applicafionexamples are included to aid prehension of the selection tables.
Electrical installation handbook users
The electrical installafion handbook is a tool which is suitable for all those whoare interestecl in electrical plants: useful forinstalers and maintenance technicians through brief yet imporlant electrotechnical references and for sales engineersthrough quick reference selection tables.
Validity of the electrical installation handbook
process for example those regarding the constructional characteristics of electrical machinery In every case where possible correction factors are givenfor actual condltions which may difer from the assumed ones. The tables are always drawn up conservatively in favour of safety: for more accuratecalculafions the use of DOCWin software is remended for the dimensioning of electrical installations.
