IEC_TR_60909-2-2008.pdf

IEC/TR 60909-2Edition 2.0 2008-11TECHNICAL REPORT Short-circuit currents in three-phase a.c.systems Part 2:Data of electrical equipment for short-circuit current calculations IEC/TR 60909-2:2008(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC/TR 60909-2Edition 2.0 2008-11TECHNICAL REPORT Short-circuit currents in three-phase a.c.systems Part 2:Data of electrical equipment for short-circuit current calculations INTERNATIONAL ELECTROTECHNICAL COMMISSION XICS 17.220.01;29.240.20 PRICE CODEISBN 2-8318-1016-1 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TR 60909-2 IEC:2008(E)CONTENTS FOREWORD.4 1 General.6 1.1 Scope and object.6 1.2 Normative references.6 2 Data for electrical equipment.6 2.1 General.6 2.2 Data of typical synchronous machines.7 2.3 Data of typical two-winding,three-winding and auto-transformers.10 2.4 Data of typical overhead lines,single and double circuits.14 2.5 Data of typical high-voltage,medium-voltage and low-voltage cables.20 2.6 Data of typical asynchronous motors.35 2.7 Busbars.38 Annex A(informative)Information from National Committees.42 Bibliography.43 Figure 1 Subtransient reactance of synchronous machines 50 Hz and 60 Hz(Turbogenerators,salient pole generators,motors SM and condensers SC).8 Figure 2 Rated Voltage rGU and rated power factor rGcos of synchronous machines(Turbo generators,salient pole generators,motors and condensers 50 Hz and 60 Hz).9 Figure 3 Unsaturated and saturated synchronous reactance of two-pole turbo generators 50 Hz and 60 Hz(relative values).9 Figure 4 Three-winding transformer(No.6 of Table 3).12 Figure 5 Rated short-circuit voltage ukr of unit transformers in power stations(ST)with or without on-load tap-changer.13 Figure 6 Rated short-circuit voltages ukr of network transformers.14 Figure 7 Positive-sequence reactance L)1(XX=of low-voltage and medium-voltage overhead lines 50 Hz,Cu or Al,with one circuit according to Equation(15)of IEC 60909-0.16 Figure 8 Positive-sequence reactance L)1(XX=of overhead lines 50 Hz(60 Hz-values converted to 50 Hz).19 Figure 9 Type of overhead lines.20 Figure 10 Single-core cable 64 kV/110 kV with lead sheath 4.23 Figure 11 Reduction factor depending on the inducing current for cables with one lead sheath and two overlapping steel tapes,f=50 Hz 3.35 Figure 12 Reduction factor depending on the inducing current for cables with three lead sheaths and two overlapping steel tapes,f=50 Hz 3.35 Figure 13 Ratio rMLRII/of low-voltage and medium-voltage asynchronous motors,50 Hz and 60 Hz.37 Figure 14 Product rMrMxcos of low-voltage and medium-v