1、Short-circuit currents in three-phasea.c.systems Part 1:Factors for the calculation of short-circuitcurrents according to IEC 60909-0Reference numberIEC TR 60909-1:2002(E)TECHNICALREPORTIECTR 60909-1Second edition2002-07This English-language version is derived from the originalbilingual publication
2、by leaving out all French-languagepages.Missing page numbers correspond to the French-language pages.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IE
3、C is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The te
4、chnical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments a
5、nd corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-li
6、ne catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IE
7、C Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance
8、,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 Short-circuit currents in three-phasea.c.systems Part 1:Factors for the calculation of short-circuitcurrents according to IEC 60909-0For price,see current catalogue IEC 2002 Copyright-all right
9、s reservedNo 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 the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,Switze
10、rlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chTECHNICALREPORTIECTR 60909-1Second edition2002-07XCCommission Electrotechnique InternationaleInternational Electrotechnical Commission PRICE CODETR 60909-1 IEC:2002 3 CONTENTSFOREWORD.111General.151.1Scope and
11、 object.151.2Reference documents.151.3Application of the factors.151.3.1Factor c.151.3.2Factors KG and KS or KSO.151.3.3Factors KG,S,KT,S or KG,SO,KT,SO.151.3.4Factor KT.151.3.5Factor.171.3.6Factors,and q.171.3.7Factors m and n.171.3.8Contribution of asynchronous motors to the initial symmetrical sh
12、ort-circuit current.171.4Symbols,subscripts and superscripts.171.4.1Symbols.171.4.2Subscripts.191.4.3Superscripts.192Factors used in IEC 60909-0.192.1Voltage factor c for the equivalent voltage source at the short-circuit location.192.1.1General.192.1.2Calculation methods.212.1.3Equivalent voltage s
13、ource at the short-circuit location and voltagefactor c.212.1.4A simple model illustrating the meaning of the voltage factor c.232.2Impedance-correction factors when calculating the short-circuit impedances ofgenerators,unit transformers and power-station units.312.2.1General.312.2.2Correction facto
14、r KG.332.2.3Correction factors for power station units with on-load tap changer.372.2.4Correction factors for power station units without on-load tap-changer.592.2.5Influence of the impedance correction factor for power-station unitswhen calculating short-circuit currents in meshed networks andmaxim
15、um short-circuit currents at worst-case load flow.672.3Impedance correction factor KT when calculating the short-circuit impedancesof network transformers.732.3.1General.732.3.2Example for a network transformer SrT=300 MVA.752.3.3Statistical examination of 150 network transformers.832.3.4Impedance c
16、orrection factors for network transformers in meshednetworks.85TR 60909-1 IEC:2002 5 2.4Factor for the calculation of the peak short-circuit current.892.4.1General.892.4.2Factor in series R-L-circuits.892.4.3Factor of parallel R-L-Z branches.952.4.4Calculation of the peak short-circuit current ip in meshed networks.1012.4.5Example for the calculation of and ip in meshed networks.1052.5Factor for the calculation of the symmetrical short-circuit breaking current.1072.5.1General.1072.5.2Basic conce