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
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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
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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
