Per-unit impedances of synchronous machines — II

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1、following,itissuggestedthatthisxadPer-UnitImpedancesofSynchronousbasebeadoptedasapreferredstandard:(a).ItmakesXafdnumericallyequaltoMachines—IIxad,andatoncemakesunnecessaryanyfurtherdifferentiationbetweenthesequanti-ties.(b).ItmakesthestatorleakagereactanceA.W.RANKIN(Xd—Xafd)identicalwiththemo

2、refamiliarMEMBERAIEE"leakage"reactance(xd—xad).Withasimilardefinitionofthebasecurrentinthefictitiousquadrature-axisfieldcircuit,theHEprecedingpart1ofthispaperde-gested.SuchstandardizationisessentialstatorleakagereactanceisthesameforbothTrivedthegeneralizedper-unitequa-inorderthatpublishedvalue

3、sofper-unitaxes.tionsofthesynchronousmachine.Theimpedancesmaybeproperlyinterpreted(c).Itisinmorecommonuseatpresentmachineimpedancesweredividedintoandused.Manyadvantageswillaccruethananyotherbase(althoughimplicitlytwogroups:thosemeasurablefromthete^tnegeneraluseofapreferredbaseonly),andmanyofth

4、epresentimpedancestatorterminals(xd)Xd,r,andsoforth)7rotorcurrent.Thechiefoftheseisthat,formulasarebasedonit.calledthedefinitiveimpedances,andifallimpedancesarecalculatedonthethoseinternalimpedanceswhichcannotpreferredbase,theythenbecomeimmedi-Thebase-currentratioforthisfieldbemeasuredfromthes

5、tatorterminalsateavailableforuseingeneralanalysiscurrentisgivenbyequationlc.This(Xafd,Xffd,Rf/dyandsoforth),calledthe.orgeneralequivalentcircuitswithoutexpressionisderivedinthefollowingsec-nondefinitiveimpedances.Theper-unitfearofmisapplication,andwithoutthetionunderdefinition1.valuesofthedefi

6、nitiveimpedancesaretroubleandpossibleerrorsinvolvedinindependentofthebaserotorcurrents,determiningthebasecurrentonwhich*fdo4AdN1(ltfbutpartIshowedthatthe?per-unittheywerecalculatedandinconverting(3/2)ßá0ITFaxKyKaPiNfdvaluesofthenondefinitiveimpedancesthistoapreferredbase.Asanotherex-Theforegoi

7、ngdefinitionofbasecurrentarefunctionsofthebaserotorcurrents,ampleoftheadvantagesofapreferredisalsosuggestedfortheadditionalrotorandaccordinglyaresubjecttomisuseandbaserotorcurrent,itshouldbenotedthatcircuitsofmachineswithoneadditionalmi