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1、附录ALabVIEWBasedInstrumentCurrentTransformerCalibratorXinAiHalBaoY.H.Song1)NorthChinaElectricPowerUniversity,Beijing,China1072062)BrunelUniversity.UKABSTRACTTheVirtualInstrument(VI)mainlyreferstobuildallkindsofinstrumentsbysoftwaresuchasLabVIEW,whichlikesarealinstrumentbuildinacomputer.It
2、s'maincharacteristicsareflexibility,multi-functions,multipleusesforonePCcomputer,givinghighperformance,andislesscostly.Inthispaper,theVItechnologyisappliedtothetestandmeasurementofinstrumentcurrenttransformer(TA).ByusingtheLabVIEW,theTAaccuracycalibratorwasdeveloped.ThisvirtualT.4calibra
3、torcanautomaticallymeasuretheaccuracyofT.4andcanindicatetheratioerrorandphaseerrorcurves.ThetestsandcalibrationfortheTAshowthatthevirtualTAcalibratorcanbeusedinplaceofthetraditionalcalibratorandismuchbetterthanthetraditionalone.Keywords：Instrumentcurrenttransformer(TA),TAcalibrator,Virtu
4、alInstruments,LabVIEW.I.INTRODUCTIONSince1992theVXIbusRev.1.4standardwasestablishedbytheUnitedStatesandLabVIEWwaspresentedbytheNationalInstrumentsco.(Nl),theVirtualInstrument(VI)havelainthefoundationforitscommercialuse.ThemaincharacteristicofVirtualInstrumentisthatitmakesinstrumentsbysof
5、tware.MostofthetraditionalinstrumentcanbedevelopedbyVI.TheVIisarealinstrumentmadebythepersonalcomputer.TheInstrumentcurrenttransformer(TA)iswidelyusedinallkindsofcurrentmeasurementandithasthefunctionsofprotection,isolationandextendingthemeasuringrange.Withtherapiddevelopmentofcomputermea
6、surementandcontroltechnology,andwiththesequentemergenceofcurrenttransformerandtransducer,thereisanincreasingnumberofcurrenttransformerswithhighaccuracyandlowsecondarycurrent.ThestandardTAsecondarycurrentisusually1Aor5A:somenon-standardTAsecondarycurrentmaybe01Aorlower.Althoughwehavethete
7、chniquetomakethiskindofcalibratorbymeansofhardwaresuchassinglechipcomputerandelectroniccircuit,DSPandsoon,itwillcosttoomuchmoneyfortheseno-standardcalibratorandwilltaketoomuchtimeandthecalibratormadebythesehardwaremillnotbesatisfactoryinbothfunctionandpracticalityfordesig
