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1、附录ALabVIEWBasedInstrumentCurrentTransformerCalibratorXinAiHalBaoY.H.Song1)NorthChinaElectricPowerUniversity,Beijing,China1072062)BrunelUniversity.UKABSTRACTTheVirtualInstrument(VI)mainlyreferstobuildallkindsofinstrumentsbysoftwaresuchasLabVIEW,whichlikesarealinstrumentbuild
2、inacomputer.Its'maincharacteristicsareflexibility,multi-functions,multipleusesforonePCcomputer,givinghighperformance,andislesscostly.Inthispaper,theVItechnologyisappliedtothetestandmeasurementofinstrumentcurrenttransformer(TA).ByusingtheLabVIEW,theTAaccuracycalibratorwasdev
3、eloped.ThisvirtualT.4calibratorcanautomaticallymeasuretheaccuracyofT.4andcanindicatetheratioerrorandphaseerrorcurves.ThetestsandcalibrationfortheTAshowthatthevirtualTAcalibratorcanbeusedinplaceofthetraditionalcalibratorandismuchbetterthanthetraditionalone.Keywords：Instrumen
4、tcurrenttransformer(TA),TAcalibrator,VirtualInstruments,LabVIEW.I.INTRODUCTIONSince1992theVXIbusRev.1.4standardwasestablishedbytheUnitedStatesandLabVIEWwaspresentedbytheNationalInstrumentsco.(Nl),theVirtualInstrument(VI)havelainthefoundationforitscommercialuse.Themaincharac
5、teristicofVirtualInstrumentisthatitmakesinstrumentsbysoftware.MostofthetraditionalinstrumentcanbedevelopedbyVI.TheVIisarealinstrumentmadebythepersonalcomputer.TheInstrumentcurrenttransformer(TA)iswidelyusedinallkindsofcurrentmeasurementandithasthefunctionsofprotection,isola
6、tionandextendingthemeasuringrange.Withtherapiddevelopmentofcomputermeasurementandcontroltechnology,andwiththesequentemergenceofcurrenttransformerandtransducer,thereisanincreasingnumberofcurrenttransformerswithhighaccuracyandlowsecondarycurrent.ThestandardTAsecondarycurrenti
7、susually1Aor5A:somenon-standardTAsecondarycurrentmaybe01Aorlower.Althoughwehavethetechniquetomakethiskindofcalibratorbymeansofhardwaresuchassinglechipcomputerandelectroniccircuit,DSPandsoon,itwillcosttoomuchmoneyfortheseno-standardcalibratorandwilltaketoomuchtimeandthecalib
8、ratormadebythesehardwaremillnotbesatisfactoryinbothfunctionandpracticalityfordesig
