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1、附录ALabVIEWBasedInstrumentCurrentTransformerCalibratorXinAiHalBaoY.H.Song1)NorthChinaElectricPowerUniversity,Beijing,China2)BrunelUniversity.UKABSTRACTTheVirtualInstrument(VI)mainlyreferstobuildallkindsofinstrumentsbysoftwaresuchasLabVIEW,whichlikesarealinstrumentbui
2、ldinacomputer.Its'maincharacteristicsareflexibility,multi-functions,multipleusesforonePCcomputer,givinghighperformance,andislesscostly.Inthispaper,theVItechnologyisappliedtothetestandmeasurementofinstrumentcurrenttransformer(TA).ByusingtheLabVIEW,theTAaccuracycalibr
3、atorwasdeveloped.ThisvirtualT.4calibratorcanautomaticallymeasuretheaccuracyofT.4andcanindicatetheratioerrorandphaseerrorcurves.ThetestsandcalibrationfortheTAshowthatthevirtualTAcalibratorcanbeusedinplaceofthetraditionalcalibratorandismuchbetterthanthetraditionalone.
4、Keywords：Instrumentcurrenttransformer(TA),TAcalibrator,VirtualInstruments,LabVIEW.I.INTRODUCTIONSince1992theVXIbusRev.1.4standardwasestablishedbytheUnitedStatesandLabVIEWwaspresentedbytheNationalInstrumentsco.(Nl),theVirtualInstrument(VI)havelainthefoundationforitsc
5、ommercialuse.ThemaincharacteristicofVirtualInstrumentisthatitmakesinstrumentsbysoftware.MostofthetraditionalinstrumentcanbedevelopedbyVI.TheVIisarealinstrumentmadebythepersonalcomputer.TheInstrumentcurrenttransformer(TA)iswidelyusedinallkindsofcurrentmeasurementandi
6、thasthefunctionsofprotection,isolationandextendingthemeasuringrange.Withtherapiddevelopmentofcomputermeasurementandcontroltechnology,andwiththesequentemergenceofcurrenttransformerandtransducer,thereisanincreasingnumberofcurrenttransformerswithhighaccuracyandlowsecon
7、darycurrent.ThestandardTAsecondarycurrentisusually1Aor5A:somenon-standardTAsecondarycurrentmaybe01Aorlower.Althoughwehavethetechniquetomakethiskindofcalibratorbymeansofhardwaresuchassinglechipcomputerandelectroniccircuit,DSPandsoon,itwillcosttoomuchmoneyfortheseno-s
8、tandardcalibratorandwilltaketoomuchtimeandthecalibratormadebythesehardwaremillnotbesatisfactoryinbothfunctionandpracticalityfordesigningal
