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1、附录ALabVIEWBasedInstrumentCurrentTransformerCalibratorXinAiHalBaoY.H.Song1)NorthChinaElectricPowerUniversity,Beijing,China1072062)BrunelUniversity.UKABSTRACTTheVirtualInstrument(VI)mainlyreferstobuildallkindsofinstrumentsbysoftwaresuchasLabVIEW,whichlikesareal
2、instrumentbuildinacomputer.Its'maincharacteristicsareflexibility,multi-functions,multipleusesforonePCcomputer,givinghighperformance,andislesscostly.Inthispaper,theVItechnologyisappliedtothetestandmeasurementofinstrumentcurrenttransformer(TA).ByusingtheLabVIEW
3、,theTAaccuracycalibratorwasdeveloped.ThisvirtualT.4calibratorcanautomaticallymeasuretheaccuracyofT.4andcanindicatetheratioerrorandphaseerrorcurves.ThetestsandcalibrationfortheTAshowthatthevirtualTAcalibratorcanbeusedinplaceofthetraditionalcalibratorandismuchb
4、etterthanthetraditionalone.Keywords：Instrumentcurrenttransformer(TA),TAcalibrator,VirtualInstruments,LabVIEW.I.INTRODUCTIONSince1992theVXIbusRev.1.4standardwasestablishedbytheUnitedStatesandLabVIEWwaspresentedbytheNationalInstrumentsco.(Nl),theVirtualInstrume
5、nt(VI)havelainthefoundationforitscommercialuse.ThemaincharacteristicofVirtualInstrumentisthatitmakesinstrumentsbysoftware.MostofthetraditionalinstrumentcanbedevelopedbyVI.TheVIisarealinstrumentmadebythepersonalcomputer.TheInstrumentcurrenttransformer(TA)iswid
6、elyusedinallkindsofcurrentmeasurementandithasthefunctionsofprotection,isolationandextendingthemeasuringrange.Withtherapiddevelopmentofcomputermeasurementandcontroltechnology,andwiththesequentemergenceofcurrenttransformerandtransducer,thereisanincreasingnumber
7、ofcurrenttransformerswithhighaccuracyandlowsecondarycurrent.ThestandardTAsecondarycurrentisusually1Aor5A:somenon-standardTAsecondarycurrentmaybe01Aorlower.Althoughwehavethetechniquetomakethiskindofcalibratorbymeansofhardwaresuchassinglechipcomputerandelectron
8、iccircuit,DSPandsoon,itwillcosttoomuchmoneyfortheseno-standardcalibratorandwilltaketoomuchtimeandthecalibratormadebythesehardwaremillnotbesatisfactoryinbothfunctionandpracticalityfordesig
