外文翻译--基于LabVIEW的电流互感器校验仪（适用于毕业论文外文翻译+中英文对照）Word下载.doc

外文翻译--基于LabVIEW的电流互感器校验仪（适用于毕业论文外文翻译+中英文对照）Word下载.doc

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学院：

信息与电子工程学院

专业：

测控技术与仪器

班级：

测仪

学号：

学生姓名:

指导教师：

二O一O年四月

外文翻译之一

ALabVIEWBasedInstrumentCurrentTransformerCalibrator

XinAiHaiBaoY.HSong

（1）NorthChinaElectricPowerUniversity,Beijing,China102206

（2）BrunelUniversity.UK

ABSTRACT

TheVirtualInstrument（VI）mainlyreferstobuildallkindsofinstrumentsbysoftwaresuchasLabVIEW,whichlikesarealinstrumentbuildinacomputer.Its'

maincharacteristicsareflexibility,multi-functions,multipleusesforonePCcomputer,givinghighperformance,andislesscostly.Inthispaper,theVItechnologyisappliedtothetestandmeasurementofinstrumentcurrenttransformer（TA）.ByusingtheLabVIEW,theTAaccuracycalibratorwasdeveloped.ThisvirtualTAcalibratorcanautomaticallymeasuretheaccuracyofTAandcanindicatetheratioerrorandphaseerrorcurves.ThetestsandcalibrationfortheTAshowthatthevirtualTAcalibratorcanbeusedinplaceofthetraditionalcalibratorandismuchbetterthanthetraditionalone.

Keywords:

Instrumentcurrenttransformer（TA）,TAcalibrator,VirtualInstruments,

LabVIEW

Ⅰ.INTRODUCTION

Since1992theVXIbusRew.1.4standardwasestablishedbytheUnitedStatesandLabVIEWwaspresentedbytheNationalInstrumentsco.（NI）,theVirtualInstrument（VI）havelainthefoundationforitscommercialuse.ThemaincharacteristicofVirtualInstrumentisthatitmakesinstrumentsbysoftware.MostofthetraditionalinstrumentcanbedevelopedbyVI.TheVIisarealinstrumentmadebythepersonalcomputer.[1]

TheInstrumentcurrenttransformer（TA）iswidelyusedinallkindsofcurrentmeasurementandithasthefunctionsofprotection,isolationandextendingthemeasuringrange.Withtherapiddevelopmentofcomputermeasurementandcontroltechnology,andwiththesequentemergenceofcurrenttransformerandtransduczr,thereisanincreasingnumberofcurrenttransformerswithhighaccuracvandlowsecondarlycurrent.ThestandardTAsecondarycurrentisusually1Aor5A，somenon-standardTAsecondarycurrentmaybe0.1Aorlower[2][3].Althoughwehavethetechniquetomakethiskindofcalibratorbymeansofhardwaresuchassinglechipcomputerandelectroniccircuit,DSPandsoon[4-8],itwillcosttoomuchmoneyfortheseno-standard

Ⅲ-1

calibratorandwilltaketoomuchtimeandthecalibratormadebythesehardwaremillnotbesatisfactoryinbothfunctionandpracticalityfordesigningallkindsofnewTA.

ThecalibratorthatadoptsVItechnologynotonlycanmeettherequirementsofthetraditionalonebutalsocansatisfycustomerswithsuchadvantagesasmulti-functions,convenience,andhighratiobetweenperformanceandcost.TheexperimentresultsindicatethatthevirtualcalibratorcanprovideexcelIentconditionforTAmeasurementanddesign.TheVItechnologandpersonalcomputermustbewidelyusedintheareaofcalibrationoninstrumenttransformer.

Ⅱ.THEWORNNGPRINCIPLEOFTACALIBRATOR

TheerrorofTAincludesratioerrorandphaseerror.ThemeasuringoftheerrorofTAorthecalibrationoftheaccuracyofTAusuallyappliesdifferentialmeasuringmethod.ThemethodneedsastandardTAexceptthemeasuredTAandaTAcalibrator.ThereisthesametumratiobetweenthestandardandmeasuredTAandthestandardTA'

saccuracyshouldbe2levelshigherthanthemeasuredone.Thecalibratorfunctionliesinformingcomparisoncircuits,measuring,andshowingtheerroratallrange.Thecomparisoncircuit,alsoreferredtothedifi-erencemeasuringprinciplecircuit,isshowedinFig.1.BymeasuringthevoltageonR0andRd,calculatethecorrespondingcurrent.Thenthecalibratorcanindicatetheerrors.

Fig.1SchematicofTAcomparisoncircuit

WhenaTAhasthesameturnratiobetweentheprimaryandsecondarywinding,theself-comparisoncircuitcouldbeusedandisshowninFig.2.Inthefigures,TA0andTAxarestandardan