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AnAmerican-StandardCompanyTraneCommercialSystemsEngineeringTechnologyEngineeringLaboratoryEffectiveDate:3/9/04LastRevised:3/08/04ProcedureNumber:L09-0212DocumentOwner:FredAhlstromCAUTION:Copyprintedon01/21/20.Validfordayofprinting.Page1of19ThreePhasePowerMeasurements:DiagnosticandTroubleShootingGuide1.0PURPOSEThe“ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuide”isintendedtoassistintheunderstandingofthreephasepowermeasurements,beareferenceforthecorrectinstallationofpowermeasurementinstrumentation,and,beusefulinthediagnosesofthecauseoferroneouspowermeterreadings.2.0APPLICABILITYThe“ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuide”documentdealswiththethree-phase,three-wire,two-meterpowermeasurementmethodthatisusedintheLaCrosselab.Workprocedure“L09-0198--Unitary–“RecommendedUseFor“AutomaticLoadSwitchBoxes”dealswiththeload-switch-boxwiringandtheinstallationofcurrenttransformers.The“ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuide”includesmuchofthesameinformationcontainedinL09-0198.Also,includedaresomeofourcommonpracticesregarding“phase”designations,colorscodes,andlabeling.Thedocumentisnotatechnicalpaper.However,itdoespresentsomeinformationintheformofvectoranalysisandcontainssometechnicaldefinitions.For“technical”information,theoreticalderivations,mathematical“proofs”,etcetera,refertoanygoodtextoncircuitanalysis.ForExample:“EngineeringCircuitAnalysis”byWm.H.Hayt,Jr.&JackE.Kemmerly(McGraw-Hill)Chapter12-6POWERMEASURMENTINTHREE-PHASESYSTEMS;p337-343providesagoodtheoreticalexplanationand“proof”ofthetwo-meterpowermeasurementmethod.Chapter15onMagneticallyCoupledCircuitsdealswiththetheoreticalbasicsofcurrenttransformers.3.0DEFINITIONS3.1NotApplicable4.0REQUIREMENTS4.1ThefollowingisalinktotheTroubleShootingGuidedocument.ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuide5.0RELATEDDOCUMENTS5.1L09-0198–Unitary–RecommendedUseFor“AutomaticLoadSwitchBoxes5.2ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuide6.0REVISIONHISTORYAnAmerican-StandardCompanyTraneCommercialSystemsEngineeringTechnologyEngineeringLaboratoryEffectiveDate:3/9/04LastRevised:3/08/04ProcedureNumber:L09-0212DocumentOwner:FredAhlstromCAUTION:Copyprintedon01/21/20.Validfordayofprinting.Page2of196.1RevisionA–3/8/04Page3of19ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuidePage3of19ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuideTABLEOFCONTENTS:I.INTRODUCTIONA.Purpose&ScopeB.ObjectivesII.COMMONPRACTICESA.ThreePhaseDesignationsB.ColorCodesC:CurrentTransformersSecondaryLeadsIII.WATTMETERWIRINGDIAGRAMSA.TwoCoilWattmeterMethodB.WT130ConnectionDiagramC.2505ConnectionDiagramIV.CURRENTTRANSFORMERSA.WestonType2andType5B.ITITopTapandPass-ThroughCTC.YEW_2241CTV.“BAD”METERREADINGSA.CurrentPhasesMixed-up.B.VoltagePhasesMixed-up.C.DiagramofVoltageandCurrentVectorsD.TroubleShootingTIPSVI.TROUBLESHOOTING:What’stheProblem?A.IsItaPhasingPROBLEM?B.ZeroornearzeroReadings.C.“Bad/Goofy”Readings.D.NegativePowerReadings.VII.APPENDIXA.VoltagePhaseShifts:B.CurrentPhaseShiftsC.WattmeterPowerReadingD.Line-VoltageandLine-CurrentVectorsE.PowerMeterVoltageandCurrentVectorsByFredAhlstromDate:Feb27,2004Page4of19ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuidePage4of19I.INTRODUCTIONA.Purpose&Scope:This“TroubleShootingGuide”isintendedtoassistthereaderintheunderstandingofthreephasepowermeasurementsandbeaguidetohelpdeterminepossiblecausesoferroneouspowermeterreadings.Thisdocumentdealswiththree-phasepowermeasurementsusingthethree-wire,two-metermethod.ThemethodgenerallyusedbytheLaCrosselaboratory.WorkprocedureL09-0198--Unitary-RecommendedUsefor“AutomaticLoadSwitchBoxes”coverstheload-switch-boxwiringandtheinstallationofcurrenttransformers.This“TroubleShootingGuide”includesmuchofthesameinformation.Thoughsometechnicaldefinitionsandinformationonvectoranalysisispresented,thisdocumentisnotatechnicalpaper.Ifyouarelookingfortechnicalinformation,theoreticalderivations,mathematical“proofs”,etc.,thenrefertoanygoodtextoncircuitanalysis.ForExample:“EngineeringCircuitAnalysis”byWm.H.Hayt,Jr.&JackE.Kemmerly(McGraw-Hill)Chapter12-6;POWERMEASURMENTINTHREE-PHASESYSTEMS;p337-343providesagoodtheoreticalexplanationand“proof”ofthetwo-meterpowermeasurementmethod.Chapter15onMagneticallyCoupledCircuitsdealswiththetheoreticalbasicsofcurrenttransformers.B.Objective:Theobjectiveofthisdocumentistoassistyouinunderstanding,diagnosingandtroubleshooting“bad”wattmeterreadings.Also,someofourcommonpracticesandmethodsaredocumented.Thebestwayto“troubleshoot”isto“DoitRighttheFirstTime”.“Phasing”problemsareoftenthecauseof“Bad”powermeterreadings.Thisdocumentcanbeusedasareferenceguideforthecorrectinstallationofcurrenttransformers,andasaguidetoverifycorrectpowermeterwiring.Page5of19ThreePhasePowerMeasurements:DiagnosticsandTroubleShootingGuidePage5of19II.COMMONPRACTICESA.ThreephasedesignationsTypically,thethreeleads,inthree-phase,three-wirepowersystemsarereferredtoasLine-A,Line-B,Line-Corleg-A,leg-B,leg-C,orphase-A,phase-B,phase-C.Lineorl
本文标题:Three Phase Power Measurements
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