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1、958IEEETRANSACTIONSONINDUSTRYAPPLICATIONS,VOL.36,NO.4,JULY/AUGUST2000Locked-RotorandAccelerationTestingofLargeInductionMachines—Methods,Problems,andInterpretationoftheResultsJ.H.Dymond,SeniorMember,IEEE,RaymondOng,Member,IEEE,andPeterG.McKennaAbstract—Themeasu
2、rementoflocked-rotorcurrent,torque,associatedwiththemeasurementofthetorque,current,andandpowerfactorhasbeenastandardtestforinductionmachinesspeedpointsforthespeed–torqueandspeed–currentcurves.formanyyears.MeasurementoftorquehasevolvedfromusingThepurchaserexpec
3、tsthequotedlocked-rotortorquetobeabrake,adynamometer,atorquearm,andscale,throughstrainthevalueseenattheshaft.Formediumandlargemachinesgaugesandloadcellstoaccelerationtests.Thetestmustbeofshortdurationtopreventdamagetothemachineandlargema-withsleevebearingsandi
4、nthecaseofverticalmachineswithchinespresentproblemsbecauseoffacilitylimitationsineitherplate-typethrustbearings,thebearingfrictionatlowvoltagekilovoltampereortorquemeasurement.Asingletestatreducedtestsreducesthevalueofshafttorquemeasured.Thiserrorisvoltagewhen
5、proratedtooperatingvoltagebythesquareoftheamplifiedwhenthevaluesareproratedtofullvoltageconditionsratioofratedvoltagetotestvoltageneglectstheimpactofsatu-bythenormalsquarelawmethodwhichisappliedwhenonlyrationandresultsinsignificantlylowervaluesofpredictedtorqu
6、eandcurrent.Thispaperdiscussesseveralmethodsfordoingtheonelocked-rotortestatreducedvoltagehasbeenmade.Like-locked-rotorandthespeed–torquetestsonlargemachines.Italsowise,ifthetorqueiscalculatedfromthepowerinputlessthediscussessomeoftheproblemsassociatedwiththet
7、estmethodsironlosses,thefundamentalstrayloadloss,andthestatorandshowshowthetestscanbeperformedandtheresultsevalu-losswithoutincludingthefrictioninthebearingandtempera-atedtoaccountforsaturationeffects.Finally,thepapershowshowtureeffects,theresultingvalueisthet
8、otalmotorairgaptorquetoextractsomemachinecircuitparametersfromthetestdata.whichisnottheshafttorque.Hence,refinementstothecalcula-IndexTerms—Current,lockedrotor,power,saturation,sub
