高压介损测试仪 TD Smart

®TDSmartDissipationFactorMeasurementsDobleLemke,November2010DissipationFactorMeasurement®Abstract•TD-SmartFundamentalsSchematicDiagrams2DissipationFactorMeasurement®•Introduction–DissipationFactor(DF)–DielectricDissipationFactor(DDF)–Capacitance&TangentDelta(C&tanδ)–DielectricLossAngle(DLA)–CharacteristicACImpedanceMeasurement...alldescribethesamediagnosticmethod•Measurementby:–ScheringBridge(analog)–CurrentSensors(digital)→DFbyDSP3DissipationFactorMeasurementsDissipationFactorMeasurement®•ComparisonDFPD–DF:•IntegralInsulationQuality•GlobalInsulationPerformance•Long-termAgeing–PD:•LocalInsulationQuality•Location-selectiveInsulationPerformance•ViolentImpactDegradation4DissipationFactorMeasurementsDissipationFactorMeasurement®•Basics(I)TheDissipationFactor(DF)istheratiobetweentheresistivepowerlossandthereactivepowerlossoftheinsulationmaterial:5DissipationFactorMeasurementsDissipationFactorMeasurement®•Basics(II)TheDissipationFactor(DF)measuredatthelowvoltageisanindicatorof:-Inherentdielectriclossesoftheinsulationanditsgeneralcondition-Moisturecontentandthedegreeofcleanliness-Degreeofcuringofthematerials6DissipationFactorMeasurementsDissipationFactorMeasurement®•Basics(III)ADissipationFactorismeasuredbyincreasingfromalowtestvoltage(0.24Un)toahighervalue(1.0Un)andisanindicatorof:-Voidcontent(gasinclusions)oftheinsulation-Anypartialdischargesdamagetotheinsulation-Continuityandconditionofstresscontrolcoating7DissipationFactorMeasurementsDissipationFactorMeasurement®•ConventionaltanMeasurementScheringBridgeC1=CN*R4/R3R1=C4/CN*R3tan1=R4**C4Iftestobjectisnotearthed,thenthemeasurementbecomesquitecomplicated8DissipationFactorMeasurementsDissipationFactorMeasurement®•Non-ConventionaltanMeasurement–Nonbalancingnecessary–Groundedtestobjectscanbetestedeasily–DatatransmissionwithfiberopticlimitsEMCproblems–DerivationofvaluesforCandtanfrommeasurementofthephaseanglebetweenthevoltagesinbothlowvoltagearmsofthebridge–Resistivecomponentsinthelowvoltagearminsteadofcapacitivecomponents=eliminationerroneousinfluencesbystraycapacitances9DissipationFactorMeasurementsDissipationFactorMeasurement®•HardwareConceptandMeasuringPrinciple10TDSmartNoBalancingforbridgeadjustmentDissipationFactorMeasurement®•MeasuringPrinciple–FundamentalSchematic11TDSmartExtensionshuntsareoptionallyavailable,e.g.5Ampsand25AmpsDissipationFactorMeasurement®•SoftwareConcept(TrendTabViewforReporting)12TDSmartTrendGraphsReportingDissipationFactorMeasurement®•Benefits/Features–SignalAcquisition,-Amplifying,-Digitizationcompletelyinthesensors–Potentialfree,optical,digitaldatatransmission(easymeasuringofgroundedtestobjects)–Frequencyindependentandfrequencyselectivemeasurement–Extremelywidecurrentmeasuringrange–Fastpolarizationprocessescanbecaptured(continuousmeasurementwithoutbridgebalancing)–Windowsbasedusersoftware–Realtimedisplayofallmeasuredcharacteristics(graphicallyandtabularscheduled)–Completeremotecontrolofthemeasuringsystemandtestset-upembedmentpossible13TDSmartDissipationFactorMeasurement®•TechnicalData–SensorUnits14TDSmartDissipationFactorMeasurement®•TechnicalData–SystemData15TDSmartDissipationFactorMeasurement®•TechnicalData–SoftwareRequirements16TDSmartDissipationFactorMeasurement®•OperatingElements–HostBox17TDSmartDissipationFactorMeasurement®•OperatingElements–ReferenceSensor18TDSmartDissipationFactorMeasurement®•OperatingElements–MeasuringSensor19TDSmartDissipationFactorMeasurement®•OperatingElements–Shunt(optional)20DissipationFactorMeasurementsDissipationFactorMeasurement®•OperatingElements–ElectrodesKit(optional)21DissipationFactorMeasurements–FormeasurementsonHVpotential–CompactarrangementformeasuringsensorandshuntDissipationFactorMeasurement®•UngroundedSpecimenTest(UST)22TDSmartDissipationFactorMeasurement®•UngroundedSpecimenTest(UST)–withShunt23TDSmartDissipationFactorMeasurement®•GroundedSpecimenTest(GST)24TDSmartDissipationFactorMeasurement®•GroundedSpecimenTest(GST)–withShunt25TDSmartDissipationFactorMeasurement®•TanDelta-MeasurementsonStatorBars(I)–UngroundedSpecimenTest(UST)with/withoutGuard-Electrodes26TDSmartDissipationFactorMeasurement®•TanDelta-MeasurementsonStatorBars(II)–GroundedSpecimenTest(GST)withoutGuard-Electrodes27TDSmartDissipationFactorMeasurement®•TanDelta-MeasurementsonGenerators(I)–Starpointcanbeopened28TDSmartDissipationFactorMeasurement®•TanDelta-MeasurementsonGenerators(II)–Starpointcannotbeopened29TDSmartDissipationFactorMeasurement®•Applicationsareas/CaseStudies(I)TDSmart:Setupinatestlaboratory30TDSmartDissipationFactorMeasurement®•Applicationsareas/CaseStudies(II)TDSmartmeasurementsonStatorwindings:BrushintheNetherlands31TDSmartDissipationFactorMeasurement®•Applicationsareas/CaseStudies(III)SetupoftheTDtestcircuitonaStatorwindingincluding:–Stator–TDSmart–StandardCapacitor–CouplingCapacitor–Fiberopticcables32TDSmartDissipationFactorMeasurement®•Conclusion–Benficialcompleteelectricalinsulationthroughfiber-opticconnections–superiorsafetyinhighvoltagetestsetups–High-resolutiondigitalprocessingenablesexceptionalm