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Db复小波在超高频局部放电测量中的应用(英文)
Title:TheApplicationofWaveletTransforminUHFPartialDischargeMeasurements
Abstract:
Partialdischarge(PD)isacommonphenomenonthatoccursininsulationsystems.Itisoftenanearlyindicationofinsulationdegradationandcanleadtofailuresinelectricalequipment.TodetectanddiagnosePDaccurately,reliablemeasurementtechniquesarerequired.Inrecentyears,theuseofultra-high-frequency(UHF)measurementshasgainedpopularityduetoitscapabilitytodetectPDsignalswithhighsensitivity.ThispaperaimstoinvestigatetheroleofwavelettransforminUHFPDmeasurementsanditsapplicationinenhancingtheaccuracyandeffectivenessofPDdetectionandanalysis.
1.Introduction:
Partialdischargeisalocalizedbreakdownofinsulationmaterialsinhighvoltagesystems,primarilycausedbyimperfections,aging,ormechanicalstress.PDmeasurementsprovidevaluableinformationabouttheconditionofinsulationsystemsandcanhelpidentifypotentialfaultsbeforetheyleadtocatastrophicfailures.Ultra-high-frequency(UHF)PDdetectionisanon-intrusive,onlinemonitoringtechniquethathasshownpromisingresultsindetectingPDactivity.ThispaperexplorestheadvantagesandchallengesassociatedwithUHFPDmeasurementsanddiscusseshowwavelettransformcanimprovetheaccuracyofPDanalysis.
2.UHFPartialDischargeMeasurementSystem:
TheUHFPDmeasurementsystemconsistsofaUHFantenna,areceiver,andsignalprocessingcomponents.TheUHFantennaisdesignedtocaptureelectromagneticwavesgeneratedbyPDevents.Thereceiveramplifiesandfiltersthecapturedsignals,andtheprocessedsignalsareanalyzedusingvarioustechniques.TheUHFmeasurementsystemprovideshighsensitivityandnoiseimmunity,makingitsuitablefordetectingPDactivitiesinhighvoltageequipment.
3.WaveletTransform:
Wavelettransformisamathematicaltoolthatdecomposesasignalintoitsfrequencycomponents.Ithasbecomeapopulartechniqueinsignalprocessingduetoitsabilitytoanalyzesignalsinbothtimeandfrequencydomainssimultaneously.WavelettransformoffersseveraladvantagesoverconventionalFourieranalysis,includinglocalizationintimeandfrequency,multi-resolutionanalysis,andvariabletime-frequ