基于变压器噪声的硅钢片状态检测方法分析-analysis of silicon steel sheet state detection method based on transformer noise.docx

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基于变压器噪声的硅钢片状态检测方法分析-analysis of silicon steel sheet state detection method based on transformer noise.docx

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基于变压器噪声的硅钢片状态检测方法分析-analysis of silicon steel sheet state detection method based on transformer noise

AbstractTransformeristhemostimportantinstallationinpowersystem,butthephenomenonofusingsecondusedsteelintransformermanufactureappearsrecentyears,causingpotentialqualityproblems.Thesecondusedsteelisunloadfromeliminatedtransformers,andusedincoreproductionafterreworking.Currentlynoeffectivemethodofsteelstatedetectionisobtained.Transformersoundisgeneratedinoperation,whichismainlycausedbythevibrationofthecore,sothetransformersoundisdefinitivelyinfluentbythesteelstate.Iftherelationbetweentransformersoundandsteelstatewasrevealed,themethodofsteelstatedetectionbasingonsoundcanbeobtained.Therelationbetweentransformersoundandmagnetostrictionofsteelisstudiedinthisthesis.Thetheoreticanalysisoftransformersoundrevealsthatthesoundismerelydecidedbythemagnetostrictionofsteelwhentheoperationstate,capacityandmaterialoftransformersaresimilar.Therelationbetweensteelstateandmagnetostrictionisobtainedbytheoreticanalysisofmagnetostrictionandthesecondusedsteel,revealingthatthesoundcanresponsethedifferencebetweensteelstatesbecauseofthedifferenceinmagnetostriction.Thetransformersamplesareselectedinsamecapacityandmaterial,butindifferentsteelstatesinexperiment,theplatformofsoundrecordandanalysisisestablished,thesoundofsamplesarerecordinno-loadtest,thedifferencebetweensoundsisanalyzedinfrequencydomain.Thenthetransformerismodeledinmulti-physicssimulationsoftware,thesimulationinmulti-physicsisstudiedindifferentmagnetostrictionofcore,andthedifferencebetweensoundsisanalyzedinfrequencydomain.Theresultofexperimentstudyindicatethattheolderthesample，thehigherthefundamentalfrequencycomparingtotheharmonicinsoundsignal.Theresultofsimulationstudyindicatethatthelargerthemagnetostriction,thehigherthefundamentalfrequencycomparingtotheharmonicinsoundsignal.Accordingtotheoreticalanalysis,experimentstudyandsimulationstudy,magnetostrictionisinfluentbysteelstate,thebetterthesteelstateis，thehigherthefundamentalfrequencycomparingtotheharmonicintransformersound.Thestudyresultismeaningfultothemethodofsteelstatedetectionu