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GIS局部放电超高频信号传播特性和模式识别的研究.docx

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GIS局部放电超高频信号传播特性和模式识别的研究 GIS局部放电超高频信号传播特性和模式识别的研究 Abstract Withtheincreasingdemandforthereliabilityandsafetyofpowergrids,thedetectionanddiagnosisofGISpartialdischarge(PD)hasbecomeanimportantresearchtopicinrecentyears.Inthispaper,wefocusonthepropagationpropertiesandpatternrecognitionofultra-high-frequency(UHF)signalsgeneratedbyGISPD.Firstly,thepropagationmechanismsofUHFsignalsinGISareintroduced,followedbyadiscussionofthefactorsthataffectthepropagationofUHFsignals.Then,thefeatureextractionandpatternrecognitiontechniquesforUHFsignalsarepresented,andtheclassificationmethodsusedforpatternrecognitionarealsointroduced.Finally,futureresearchdirectionisproposedtopromotethedevelopmentofGISPDdetectiontechnology. Keywords:GIS,partialdischarge,ultra-high-frequency,propagationmechanism,patternrecognition Introduction Gas-insulatedswitchgear(GIS)iswidelyusedinpowersystemsduetoitsadvantagesofcompactsize,highreliability,andlowmaintenance.However,GISispronetopartialdischarge(PD)underhigh-voltagestress,whichcancauseinsulationdegradation,equipmentfailure,andevenaccidents.Therefore,PDdetectionanddiagnosishavebecomeanimportanttopicinpowersystemresearch. UHFsignalsgeneratedbyGISPDhavethecharacteristicsofstrongdirectivity,lowattenuation,andgoodanti-interferenceperformance,whichmakeitasuitablemethodforonlinePDdetectionanddiagnosis.TheUHFsignalsgeneratedbyGISPDarewidelyusedinthedetectionofGISPD.Therefore,understandingthepropagationcharacteristicsandpatternrecognitionofUHFsignalsisofgreatsignificanceforimprovingthedetectionaccuracyandreliabilityofGISPD. PropagationscharacteristicsofUHFsignalsinGIS ThepropagationofUHFsignalsinGISisaffectedbythestructureoftheGISequipment,thecharacteristicsoftheUHFsignals,andtheexternalelectromagneticenvironment.TheelectromagneticwavegeneratedbyPDinGISmainlyhasthreepropagationmodes:surfacewave,waveguidemode,andcavityresonance. SurfacewavepropagationoccurswhentheUHFelectromagneticwavepropagatesalongthesurfaceoftheGISenclosure.Ithasthecharacteristicsoflowattenuati