1,2,3(1.7500012.0710033.750001):。。:;;:TM406:B:1001-8425(2009)02-0062-05TransformerFaultDiagnosisandTrendPredictionBasedonAcousticProcessingPANQing-qing,ZHAOShu-tao,PANLiang-liang(1.YinchuanPowerSupplyBureau,Yinchuan750001,China;2.NorthChinaElectricPowerUniversity,Baoding071003,China;3.EHVBranch,NingxiaElectricPowerCompany,Yinchuan750001,China)Abstract:Anacoustictestmethodispresented.Thetransformerfaultsarediagnosedandthetrendispredictedwiththemethod.Keywords:Transformer;Signalprocessing;Waveletanalysis1,、。(20kHz~1011Hz)[1-5],,。,,,。(20Hz~20kHz)[6-7]。,“”,,,。,()。,,,、。,、。21,。,,、,、,,:,。33.146220092TRANSFORMERVol.46FebruaryNo.22009、、2CHZ(3Hz~18kHz)10kV,2a。2b,50Hz~70Hz、300Hz~320Hz、400Hz~420Hz、450Hz~470Hz。,。,,,[8],、,,。3.2“”,,[9-13]。,。(1),n。:Cj+1,2m(k)=nΣCj,m(n)h(n-2k)Cj+1,2m+1(k)=nΣCj,m(n)g(n-2kΣΣΣΣΣΣΣ)(1)(2)()。,。(3),。(4)n,。:Cj,m(k)=nΣCj+1,2m(n)h(k-2n)-nΣCj+1,2m+1(n)g(k-2n)(2)。,,。,MATLABddencmp()wdencm(),3。3,,,,;,,,。4、4.1,———,,。,21Fig.1Diagramofdiagnosisandtrendpredictionoftransformerfault200-201000200030000(a)t蛐ms01002003004005004×1042×10406×104f蛐Hz(b)Fig.2Time&frequencywaveformoftransformersoundwave6346,。,。1x(t)[a,b]lips-chitzα,K>0,x∈[a,b],:WT2Jx(t)≤K×2jα(3),:log2WT2jx(t)≤log2K+jα(4)(4)jlipschitzα。α>0,j;α<0,j;α=0,j。:,,,。,,4。4,,,;db1,(4800≤5000)。,,db1,。,,。4.2,,。,,,,,。5a,;5b();5c200-200100020003000t蛐ms(a)200-200100020003000t蛐ms(b)200-200100020003000t蛐ms(c)3Fig.3Noiseeliminationoscillogram2000-200050001000005001000150020001000005000100000500010000050001000005000100002000-200500-501000-1002000-2004t蛐msFFTd1d2d3a3Fig.4Singularitydiagramofsignal64、、2。,,。、,。db5100,,5d、5e5f。,,。5e,,,,,“、、、、、”。5f,5a,,。4.3、。-;,,。,,,。。(1)n,n2n(M)。(2),。:X1,X2,…,XM 。(3)。EjXj,:Ej=乙Xj2dt(5)(4)。T:T=[E1,E2,…,EM](6),,,。5。,200-2002004006008001000t蛐ms(a)200-2002004006008001000t蛐ms(b)200-2005001000t蛐ms(c)20-2020406080100(d)20-2020406080100(e)20-2050100(f)5Fig.5Identificationandanalysisdiagramofchar-acteristicsignals6546、。,,。:[1],,.[J].,2007,33(1):165-168.[2],,,.[J].,2004,24(8):48-52.[3],,,.[J].,2005,25(3):110-113.[4],.[J].,2003,22(2):51-54.[5],,.[J].,2004,30(7):34-36.[6].[J].,2005,21(6):78-79.[7]VartolettiC,DesiderioM,DiDCarlo,etal.Vibro-a-coustictechniquestodiagnosespowertransformers[J].IEEETrans.PowerDeliv.,2004,19(1):221-229.[8],,,.[J].,2000,20(10):46-54.[9],,,.[J].,2002,24(1):58-60.[10],,,.[J].,2002,22(8):53-56.[11]RoyN,PurkaitP,BhattacharyaK.ApplicationofwaveletandFouriertransformforvibrationanalysisofmotor[C].IEEEInduction2005conference,Chennai,India,2005,609-613.[12]KangPJ,BirtuhistleD.Conditionassessmentofpowertransformeron-loadtapchangersus-ingwaveletanalysisandself-or-ganizingmap:fieldevaluation[J].IEEETrans.PowerDeliv.,2003,18(1):78-84.[13],,,.[J].,2006,32(7):49-53.[14],,.[J].,2005,25(22):158-162.[15],,.[J].,2005,42(6):6-9.[16],,,.MATLAB6.X[M].:,2004.:2007-08-23:(1978-),,,;(1968-),,,,、。!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!,2,,“”、“64”,,,。:[1],.[M].:,1998.[2].[J].,2005,31(6):80-83.[3],.[J].,2007,44(8):64-65.:2008-05-13:(1977-),,,,。2蛐℃蛐Ω蛐Ω蛐Ω蛐Ω1021.90.11465.80.20.1518109.90.1221414.20.2261817.90.1302221.80.2Table2Matchedresistancesafterparameteradjustment(61)66