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:2003-09-24:(1954-),,,,;(1979-),,,,。Re#e$%&’()*+,-)(#+#(./(0e%1%,)#.(%2e%3+)4+)-*e.(%2,5+()6789:!#$%&’(&);*+#,&%-’.&;*+/012&%3’(&(1.WuhanUniversity,Wuhan430072,China;2.WuhanHighVoltageResearchInstitute,Wuhan430074,China):6#5%,&5:Theprincipletodiagnosetransformerwindingdeformationbyfrequencyresponseanaly-sis(FRA)isdiscussed.Themethodtocalculatewindinginductanceandcapacitanceispresented.Itsreliabilityisverified.=e70(%4#:!#$%&%’()*%+,%;-%,./,(01%,)2(),3(’41)5);65(75(8;9,*%+’&5(!!!!!!##:,,º:;;;;:TM835:B:1001-8425(2005)10-0026-05!(PD)。。[1],。、,。,[2],,。,,。,,,。,,。Mallat1992,[3]。[4、5],。,==============================================!#$$$%#$19:?8@9AB9&’()!*+,’-./0’)#$$$%!!!10。,;,,,。,。,,。,,。!!(t),!#$(t)=1!!(t%&)(1)’(t),&:(’(&)=1!’(t)!(t%&)dt(2)!(t):)()=+∞!()2d∞(3)=2*,(*)’(t)2*&:+2*(&)=12*!’(t)#(t,&2*)dt(4)--2.’.’(t);’,。/01203;45678,。:,。9:;;/(012)。9:;;/(012)=/13=#+(04312)(=),0,20,2,/(0567/+1),8。/=2。9:;;2(092)=-(0,2)-(0+1?2)(7):(1)9:;;2(012)(2)9:;;2(012)-(0,2),@AB9:;;2(012):@AB9:;;2(012)=9:;;2(012):-(0):-C:;;(0)!(D),:-C:;;(0)=;2=1$9:;;2(012)2(E):-(0)=;2=1$-(012)2(F)(3)@AB9:;;2(012)-(012)。@AB9:;;2(012)G-(012),2,-(012)-3AB(012),-(012)9:;;2(012);,2,-(012)9:;;2(012)。(4)2,3,:-(0)。,。,;,。,,,。$,$$0。3,0@AB9:;;2(012)%-(012),:-(0)(1)!0。:-(0)(1)!$0,%=:-(0)(1)!$0。&G1,,;&1,-(012),。#(H'1;:5IJKL;01MN)!421A!tro&’Fig.1DeompositionourseofA3trous456orit7m(A!tro&’8i6.9:;onstrutionours;o=A3trous56orit7m,Mallat。,,。,,,。1()。2A'trous。H(zp)h(k)p-1。!。,,。。y=Ap×sin(2!f*+)×,-+.(11),f*=500kHz,.=2us,/p=5;6.67MHz,1024。。3,3a,。3b,)*+,-)*+.tr/t+o0tr1/t210to3’+2&./t+o04/t/!!!!104Fig.4NoiseeliminationofPDwithfilter(d),,SNR=-7.28db。3c,,SNR=3.22db。3d:SNR=8.56db;,。3,,,。。,6.67MHz,10ms。4,4a,,;4b;4c;4d。4a4c,,;4b4d,,。,。,,。,,,,,,,,。!,,,。,。:[1],,,.[J].,1993,3(4):215-218.[2],,.[J].,1999,19(4):23-27.[3]MallatS,HwangWL.SingularitydetectionandproPcessingwitQwaRelets[J].STTTUrans.SnVorm.UQeory,1992,8W2):617-643.!!!#$$##!,、、。,、GIS,,,。,,,,。,。、,、GIS、。!#$$$%#$!#$%&’()&’()!*+,’-./0’)#$$$%#**+,-./,01023.45+5/!6.1720689.75:01%*./,.++;%5+5-/,45$0,75,+/6./,01/03=,/50,75%?**6577,01,1!6.17206856@.6/,.+A,7-=.6B5!#$%&’()*+,#-./0123’4)2+5#$!012’6)+!#-.%*’3&23(ShanghaiJiaotongUniversity,Shanghai200240,China)CD7/6.-/:Themethodtosuppresswhitenoiseintransformerpartialdischargebywavelettrans-formbasedonspatiallyselectivenoisefiltrationisgiven.TheemulationandPDsignalsarecal-culated.TheresultsshowtheeffecttosuppresswhitenoiseintransformerPDsignalsisbetter.E5;F06:7:!#$%&’();*+,)-)..+$%&’(;/'.’0%+-1’2.3(;45;67+.2+-8%)-)9.2,)$’2%)&2-.+.2’$:2003-09-09:(1979-),,,;(1970-),,,,;(1979-),,,;(1971-),,,。[4],,.[J].,1998,24(1):71-75.[5],,.[J].,2002,28(12):8-10.[6]SunxuY,JohnB.Wavelettransformdomainfilters:aspatiallyselectivenoisefiltrationtechnique[J].IEEETrans.ImageProces.,1994,3(6):747-758.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!