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(404000):,,。:;;;:TM406:B:1001-8425(2009)01-0022-05MoistureMonitoringofTransformerPressboardDryingProcessLIWan-quan(ChongqingThreeGorgesUniversity,Chongqing404000,China)Abstract:Thepricipleofthecapacitivesensorisintroduced.Therelationbetweenthesensordielectricsignalandmoisturepercentofpressboardisprocessedstatistically.Theexpressionofmoistureconcentrationduringthedryingprocessispresented.Keywords:Transformer;Pressboard;Moisture;Model,。,,。,。,。,,。、、、、、。。,、。,,1。2蛐5。。,。,Mφ,εσ,。1Fig.1CapacitorsensorTRANSFORMERVol.46JanuaryNo.120092。l,b,a,εx,εb,,Cx:Cx≈2.2(εx+εb)·K0·lπln(a+2ba)(1)K0———,σx,σb,,Gx:Gx≈2.2(σx+σb)·K1·lπln(a+2ba)(2)K1———,。εi,di,Ci:Ci=εilbdi(3)Y:Y=2.2(jωC+G)jωCjω(C+2Ci)+Gi(4)ω———,,,。,。,,,、,,,3。fick。3.1,、,,。、,,,,,。,,。鄣m鄣t=Dx鄣2m鄣x2+Dy鄣2m鄣y2(5),DxDyxy,。5:(1);(2),;(3);(4);(5)。,,。,,xy,Dx=Dy。:鄣m鄣t=Dx(鄣2m鄣x2+鄣2m鄣y2)(6)2a、2b。xy,,x=a、lba2Fig.2Diagramofelectrodeinsensor3Fig.3Twodimensionalwaterdiffusiondiagraminpressboard23x=-a、y=b、y=-b。,,:m(x,y,0)=m0-a<x<a,-b<y<b(7)m0。,。,,。mn,。,、,。,,:m(-a,y,t)=m(a,y,t)=mn(8)m(x,-b,t)=m(x,b,t)=mn(9)x=0、y=0,:鄣m鄣x|x=0=0(10)鄣m鄣y|y=0=0(11)、,,。,(6)~(11)。3.2(8)(9),mn,u(x,y,t)=m(x,y,t)-mn,:鄣u鄣t=D(鄣2u鄣x2+鄣2u鄣y2)0<x<a,0<y<b,t>0u(x,y,0)=m0-mnu(a,y,t)=0u(x,b,t)=0鄣u鄣x|x=0=0鄣u鄣y|y=0=鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣鄣0(12),:m(x,y,t)=mn+∞n=0Σ∞k=0Σcnk·cos(2n+1)πx2a·cos(2k+1)πy2b·(13)exp-(2n+1)2b24a2b2+(2k+1)2a24a2b222π2D22tcnk,:cnk=16(-1)n(-1)k(m0-mn)(2n+1)(2k+1)π2n=0,1,2,…k=0,1,2,…,,。fick,,,;,,,,,。,,fick,,,,,,。,85mm×59mm×15mm、8%,,110℃。,,。,,。,。,,10mg。,。,,,(4)。Mm,,:m=a-b·cM,%(14)a、b———24,、。,。,。,5。138h,,,0.028,,。,0.038%,0.01%。(13)。,6。,,0.205%,,0.3%,。,,。,。,。,,。,。,,,。:[1],.[J].,2001,(5):62-63.64200.20.40.60.81.01.21.41.6M蛐%4Fig.4Curveofwatercontentsandgainofpressboard0.200.150.100.050.0001020304050-30-25-20-15-10-50蛐mm蛐%蛐mm6Fig.6Twodimensionalwaterdistributioninpressboard42020406080100120140M蛐h5、Fig.5Curvesofamplitudegain,phaseangleandwatercontentinmeasurementduringdry-ingprocessofpressboard-10-20-30-40-50-60-70-80020406080100120140φ蛐h8642020406080100120140蛐%蛐h(70)25,,,10-2,,。3,4,BP。,。,BP。:[1]DL蛐T722-2000,[S].[2].[M].:,1993.[3],.[J].,2002,17(1):25-29.[4],,.[J].,2000,19(1):22-26.[5],.[J].,2002,18(4):36-38.[6],.[J].,2005,18(2):235-236.[7].、[M].:,2002.110110010-110-210-310-4040008000120001600020000Fig.1Networktrainning3CH4H2C1+C2C2H2115.320150118.5500001212.848015099.23000013268510848.0000010457.5415546.44810.0001000Table3Databasemodelofsamples4000010.00400.00100.9920000100.0010.00200.992000100.00700.0060.9930.0140100000.97800.0120Table4Resultsandcomparisonofnetworksimulation:,0。:2007-11-19:(1979-),,,,;(1978-),,,,、。[2].[J].(),2003,24(2):184-188.[3].[J].,2003,39(4):104-107.[4],.[J].,1997,15(4):359-362.[5].[M].:,2001.[6].[M].:,2004.[7].[M].:,1992.:2008-02-27:(1968-),,,,。(25)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!70
本文标题:变压器绝缘层压板干燥过程微水分检测
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