XLPE电缆局放脉冲频谱分析及传感器选频

XLPE,,,,(,710049):,(XLPE),XLPE,0171,XLPE5m,16819MHz,MHz:XLPE;;;;:TM855:A:100326520(2006)0720036203SpectrumAnalysisofthePartialDischargePulsesinXLPECableandFrequencyBandSelectionofSensorsZHUJundong,YANGLiandian,JIAJiangbo,YANGLanjun,ZHANGQiaogen(SchoolofElectricalEngineering,XianJiaotongUniversity,Xian710049,China)Abstract:Theexponentialattenuationfunction,trapezoidalfunction,Gaussianfunctionandcircularfunctionareusedtodescribethepartialdischarge(PD)pulsesinXLPEcables,andtheupperfrequencylimitofthePDpulsesisanalyzedquantitatively,whichmatcheswellwiththatofthedetectedPDpulsesafterFFT.Theleastsquarestech2niquesareusedtofittheattenuationcharacteristicsofdifferentfrequencycomponentinXLPEcablesandthebestexpressionisgiven.Consideringratiooftheoutputsignalsmagnitudeandtheinputsignalsmagnitudefrom0.7to1asthefocusenergyrangeofthePDpulses,thebandwidthofsensorsisadvisedinthispaperwhendetectingthepar2tialdischargeofXLPEcablewithdifferentlength.Fora52meter2longcablejoint,theupperfrequencylimitofsen2sorsshouldbenotlessthan168.9MHzandthebandwidthisseveraltensMHzwhenPDismeasuredinlongerca2bles.Keywords:XLPEcable;partialdischargepulses;spectrumanalysis;sensor;frequencybandselection0[125][426]XLPE,,11,(a)(b)(c)(d),ns,ns300MHz[7]XLPE,015m,4FFT20010070100MHz1Fig11Spectrumdistribution,,2x(t)=I0e-t/T1(t);6332720067HighVoltageEngineeringVol.32No.7July2006x(t)=I0/2(2+3+t)(-2-3t-3)I0(-3t3)I0/2(2+3-t)(3t2+3);x(t)=I0e-t2/(22);x(t)=I0/4(4+t)(-4t0)I0/4(4-t)(0t4);,I0,1,23()(,)(),,4(),0X(j),=2f,rad/s,f|X()|=I01/1+221,|X()|=2I0(cos3-cos((2+3)))/22,|X()|=I02e-22/2,|X()|=2I0(1-cos4)/24X0()=|X()|/lim0|X()|4:X0()=1/1+221,X0()=2(cos3-cos((3+2)))232(2/3+2),X0()=e-22/2,X0()=2(1-cos4)/22424Fig12Normalizedamplitudefrequencycharacteristicsoffourtypicalpartialdischargesimpulsefunction24-3dB,24-3dB:a.=1.019,b.=0.845,c.=0.874,d.=2.018,=2f,1,1a=1ns,fh16212MHz;2b=1ns,k=1,fh=134.5MHz;3c=2ns,fh=69.6MHz;4d=3ns,fh=107.1MHz,16212MHz3l[8]:F()=X0()e-()L,()=()+j(),()=/v,,X();(),[9];(),();v=01198m/ns,,(),AWG2021100Hz100MHz6mXLPE,(37)35,TDS30523a,b:(f)=a0f+a1,(f)=a0f2+a1f+a2,,ai(i=0,1,,n)3,,matlab,:(f)=-10-4f2+10-4f+2.7303,()=-(10-4/42)2+(10-4/2)+2173033Fig13Attenuationcharacteristicsofcabletestsamplel40171,5m10m,16819MHz12116MHz,7320067327,50100250m,561740182619MHz,4Fig14Transfercharacteristicsofcablesofdifferentlength4,FFT,,e,0171,,16819MHz,,MHz[1]StevenA.NoggsPartialDischarge:Overviewandsignalgeneration[J].IEEEElectricalInsulationMagazine,1990,6(4):33239.[2]PommerenkeD,StrehlT,HeinrichR,etal.Discriminationbetweenin2ternalPDandotherpulsesusingdirectionalcouplingsensorsonHVcablesystems[J].IEEETransonDEI,1999,6(6):8142824.[3]AhmedNH,SrinivasNN.On2linepartialdischargedetectionincables[J].IEEETrans.onDEI,1998,5(2):1812188.[4],,1XLPE[J].,2004,30(7):37239.[5],,135kVXLPE[J].,2000,24(12):58261.[6],,1XLPE[J].,2004,30(4):28230.[7],,,1VHF110kVXLPE[J].,2004,30(7):37239.[8],,,1[J].,2003,24(5):5202524.[9],1Rogowski[J].,2005,31(11):627.[10],,1Rogowski[J].,2003,40(453):12215.[11]TianY,LewinPL,DaviesAE.PartialDischargedetectionincablesu2singVHFcapacitivecouplers[J].IEEETransonDielectricsandElectri2calInsulation,2003,10(2):3432353.[12],1XLPE[J].,2004,28(4):26228.[13],,1[J].,1999,25(4):15220.[14],,,1GIS[J].,2005,25(17):1502155.[15]Du.Z.PerformanceLimitsofPDLocationBasedonTime2domainRef2lectometry[J].IEEETransonD&EI,1997,4(2):1822188.[16]SteinerJP,ReynoldsPH,WeeksWL.Estimatingthelocationofpar2tialdischargesincables[J].IEEETransonEI,1992,27(1):44259.1980,,,:[phone];E2mail:[e-mail]1965,,,:[phone];E2mail:[e-mail]20052092062006713,ImcorpImcorp,,()83July2006HighVoltageEngineeringVol.32No.7