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,,,,,(,400044):,,,,,,,,:;;;;:TM755;TP277:2007205231;:2007208215(2005AC3031);(200707C1C0070244)0,,,,,,,,,[122],,[324],(),,:;;,[5],,,,,,,,,[627],,,,,,;,111Fig.1Principleblockofdraw2outpowersupply60A1000A,,6V75V,DC/DC5V,DC/DC5V,673212008110Vol.32No.1Jan.10,20082W,1422.1,2,,12Fig.2No2loadequivalentmodelofdraw2outcoil[8],,:U2E2=4144fN2m(1)m=BmS(2):E2;f(50Hz);N2;m;Bm;S;[8]:Hml=2N1IE(3):Hm;l;IE,I1;N1,1BmHm:Bm=0rHm(4):0;r3,14,BH,,5,,Hm,Bm(1)(2),Bm,E2Hm,:,[9],,,,,:,,,,,[10]3Fig.3B2Hcurveofmagneticmaterials,,,[6,9,11],,,,212,IEH,314,BIE,IE,BBs(Bs),r,,44Fig.4ContrastofidealB2Hcurvebetweenordinaryandimprovedmagneticcore,,I1=100A,6V,U2=6V4144fN2BmS(5)(3)(4)(5),6V4144fN2S0r2I1l(6):N2r6l24144fS0I1(7),(7)77,RmFeRm:RmFe=l0FeSeq(8)Rm=0Seq(9):Seq;HFeH,eq,:F=N1IE=IE=I1=Bleq0(10):=BSeq=FRmFe+Rm(11)(8)(10)(11),:eq=FeFel+1=1l+1Fel(12)l=25112mm,=1mm,Bs=210T,S=400mm2,=0195,eq25112,(7)r,N2,[12]s,D=100mm,d=60mm,a=20mm,Rm=RmFe+Rm,,:IEmax=sRm=2Bsa0eqlnDd=155816A(13)1102A,,1102A[13],1000A,;,,,,,,,,,[14],;,213,Saber212,,2,100A,500A,1000A,5(a),141A1700A,5(b)5Fig.5Simulatedcurveofimproveddraw2outcoil5(a)5(b),1000A,;1000A,5(b),(1000A),,,100A,7V,(5)6V;1000A,55V,019,112115,75V,80V,(13)IEmax1102A,IEmax1000A,,1000A212,,,,,BmU2I1,,872008,32(1),,,,3311,237I1,U2,(1)(3)(4)B,H,r,,66,B,HH,6Fig.6ActualmeasurementofB2Hcurveofmagneticcore312,1,7,,7,60A250mW,;,200A7Fig.7Actualmeasurementofpowercurve,1000A,,210TP20/50115W/kg,1000A2h,34411U2I1,,Vin,,AA,412,,,,;,B,30kA5,,,60A1000A,,,,,,2()[1],,,..,2004,28(15):71275.JIAOShangbin,LIUDing,ZHENGGang,etal.On2lineinsulatorcontaminationmonitoringsystemfortransmissionlinesbasedontelemetry.AutomationofElectricPowerSystems,2004,28(15):71275.[2],,,.GPRS.,2004,28(21):92295.HUANGXinbo,LIUJiabing,WANGXiangli,etal.On2lineremote2monitoringsystemfortransmissionlineinsulator97,contaminationbasedontheGPRSnet.AutomationofElectricPowerSystems,2004,28(21):92295.[3]BANWELLTC,ESTESRC,REITHLA,etal.Poweringthefiberloopopticallyacostanalysis.JournalofLightWaveTechnology,1993,11(3):4812494.[4]SONGJ,MCLARENPG,THOMSONDJ,etal.Aprototypeclamp2onmagneto2opticalcurrenttransducerforpowersystemmeteringandrelaying.IEEETransonPowerDelivery,1995,10(4):176421770.[5],,..,2003,22(4):44247.LIPeng,CAIZhibin,LUOChengmu.Studyonpowersuppliesforhybridopticalcurrenttransformer.AdvancedTechnologyofElectricalEngineeringandEnergy,2003,22(4):44247.[6]..,2006,26(19):1602164.QIDong.Akindofpowersupplyofoptic2electriccurrenttransformerforaccommodatingwidebusdynamiccurrent.ProceedingsoftheCSEE,2006,26(19):1602164.[7]..,1999,27(1):40242.LIFuying,CHENYongting.DesignoffloatingtypepowersupplyappliedforphotoelectricCT.Relay,1999,27(1):40242.[8],..:,2000.[9].[D].:,2004.[10],,..,2004,28(24):28231.YINZhongdong,ZHANGWeihua,HANMingxiao.Over2saturationsuppressiontodynamicvoltagerestorerinjectiontransformer.AutomationofElectricPowerSystems,2004,28(24):28231.[11],,,..,2002,28(3):46247.LIFuying,ZHUXiaomei,JIKun,etal.Thepowersupplyofopticelectriccurrenttransducer.HighVoltageEngineering,2002,28(3):46247.[12],..,2001,27(2):22223.TANYugang,HANMin.Analysisonthesaturationoflow2frequencyRogowskicoilswithmagneticcore.HighVoltageEngineering,2001,27(2):22223.[13]..:,1989.[14],,..,2004,24(3):1082113.LUOSunan,TIANZhaobo,ZHAOXicai.Performanceanalysisofair2corecurrenttransformer.ProceedingsoftheCSEE,2004,24(3):1082113.[15]..:,2003.[16],,..:,2003.(1982),,,,:E2mail:lxz-5168@163.com(1971),,,,:(1967),,,,:ANovelSchemeofDraw2outPowerSupplyUtilizedinTransmissionLineStateMonitoringLIXianzhi,DULin,CHENWeigen,WANGYouyuan,SUNCaixin,LIJingyan(StateKeyLaboratoryofTransmission&DistributionEquipmentandPowerSystemSafetyandNewTechnology,ChongqingUniversity,Chongqing400044,China)Abstract:Anovelschemeofdraw2outcoilswhichareutilizedinthepowersupplyofthetransmission2linestateparameterson2linemonitoringsystemisproposed,aimingattheubiquityofproblemsinexistingliteraturesthatthedraw2outcoilsarepronetodeepsaturationandhighheatconsumption,andthusthecircuitsarecomplex.Theseproblemsareresolvedthroughintroducinganair2gapmagneticresistancetothedraw2outcoils,aswellasproperlymatchingparameterssuchastheconfigurationofthecoil,thematerialofthemagneticcore,turnnumbersandairgaplength.Thenapowersupplyequipmentisdevelopedbasedonthedraw2outcoilaforementioned.Integraltestresultsillustratethatthepowersupplyprovidesstableoutputswithnosaturationandlowheatconsumptionthroughoutthealternatingrangeofconductingcurrents.Besides,thispaperanalyzestheinfluenceofabnormallargecurrentsthroughtheconductoronreliabilityofthepowersupply.Detailedmeasurestoenhancethereliabilityarepresentedthereon.Shortcircuitandimpulsecurrenttestsshowthatthemeasuresproposedarecapableofrestrainingthedemolishmentfromelectrodynamicforceandovervoltagecausedbytheabnormallargecurrent.ThisworkissupportedbytheCrucialProjectsofChongqingScienceandTechnologyCommission(No.2005AC3031).Keywords:transmissionline;draw2outpowersupply;magneticcoresaturation;impulsecurrent;reliabilityanalysis082008,32(1)