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1、Theoriginal126kVVacuumCircuitBreakerDebutedinChinaJimeiWang（DepartmentofElectricalEngineering,Xi'anJiaotongUniversityXi'an710049,ShaanxiProvince,P.R.China）Abstract-Asinglebreak126kVvacuumcircuitbreakerdebutedinChinaisintroduced.Configurationof126kVvacuum
2、circuitbreakerandconfigurationofitselectrodeareillustrated.Particularly,siliconeoilisusedasexternalinsulationofvacuuminterrupters.Heatradiatorsaredesignedforraisingratedcurrent.Permanentmagnetactuatorswithlongstrokearedevelopedforimprovingperformanceofth
3、evacuumcircuitbreaker.I.INTRODUCTIONAprojectofresearchinganddeveloping126kVsinglebreakvacuumcircuitbreakerisbeingdonebycooperationofXi'anJiaotongUniversity,vacuuminterruptermanufacturersandvacuumswitchgearfactoriesinChina.Ittooknearlysixteenmonthstofinis
4、haprototype.ItsmaintechnicalobjectivesareshowninTable1.II.CONFIGURATIONOF126kVVACUUMCIRCUITBREAKERThe126kVsinglebreakvacuumcircuitbreakerprototypeisshowninFig.1,whichshowsthreevacuuminterruptersareindividuallyassembledineachporcelainbushing1.Porcelainins
5、ulatingsupport2ismountedonahorizontalsteelbracket3,andthreepermanentmagnetactuators4areseparatelyinstalledattheendofeachinsulatingporcelaininsulatingsupport2,whichareelectronicallycontrolledbycontrolbox5,thussynchronizationswitchingcouldberealized.Twoste
6、elvacuuminterrupterthatisassembledinporcelainbushing,2-porcelaininsulationsupporters,3-horizontalsteelbracket,4-permanentmagneticactuator,5-controlbox,6-steelsupportingstand,7-steelbasesupportingstands6areweldedbetweenhorizontalsteelbracket3andsteelbase7
7、.Thevacuumcircuitbreakerisfixedonacementblock.Thedistancebetweenvacuuminterruptersis1700mmandthetotalheightofthebreakerisapproximately5000mm.III.ELECTRODEANALYSISA.Axialmagneticfieldelectrode-TypeAConfigurationoftypeAaxialmagneticfield(AMF)electrodeissho
8、wninFig.2.J1'Magneticfieldisgeneratedwithcurrentpassingthroughcoilsanditappliesonvacuumarc,whichisshowninFig.3.TheaxialmagneticfluxdensitydistributiononintermediateplaneofcontactgapatcurrentpeakisshowninFig.4.Itshowedthatm
