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基于ComsolMultiphysics喷射式熔断器弧前时间数值仿真.docx

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基于ComsolMultiphysics喷射式熔断器弧前时间数值仿真 Abstract: Thispaperpresentsanumericalsimulationstudyofthearcinitiationtimeinjet-typefuse.Jet-typefuseisanimportantcomponentincurrenthighvoltagecircuitbreakers.Thepurposeofthisstudyistoinvestigatetheeffectofdifferentnozzlegeometriesonthearcinitiationtime,andtooptimizethedesignofthejet-typefuse.ThesimulationiscarriedoutusingComsolMultiphysicssoftware.Theresultsshowthatthearcinitiationtimeisafunctionofthenozzlegeometryandtheinternalpressureofthefuse.Theoptimizeddesignofthejet-typefusecanreducethearcinitiationtimeandimproveitsoverallperformance. Introduction: Jet-typefuseisacommoncomponentinhighvoltagecircuitbreakers.Itisusedtointerruptthecircuitwhenhighcurrentscausethermalstressonconductingmaterials.Whenthecurrentthroughthefuseexceedstheratedcapacity,thefusemeltsandopensthecircuit,protectingtheequipmentfromdamage.Theoperationofthefuseisbasedontheprincipleofarcextinction.Duringthemeltingprocess,astreamofgasisreleasedfromthefuse,whichblowsoutthearcandquenchesit.Thekeyperformanceparameterofthejet-typefuseisthearcinitiationtime,whichisthetimedelaybetweenthecurrentoverloadandthearcextinction.Theshorterthearcinitiationtime,thefasterthecircuitcanbeinterrupted,andthebettertheprotectionagainstovercurrents. Therearevariousfactorsthataffectthearcinitiationtime,suchasthegeometryofthenozzle,theinternalpressureofthefuse,andthematerialpropertiesofthefuse.Inthisstudy,wefocusontheeffectofnozzlegeometryonthearcinitiationtime.Theaimistooptimizethedesignofthejet-typefusebyreducingthearcinitiationtime. Methodology: ThesimulationiscarriedoutusingComsolMultiphysicssoftware.Themodelconsistsofajet-typefusewithdifferentnozzlegeometries.Thenozzlegeometriesarevariedbychangingtheangleanddiameterofthenozzle.Theinternalpressureofthefuseisalsovariedtostudyitseffectonthearcinitiationtime.ThesimulationisrunusingtheAC/DCmodulewiththefollowingassumptions: •Thefuseismadeofcopperwithameltingpointof1083°C; •Thearcismodeledasaheatsourcethatgeneratesatemperaturerise; •Thegas