SF-,6--N-,2-混合氣體流注放電機制的計算機仿真.pdf

1、湖南大學碩士學位論文SFN混合氣體流注放電機制的計算機仿真姓名：王湘漢申請學位級別：碩士專業(yè)：電氣工程指導教師：汪沨20080510碩士學位論文AbstractSF6gasisanimportantinsulatedmediumandiswidelyusedinelectricpowerindustryforgas—insulatedequipmentHoweVer，SF6isagreenhousegasandisusedunderli

2、mitationssincetheKyotoProtocolwassignedin1997TheresearchofthesubstituteforSF6hasbecomeafocusforscientistsandelectricalequipmentmanufacturersThepurposeofthispaperistosimulatethegasdischargeprocessofSF6／N2gasmixtures，which

3、isthemostpromisingsubstitutef6rSF6，andtheresearchcanhelptounderstandthedischargemechanismsfbrsuchgaseousdielectricContinuityequationsfbrelectrons，positiVeions，andnegatiVeionsareusedtoestablishadischargemodelingasmixtures

4、withdifferentcontentofSF6Theelectricfielddistortioncausedbyspace—chargedfieldissettledbycouplingPoisson’sequationt0thecontinuityequationsAflux—correctedtransport(FCT)techniqueisusedtosolVethecontinuityequationsandthesimu

5、lationoftwodimensionaldischargeprocessinSF6isrealized，whichincludesionization，attachment，recombination，diffusionandphotoionizationprocessesTheanodeandcathodedirectedstreamersindifferentgasmixturesaresimulate(1andthesimul

6、ationresultsareanalyzedTheresultsshowthatacathodedirectedstreamercanbeobservediftheinitialstreamerisananodedirectedstreamerGapbreakdowntimeofananode—directedinitialstreamerislessthanacathodedirectedinitialstreamerThediel

7、ectricstrengthofahighSF6contentgasmixtureishigherthanalowonePhotoionizationcanacceleratethegasdischargeprocessandtheSF6contentislower，theaccelerationisstrongerThesimulationresultcandescribethestreamerdischargeprocessandd

8、ifferentparticlesdistributioninSF6／N2gasmixturesaccuratelyThedensitiesofdifferentparticlesandtheelectricfleldintensitycanbecalculatedquantitativelyKeyWords：GaseousDieIectric；Insulations；Streamer；Simulation；FluxCorrectedT