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1、华中科技大学硕士学位论文AbstractWiththeincreasingprotectionofhumantothenaturalecologicalenvironment,thenumberofbirdsisincreasinghighlyinrecentyearsandthescopeofbirds‘activitiesisexpandingsharply,whichhaveseriouseffectsonthesafeoperationofthetransmissionlines.Statisticaldataofrecentdecadesa
2、thomeandabroadshowsthatthefaultcausedbybirdshasbecomeoneofthemainreasonsfortrippingaccidentofpowersystem,seriouslythreateningthesafeoperationofthepowersystem,andtheharmdegreeofwhichissecondonlytolightningandexternaldamage.However,theexistingresearchofbirddamagetotransmissionlin
3、esmainlyfocusonbirdfaultstatisticsanditsrelatedfaultinvestigations,whileresearchofexperimentalstudyofbirddamagemechanismandnumericalanalysisisseldomreported.Therefore,findingoutthecharacteristics,causesandmechanismofbirddamageandaccuratelyclassifyingprotectionscopemayhelppeople
4、deepentheirunderstandingofbirdrelatedoutagesandtakeeffectivecorrespondingmeasures,whichhaveimportantguidingsignificanceforbirddamageprotectionontransmissionline.Streamerflashoveristhemaintypeofbirdrelatedfaults,whichmainlyoccursonthetransmissionlinesof220kVandbelow,whileitisrep
5、ortedthatstreamerflashoveralsohappenedon500kVlinesinrecentyears.Researchofmechanismofstreamerflashoveranditsrelatedinfluencefactorsisseldomreported,besides,themechanismofstreamerflashoverisnotinterpretedclearlyandthereisnoflashoverprotectionscopeofdifferentvoltagelevelsoftransm
6、issionline.Aimingatsolvingtheseproblems,thispapercarriedoutsomerelatedexperiments,firstly,findoutthekeyfactorsaffectingtheflashoverandtheprotectionscopein110kVleveltest,basedonthis,220kVand500Vleveltestsarecarriedout,fromwhichweputforwardlongairgapflashoverformationmechanismand
7、protectionscope.Testsofstreamerflashoverwhenwireiswrappedwithinsulationsheatharecarriedout,resultsshowthatwrappinginsulationsheathwirecaneffectivelyreducethepossibilityofstreamerflashover.Asthesupplementandperfectionofexperimentaldata,thispaperhasalsocarriedonsimulationstudyons
8、treamerflashover.InconsiderationoftransmissionIII华中科技大
