高海拔超高壓變電站過電壓與絕緣配合.pdf

1、華中科技大學碩士學位論文高海拔超高壓變電站過電壓與絕緣配合姓名：崔忠寧申請學位級別：碩士專業(yè)：高電壓與絕緣技術指導教師：文遠芳20110105IIAbstractWiththerapiddevelopmentofthesocialeconomytheexpansionofthepowergridthereismeintensivepowergridlocatedinTibetanPlateauYunnanGuizhouPlateau.I

2、tisveryimptantfthereliabilitysafetyofthepowersystemtostudytheovervoltageinsulationcodinationofEHVsubstationinthehighaltitudearea.TheovervoltageinsulationcodinationofEHVsubstationinthehighaltitudeareaisbasedonthemodifiedc

3、alculationoftheinsulationstrengthofEHVsubstationinthehighaltitudearea.Thispaperpresentstherelationshipbetweenthealtitudetheinsulationstrengththeinsulationstrengthofa’haihyowerplantwascalculatedconsideringtheimpactoftheal

4、titude.UsingtheelectromagictransientanalysisprogramATPEMTPthelightningovervoltagemodelwasestablishedbasedonthestructuretparametersofa’haihyowerplanttransmissionlinesthelightningovervoltagewascalculated.Therelationshipbet

5、weenthelightningovervoltagethelightningattackpositionwasstudiedtherelationshipbetweenthelightningovervoltagethedistancefromthetransfmertothetopofthedamtotheterminalofthetransmissionlineswasalsostudied.Overvoltagecontrolm

6、ethodswerediscussed.Theswitchingovervoltagemodelwasestablishedbasedonthestructuretparametersofa’haihyowerplanttransmissionlinestheswitchingvoltagewascalculated.ThenecessityfeasibilityoftheEliminationofclosingresistsonEHV

7、circuitbreakerswasdiscussedinthispaper.Atlasttheconceptofrigidstaggeredclosingwasintroducedthefmulaontheclosingtimeofeachlinewasdeduced.Keywds:highaltitudeEHVsubstationovervoltageInsulationcodinationovervoltagecontrolmet