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(xué)碩士學(xué)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(xué)位級別：碩士專業(yè)：高電壓與絕緣技術(shù)指導(dǎo)教師：文遠(yuǎn)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