简介:Thestrengthofthepowerfrequencyelectricintensityandmagneticfieldofthe500-kVdoublecircuittransmissionlineswascalculatedbyusingtheequivalentchargemethodandtheAmpere'sLaw,andtheenvironmentalimpactfactorsofthefieldswereevaluated.Byoptimizingthephasesequence,thefrequencyelectricintensityandmagneticfieldstrengthcanbereduced.Withinadistanceof25mfromthecenterofthetransmissionline,thepowerfrequencyelectricintensityandmagneticfieldstrengthfalloffsharplywiththedistanceincrease.Finally,thebestphasesequenceandtheminimumgroundclearanceofthetransmissionlineswereobtainedtomeettherequirementsoftheleastimpactonenvionment.
简介:OnDecember28,2000,330kVShenmuSubstation,akeyoneof330kVYulin-Shenmupowertransmissionandsubstationprojects,hasbeensuccessfullyputintooperation.Itmarkedthatthewhole330kVtransmissionandsubstationprojectofShaanxi’sextra-highvoltagegridhadbeencompleted.Allthe330k
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简介:ItisacommonpracticeinChinatouseaninsulatedsilkjacklad-derinthelive-lineworktoenterthe500kVEHVelectricfield.WuhanHighVoltageResearchInstitutehassuccessfullycarriedoutsuchoperatingperformanceatthemeetingofESMO-90inCanada.(Fig.1)Theoperatingprocedureisnowrecommendedasfollows.
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简介:DuringtwoyearsoddperiodfromDec.1987toFeb.1990,therehadbeenrepeatedlypollution-flashoverfailuresonour500kVtransmissionlines,resultinginawidescopeblackout.Therewereeleven500kVlinesaltogetherinNorth-east,EastandNorthChinapowergrids,wherepollution-flashoverfailureshappenedoneafteranotheron36transmissionlinetowers(poles).Since500kVtransmissionlinesarethemaintrunksofhighvoltage
简介:TheDevelopmentof3DCADtechnologypresentsaneweffectivetoolindesigningoutdoorswitchyardforpowerplant.Anewlayoutpatternof330kVswitchyard(SWYD)ofalignedtypewasstudiedwiththismethod.Someissuesaboutcomputerized3DmodesappliedinSWYDdesignarealsodiscussedinthispaper.
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简介:OnOctober12thisyear,thecontractsoftheprocurementontheconverterstationequipmentforThreeGorges-GuangdongandGuizhou-Guangdong±500kVDCtransmissionprojects,know-howtransferandthesubcontractsonequipmentmanufacturinghasbeensigned.Theconstructionscaleofthetwoprojectsis