氣體絕緣變電站開關操作產生的電磁干擾問題研究.pdf

1、華北電力大學（保定）博士學位論文氣體絕緣變電站開關操作產生的電磁干擾問題研究姓名：張重遠申請學位級別：博士專業(yè)：電工理論與新技術指導教師：崔翔20040501ABSTRACTABSTRACTSupportedbyNationalNaturaIScienceFoundationofChina(No50077006)andNaturalScienceFoundationofHebeiProvince(No503424)，thesetupme

2、thodofcircuitmodelforinstrumenttransfelrrrlerandtransientelectromagneticInterferencetothesecondaryequipmentsthrou曲conductivecouplingduetOswitchingoperationsinGasInsuIatedSubstation(GIS)areresearchedinthisPapecThemaincont

3、ributionsareasfollows：1Themethodtosetuphighfrequency艦nsferfunctionmodelforinstmmenttransformerinGISbymeansofVectorFittingispresentedAccordingtothepracticalconditionthe0rderreductionmethodforthehighfrequencyPansfer缸nction

4、modeIofinstrumentPansfoiTnerisproposed2ThesetuPmethodforinstrumenttransformer’scircuitmodeliSproposedWeuseaspecialRLCsynthesismethodfortransferfunctionbasedontherealpartdecompositiontechnique￡osetupthehighfrequencycircui

5、tmodelforinstrumenttransformerThecircuitmodelfora1l0kVpotentialtransformerinGISiSbuiltTimedomainandfrequencydomainsimulationresultshavevaldatedthismethod3InusingtheFDTDmethodtesearchthetransientprocessoftheoverheadlinefo

6、rtheconvenienceofthetimedomainconvolution，theVectorFittingmethodiSadoptedtoexpendthefrequencydomainformofgroundreturnimpedanceintoasumoffiniteexponentialfunctionswhichareeasytobetreatedandtesttobevalidComparedwithEMTPthe

7、methodproposediSdemonstratedtobeeffective4ThemodelingmethodsforeveryprimaryequipmentinGISarediscussedandsummarizedAprimarysystemmodelfora125kVGISiSbuiltbyEMTP’theVFTOandTGPRaswellasthetransientcurrentinthegroudingconduct

8、orarecalculatedThereiSagoodagrementbetweenthesimulationresultsandmeasurementresults5Anwholeconductivecouplingmodelforall0kVGISwhichcontainingthreephasesinoneencapsulationiSbuiltbyEMTPtheVFTOandTGPRaswellastheinterference

9、voltagesontheportofthesecondaryequipmentarecalculatedThesimulationresultsareconsistentwiththemeasurementresultsofanotherl10kVGISThemagnetitudeofthedisturbingvoltagesarenotbig(aboutIOOV)，buttheirmainfrequencyisveryhigh(30

10、MHz～40MHz)，Thisphenomenoncan’tbeneglectedbythesecondaryequipmentdesigner6The3Delectromagneticfieldofa220kVGISarecalculatedbymeansofNumericalElectromagneticCodeInordcrtodecreasetheworkloadthe“modifiedcoefficient”methodare

11、adoptedAccordingtothepracticalconditionsofthisGIS，themethodtodecreasethecomputingerrorareputforwardComparedwiththemeasurementresults，themethodproposediSdemonstratedtobeeffectiveKeywords：GasInsulatedSubstation，Electromagn