氣體絕緣變電站開關(guān)操作產(chǎn)生的電磁干擾問題研究.pdf

1、華北電力大學(xué)（保定）博士學(xué)位論文氣體絕緣變電站開關(guān)操作產(chǎn)生的電磁干擾問題研究姓名：張重遠(yuǎn)申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：電工理論與新技術(shù)指導(dǎo)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