同塔四回输电线电流差动保护-研究

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1、上海交通大学硕士学位论文ABSTRACTtheoreticalanalysisandnumericalcalculationofQCTL.(2)Distributecapacitancecurrentontransmissionlinewilldecreasesensitivityandreliabilityofcurrentdifferentialprotection.ThispaperanalyzescapacitancecurrentofQCTL,andtheresultsshowthattheinfluenceofdistributecapa

2、citancecurrenttocurrentdifferentialprotectionisbigduetotheincreaseamountoftransmissionlinesandmutualdistributecapacitance.SothecapacitancecurrentcompensationisessentialforcurrentdifferentialofQCTL.Basedonphase-modetransformation,aschemeofcapacitancecurrentcompensationforQCTLwhi

3、chcanenhancetheperformanceofCDPisproposed.(3)Themodecurrentwillreflectdifferentfaulttypeifthetransformationmatricesaredifferent.Itcandistinguishsingleline-groundfaultbyintegratingtheinformationofeachcurrentmode.Basedonthisprinciple,thepaperpresentsanewmode-currentdifferentialpr

4、otectionforQCTL.Thecapacitancecurrentcompensationofthisprotectionschemeisthensimple,andtheprotectionhassufficientsensitivityandquicktrippingspeed.(4)Withthephase-modetransformationofQCTL,thecurrentcomputationmethodbasedonBergerontransmissionlinemodelispresented.Basedonthegradie

5、ntofmathematicalmorphology,anovelBergeroncurrentdifferentialprotectionschemeforQCTLispromoted.ThecapacitancehavenoimpactoncurrentdifferentialprotectionbasedonBergerontransmissionlinemodelbecauseitcomparesthecurrentsofthesameterminalandtheBergeronmodelhastakenthedistributecapaci

6、tanceintoconsideration,soithasagoodsensitivityandreliability.IV上海交通大学硕士学位论文ABSTRACTFinally,foralltheprotectionschemesproposedinthispaper,QCTLtestmodelswithdistributionparameterareestablished.Simulationresultsverifythefeasibilityandvalidityofalltheprotectionschemes.KEYWORDS:quad

7、ruple-circuitstransmissionlineonthesametower,currentdifferentialprotection,phase-modetransformation,capacitancecurrentcompensation,bergeron,mathematicalmorphologyV上海交通大学硕士学位论文目录目录摘要.................................................................................................

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