90-接线功率方向继电器的分析与改进

90,(,210096):,(90)Yö$,,,:;90;;:TM588.1+5:A:100328930(2006)0320089205AnalysisandImprovementof90ConnectionPowerDirectionalRelayZHAOYong2bin,LUYu2ping(DepartmentofElectricalEngineering,SoutheastUniversity,Nanjing210096,China)Abstract:Itiswidelyknownthatfaultdirectioncanbedeterminedaccuratelybypowerdirectionalrelaywhennon2faultphasevoltageisintroducedtoeliminateblindareawith90connection.However,whenphase2to2phasefaulthappensatthedeltasideoftheyd211transformer,thedirectionalrelayontransmissionlineortransformernearbyatstarsidemaynotperformcorrectly.Thispaperanalyzesitsmechanismandputsforwardanewmethodtoimprovethedirectionalrelay’sperformance.Keywords:directionalrelay;90connection;misoperation;reliability1,,,,,,90,,[1]Y0ö$-11,,[2,3],,,290,90,1A,[1],1Fig.1Systemconnectionandphasordiagram18320066ProceedingsoftheCSU2EPSAVol.18No.3Jun.2006:2005204215;:2005210224,()Ud(0,90),30A60A=3045,Y0ö$-11,2,Eõ1Eõ2,B,T,Y0ö$-11,,B,B,2Fig.2Anapplicationofdirectionrelays2dBC,,3,AIaad(1)=-Iaad(2);Iaad(0)=0;Uõad(1)=Uõad(2)90,3,arg(IaCöUõA)=30,IaA=IaB=-IaCö2UõAUõBUõC,290,,arg(IaCöUõAB)=0arg(IaBöUõCA)=60arg(IaAöUõBC)=-6030A60A,2,A,BCBABCB,A,BC,,3BCY0ö$-11Fig.3Theyd-11transformer’scurrentandvoltagephasorsunderBCphasefault,BABC,,:IaA=IaB=-IaCö2,UõAUõBUõCarg(IaCöUõAB)=-Harg(IaBöUõCA)=60+Harg(IaAöUõBC)=-60+HH,,H,,,3MATLAB6.52,3.1Ea1Ea2Ea1Ea2R=108,L=6.631023H,,110kV,A0BABC50km,:R1=0.058,R0=0.408L1=0.901023H,L0=4.101023HC1=12.741029F,C0=7.751029FY0ö$-11,40MVA,1100920066kVö10kV,R1=0.01(p.u.),L1=0.3(p.u.)R2=0.01(p.u.),L2=0.3(p.u.)Rm=500(p.u.),Lm=500(p.u.)BC,0.050.09s,00.2s,(a)ABC(b)BCA(c)CAB4ÉFig.4PhaserelationoftransformerprimarycurrentandvoltageformodeÉ,,(4),BC,IaAIaB-IaCö2,,,arg(IaCöUõAB)9arg(IaBöUõCA)55.8arg(IaAöUõBC)-57.6,30A60A(2A=45),A,BC,BABC,A,BC,,,ABCA,,,,3.2Ea1Ea2Ea1Ea2300MVõA,XöR=10,,110kV,A0,,BC,0.050.09s,00.2s,(a)ABC(b)BCA(c)CAB5ÊFig.5PhaserelationoftransformerprimarycurrentandvoltageformodeÊ5,BC,IaAIaB-IaCö2,BC,19183:90arg(IaCöUõAB)0arg(IaBöUõCA)34.2arg(IaAöUõBC)-61.2,BABC,A,BC,,4,,[1],90,,A(30,60),,IaA(1)öUõBC(1),IaB(1)öUõCA(1),IaC(1)öUõAB(1),2,dBC,:Iada=0Iadb=-IadcUõdb=Uõdc,Iad(0)=0Iad(1)=-Iad(2)Uõd(1)=Uõd(2)(1):Uõdû0û-Uõd(1)=Iad(1)Z2(1)0-Uõd(2)=Iad(2)Z2(2)0-Uõd(0)=Iad(0)Z2(0)(2):Uõdû0û;Z2(1)Z2(2)Z2(0)(1)(2):Iad(1)=-Iad(2)=Uõdû0ûö(Z2(1)+Z2(2)):Z2(1)=Z2(2),Uõd(1)=Uõd(2)=0.5Uõdû0ûarg(Uõ1öIa1)=argZ2(1)UZ(1),6UZ(1)(0,90),arg(IaC(1)öUõAB(1))=90-UZ(1)arg(IaB(1)öUõCA(1))=90-UZ(1)arg(IaA(1)öUõBC(1))=90-UZ(1)A=3045,,,,,,3.1,,6(a)(b),,235,6(c)(d),,35,,UZ(1)85,90,(a)(b)(c)(d)(e)6Fig.6Sequencecomponentsrelationoftransformerprimarycurrentandvoltage2920066,,,,,,,,3.2,,90,,5,,,,Y0ö$-11,90,90,,:[1],.[M].:,1994.[2].[M].:,1998.[3].[M].:,1993.[4],(NieJuanhong,LuYuping).(Studyonconnectionandinterioranglesettingofpowerdirectionalelementinmainequipmentprotection)[J].(ElectricPowerAutomationEquipment),2002,22(9),6-10.[5],,(FanChunju,ZhangZhaoning,YuHuaiyong).(Directionalpartbasedonfuzzyneuralnetwork)[J].(ProceedingsoftheCSU2EPSA),2003,15(6),53-55.[6],(AnYanqiu,GaoHoulei).(Positivesequencefaultcomponentsanditsapplicationinprotectiverelaying)[J].(ProceedingsoftheCSU2EPSA),2003,15(4),76-78.:(1971-),,,Email:[e-mail](1962-),,,,Email:[e-mail]39183:90