pt二次误接线导致的定子接地保护拒动分析

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1、345Vol.34No.5RE200631LAYMar.1,200617PT,,,,(,461000):PTPTB,PT:,,PT;,:;PT;B:TM772:A:10034897(2006)050017041,,2200MW,,WFB-100,85%95%,,PTPT,PT200531861907,APT,61911B()20V,5s:155.556V,5.0s,A93.53494(V),B6.764280(V),C96.443158(V),APT,ABC,95V(PT2PTB,,:1)PT12)U,E,3),:PT;PT1:Ugn3100

2、31003100),3,6h,B,,,PTB,PT1Fig.1Fieldelectricalconnectionofstatorwindinggroundingprotection18,PTEa2=Ua2-Un21=(2Ua1-Ub1-Uc1)(n1)(n2),3E=U-U1b2b2n2=31(2Ub1-Uc1-Ua1)(6)2.1n1n2PT,:EA=UAEc2=Uc2-Un2=3(2Uc1-Ua1-Ub1):Ua3=Ea3=Ea2Ub3=Eb3=Eb2(7)EB=UBEC=UC(1)Uc3=Ec3=Ec2,PT:

3、Ea1=EA(1)(2)(3)(6)(7),:a3=ABCU1(2U-U-U)3Eb1=EBUEc1=EC(2)1b3=3(2UB-UC-UA)(8)PTB,:1Uc3=3(2UC-UA-UB)Ua1=Ea1+Un1=Ea1-Eb1Ub1=0Uc1=Ec1+Un1=Ec1-Eb1Un1=-Eb1(3):3U03=Ua3+Ub3+Uc3=0(9):1,(PT,,,Y,,PT(3),)PT,:3U03=UA+UB+UC(10)2.2n1n2n1n2,:Un2=Un1=-UB(11),2.1,:Ua3=UA2Ub3=UBUc3=UC:

4、(12)2Fig.2Equivalentconnectionofstatorwindinggroundingprotectionn2,3U03=UA+UB+UC(13)(10)3,,U,U3n21=(Ua1+Ub1+Uc1)(4)ABC,:ZeZeU=Uej0A-:2jn2=a1b1c1U1(U+U+U)(5)3UB=Ue3j(14)2UC=Ue3:n1n2,(14)(8),PT19(10),UA+UB+UC=0,:Ua3=UAUb3=UBUc3=UC(15)(9)(20)(19),PT,,4.2n1n23U03=0=3U

5、03(16)(15)(16)(12)(13),:,[1](17)(12),:jUa3=3Ue6Ub3=0jUc3=3Ue2(21)4,(14),,B,:jUA=3Ue6,n1n2,,(13)(19)(20)(21),n1n2,,PT5,UB=0jUC=3Ue24.1n1n2(17)(8),:j0Ua3=Ue-2j(17)B,,:UA=95.53494(V)UB=6.764280(V)UC=96.443158(V)Ub3=Ue3(18)j2Uc3=Ue3,B,,,,

6、3U0

7、=155.556(V)(8),:Ua3=58.07064.428

8、(V)Ub3=57.775-55.451(V)Uc3=58.029-175.259(V)-15PT

9、3U03

10、=2.64810(V),PT,PT,:

11、Ua3+Ub3+Uc3-3U03

12、>Uset(19):Uset,30V(17)(10),BPT,:03=ABC

13、3U

14、1

15、U+U+U

16、=U=100(20)395V,,,,,(95V)Uset,PT,6PT,PTB,,,:,PT20,,,PTB1994,8.5B[2]BN[3],BPTN,,,PT:[1].PTB3U0[J].,2002,28(2):2024.LIZhongming.Analysis

17、ontheSelfproducedandOutconnected3U0ofMicroprocessorbasedProtectionatBPhaseEarthingonSecondarySideofPT[J].Relay,2002,28(2):2024.[2].[Z].1994.DepartmentofElectricPower.OutlineofAntiaccidentMeasuresonProtectionRelayandSecurityAutomationEquipmentofPowerSystem[Z].1994.[3],,.PTBN[A

18、]..:2001.ZHANGGuangmei,LIAOChangzhi,WANGHaizhou.ExperienceonC