GBT155441995三相交流系统短路电流计算

GB/T155441995GB/T155441995Short-circuitcurrentcalculationinthree-phasea.c.systems1995-04-061996-01-01IEC909(1988)(909)11.11.2380V220kV50Hz()2GB15693GB2900.192GB2900.259433.1short-circuit3.2short-circuitcurrent3.3()prospective(available)short-circuitcurrent3.4symmetricalshort-circuitcurrent()3.5initialsymmetricalshort-circuitcurrent()GB/T155441995(112)3.6initialsymmetricalshort-circuit(apparent)powerkS′′Un3knk3IUS′′=′′3.7()iDCD.C(aperiodic)componentofshort-circuitcurrent(112)3.8iPpeakshort-circuitcurrent()(112)ip3.9short-circuitbreakingcurrent3.9.1Ibsymmetricalshort-circuitbreakingcurrent3.9.2Ibasymasymmetricalshort-circuitbreakingcurrentIbasymIIibasymbbDC=+2223.10IKsteady-stateshort-circuitcurrent(112)3.11ILRsymmetricallooked-rotorcurrentUrm3.12equivalentelectriccircuit3.13()(independent)voltagesource3.14Umnominalsystemvoltage()3.153/ncUequivalentvoltagesource3.16cvoltagefactorc313.17EsubtransientvoltageE”ofasynchronousmachineGB/T155441995Id3.18far-fromgeneratorshortcircuit()3.19near-togeneratorshortcircuitIK5%3.20Fshort-circuitimpedancesattheshort-circuitlocationF3.20.1)1(Zpositive-sequenceshort-circuitimpedanceZ()1ofathreephasea.c.system(8.3.14a)3.20.2Z()2negative-sequenceshort-circuitimpedanceZ()2ofathreephasea.c.system(8.3.14b)3.20.3Z()0zero-sequenceshort-circuitimpedanceZ()0ofathree-phasea.c.system(8.3.14c)3.20.4Zkshort-circuitimpedanceZkofathree-phasea.c.system3.21short-circuitimpedanceofelectricalequipment3.21.1Z()1positive-sequenceshort-circuitimpedanceZ()1ofelectricalequipment(8.3.2)3.21.2Z()2negative-sequenceshort-circuitimpe-danceZ()2ofelectricalequipment(8.3.2)3.21.3Z()0zero-sequenceshort-circuitZ()0ofelectricalequipment(8.3.2)GB/T1554419953.22XdubtransientreactanceXdofasynchronousmachine3.23tminminimumtimedelaytminofacircuitbreakertmin4XRZj+=4.1Ac3/ncU()Ef(50Hz)Ib()Ibasym()Ik()IKPIKIK3()ILRiDCiPKPKTqqnRrRGIKiPSK()Srtftmintr()Un,()Ur,()GB/T155441995ukr,%uRr,%U()1U()2U)(0XxXdXqXdqXdXq()tdsatZ(1)Z(2)Z(0)u04.2(1)(2)(0)fkk3k1k2k2EkE2Emaxminnrrs1tATBGB/T155441995EFGHVLVLLRLaLbLcabcMM()()MVNPPSUQT4.3()1IkiPIkiDCAiDC5iDCiPfX/RiPiDC9.1.3.2iPibasymiDC(112)iDCGB/T155441995iIDCKftRX=2/e-2π(1)Ikf,50HztR/X9.1.3.2B(1)1.159.1.3.2Ct0.010.020.050.10.25fc/f0.40.270.150.0920.055f=50Hz6a.b.c.227GB/T1554419953/ncU(10.3.2.610.3.2.710.3.2.8)38.3.23/ncUc1(Cmax)(Cmin)3I″k1Uncmaxcmin220/380V380/660V1140V1.001.050.951.00335kV1.101.0035220kV1.101.00cUnUm(2)a.220/380VGB/T155441995cUUnn/./31003=(2a)b.380/660V1140VcUUnn/./31053=(2b)c.335kV35220kVcUUnn/./31103=(2c)()81AIKIK()IK=Ib=IKIKiPXQtXTLVXTLV2XQt(3)8.1Z()18.2(2b)(2c)(2d)YzDyDzYZIIIILa=++()()()120(3a)IaIaIILb=++212()()()0(3b)IaIaIILc=++()()(12)(3c)0a=−+123j12a2123=−−j12(4)GB/T1554419958.3F8.3.1FF4F4a4bFZ()1Z()29=KZ(1)Z=(2)Z(1)Z()4cFZ(0)GB/T1554419958.3.2=(1)Z(2)Z5dZ0Z(1)56GB/T1554419958.3.2.16aQSKQIKQQZQZcUScUIQQ==nKQnQkQ32(5a)QSKQIKQ6bZQtZcUStcUItrQQtnKQnQkQr3=⋅=⋅22211(5b)ZQtUnQQSKQQ()IKQQc1(2)tr35kV()ZQ=0+jXQRQ=0.1XQXQ=0.995ZQ8.3.2.2ZTZUUSTkrkr=⋅100%rT(6)RUUPITRrrTkrT100%S3=⋅=22rTT(7)XZRTT=−22T(8)UrTIrTSrTPkrTuKr%uRr%iPiDCGB/T155441995ZT()0(6)a.(36b)b.UTHV=UrTHV(1PT)PT0.05c.ukminukr(ukminukr)d.Un(U1.05Un)7ZHZMZL(H)7ZuUHMkrHMrTHrTHM100%S=⋅2(L)(9a)ZuUHLkrHLrTHrTHL100%S=⋅2(M)(9b)ZuUMLkrMLrTHrTML100%S=⋅2(H)(9c)ZZZZHHMHL=+−12()ML(10a)ZZZZMMLHM=+−12()HL(10b)ZZZZLHLMLH=+−12()M(10c)UrTHSrTHMHMGB/T155441995SrTHLHLSrTMLMLukrHMHM%ukrHLHL%ukrMLML%8.3.2.3ZL=RL+jXLZ(0)=R(0)+jX0R(0)L/RLX(0)L/XLZ(1)Z(0)20RLqnRq'L=ρn(11)=1/54mm2/m=1/34mm2/m=1/31mm2/mqnX’L(/km)Xfndrfndr'(.)(.)LInIn=+=[phone]πµπµ(12a)ddddd=LaLbLbLcLcLa3rrnrRnn=−01,Rr0nn=100=4104H/km,f=50Hz(12a)Xndr'.(.)LIn=+00628025(12b)8.3.2.48.3.2.5()(),,GB/T155441995II∑≤rMk001.(13)IrM()IK()8.4tr99.19.1.19.1.1.1I”K3I”KIcURXcUZknkknk33=+=22(14)3/ncURK(8.3.2)RK=RQt=RT=RL;XKXK=XQt+XT+XLZK(8.3.2)ZRXkk=+22kRk0.3XkXkZkI”KIb(15)IKIkbk==′′9.1.1.2ipikIp=′′2k(16)k′′Ik1.02+0.98eRX−3/8R/X(X/R)GB/T15544199589.1.29.1.2.1IKIKIbIKIKIbIK9IKT1IKT2(14)′′=′′+′′IIIkKT1KT2(17)IKIkbk==′′(18)9BFZBF0.05UN(kB3I′′)ZBFIKB(17)9(BF)9.1.2.2ipip9iiippT1pT2==(19)GB/T1554419959.1.39.1.3.1IKcUn3Zk=Z(1)10IKIcUZcURXknknkk33==+22(20)3/ncUZK(15)IK=Ib=IK10GB/T155441995T1T29.1.3.2ip(16)ipkAR/XX/Rk=kaR/X(X/R)R/X(X/R)8kR/X(X/R)80%ka1.8ABR/XX/Rkk=1.15kb(21)1.15R/XkbkkkjXRZ+=R/X81.15kb1.82.0Cfck=kcR/XX/R8kcRXRXff=⋅ccc(22a)XRXRff=⋅ccc(22b)RcZCRXcZCZC=Rc+jXc=Rc+j2fcLcfc=20Hz9.22bcdZ(2)/Z(1)1()11GB/T15544199511Z(2)/Z(1)=1Z(2)/Z(1)=0.5Z(2/Z(1)=0.659.2.19.2.1.1IK2IcUZcU()()()k2nnZ=+=1212Z(23)Z(2)/Z(1)IIk2k=32(24)IK2IK2Ib2IK2=Ib2=I”K2(25)9.2.1.2iP2iP2=k2I”K2(26)k9.1.1.29.1.3.2k9.2.2GB/T1554419959.2.2.1IK2EIKE2E2c()()()()IcUaZZZZ/k2Elbn=+++1220110(27a)()()()()IcUaZZZZ/k2Elcn=+++120110(27b)Z()1=Z()2aa2(4)2cIKE2E()()IcUZZkE2En=+3210(28)9.2.2.2ip2Eip3ip2Eip1ip2Eip2E9.2.39.2.3.1ip3I”K12d()()()()()IcUZZZcUZZk1nn=++=[phone](29)IK1Ib1IK1[(15)(25)]IK1=Ib1=I”K1(30)9.2.3.2ip1ip1ikIp=21k(31)9.1.1.29.1.3.29.39.3.1a.c(1)b.c.d.RL()RCRoLec=+−⋅1000420.θL20(32)GB/T155441995RL2020e0.004/9.3.2I”KI”KIcUZkminnk3=(33)Zc1cZk=()19.3.1()1012IbIkIkIbA12IkipIkiDCAiDCGB/T15544199513iDC(1)10.110.2