系统如所示。已知:T1,T2:100MVA,Uk%=10。l:SB=100MVA

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问题 系统如所示。已知:T1,T2:100MVA,Uk%=10。l:SB=100MVA时的标幺值电抗为0.03。当f1点三相短路时,短路容量为1000MVA,当f2点三相短路时,短路容量为833MVA,则当f3点三相短路时的短路容量为下列何值(  )A.222MVAB.500MVAC.900MVAD.1000MVA

选项 A.222MVA
B.500MVA
C.900MVA
D.1000MVA

答案 C

解析 设短路容量标幺值为Sd*,可知:①当f1点短路时,忽略后边支路:②当f2点短路时,忽略前面支路:xT1*=(Uk%/100)(SB/STN)=10/100×(100/100)=0.1xl*=0.03xT2*=(Uk%/100)(SB/STN)=10/100×(100/100)=0.1③当f3点短路时,等值电路如题49解图所示。说明:2
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