根据图(四)化简可得:
Xa*?(X2?3*?X12*)(X3?3*?X13*)(0.0667?0.2094)(0.0667?0.2094)??0.138X2?3*?X12*?X3?3*?X13*0.0667?0.2094?0.0667?0.2094(X?X7*)(X4*?X8*)(0.094?0.0625)(0.1199?0.0042)Xb*?1*??0.0666X1*?X7*?X4*?X8*0.094?0.0625?0.1199?0.0042
X14*?Xb*?Xa*?0.0666?0.138?0.2046?X15*?X14*?X10*0.2046?0.5854?X14*?X10*0.2046?0.58541X?*??1?6.5960.1516Sb3Uav?6.596?1003?10.5?36.269KA?X?*???X15*?0.1516(3)??IK3*?
?(3)?(3)??IK3?IK3*?短路冲击电流和短路容量:
(3)?iimp??2.55IK3?2.55?36.269?92.49KASK??I?Uav?1.732?36.269?6.5?659.59MVA(3)K3(3)??1.51I(3)短路全电流最大有效值: IimpK3?54.77KA
③电抗器校验:
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a、 动稳定校验,该电抗器动稳定电流为100.1KA,大于三相冲短路击电流92.49KA,故动稳定合格. b、 校验短路时母线的残余电压
(3)?IK32.269U%?XDK%?3?12??145.1KA?70 合格
IDKE3c、 校验正常运行时电压损耗:
I2.076?U%?XDK%?lmaxsin??12??0.6?4.9?5 合格
IDKE3根据图五可得
I14?X10*0.5854(3)??IK??36.269?26.87KA 3X10*X14*0.5854?0.2046(3)∴I10?IK3?I14?9.393KA
故加入限流电抗器后K3点短路时,两变压器低压侧10KV出线与两同步调相机出线的电流分别为:
I2?3??I3?3??13.44KA???????I5??I6??4.696KA
变压器低压侧10KV出线上的短路冲击电流为34.267KA,同步调相机出线 的短路冲击电流为11.976KA，则出口断路器能够满足要求。 3、K1点短路分析
等值电路图如下:
化简可得:
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X7*?(X2?3*?X12*)(X3?3*X13*)X5*X6*?X2?3*X2*X3?3*X13*X5*X6*(0.0667?0.2094)(?0.0667?0.2094)1.1707?1.1707?0.6677?0.2064?0.667?0.20941.1707?1.1707?0.7335?X9*?X4*?X2?2*X3?2*?0.0083?(?0.0083)?0.1199??0.1158X2?2*?X3?2*?0.0083?0.0083
继续化简可得:
?X?*?0.0596(3)(3)??IK1?IK1*?(3)?IK1*?11??16.79X?0.0596100?4.215KA3?230Sb3Uav?16.79?(3)iimp?2.55IK1?2.554.215?10.748KA(3)SK?IK1Uav?4.215?230?1.732?1643.235MVA(3)Iimp?1.151IK1?1.51?4.215?6.365KA
4、K2点短路分析
K2点短路时等值电路图如下:
X7*?
X2?2*?X3?2*?0.0083?(?0.008.3)???0.0042
X2?3*?X3?2*?0.0083?0.008323
X9*?X1*?X2?1*?X3?*0.125?0.125?0.0094??0.1565
X2?1*?X3?1*0.125?0.125经化简可得：
∴X?*?0.0613
(3)(3)∴IK2?IK2*?
(3)IK2*?11??16.313 X?*0.0613Sb3Uav?16.313?100?8.19KA
1.732?1158.?19?1151M6V3A.28 13)3I(k?1.73?2iimp?2.55Ik(3)2Uav2?2.55?8.19?20.88KA SK?Iimp?1.51Ik(3)2?1.51?8.19?12.367KA
5、短路计算成果表 (Sb?100MVA) 短路点 基准电压(KV) 短路冲基准电流击电流短路电流(KA) (KA) (KA) Ib?Sb3Ub短路容量(MVA) 短路全电流最大有效值(KA) 公式 K1 K2 K3 Ub?Uav 2.55I(3)K (3)(3)IK3?IK3*?Sb(3)(3) SK?3IKUav Iimp?1.51I9 3Uav230 115 10.5 0.251 0.502 5.499 10.748 20.88 92.49 4.251 8.19 36.269 1643.235 1631.25 659.59 6.365 12.367 54.766 二．10KV母线的母联断路器分闸运行 1、计算电路图如下:
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