110KV智能自动化变电站设计(7)

图5-2

三相变压器：

US11%?US21%?1?US(1?2)?US(3?1)?US(2?3)??1?10.5?17.5?6.5??10.75 221?US(1?2)?US(2?3)?US(3?1)??1?10.5?6.5?17.5???0.25 221?US(2?3)?US(3?1)?US(1?2)??1?17.5?6.5?10.5??6.75 22

US12%?US22%?

US13%?US23%?**则：XX11?XX21?US11?SB10.75?100??0.43

100SN100?25**XX12?XX22?0

**XX13?XX23?US13?SB6.75?100??0.27

100SN100?25*XL1?XL1SB100?4.8??0.0363 2UAv1152SB100?12??0.0907 22UAv115*XL2?XL2 24

*XL3?XL3SB100?0.5?32??0.1210 22UAv115SB100?10??0.0756 2UAv1152*XL4?XL4*XS1?XS1SB100?0.6??0.3 UN1200SB100?0.6??0.05 UN21200*XS2?XS2计算后等值电路如下

图5-3

5.4.1 110kv侧母线短路计算 网络为：

25

图5-4

△/Y变换：

图5-5

Y/△变换：

图5-6

则有：

图5-7

*XJS1?X1SN1200?0.384??0.768 UB100SN21200?0.2679??1.5348 UB100*XJS2?X2***查计算曲线数字表可得：I1，，?1.360I?1.284I?0?1?1?1?2??1.464

26

***，，I2?0.70I?0.671I?0?2?1?2?2??0.671

换算成有名值为：

I?0??I1*(0)?I?1??I1*(1)?SN13UAvSN13UAv*?I2(0)?SN23UAvSN23UAv?1.360?2003?115?0.7?12003?115?5.5827KA

*?I2(1)??1.284?2001200?0.671??5.3317KA 3?1153?115I?2??I1*(2)?SN13UAv*?I2(2)?SN23UAv?1.464?2003?115?0.671?12003?115?5.5124KA

Ich?2.55I(0)?2.55?5.5827?14.2359KA 5.4.2 35kv侧母线短路计算

图5-8

图5-9

27

Y/△变换：

图5-10

图5-11

*XJS1?X1SN1200?0.9074??1.8148 UB100SN21200?0.6329??7.5948>3.45 UB100*XJS2?X2***查计算曲线数字表可得：I1?0??0.5653，I1?0.5??0.5793，I1?1??0.5793

换算成有名值为：

I?0??I1*(0)?I?0.5??I1*(0.5)?SN13UAvSN1*?I2(0)?SN23UAvSN2?0.5653?2003?37?11200??4.2297KA7.59483?373UAv*?I2(0.5)?3UAv?0.5793?20011200???4.2734KA7.59483?373?37I?1??I1*(2)?SN13UAv*?I2(1)?SN23UAv?0.5793?20011200???4.2734KA3?377.59483?37Ich?2.55I(0)?2.55?4.2297?10.7857KA

28

百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说综合文库110KV智能自动化变电站设计(7)在线全文阅读。