1电气主接线及所用高压接线设计1 - 图文(6)

2.3.3 500KV系统点相短路电流计算 正序网 <图十三>

12负序网 <图十四>

零序网 <图十五>

x2x1x7X▲

X2X1X7X2X1X7Uf(0)X8

XX?2?0??X2?X7?//X1?0.028??0.5?0.0084??0.026 0.5?0.028?0.0084???X2//X8??X7?//X1?0.017 ?2?X?0?0.026?0.017?0.043

X??X?111??XG1f?X1X?????0.073 ?X??1X2?X7X??XG2f??X2?X7?X????111?????1.33 ??X2?X7X1X??计算电抗 计算电抗

Xijs1?XG1fSN118000?0.073??13.14 SB100SN2100?1.33??1.33 SB100Xijs2?XG2f查曲线求得 1I1??0.0761

13.14I2?0.77

?1?ID?5?0.0761180003?525?0.77?1003?525?1.586KA

?1?I\?3IDKA 5?3?1.586?4.758 单相短路 三相短路 Itk Itk/2

500KV(KA) 4.758 4.139 4.75 4.765 220KV(KA) 10.92 7.4 10.85 20.586 35KV(KA) 0 9.85 9.85 9.85

第三章 电气设备选择