图4-14 距1号断路器15%处短路时的等效正序化简网(1)
图4-15 距1号断路器15%处短路时的等效正序化简网(2)
1??XA???0.234?0.726?//0.168?0.309?//?5.43??0.962?1.675???0.424
2??X1??(XA?0.478)//0.52?0.756?//0.3?15%?0.605?0.326 X2??4.74?0.139?//?0.588?0.614??85%?0.605?1.479 X1??X1//X2?0.326//1.479?0.267
零序网：
图4-16 距1号断路器15%处短路时的等效零序网
图4-17 距1号断路器15%处短路时的等效零序化简网(1)
图4-18 距1号断路器15%处短路时的等效零序网(2)
XA???0.411?2.178?//0.1715?0.927?//?7.867?0.962?1.675??0.986 X1??(XA?1.434)//0.687?2.268?//0.306?15%?1.815
??(0.986?1.434)//0.687?2.268?//0.306?15%?1.815?0.548
X2??2.494//(0.575?0.412)?0.417?//0.588?85%?1.815?1.929
X0??X1//X2?0.548//1.929?0.427
X1??X0? ，所以采用两相接地的零序电流：
3I10?1,1??X1?3E3?1??2.676 ?2X0?0.267?2?0.427∴ 流过保护1QF的最小零序电流3I0,min为： 3I10,min?3I1?1,1?IB0X21.929?2.676?2.510??5.231X1?X21.929?0.548
（KA）
2）对于: 在距2号断路器15%处短路时流经2号断路器的最小零序电流3I1,min；在距7号断路器15%处短路时流经7号断路器的最小
0零序电流3I1,min；在距8号断路器15%处短路时流经8号断路器的
0最小零序电流3I1,min的计算原理与4.5（2）相同,计算结果如表4-4
0所示。
3）B母线短路时流经1号断路器的最小零序电流3I1,min
0正序网：
图4-19 B母线短路时的等效正序网
图4-20 B母线短路时的等效正序化简网
1??XA???0.234?0.726?//0.168?0.309?//?5.43??0.962?1.675???0.424
2??X12?X1X20.605?0.3780.229???0.204
X1?X2?X30.605?0.378?0.1391.122X1X30.605?0.139X13???0.075
X1?X2?X31.122X23?X2X30.378?0.139??0.047
X1?X2?X31.122??????0.424?0.478?//0.52?0.756??//0.3?0.204?//?XXB?0.588?0.614?1.202 X1??X4//XB?0.477//1.202?0.341
X4????XA?0.478?//0.52?0.756??//0.3?X12//?X23?4.74??X1323??4.74??0.075?0.477
零序网：
图4-21 B母线短路时的等效零序网