220kV变电站设计讲解

① 1d 点短路: 转移电抗:111

0.01290.02450.14150.17892d d L X X X '=+=++= 计算电抗:135000.03741.309100 S jS

d B S X X S =?=?=<3

查 《电力工程电气设计手册》 电气一次部份 1上册 P135表 0* 0.793I ''= 1*0.831I ''= 2* 0.836I ''= 则有名值: 0* 0*0.7936.49( I I kA ''''===, 1* 11*3500

0.8317.301( 1.732230 B I I I I kA ''''''=?==?

=? 1* 11*3500

0.8367.345( 1.732230 B I I I I kA ''''''=?==? =? 冲击电流:1

2.552.556.4915.54( sh i I kA ''=?=?= 短路容量:2206.492472.94( d N S I MVA ''=?= 全电流最大值:1.511.516.499.79( ch I I kA ''==?= ② 2d 点短路:

转移电抗:211211

0.01290.0245(0.1740.109 0.178922d d X X X X =++=+++= 计算电抗:23500 0.17896.262100

S jS d B S X X S =?=?=>3

25.5895.5891.403B I kA ===(

冲击电流:2.552.551.4033.578( sh i I kA ''=?=?=

短路容量:2301.403534.59( d N S I MVA ''=?= 全电流最大值:1.511.511.4032.12( ch I I kA ''==?= ③ 3d 点短路:

转移电抗:31131

0.01290.14150.02450.17892d d X X X X =++=++= 计算电抗:33500 0.17896.262100

S jS d B S X X S =?=?=>3

此时可将系统等效为无限大系统,短路电流不衰减 *

1243115.5890.1789 d I I I I X ***''====== 31.561B I kA = ==( 24*

35.5891.5618.72( B I I I I I kA ''''===?=?= 冲击电流: 2.552.558.7222.24( sh i I kA ''=?=?=