三相短路
两相短路
哪里：
•Sk
是故障点处的短路视在功率；
•Ur
是额定电压。
确定短路视在功率Sk
，网络的所有元素
应考虑以下因素：
•产生短路电流的元件：
网络、发电机、电机；
•限制短路电流值的元件：
导线和变压器。
短路电流的计算程序包括
以下步骤：
1、变压器不同元件的短路功率计算
安装
2、计算故障点短路功率；
3、短路电流的计算。
6.3.1变压器不同元件的短路功率计算
安装
短路视在功率Sk
应为所有部件确定
这是安装的一部分：
网络
电网被认为包括该点上游的一切
能源供应。
可以消除短路电流

Three-phase short-circuit Two-phase short-circuit where: • Sk is the short-circuit apparent power seen at the point of the fault; • Ur is the rated voltage. To determine the short-circuit apparent power Sk , all the elements of the network shall be taken into account, which may be: • elements which contribute to the short-circuit current: network, generators, motors; • elements which limit the value of the short-circuit current: conductors and transformers. The procedure for the calculation of the short-circuit current involves the following steps: 1. calculation of the short-circuit power for the different elements of the installation; 2. calculation of the short-circuit power at the fault point; 3. calculation of the short-circuit current. 6.3.1 Calculation of the short-circuit power for the different elements of the installation The short-circuit apparent power Sk shall be determined for all the components which are part of the installation: Network An electrical network is considered to include everything upstream of the point of energy supply. The short-circuit current can be de