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三相短路
兩相短路
哪里：
•Sk
是故障點(diǎn)處的短路視在功率；
•Ur
是額定電壓。
確定短路視在功率Sk
，網(wǎng)絡(luò)的所有元素
應(yīng)考慮以下因素：
•產(chǎn)生短路電流的元件：
網(wǎng)絡(luò)、發(fā)電機(jī)、電機(jī)；
•限制短路電流值的元件：
導(dǎo)線和變壓器。
短路電流的計(jì)算程序包括
以下步驟：
1、變壓器不同元件的短路功率計(jì)算
安裝
2、計(jì)算故障點(diǎn)短路功率；
3、短路電流的計(jì)算。
6.3.1變壓器不同元件的短路功率計(jì)算
安裝
短路視在功率Sk
應(yīng)為所有部件確定
這是安裝的一部分：
網(wǎng)絡(luò)
電網(wǎng)被認(rèn)為包括該點(diǎn)上游的一切
能源供應(yīng)。
可以消除短路電流

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