短路耐受强度的验证基于两个值
制造商在相互替代的情况下声明：
-额定短时电流Icw
-额定条件短路电流Ik
根据这两个值中的一个，可以确定
配电盘适合安装在系统的特定位置。
有必要验证断路器的断开能力
配电盘内的设备与短路兼容
系统的价值观。
额定短时耐受电流Icw是相关电流的r.m.s.值
在不打开保护装置的情况下，进行1s的短路试验
由组件制造商提供，可由组件携带，无需
根据电流和时间定义的特定条件下的损坏。
不同时间（例如0.2秒；3秒）的不同Icw值可分配给
装配配电盘应能够承受热应力和电动应力，而不会造成损害或变形
系统的运行。通过该测试（如果通过），可以获得
比通过能（I2
t） 可由配电盘承载：
我
2.
t=Icw2
T
该试验应在下文中规定的功率因数值下进行
标准IEC 61439-1的表4。对应于该cosñ值的系数“n”
允许确定断路器承受的短路电流峰值
通过以下公式：
Ip=Icw。N
表4
功率因数
r、 短路电流的m.s.值cosñn
我≤ 5千卡0.71.5
5<I≤ 10千卡0.51.7
10<I≤ 20千卡0.32
20<I≤ 50千卡0.25 2.1
50<I 0.2.2
此表的值代表大多数应用程序。在特殊地点，例如
例如，在变压器或发电机附近，功率因数可能较低
由此，大预期峰值电流可能成为极限电流
而不是短路电流的r.m.s.值。
条件短路电流是测试电流的预定r.m.s.值
定义的峰值对应，且可通过
配电盘在特定保护装置的运行时间内。这
设备通常是配电盘的主断路器。
通过比较两个值Icw和Ip与预期短路电流
对于工厂，可以确定配电盘是否适合安装
安装在系统的指定点。
下图显示了确定组件兼容性的方法
工厂的总机。


The verification of the short-circuit withstand strength is based on two values stated by the manufacturer in alternative to each other: - the rated short-time current Icw - the rated conditional short-circuit current Ik Based on one of these two values, it is possible to determine whether the switchboard is suitable to be installed in a particular point of the system. It shall be necessary to verify that the breaking capacities of the apparatus inside the switchboard are compatible with the short-circuit values of the system. Rated short- time withstand current Icw is the r.m.s. value of the current relating to the short-circuit test for 1 s without openings of the protections, declared by the assembly manufacturer, that can be carried by the assembly without damage under specified conditions, defined in terms of a current and time. Different Icw values for different times (e.g. 0.2 s; 3 s) may be assigned to an assembly. The switchboard shall be able to withstand the thermal and electrodynamical stresses without damages or deformations which could compromise the operation of the system. From this test (if passed) it is possible to obtain the specific let-through energy (I2 t) which can be carried by the switchboard: I 2 t = Icw2 t The test shall be carried out at a power factor value specified below in the Table 4 of the Std. IEC 61439-1. A factor “n” corresponding at this cosϕ value allows to determine the peak value of the short-circuit current withstood by the switchboard through the following formula: Ip = Icw . n Table 4 power factor r.m.s. value of short-circuit current cosϕ n I ≤ 5 kA 0.7 1.5 5