保定市伊诺尔电气设备有限公司

在选择电力电缆的截面时，应遵照哪些规定？

What are the requirements for selecting the cross section of the power cable?

电力电缆的选择应遵照以下原则：

The selection of power cables shall comply with the following principles:

（1）电缆的额定电压要大于或等于安装点供电系统的额定电压；

(1) the rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system of the installation point;

（2）电缆持续容许电流应等于或大于供电负载的最大持续电流；

(2) the continuous permissible current of a cable shall be equal to or greater than the maximum sustained current of the power supply;

（3）线芯截面要满足供电系统短路时的稳定性的要求；

(3) the core section should meet the requirement of stability when the power supply system is short circuited;

（4）根据电缆长度验算电压降是否符合要求；

(4) check whether the voltage drop meets the requirements according to the cable length;

（5）线路末端的最小短路电流应能使保护装置可靠的动作。

(5) the minimum short-circuit current at the end of the line shall enable the protection device to act reliably.