江苏春晨电缆有限公司生产春晨YFFB扁电缆，

配电线路对保护电器的要求

Demand for protective electrical appliances in distribution lines

配电线路通常有树干式和放射式两类，还有两者的混合系统。低压保护电器按在配电线路中的安装位置和重要性分为三级：低压主开关柜内保护电器、一般配电开关柜内保护电器和终端配电箱内保护电器。配电线路对各级低压保护电器的要求如下：

Distribution lines usually have two kinds: trunk type and radiation type, and there is a mixed system of them. Low voltage protection electric appliances are divided into three levels according to the position and importance of installation in distribution lines: protection electric appliances in low voltage main switchgear, protective appliances in general switchgear cabinet and protective appliances in terminal distribution box. The requirements for distribution lines to all levels of low voltage protective appliances are as follows:

1）低压主开关柜内保护电器春晨YFFB扁电缆

1) low voltage main switch cabinet protection electric appliance

低压主开关柜内保护电器应把供电的性放在主要位置，以确保连续供电，由于低压保护电器接近电力变压器，分配出母线的容量特别大，因此要求它既应与电力变压器一次侧的高压熔断器的保护特性配合，又应与下级保护电器尽可能实现全选择性保护配合。

The protective electrical apparatus in the low voltage main switchgear should put the reliability of the power supply in the main position to ensure continuous power supply. Because the low voltage protection electric appliance is close to the power transformer, the capacity of the distribution of the bus is especially large, so it should be combined with the protection characteristic of the high voltage fuse of the primary side of the power transformer and the protection of the lower grade. Electrical appliances can achieve full selective protection as far as possible.

2）终端配电箱内保护电器

2) protective appliance in terminal distribution box

终端配电箱直接连接用电设备，短路或接地故障时要求尽快甚至瞬时切断电路，无选择性要求。终端配电箱内的低压保护电器应设短路和接地故障保护，而线路末端则不必设短路，而是根据所接用电设备需要装设控制电器或用电设备的过载保护电器。春晨YFFB扁电缆

The terminal distribution box is directly connected to the electrical equipment. When short circuit or earthing failure occurs, it is required to cut off the circuit as soon as possible or even instantaneously without selectivity. The low voltage protection apparatus in the terminal distribution box should have short circuit and grounding fault protection, while the end of the line does not have to set short circuit, but should install the overload protection electric appliance or electrical equipment according to the electric equipment