一级配电设备，统称为动力配电中心。它们集中安装在企业的变电站，把电能分配给不同地点的下级配电设备。这一级设备紧靠降压变压器，故电气参数要求较高，输出电路容量也较大。
Primary distribution equipment, collectively known as power distribution center.They concentrated installed in the transformer substation of the enterprise, the power allocated to different locations of the lower power distribution equipment.This level close to the step-down transformer equipment, so the electrical parameters of the demand is higher, the output circuit capacity is bigger also.