The Distribution Cabinet Realizes The Internal Hierarchy Of A Three-level Power Distribution Structure.

The three-level power distribution structure originates from the rational division of power supply paths, progressively transmitting power from higher levels to end-user equipment. The main distribution cabinet, as the highest-level node, draws power from the grid or transformer and branches it out to multiple distribution units.

In the second level, the distribution boxes, located after the main distribution cabinet, are responsible for intermediate power supply to specific areas or systems. These boxes are equipped with circuit breakers, disconnect switches, and other components to branch the power from the main distribution cabinet and distribute it to finer circuits according to on-site power requirements.

The third level extends from the switch boxes to the specific electrical equipment. The switch boxes are responsible for directly connecting the circuits from the distribution boxes to the power supply terminals of the end equipment and contain necessary protection and control devices. This hierarchical arrangement forms a three-level distribution relationship from main to branch to end-user.

In engineering implementation, this architecture manifests as a progressive power transmission path from high-voltage power supply to low-voltage electrical equipment. The three-level distribution model is common on construction sites and inside buildings, where each level is physically associated with its corresponding Powbinet, making the logical relationship between electrical wiring and control systems clear.