Currently, railway power distribution networks increasingly use cable power supply. Sometimes, situations arise where independent loads with relatively small capacities are concentrated. In such cases, cable branch boxes are typically used to connect multiple cable branches. This is because cable branch boxes cannot directly operate on each line; they only serve to branch the cables. The main functions of a cable branch box are twofold: cable transfer and cable splitting.
Cable Splitting: When a power distribution line is long, using many small-area cables would be wasteful. Therefore, when the line goes out to the load, we usually choose a main cable, and then near the load, we use a cable branch box to branch the main cable into many smaller-area cables, which are then connected to the load.
Cable Transfer: When the power distribution distance is long, the cable length itself cannot meet the requirements for long distances. Therefore, cable joints or cable transfer boxes must be used for connection. Typically, cable joints are used for power distribution distances not exceeding 3000m. However, for cable lines exceeding 3000m, using numerous joints increases safety risks. Therefore, to ensure power supply safety, cable distribution boxes are usually used for connection.
Cable distribution boxes facilitate the connection of cables with different cross-sections, eliminating the complex process of cable joints, improving the cable connection environment, ensuring connection quality, and facilitating subsequent routine inspection and maintenance.