Box-type substations can be categorized into two types: standard and compact. Standard box-type substations include the ZBW and XWB types, while compact box-type substations include the ZB1-336 and GE box-type substations. The 10kV distribution system in box-type substations does not utilize circuit breakers. Commonly used devices include FN5-10 or FN7-10 load switches with fuses and a ring network power supply. Connections are made from adjacent overhead lines to the high-voltage side of the transformer. Depending on the product structure and components used, they are typically categorized into European-style box-type substations and American-style box-type substations.
ZBW Box-Type Substation
The ZBW-10/0.4kV outdoor modular substation is a prefabricated, complete power distribution system consisting of a high-voltage compartment, a transformer compartment, and a low-voltage compartment. It is suitable for ring network, dual-line, and terminal power supply methods, offering excellent interchangeability. Cables are used for incoming power. The high-voltage compartment features a fully reliable and compact design with comprehensive interlocking features to prevent misoperation, ensuring high reliability and easy operation and maintenance. It is compatible with terminal load switches, air ring main switches, and SF6 ring main units. Satons transformers can be oil-immersed or dry-type. The transformer compartment is temperature-controlled and can utilize natural or top forced ventilation. The low-voltage compartment is equipped with metering and reactive power compensation, and the secondary circuit and number of outgoing lines can be customized to meet diverse needs.
GE Box-Type Substation
The GE box-type substation differs from domestic modular box-type substations in that it is developed based on a transformer. The GE box-type substation simplifies the structure of the transformer core, high-voltage load switch, and fuses, housing them in a single oil-filled iron box. Its compact size and structure require only about one-third the floor space of domestic box-type substations of the same capacity. Its fully sealed and insulated structure eliminates the need for insulation distances, ensuring reliable personal safety. The high-voltage cables are routed through well-insulated bushings, which connect to elbow-type cable plugs, sealing the live parts within the insulation. Elbow-type cable plugs can be plugged in and out while the transformer is fully loaded, acting as a load switch. There are many different types available, so choose carefully when choosing for your specific application. Wall mounts are welded to the enclosure to hold the insulated bushing connector. When the elbow-type cable plug is removed, it can be plugged into the bushing connector.