Introduction
The lightbox-type underground box transformer is mainly composed of two parts: an underground transformer (including a prefabricated pit) installed below ground and an outdoor advertising lightbox-type high and low voltage switchgear installed above ground. The underground transformer is a new type of distribution transformer with high-voltage fuse protection, which can operate submerged in water for a certain period of time. It has been widely used in airports, highways, bridges, tunnels, and other locations in China. The outdoor lightbox-type high-voltage and low-voltage switchgear consists of outdoor high-voltage and low-voltage distribution cabinets inside the box and advertising lightboxes on the exterior. The content of the advertising images can be designed according to the surrounding environment and user requirements. The entire product occupies a small area, is aesthetically pleasing, and not only blends seamlessly with the surrounding environment but also serves an advertising function.

Model meaning


Use conditions
>Altitude: not above 1000m;
>Ambient temperature: max:
>Min: -25℃;
>Relative humidity: daily average not above 95%; monthly average not above 90%;
>Place with installation gradient not above 3° and without frequent violent vibration impact;
>Ambient air free of explosiveness, not obviously pullulated by corrosive inflammable gas.

Technical parameters


Outline dimension drawing


Note
>The product consists of an underground transformer, a lightbox-type outdoor high/low voltage switch cabinet, and a prefabricated pit.
> The lightbox-type outdoor high/low voltage switch cabinet features a double-door design, ensuring that the high and low voltage equipment remains protected by an independent case even if the lightbox is damaged.
> The prefabricated pit is designed to be fully sealed and waterproof. The pit cover is laid with highly decorative tiles and is equipped with a lockable manhole cover plate.
> The high-voltage and low-voltage sides of the underground transformer both adopt a connection method that allows simultaneous insertion and removal of three-phase cables. The sealing performance reaches the IP68 level, enabling the transformer to operate submerged in water for a long time.