Step Down Transformer for Outdoor Power Systems

Waterproof treatment of buried substation

The underground combination transformer with the change of the ground box allows the immersion in the water, and the waterproof and drainage of the pit is fully designed within the foundation of the pit. For areas with a low groundwater level (lower than the bottom of the pit) The pits structure, the ventilation holes on the top of the pit have effective ventilation and rainproofing capacity. Putting water sand pebbles on the bottom of the pit, water can directly penetrate the ground. For areas with high groundwater level (higher than the bottom of the pit), use The prefabricated fully enclosed concrete pit structure prevents the inflow of surface water and the infiltration of groundwater into the ground pits.

(1) The foundation of the pit can be formed with steel plates above 6mm or more to ensure that the surface water and other debris cannot enter the pit: prefabricated reinforced concrete structure can also be adopted, and advanced waterproof technology can be used leakage.

(2) There is a set of pools at the bottom of the pit, and a submersible pump controlled by an automatic non-water system is installed.

(3) Install a high and low voltage cable installation stand in the pit, which is convenient for the cable installation and fixation.

(4) Waterproof lighting is installed in the pit for easy maintenance.

(5) The foundation top cover has open maintenance holes.

Advertising light box -type outdoor switch equipment

(1) The protective shell of the switching device adopts an advertising light box structure. The two doors of the light box housing can be opened at all angles, and the pneumatic spring support positioning is convenient for the operation and maintenance of the switching equipment.

(2) The light box is equipped with heat insulation, which has a good heat insulation effect.

(3) The two sides of the lamp box housing are advertising boards, and LED emitting elements with small size and uniform light sources are used.

(4) The door locks of the advertising light box and the switching equipment are set independently. The maintenance of the light box does not affect the operation of the switch equipment.

(5) A sound and light alarm device with the shell of the light box, which is damaged by the outside world. Alarm signal can be issued.

(6) The switching equipment adopts a double -layer door structure, the protection level reaches IP34, and the second floor is the instrument door to ensure that after the light box -type shell is destroyed, the low pressure cabinet still reaches the protection level of a complete and independent outdoor low -pressure product.

(7) The fan hidden in the light box shell can automatically exhaust the air and send air supply to reduce temperature and dehumidification in the pit foundation.

Heat dissipation of buried substation

(1) The underground transformer uses low-loss iron-hearted, rolled iron-hearted or amorphous alloy iron heart products. The air load loss and load loss are largely reduced, so the heat is low.

(2) High heat-resistant levels of transformers have a high degree of temperature rise, and also improved the transformer's overload ability.

(3) The underground transformer uses a cyclotrophic transformer oil (or high-combustion point oil) to ensure that the product has good heat dissipation capabilities.

(4) Between the power distribution box and the basic ground pits, a air inlet and outlet are set up. When the temperature rise of the local underground combination transformer reaches the set value, it will be given to the air supply.