The underground transformer can be installed in the pit below the outdoor ground level to avoid direct contact with the public. The product adopts full insulation structure to ensure personal safety. The tank adopts a fully sealed structure, which can resist flood disasters and effectively improve the reliability of the power supply system. It does not occupy the ground surface area after installation, which can be harmonious with the environment, and also meets with the high waterproof requirement of underground power grids.
Product Features
- Suitable for urban environment (installed in basement or cellar), especially suitable for densely populated central cities.
- Suitable for lighting systems and power systems for streets, highways, bridges, tunnels, parking lots, airports, seaports, tourist attractions, etc.
- Both high and low-voltage terminals are fully insulated ,waterproof and shielded.
- The enclosure is made of anticorrosive steel plate or stainless steel plate, fully sealed and submerged in water for a period of time.
- The protection system fully considers the convenience and safety, the accessories from American COOPER company or adopt high-quality Chinese products with the same performance.
- The underground transformer is operated by the operating rod, which has the same operation mode as the combined transformer.
- Fully consider the particularity of heat dissipation conditions, the underground transformer adopts low loss and low temperature design.
- The transformer cellar is equipped with a protection device to prevent water from entering and an automatic drainage device.
El transformador subterráneo se puede instalar en el foso debajo del nivel del suelo exterior para evitar el contacto directo con el público. El producto adopta una estructura de aislamiento total para garantizar la seguridad personal. El tanque adopta una estructura completamente sellada, que puede resistir desastres por inundaciones y mejorar efectivamente la confiabilidad del sistema de suministro de energía. No ocupa la superficie del suelo después de la instalación, lo que puede ser armonioso con el medio ambiente y también cumple con el alto requisito de impermeabilidad de las redes eléctricas subterráneas.
Características del producto
1.Adecuado para entornos urbanos (instalado en sótano o bodega), especialmente adecuado para ciudades centrales densamente pobladas.
2.Adecuado para sistemas de iluminación y sistemas de energía para calles, carreteras, puentes, túneles, estacionamientos, aeropuertos, puertos marítimos, atracciones turísticas, etc.
3.Tanto los terminales de alto como de bajo voltaje están completamente aislados, son impermeables y blindados.
4. El gabinete está hecho de placa de acero anticorrosivo o placa de acero inoxidable, completamente sellada y sumergida en agua durante un período de tiempo.
5. El sistema de protección considera completamente la conveniencia y seguridad, los accesorios de la compañía American COOPER o adoptan productos chinos de alta calidad con el mismo rendimiento.
6. El transformador subterráneo es operado por la varilla de operación, que tiene el mismo modo de operación que el transformador combinado.
7. Considere completamente la particularidad de las condiciones de disipación de calor, el transformador subterráneo adopta un diseño de baja pérdida y baja temperatura.
8.La bodega del transformador está equipada con un dispositivo de protección para evitar la entrada de agua y un dispositivo de drenaje automático.
Prefabricated pit foundation.
- Pit foundation: pre-compression molding with steel plates above 6mm and fully sealed structure can be used to ensure that surface water and other debris cannot enter the pit, also can adopt prefabricated reinforced concrete structure, and advanced waterproof technology is used to ensure that the foundation does not leak.
- A sump is set at the bottom of the pit, and a submersible pump controlled by the automatic drainage system is installed.
- High and low voltage cable mounting brackets are installed in the pit to facilitate cable installation and fixation.
- Fireproof lights are installed in the pit for easy maintenance.
- The top cover of the foundation is provided with an openable inspection hole.
- A fan is installed between the ground power distribution cabinet and the foundation pit, so that the pit and the outside air can be interchanged. When the temperature rise of the underground combined transformer reaches the set value, the fan will automatically start to perform forced air exhaust to ensure the normal operation of the transformer and high and low voltage switchgear.
Underground transformer
- The cabinet is made of stainless steel, fully sealed, and has a protection level IP68, can be immersed in water for operation.
- Both high and low-voltage terminals are fully insulated ,waterproof and shielded which makes the operation safer.
- Use naphthenic transformer oil to ensure good heat dissipation capacity.
- Adopt low loss value design, energy saving effect is remarkable.
- High insulation and heat resistance capacity, environmentally friendly.
- Back-up and plug-in fuse, to give the transformer safer protection.
- The load switch has two, three, and four positions and is suitable for a variety of power supply systems.
| Main Technical Parameters of Underground Transformers |
Rated capacity
(KVA) |
No-load loss
W |
Load loss
(75°) W |
No-load current
(%) |
Impedance Voltage (%) |
| 30 |
91 |
600 |
0.63 |
4 |
| 50 |
119 |
870 |
0.60 |
| 63 |
140 |
1040 |
0.57 |
| 80 |
168 |
1250 |
0.54 |
| 100 |
203 |
1500 |
0.48 |
| 125 |
238 |
1800 |
0.45 |
| 160 |
280 |
2200 |
0.42 |
| 200 |
336 |
2600 |
0.39 |
| 250 |
392 |
3050 |
0.36 |
| 315 |
469 |
3650 |
0.33 |
| 400 |
560 |
4300 |
0.30 |
| 500 |
672 |
5100 |
0.30 |
| 630 |
810 |
6200 |
0.27 |
4.5 |
| 800 |
980 |
7500 |
0.24 |
| 1000 |
1150 |
10300 |
0.21 |
| 1250 |
1360 |
12000 |
0.18 |
| 1600 |
1640 |
14500 |
0.18 |
| 2000 |
1960 |
17820 |
0.30 |
| 2500 |
2310 |
20700 |
0.25 |
5.5 |
| Test and Inspection Equipments |
* More than 20 years manufacturing experience in electric power industry
* Top quality products, ISO9001, ISO14001, KEMA, CNAS certificates
* Custom tailored products, OEM & ODM are welcome
* Challenging prices for giving customers the greatest benefits
* Fast response time, we promise to reply customer's email within 24 hours
* Attractive lead times, plenty of equipments and workers to ensure the delivery on time
* Top skilled technicians
* Flexibility
WORTAI have been sold to over 20 countries and regions, spread all over Asia, Africa, Middle & South America, Middle East and Europe, we also has done OEM service for some world famous brands.Choosing WORTAI means being one step ahead of the general development. We look forward to a closer relationship and mutually beneficial cooperation with any prospective customers in the near future. WORTAI will work with you shoulder-to-shoulder to satisfy your needs.With competitive price, good quality and best service, WORTAI will be your most wise choice. Together we're winners! Let's do it right now!
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