Nacional de Transformers - TESLA offers equipment for underground installation type occasional and totally submersible , up to 2000 kVA in series 34.5 kV and 15 kV , higher powers are also manufactured under special design and application requirements. This equipment is intended to be installed in chambers or vaults below ground level , where there is the possibility of occasional immersion in water.

The accessories are located on the main cover of the transformer tank, all its external components are suitable to operate in the presence of humidity and eventual flooding. For fully submersible equipment, TESLA guarantees a degree of protection IP66 both for the tank, which is made of stainless steel sheet, and for the protection of the accessories and pre-molded components.

They are classified into radial type and mesh (ring), according to the type of circuit specific to each project. Depending on the type, the transformer has one or more disconnectors, protection fuses sensitive to excessive load currents or oil temperature, and current limiting backup fuses; pre-molded type connection terminals and elbow type surge arresters, among other accessories.

They are designed with a temperature rise of the windings of 55 ° C and temperature in the upper part of the oil of 55 ° C or less, material of the windings: copper / copper , copper / aluminum , aluminum / aluminum .

Transformers suitable for supplying electrical energy requirements in areas where space is not available and where underground installation must be used in sectors such as:

• Residential buildings

• Urbanizations

• Malls

• Hospitals

• Education centers (colleges, universities)

• Integrated mass transportation systems.