Class H open dry transformers

Nacional de Transformers - TESLA designs and manufactures open dry three-phase transformers with class H insulation in powers from 30 kVA to 5 MVA and voltage levels up to 36 kV .

TESLA is a specialist in the manufacture of low voltage transformers series 1.1 / 1.1 kV, medium voltage 36 / 1.1 kV and 15 / 1.1 kV, according to the NTC, IEC-EN or ANSI standard.

They are designed with a temperature rise of the windings 125 ° C or less, cooled by natural or forced air, winding material: Copper / Copper , Copper / Aluminum , Aluminum / Aluminum .

K-factor designs for harmonic control. (K1, K2, K4, K6, K9, K13, K20, K30), low losses in the core and in the windings, predisposed for indoor installation with protection cell ( IP 20 to IP 40 ) and outdoor installation with protection NEMA 4 and IP 55 .

Low voltage coils are manufactured on automatic power winding machines. The conductive materials generally used are tape (foil) or rectangular plate, with class H insulation (180 ° C) ; the medium voltage coils are manufactured in comb type biscuits with enameled round wire and; They are manufactured on high speed and precision automatic machines.

The magnetic core is made of grain oriented electrical steel, high magnetic permeability and low losses. Each sheet of magnetic steel is insulated by a thin layer of organic material (Carlite), the cut is 45 degrees and its columns are stacked using the " Step Lap " method, reducing hysteresis losses and vacuum currents, guaranteeing low noise level.

On request, a temperature monitor with thermocouples type PT 100 and a connection box for thermal protection of the transformer is supplied. They are delivered or installed SPD for protection against overvoltages and forced ventilation system for power increase of up to 30% of the nominal value; There are also bimetallic connectors for the connection of the copper - aluminum connection or vice versa.

Transformers suitable to meet the electrical energy requirements in sectors such as: