Three-phase form-wound autotransformers

Main fields of application

  • Industrial

  • Power Electronics

  • Automotive

  • Electromedical

  • Railway and Marine

  • Data Center

  • Hydrogen and Renewable Energy

  • Power distribution

Main technical specifications

  • Power: 70 VA – 50.000 VA
  • Degree of protection: IP00
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Description

The three-phase form-wound transformers manufactured by GTS Elettrotecnica are an advanced, efficient and versatile solution, ideal for a wide range of industrial, commercial and civil applications, with power ratings ranging from 70 VA up to 50,000 VA.

The specific definition “on former” comes from the unique construction technique used to make these transformers. The concentric windings are arranged on specific hollow fiberglass formers, specially designed to accommodate the legs of the magnetic laminations, shaped in the characteristic E form. The magnetic circuit is finally completed by an I-shaped element, which securely closes the magnetic structure, ensuring maximum efficiency and excellent thermal management.

This construction system ensures uniform distribution of the magnetic flux, significantly reducing energy losses and improving the transformer’s overall efficiency. Particular attention is paid to defining the connection between the phases of the primary and secondary windings, as well as managing the required angular phase shift between the input and output voltage, allowing perfect adaptability to the specific needs of each installation. Resin impregnation and its polymerization complete the production process.

The three-phase transformers on former by GTS Elettrotecnica also stand out for their high degree of customization. Each model can be customized by varying input and output voltages, physical dimensions and accessory configuration, to fully meet the customer’s technical requirements.

Compliant with the most stringent international standards for safety, insulation and build quality, the three-phase transformers on former by GTS Elettrotecnica ensure reliability, high performance and long service life, representing an excellent technical solution for any type of application.

Main optional accessories

  • Electrostatic shields for protection against interference;
  • Integrated bimetal thermostat (Klixon) for temperature control;
  • PT100 thermocouples;
  • Lexan protection for electrical connections;
  • Fuse-holder terminals for additional protection;
  • Surge arresters;
  • Anti-vibration mounts and wheels;
  • Metal enclosure for higher IP protection ratings;
  • Tropicalized version or other.

    Technical specifications

    Rated power

    from 70 VA to 50000 VA

    Class of protection

    IP00

    Applicable standards

    CEI EN 61558-2-1
    CEI EN 61558-2-4
    CEI EN 61558-2-6
    CEI EN 61558-2-15
    CEI EN 60601-1-1
    CEI EN 60076-11
    UL/CSA upon request

    Insulation class

    Configurable according to the customer’s needs 

    Input/output voltages

    Configurable according to the customer’s needs 

    Conductors

    Single-pole, multi-pole (Litz wire), strip, used individually or in combination

    Winding materials

    Copper or Aluminum 

    Metalwork and fasteners

    Galvanized iron or stainless steel

    Cooling

    Natural air or forced air

    Overtemperature class

    B up to 2500VA power, above that Class F 

    Size examples

    Power Dimensions mm Weight Losses Power Dimensions mm Weight Losses
    VA A B H1 H2 Kg. W VA A B H1 H2 Kg. W
    70 120 75 125 2 14 6000 360 170 330 370 51 280
    100 120 85 125 2,7 20 7000 360 180 330 370 57 350
    150 150 79 152 5 24 8000 360 200 330 370 69 400
    200 150 79 152 5 26 9000 420 210 430 80 360
    300 150 94 152 6,2 33 10000 420 210 430 80 400
    400 180 110 170 6,8 40 12000 420 230 430 100 480
    500 180 120 170 8 42 15000 480 270 480 135 450
    750 180 130 170 10 68 17500 480 290 480 150 520
    1000 240 140 230 16 80 20000 480 300 480 164 600
    1500 240 150 230 19 84 22500 480 310 480 178 580
    2000 240 160 230 22 120 25000 480 320 480 192 630
    2500 240 175 230 26 150 30000 480 340 480 230 670
    3000 300 160 280 320 29 180 35000 600 310 580 250 840
    3500 300 170 280 320 33 200 40000 600 330 580 290 1000
    4000 300 180 280 320 38 210 50000 600 360 580 350 1250
    5000 300 200 280 320 47 250

    Dimensions vary depending on the number of inputs, the number of outputs, the current intensity, and the applicable Standards

    Custom builds according to the customer’s technical specification 

    Request a quotation

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