BEST is capable of manufacturing cast resin dry type transformers with below given technical characteristics according to customer requirements.

Insulation Material Temperature Classes: F (155°C) and H (180°C)

Low Voltage Winding Technology: Pre-impregnated with heat-activated epoxy resin

                                                  Casted with epoxy resin under vacuum

High Voltage Winding Technology: Casted with quartz filled epoxy resin under vacuum
                                                   Casted with glass-fibre reinforced epoxy resin under vacuum

Product range of BEST reaches 30MVA and 52kV class by it’s dedicated manufacturing facility and engineering capabilities. 

Advantages of cast resin dry type transformers:

           • High overload capability
           • Excellent endurance to short circuits and seismic conditions
           • Flexibility during engineering to fulfill customer’s expectations
           • Installation at harsh environmental conditions (very low ambient temperatures, high humidity) possible
           • Long-time overload up to %40 with fan system. 

Application Field

BEST manufactures standard distribution transformers with normal, low and very low losses from 160kVA to 3150kVA and system voltage up to 36kV and power transformers from 4MVA to 30MVA up to 52kV.

Special Application Fields: 

        • Power transformers
        • Renewable energies (wind and photovoltaic)
        • Traction applications
        • Rectifier transformers with 3 or 4 windings
        • Marine
        • Oil and gas platforms
        • Industrial cranes
        • Transformers with on-load tap changer
        • Earthing transformer
        • Excitation transformers
        • Transformers for mobile substations
        • Generator step-up
        • Auto transformers
        • Monophase transformers 


When requested, BEST is also capable of delivering the transformers with enclosures suitable for indoor/outdoor environment with protection degree of IP20 up to IP55. Cable/ busbar connections to the transformer with enclosure can be maintained according to customer’s request. (Connection by air filled cable termination box, cable/busbar entrance from top/bottom/side, etc.)

IP21                             IP21                                IP31

IP31                                                                    IP31



Standard Accessories

          • Temperature control system
                  * PT-100 temperature sensors at each LV coil
                  * Digital temperature control relay with 2 contacts
                           * Digital display
                           * Automatic control of fans if they’re present
                           * Alarm and trip signals are generated if the temperature exceeds pre-set values
                           * Types with ability for connection to SCADA system (Optional)

Optional Accessories

          • Fan system
                  *  %40 power increase for short period of time is possible
                  * Automatically controlled by temperature control system

          • Anti-vibration pads
          • Surge arresters
          • Space heaters
          • Plug-in bushings, Bushings
          • Current transformers
          • Marshalling box
• Cover for tapping area