12,5MVA and 72,5kV and above, oil-immersed transformers are described as Power Transformers. Power transformers require distinct expertise and experience in particularly insulation and cooling issues. BEST is capable of designing, producing and testing power transformers up to 1000MVA, 750KV with its modern plants thanks to 50 years local and international experience. Although they essentially have similar structure, particularly the differences in customer requirements and specifications call for new design for each transformer. Therefore, BEST Electrical and Mechanical design groups handle each transformer separately. BEST produces power transformers that meet every requirement in every power and voltage range above 12,5MVA.

Power Transformers

Main transformers located in transmission and distribution grids. Transformers used in industrial plants, production centers and service supply are also under this group. Power transformers, designed in consideration of international standards and customer specifications, incorporate the widest range in terms of power, voltage and regulation characteristics even though that are similar in principle.

> Production capacity of up to 1000MVA / 750kV,
> The most widely used transformers,


These high-voltage transformers are particularly used for connecting grids at different voltages. If voltage levels are close, autotransformers provide economical advantage. İn autotransformers, measures should be taken particularly against short circuits. Three-phase and single phase autotransformers up to 550kV, 500MVA, produced in BEST plants, have also successfully completed short circuit tests and they have been in operation since their first introduction in the grids.

> Production capacity up to 1250MVA, 750kV, 
> Constant Flux Voltage Variation or Variable Flux Voltage Variation designs

Generator Transformers

Generator transformers amplify generator output voltage to transmission line voltage. They should be designed in consideration of generator characteristics. They can have Neutral and Load step switches. Generator transformers have vital importance in meeting continuous and quality energy need of grids.

> Production capacity up to 1000MVA, 750kV,
> Designs made in consideration of overexcitation and loading curves of generators,

Railroad Transformers

These transformers reduce line voltage to the supply voltage of railroad line. Issues specific to railroad systems, notably high overcurrents, should be taken into consideration. BEST also contributes to this field with transformers that it provided to many railroad transportation systems including Marmaray.

> Production capacity up to 100MVA, 420kV,
> Special Care made to frequently repeated overcurrents,

Mobile Transformers

These transformers are used at mobile switchyards and loaded on transportation vehicles such as truck or railway carriage. As they can be used at multiple points of the grid, compliance with multiple voltage levels required. BEST produces transformers for mobile switchyards in many countries in cooperation with its experienced solution partners.

> Production capacity up to 100MVA 245kV,
> Land and railroad transportation limitations are complied,