BEST Transformer A.S.

  • Booth: 3841

BEST Transformer A.S. was founded in 1966. The company's line of business includes manufacturing power, distribution, special, dry type transformers and reactors. BEST is the Turkey's leading transformer manufacturer in the sector with its own IP, technical capabilities,  170000 m2 of production area and 50000 MVA of production capacity. We export more than 50% of our production to more than 85 countries today. Being the first to install R&D department in the sector, also allocating 2.2% of our annual turnover to this area, BEST's greatest goal is to further develop the industry. 

Brands: Transformers (BEST, Bestfriend, Duraformer, Silentformer, Best Wind) and Reactors


    BEST is capable of manufacturing power transformers up to 1250MVA 765kV, special transformers up to 360 MVA 36 kV....

  • POWER TRANSFORMERS: 16MVA 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, manufacturing and testing power transformers up to 1250MVA, 765kV with its modern plants thanks to 56 years domestic 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 manufactures power transformers that meet every requirement in every power and voltage range above 16MVA. There are 4 types of power transformers.

    Auto Transformers:These high-voltage transformers are particularly used for connecting grids at different voltages.If voltage levels are close, autotransformers provide economical advantage. In autotransformers, measures should be taken particularly against short circuits. Three-phase and single phase autotransformers up to 550kV, 500MVA, manufactured in the 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, 765kV.Constant Flux Voltage Variation or Variable Flux Voltage Variation designs.

    Step Up/Down 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 1250MVA, 765kV.Designs made in consideration of overexcitation and loading curves of generators.

    Railway Transformers:These transformers reduce line voltage to the supply voltage of railway line.Issues specific to railway systems, notably high overcurrents, should be taken into consideration. BEST also contributes to this field with transformers that it provided to many railway 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 railroad carriage.As they can be used at multiple points of the grid, compliance with multiple voltage levels required. BEST manufactures 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.

    SPECIAL TRANSFORMERS:Special transformers are used in special applications in the industry and in the grid. They are produced in small numbers and they generally have to deal with overcurrents, overvoltages and reactive loads under severe conditions. This requires each of the following transformers to be particularly addressed. A longer design and production process is required for special transformers than standard type power transformers. Special transformers are regarded as the peak of transformer industry due to know-how, diligence and accuracy required by both design and production technology.There are 5 categories under special transformers.

    Furnace Transformers:Furnace transformers are used in iron and steel plants for melting metal. The metal in melting pots are melted with very high currents.Additional measures should be taken in furnace transformers against these high currents, possible short circuits and overcurrents.Production capacity is up to 360MVA,36kV.Must endure against short circuits and overcurrents.

    Furnace Reactors:They are used to improve operating regime of furnace transformers in iron and steel plants.Measures should also be taken on furnace reactors against all kinds of overcurrent and voltage caused by furnace operation.Production capacity is up to 250 MVAr,36kV.Increases reactance of the system and also enables reactance regulation.Must endure against short circuits and overcurrents.Can be in the same tank if required.

    Shunt Reactors:These special transformers are used for compensating capacitive load formed in power transmission lines at times of low load.Therefore, they are rated according to their reactive powers. They increase energy quality and efficiency of the grid by preventing over voltages besides their duty of compensation.Production capacity is up to 350MVAr,550kV.Acts as inductive load on high voltage transmission lines.

    Current Rectifier Transformers:These transformers are used for feeding systems with direct current requirements. Their main areas of use are purposes of electrolysis in metallurgy plants and railway lines.There are different approaches in the design of current rectifier transformers according to high output voltage or high output current requirements. They are produced with different structures according to number of pulses.Production capacity is up to 60MVA, 36kV.Can be with Bridge Assembly or Star Point Reactor.It is produced in 6, 12 and 24 pulses.

    Phase Shifter Transformers:They are used to determine energy flow direction at connection points of high voltage grids. They are used to obtain different phase angles than inputs by using special coil structures at outputs.Power and voltage of these transformers are limited to the capacity of the initial switch. Furthermore, customer and grid requirements should be understood well due to their role in the grid.Production capacity is up to 600MVA 550kV.Available application types; Single Active, Multiple Active, Booster, Autotransformer.

    BEST is capable of manufacturing dry type transformers below 40MVA and 72,5kV, distribution transformers below 16MVA and 72,5kV....

  • DRY TYPE TRANSFORMERS: 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 40MVA and 72,5kV class due to it’s dedicated manufacturing facility and engineering capabilities. There are 4 categories under dry type transformers.

    Distribution Transformers:These are transformers that can be used in distribution systems.It is used as step-down transformer in industrial facilities and collective settlement centers.It can be used as step-up transformer in power plants.It can be designed as Load or Idle Switch.Transformers can be mounted inside cabinets with IP55 protection degree.Production capacity is up to 40 MVA and 72.5 kV.

    Earthing Transformers: It provides fault current measurement by creating a neutral point in insulated systems and is used to protect the system.Transformers can be mounted inside cabinets with IP55 protection degree.Production capacity is up to 72.5 kV regardless of power.

    Rectifier Transformers:They are transformers used to provide rectifier units in different industrial areas.They are used for traction applications in metro and tram lines, marine propulsion systems, warning functions in power plants and industrial motor-converter systems.It is produced in 6, 12 and 24 pulses.Transformers can be mounted inside cabinets with IP55 protection degree.Production capacity is up to 20 MVA 72.5 kV.

    Shunt Reactors:These special transformers are used for compensating capacitive load formed in power transmission lines at times of low load. Therefore, they are rated according to their reactive powers.They increase energy quality and efficiency of the grid by preventing over voltages besides their duty of compensation.Production capacity is up to 10MVAr, 72,5kV.Acts as inductive load on high voltage transmission lines.

    DISTRIBUTION TRANSFORMERS:Distribution transformers are used in urban distribution systems, buildings and industrial plants. BEST manufactures distribution transformers for all kinds of needs with its experience dating 1966, as well as its modern design and production plants. Design of all kinds of oil-immersed distribution transformers below 16MVA and 72,5kV are made by BEST design team according to the principles of maximum efficiency, compactness and endurance in compliance with customer demands. There are 3 categories in distribution transformers.

    Distribution Transformers:They are transformers used in distribution and transmission lines.Distribution lines feed residential, industrial facilities, commercial and public spaces.Distribution transformers used for transmission lines are also mainly used in renewable energy projects.It can be produced hermetically, with hermetic, expansion tank and gas cushion.It can be designed as idle and load tap switches.Production capacity is up to 16 MVA and 72.5 kV.

    Rectifier Transformers:It is used to provide constant and continuous tension in small and large scale production companies, hoists and rolling mills using production lines.These transformers isolate the system from the network and prevent reactive power generation.It is produced in 6, 12 and 24 pulses.Production capacity is up to 20 MVA 16 kV. kV.

    Earthing Transformers:Earthing transformers are used for creating a neural point that can be connected to the ground for systems fed with delta connected coil.They are not only used for grounding, but also can be used to provide output for the service needs.Production capacity is up to 72,5kV.In ZN, ZNyn and YN(d) connection groups.Designs made with different currents and periods according to customer requirements.