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WindSTAR transformers

Hitachi Energy's WindSTAR, liquid-filled transformers are ideal solution for fixed and floating offshore wind applications. Their reliable, energy-efficient and compact construction is well suited for installation in wind turbine towers or nacelles.

As turbine size increases for offshore (8 MW and above), turbine transformers must remain compact and lightweight with a minimal footprint, while also meeting specific application needs, mechanical structural constraints and costs.

Based on 36 kV class established solution for large offshore turbine, Hitachi Energy has developed a transformer able to step up voltage at world record of 66 kV and meet the most stringent electrical and mechanical requirements. With its WindSTAR transformer, Hitachi Energy is bringing step change in the scale of power and voltage.

Product scope

  • Available for 36 and 72.5 kV class
  • Available for power rating superior to 7 MVA
  • Available for 50 Hz and 60 Hz
  • Available for IEC and ANSI markets


  • Vibration and short-circuit proof 
  • Modular design for any customer request
  • Made for durability in salt mist environments
  • Environmentally friendly and fire safe ester insulation liquid
  • High-temperature insulation material

Why Hitachi Energy?

  • World’s leading manufacturer of 66 kV wind turbine transformers for the world’s most powerful offshore wind turbines
  • Best-in class solution to withstand sudden variable loading and typical extreme environmental events of offshore conditions
  • Hitachi Energy turbine transformers are specially designed to meet the specific application needs
  • Hitachi Energy proven TrafoStar Design used for offshore wind turbines reaching 10 MW and above
  • Estimated installed base of more than 1,000 units worldwide
  • Key actor in international technical standard publication and in the forefront in developing new requirements for transformers
  • Specialized service team for offshore interventions
power plant engineer for substation

Contact us

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