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Traction transformers for high-speed trains

The high-speed rail sector is undergoing huge and rapid growth. Hitachi Energy draws on considerable experience in designing and manufacturing transformers for high-speed trains.

Hitachi Energy is supplying traction transformers for the high-speed trains manufactured by Alstom, AnsaldoBreda, Bombardier, CAF, Ministry of Railways China, Siemens Mobility, and Talgo.

The total weight of the transformers is a factor of crucial importance in very high-speed trains where every kilo counts. By incorporating a number of design innovations like multi-purpose components such as winding and lightweight materials, Hitachi Energy has reduced the total weight of the transformers. For instance, Hitachi Energy winding enables the train to use both DC and AC systems without adding extra weight.

Product scope:


  • Power: 2,500 - 6,000 kVA
  • Network: 25 kV/50 Hz; 15 kV/16 2/3 Hz; 1.5 kV/DC (equipped but not used); 3 kV/DC (equipped but not used); 25 kV/60 Hz
  • Insulating fluid: ester


  • Weight: 4 - 8 tons
  • Size (L x I x H): 3.5 x 2.5 x 0.6 m and 4 x 2.7 x 0.8 m
  • Assembly on vehicle: underframe
  • Tank material: mainly aluminum, steel, low, and high-temperature steel

Accessories: cooling system, pumps and oil flow indicator, oil level detector, overpressure valve, PT100 for thermal control, thermostat, filling and draining valves, Buchholz relay, current measurement

Traction Transformers for high-speed trains

Traction transformers

Hitachi Energy supplies traction transformers for all applications: high-speed, commuter and regional trains, locomotives, tram-trains and AC metros offering different designs offering different designs in terms of size, weight and power ratings.

Transformers for railway

The electric energy for railways is supplied as high voltage to the catenary feeder substations, where the voltage is reduced to a suitable level and fed to the railway catenary conductors to be used by locomotives and trains.


Hitachi Energy offers distribution and power transformers, dry-type and liquid-filled transformers as well as services, to be used in utility, industrial and commercial applications.

Traction transformers repairs and services

Traction transformers are critical components in the traction chain, affecting both train performance and operator services.

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