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Traction transformers for double-decker electrical multiple units (DDEMU)

Rapid urbanization, with its traffic jams, polluted air, and swelling populations, means rail operators and infrastructure managers must accommodate more passengers in rail networks that are already congested. One solution is to increase passenger capacity on existing networks

Hitachi Energy traction transformers can help rail operators increase passenger capacity on existing rail networks by using double-deck trains with the best seat-per-train ratio available.

The wear and tear on regional and commuter trains is different from long-distance, high-speed trains. Higher, heavier double-deck EMUs accelerate fast and frequently stop along local and middle-distance routes that connect cities and towns, which puts severe strains on their traction transformers.

The product image shows the Stadler DOSTO (from German Doppelstock, "double-decker"), a bi-level electric multiple-unit commuter train developed by Stadler Rail of Switzerland. It is equipped with Hitachi Energy traction transformers.


Product scope

  • Electrical
    • Power: 1,500 - 2,500 kVA
    • Network: 25 kV/50 Hz; 15 kV/16 2/3 Hz; 1.5 kV DC
    • Insulating fluid: mineral or ester
  • Mechanical
    • Weight: 2,500 - 3,500 kg
    • Size (L x I x H): 2.2 x 2.7 x 0.8 (roof) - 1.2 x 0.7 x 2 (under frame)
    • Assembly on the vehicle: roof mounted or machine room
    • Tank material: mineral or ester
  • Accessories (according to customers' needs)
    • Cooling system, pumps, and oil flow indicator
    • Oil level detector
    • Overpressure valve
    • PT100 for thermal control
    • Thermostat, filling and draining valves
    • Relay Buchholz
    • Current measurement

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