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   Medium-frequency transformer  evaluated  
The main transformer contributes considerably to losses in traction system (especially in 16,7 Hz systems). Modern power electronics allow for a more efficient and much lighter alternative: the medium frequency transformer operating at 400 - 800 Hz or comparable frequencies.
Technology field: Optimisation of traction technologies
close main section General information
  open sub-section Description
close main section General criteria
  open sub-section Status of development: test series
  Time horizon for broad application: in > 10 years
  Expected technological development: highly dynamic
  Benefits (other than environmental): big
  Barriers: medium
  Applicability for railway segments: high
    Type of traction:  electric - AC
    Type of transportation:  passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: 0 %
  Share of newly purchased stock: 0 %
  Market potential (railways): highly uncertain
close main section Environmental criteria
  open sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: 2 - 5%
  Energy efficiency potential throughout fleet: 1 - 2%
  Other environmental impacts: neutral
open main section Economic criteria
no data available Application outside railway sector (this technology is railway specific)
close main section Overall rating
  open sub-section Overall potential: very promising
  Time horizon: long-term
References / Links:  Kunz et al. 1999
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Contact persons:
 date created: 2002-10-09
 
© UIC - International Union of Railways 2003