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   Regenerative braking in DC systems  evaluated  
Electric stock may recuperate energy during braking by using traction motors as generators. In DC supply systems (1,5 and 3 kV) high recovery rates are only achievable under favourable conditions.
Technology field: Regenerative braking and energy management
close main section General information
  open sub-section Description
close main section General criteria
  open sub-section Status of development: in use
  Time horizon for broad application: now
  Expected technological development: dynamic
  Benefits (other than environmental): big
  Barriers: medium
  Applicability for railway segments: high
    Type of traction:  electric - DC
    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: > 20%
  Share of newly purchased stock: > 50%
  Market potential (railways): high
close main section Environmental criteria
  open sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: 5 - 10%
  Energy efficiency potential throughout fleet: > 5%
  Other environmental impacts: neutral
close main section Economic criteria
  open sub-section Vehicle - fix costs: low
  Vehicle - running costs: significant reduction
  Infrastructure - fix costs: none
  Infrastructure - running costs: unchanged
  Scale effects: none
  Amortisation: < 1 year
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: mid-term
References / Links:  Andersson 2000;  Moninger, Gunselmann 1998;  Piro (no year);  Moninger (no year)
Related projects:  Choppers for Sprinter train sets;  New double-decked Regiorunners;  Studies performed on energy storage systems
Contact persons:
 date created: 2002-10-09
© UIC - International Union of Railways 2003
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