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   Ventilation control (retrofit)  evaluated  
Traction equipment is cooled by ventilation to prevent over-heating. The energy needed for ventilation can be substantially reduced by demand-controlled operation, i.e. by controlling ventilation power according to actual cooling demand of the motor (or other traction equipment). The technology can be integrated in old stock as a refitting measure in some cases.
Technology field: Optimisation of traction technologies
close main section General information
  close sub-section Description
    Conversion losses of traction equipment of an electric traction unit show up as heat that must be removed from the system continuously to prevent over-heating. This is done by the coolers that in many locomotives are realised as mechanical ventilators. Whereas most modern stock allows for a continuous demand control of motor ventilation, in many old (and some modern) traction units ventilation is not demand-operated, or demand operation is not efficient. As a consequence, in many load situations ventilation runs at higher power than needed for cooling. These locomotives offer potential for corresponding retrofit measures. Conventional single-phase a.c. locomotives equipped with a two-speed ventilation system (ventilation offers only two operation modi: low and high) may be retrofitted with an optimised control of the utilisation of the two speeds. The device is based on a simple computer calculating a hypothetical excess temperature in the traction motors on the basis of recorded currents and a measurement device for the oil temperature in the transformer. Integration of a sensor measuring the real motor temperature is too complicated and risky. Threshold values automatically select one of the two ventilation speeds. As a result, full ventilation is used much less, leading to substantial energy savings. Corresponding retrofit measures have been realised at SBB and ÖBB. A similar measure could be realised on brake ventilation.
open main section General criteria
open main section Environmental criteria
open main section Economic criteria
no data available Application outside railway sector (this technology is railway specific)
open main section Overall rating
References / Links:  Bänziger et al. 1995;  Mouginstein, Pokrovskij 2000;  Slattenschek 1997;  Slattenschek 2000
Attachments:
Related projects:  Optimised Ventilation Control Re 4/4 II, Re 4/4 III
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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