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Ventilation control (retrofit) |
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| 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.
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Technology field: Optimisation of traction technologies
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General information
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Description
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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. |
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General criteria
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Environmental criteria
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Economic criteria
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Application outside railway sector (this technology is railway specific)
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Overall rating
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 date created: 2002-10-09 |
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| © UIC - International Union of Railways 2003 |
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