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Loss reduction by optimised power intake |
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| Some electric vehicles are equipped with a control tool regulating the power intake according to distance from substation. The system aims at avoiding negative effects on power electronics through high currents. As a side effect catenary losses are reduced.
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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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Power losses in catenary are proportional to I2, the square of catenary current. From an energy efficiency perspective, it is therefore desirable to have low currents. On the other hand, traction power is P = U ? I, meaning that the current needed depends on the voltage. Since catenary voltage U drops with distance from substation, the current I would accordingly increase, leading to higher losses. This may be avoided by reducing power intake of traction unit according to distance from substation.
Such a system is realised on most new electric vehicles. An on-board sensor measures catenary voltage and regulates the maximum power intake in order to avoid high currents. As a consequence, acceleration performance on part of the network is slightly reduced and therefore running time is slightly increased.
Most new electric stock are equipped with such a control tool. A retrofit of old vehicles is not feasible. |
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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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References / Links:
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Attachments:
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Related projects:
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Contact persons:
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 date created: 2002-10-09 |
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| © UIC - International Union of Railways 2003 |
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