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Railways through Europe |
maps and interoperabilty |
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| Content is mostly outdated and page is not updated anymore. |
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description of AC networks
advantages of 15kV 16 2/3Hz and 25kV 50Hz
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- The use of a relatively high voltage allows high power to be
delivered through a light catenary over several tens of kilometres from the
feeder point with little loss, and little risk of interference to signalling and
railside telecoms.
- 25kV 50Hz:
the need for a separate high-voltage distribution network (or
frequency converter stations) is avoided and smaller transformers to be used on
motive power are possible.
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disadvantages of 15kV 16 2/3Hz and 25kV 50Hz
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- In order to obtain the advantages mentioned above, AC electrification must be at a
relatively high voltage and it may be necessary to
provided increased clearance to ensure adequate insulation, eg by lowering the
track in old tunnels.
- Whereas only a transformer is needed on the motive power to convert 15kV 16
2/3Hz down to a voltage suitable for specially-designed traction motors, 25kV
50Hz must also be converted to DC, or variable-frequency AC, before input to the
traction motors.
- 25kV 50Hz:
Compared with the 15kV 16 2/3Hz system
care must be taken to avoid unbalanced single-phase
loads on the three-phase public network.
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- 15kV 16 2/3Hz:
Germany, Switzerland, Austria, Norway, Sweden
- 25kV 50Hz:
Great Britain, France, Belgium, Portugal,
Finland, Denmark, Czech, Slovakia, Hungary, Romania, Bulgaria, Greece and former Yugoslavia
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page last updated: 26. March 2018 |
©1998-2013 Thorsten Büker |
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