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List of installations for 15 kV AC railway electrification in Sweden
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Electric railways in Sweden are powered from a single-phase AC supply of 15 kV at 16+2⁄3 Hz, as used in Germany, Austria and Switzerland. Unlike these countries, the 132 kV traction current grid covers only part of the country, approximately at the north of Stockholm. The grid is fed by frequency converters and has no generation nor transmission lines from Norway, which uses the same traction current system. Formerly, the Porjus Hydroelectric Power Station provided electric power to the traction network. In the future, the Älvkarleby Hydroelectric Power Station may be connected to the traction network, as this would increase stability of the power grid of the railway system. Separate from the 132 kV grid is a 30 kV line connection between the Mon and Varp substations at the north of Gothenburg.
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The overhead wire system has some differences. It is common that the pylons for the overhead wire carry a three phase AC system. In order to reduce the number of substations, the voltage at the substations for the overhead wire is 32 kV at some lines (AT-System). However, trains require 16 kV, so autotransformers are used, which have a central connection connected with the grounded railway, while the other connections are connected to the 32 kV output. The voltage between the central connection to the phase is 16 kV. The other pole to ground is also 16 kV, but with opposite polarity and runs along the track on the overhead wires until the separation section. Other lines are fed directly with 16 kV from the substations. However, differential transformers are used for feeding, in order to eliminate jamming signals.
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Decentralized Converter Stations
Converter Stations only feeding power into the overhead wire.
Centralized Converter Stations
Converter Stations, which also feed power into the 132 kV single phase AC grid.
Substations
Substations fed from the 132 kV single phase AC grid.
30 kV-line Mon-Varp
Endpoints of the 30 kV-interconnection Mon-Varp.
Other remarkable points
The crossing-point between the traction current power line and HVDC Fenno-Skan 2 is the only crossing point of the HVDC overhead line and single-phase AC overhead powerline in the world. It is located at coordinates 60°28′45.2″N 17°14′11″E..
The railway on the Öresund bridge is fed with Danish standard voltage, 25 kV 50 Hz AC, which goes along 6 km within Swedish borders. The power is supplied from Denmark. The system limit is at Lernacken, near the bridge abutment.
Two local railways in Stockholm County, Roslagsbanan and Saltsjöbanan, as well as Stockholm Metro and all tramways, run on DC power.
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