Full resolution (JPEG) - On this page / på denna sida - Second part - X. Manufacturing Industries. By Å. G. Ekstrand, Ph. D., Chief Engineer, Control Office of the Department of Finance - 11. Other Industries - The Electric Industry, by A. Enström, Ph. D., C. E., Stockholm
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OTHER INDUSTRIES.
889
found in the Capital. In 1890/91 a steam central was built, calculated for 2,000
horse-power. Previously there were already in existence some small works and
one large private one. The central furnishes the current on a three-wire system
with a tension of 2x110 voit. The machines are assisted by large
accumulator-batteries. As, however, the consumption has rapidly increased, these works have
become insufficient, and during 1903 a new larger steam central has been built
outside the town at the Värta harbour, and is planned for 16,000 horse-power,
which by a treephased alternating current of 6,000 voit tension furnishes the
electricity to four sub-stations within the town. From these a continuous current of
2 x 220 voit tension by means of asynchronous motor generators, in connection with
storage batteries is distributed. The new central is for the present furnished with
two machines of 2,200 horse-power each. It is planned in view of a future
transmission of power from the river Dalelfven (a distance of 115 miles), upon which
it is intended to remain as reserve. The older central in Stockholm is typical for
the greater part of town electricity works as regards construction: steam-power,
continuous current of 2x110 (or 2x220) voit, and accumulators. The centrals
in Sundsvall (1891), Hernösand, Eskilstuna, Malmö, Helsingborg, Trelleborg,
Oskarshamn, Karlshamn, etc., work on the same system. The motors generally
are piston-rod engines, occasionally steam-turbines (de Laval system), as in
Hernösand, Kristinehamn, etc. Several towns are lighted by power derived from
waterfalls, as Örebro, Falun, Söderhamn, Gefle, Umeå, and in many cases the old steam
centrals are enlarged and supplemented by transmission of water-power, e. g.
Sundsvall, Oskarshamn, etc. The electric light is in several places generated by
means of alternating current: Umeå, Hudiksvall, Motala (1890), Eksjö. In a few
instances, so-called Diesel motors have been brought in use for running the
generators, as in Östersund, Norrköping, Ronneby. These machines, the construction
of which has been brought to a high degree of perfection by the Swedish Diesel
Chlorate Factory, Månsbo.
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