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Traction Current Converter PlantAs Traction current converter plant one calls a plant for the conversion of electric power from public electricity mains in current for the supply of railways with traction current. For the supply of railways running with AC of decreased frequency, like in Germany, Austria and Switzerland, Norway and Sweden usually combinations consisting of a three-phase alternating current synchronous motor and a generator for single phase AC, which are coupled over a transmission, used. Besides also HVDC-back-to-back stations are used. Traction current converter plants are either decentralized (direct supply of the overhead line of the traction current converter plant, no feed into the traction current network) as well as central (for the supply of the traction power network, usually in addition, for the supply of the overhead line). One finds central Traction current converter plant works in Germany (among other things in Neckarwestheim, Ulm, Nuernberg), Austria and Switzerland, while decentralized Traction current converter plants for the traction current supply are used in Norway, Sweden, Mecklenburg-Vorpommern and Brandenburg. For the supply of railways running by DC since the 1920 years substations with electric rectifiers are used. Traction current converter plant using motor-generator combinations are replaced increasingly by static inverters.
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