Fenno–Skan

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Fenno -Skan is a HVDC link between Dannebo at Forsmark in Sweden and Rauma in Finland, which was inaugurated in 1989. The 233 km long pipeline consists of a 200 -kilometer, manufactured by ABB Submarine, that was the longest Hochspannungsseekabel the world at the time of commissioning of the plant. On the Finnish side and a 33 -kilometer transmission line section exists. The overhead line masts of the Fenno -Skan carry two conductors. On the Erdseiltraverse the electrode line, which has a total length of 38 kilometers and is laid on the last five kilometers on a separate line on wooden poles running.

The Fenno -Skan is a monopolar HVDC with return line on the ground with 400 kV operating voltage and 500 MW of transmission capacity. A bipolar expansion is planned.

A special feature of the Fenno -Skan is that in contrast to other HVDC systems in Europe, the current systems are operated synchronously on both sides and are also on AC lines linked. However, these lines since they run about Lapland, very long, so that higher transmission losses.

The cable is one of the two transmission system operators Fingrid from Finland and the Swedish Svenska Kraftnät. An extension Fenno -Skan 2 is to be completed by the end of 2011.

While she is out in Finland on the masts of the existing transmission line, a new transmission line from the coast to the under construction HVDC station Finnbole is built for them in Sweden. This line crosses west of Mehedeby ▼ 60.47944444444417.236666666667 the traction current Tierp - Gävle and her parallel 220 kV three-phase power line Mehedeby - Gävle. This is the only crossing of a HVDC transmission line and a traction power line at all and the only place in the world where all three basic types of high-voltage lines ( three-phase line, Einphasenwechselstromleitung and DC line ) meet each other.