HVDC Gotland

The HVDC Gotland was a high-voltage direct current (HVDC ) between Västervik in Sweden and Ygne on Gotland. The first HVDC Gotland went into operation in 1954 and was at an operating voltage of 100 kV, a power of 20 MW through a 98 km long submarine cables transferred. She was the first commercial plant for high voltage direct current transmission in the Western world and mercury vapor rectifier used as a converter.

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1970, the transmission power was increased to 30 MW, and the transfer voltage to 150 kV, in the power converter to an existing thyristorbestückter converter is connected in series with mercury vapor rectifier. This was the first use of thyristors in a plant for high voltage direct current transmission at all.

However, the transmission capacity of this plant was not enough and so in 1983 an entirely new connection, the HVDC Gotland 2 was built. You can transfer a maximum of 130 MW at a transmission voltage of 150 kV and is fully equipped with thyristors. It uses a 92.9 km long submarine cable, and unlike the first HVDC system also a overhead line section of 6.6 km in length, which leads from the converter station to Västervik Swedish coast. When masts are wooden poles used.

1987 this system was replaced by a more HVDC link, Gotland 3. It consists of a 98 km long natural gas and Seekabelstrecke without overhead line sections and has a maximum transmission capacity of 130 MW at an operating voltage of 150 kV. This system made ​​the initial investment in 1954 and 1970, installed advanced redundant and so it was shut down and dismantled after their commissioning.