HVDC Gotland

The HVDC Gotland, on the Swedish east coast, was the first fully commercial static plant for high voltage direct current transmission in the world. The first HVDC Gotland link (Gotland 1) went into service in 1954. It could transfer 20 megawatts over a 98-kilometer-long submarine cable between Västervik on the mainland and Ygne on the island of Gotland, with a voltage of 100 kV. As a static inverter, Mercury arc valves were used.

In 1970 the service was re-engineered to transmission capacity of 30 megawatts at a voltage of 150 kV by using the first thyristor module for HVDC applications.

However even this capacity was not high enough and in 1983 a new monopolar link, HVDC Gotland 2 with a transmission capacity of 130 MW and a transmission voltage of 150 kV was established. It consists of a 92.9 kilometers long cable with a single copper conductor of 800 mm² cross section, from which 92 kilometres are submarine and 0.9 kilometres underground. Beside this, HVDC Gotland 2 has a 6.6 kilometres long overhead powerline section between Västervik static inverter plant and the Swedish Coast. It has 2 Aluminium conductors each with a cross section of 910 mm², which are installed on wooden poles - perhaps the only HVDC powerline using such poles. In 1987 HVDC Gotland 3, a further monopolar link, with a transmission capacity of 130 MW and transmission voltage of 150 kV was installed. It consists of a 98 kilometers long cable with a single copper conductor of 800 mm² cross section. 92 kilometres of this cable are laid in the sea and 6 kilometres underground on land.

The grounding electrode of the Västervik Inverter Station is situated at Almvik on Östra Eknö, that of Ygne Inverter Station at Gravfält. Both electrodes are used for Gotland 2 and Gotland 3 and are situated in sea-water filled basins close to the sea. At Almvik there are 2 such basins, while Gravfällt uses only one. The basin design of the electrodes prevents fishes from getting too close to the electrodes, which may harm them. Almvik electrode is connected with Västervik Inverter Station by an 18.95 kilometres long line with 4 overhead line and 3 submarine cable sections for strait crossings. The overhead line sections, which have a total length of 17 kilometres are installed on wooden poles and consist of 2 Aluminium conductors each with 910 mm² cross section. The total length of the cable sections amounts to 1.95 kilometres and consist of 2 cables each with 1000 mm² cross section. The connection between Ygne Inverter Station and Gravfält Electrode has a length of 12.75 kilometres. It consists of a 12 kilometres long overhead line on wooden poles, which uses 2 Aluminium conductors each with 910 mm² cross section and a 0.75 kilometres long underground cable consisting of 2 Aluminium conductors each with 1000 mm² cross section.

Sites

Site	Coordinates
Västervik HVDC Static Inverter	57°43′41″N 16°38′51″E / 57.72806°N 16.64750°E / 57.72806; 16.64750 (Västervik HVDC Static Inverter)
Händelöp HVDC Gotland 2 Cable Terminal	57°41′07″N 16°42′47″E / 57.68528°N 16.71306°E / 57.68528; 16.71306
Lilla Nävelsvik Electrode Line Terminal	57°40′57″N 16°38′22″E / 57.68250°N 16.63944°E / 57.68250; 16.63944
Narsvik Overhead Electrode Line Terminal	57°40′41″N 16°38′19″E / 57.67806°N 16.63861°E / 57.67806; 16.63861
Grönvall Overhead Electrode Line Terminal	57°38′54″N 16°37′25″E / 57.64833°N 16.62361°E / 57.64833; 16.62361
Grytsholmen Overhead Electrode Line Terminal	57°38′42″N 16°37′21″E / 57.64500°N 16.62250°E / 57.64500; 16.62250
Hamudden Overhead Electrode Line Terminal	57°36′29″N 16°39′33″E / 57.60806°N 16.65917°E / 57.60806; 16.65917
Västerbofjärden Overhead Electrode Line Terminal	57°36′10″N 16°40′25″E / 57.60278°N 16.67361°E / 57.60278; 16.67361
Almvik Electrodes	57°34′32″N 16°41′49″E / 57.57556°N 16.69694°E / 57.57556; 16.69694 (Almvik Electrode) ; 57°34′29″N 16°41′50″E / 57.57472°N 16.69722°E / 57.57472; 16.69722 (Almvik Electrode)
Ygne HVDC Static Inverter	57°35′13″N 18°11′44″E / 57.58694°N 18.19556°E / 57.58694; 18.19556 (Ygne HVDC Static Inverter)
Gravfält Electrode	57°30′52″N 18°6′35″E / 57.51444°N 18.10972°E / 57.51444; 18.10972 (Gravfält Electrode)

Waypoints

Overhead line on the Swedish Mainland

Electrode line on the Swedish Mainland

Electrode line on Gotland

References

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