The HVDC Gotland, on the Swedish east coast, was the first fully commercial static plant for high voltage direct current transmission in the world. "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. HVDC or high-voltage Direct current Electric power transmission systems contrast with the more common Alternating current systems as a means The first HVDC Gotland link (Gotland 1) went into service in 1954. Year 1954 ( MCMLIV) was a Common year starting on Friday (link will display full 1954 Gregorian calendar) 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 100kV. Västervik Municipality ( Västerviks kommun) is a municipality in Kalmar County, south-eastern Sweden, with its seat in the city is a county, province and municipality of Sweden and the largest Island in the Baltic Sea. As a static inverter, Mercury arc valves were used. An inverter is an electrical or electro-mechanical device that converts Direct current (DC to Alternating current (AC the resulting AC can be at any required voltage A mercury arc valve ( mercury vapor rectifier) is a type of electrical Rectifier which converts alternating current into Direct current.
In 1970 the service was re-engineered to transmission capacity of 30 megawatts at a voltage of 150kV by using the first thyristor module for HVDC applications. Year 1970 ( MCMLXX) was a Common year starting on Thursday (link shows full calendar of the Gregorian calendar. The thyristor is a solid-state Semiconductor device with four layers of alternating N and P-type material
However even this capacity was not high enough and in 1983 a new link, HVDC Gotland 2 (transmission capacity: 130MW, transmission voltage: 150kV, cable length 92. Year 1983 ( MCMLXXXIII) was a Common year starting on Saturday (link displays the 1983 Gregorian calendar) 9 kilometers, 6. 6 kilometre overhead line) and in 1987 HVDC Gotland 3 (transmission capacity: 130MW, transmission voltage: 150kV, cable length of 98 kilometers) were built. The latter made the HVDC Gotland 1 redundant and led to its deactivation and disassembly.