A 2000 A 250 kV thyristor valve at the Manitoba Hydro Henday converter station, April 2001 The Nelson River Bipole is a system of two HVDC lines in Northern Manitoba. They transfer the electric power generated in the hydroelectric power stations of Northern Manitoba from the rectifier stations near Gillam and Sundance south to the inverter station near Winnipeg. Each bipolar line has has two parallel overhead conductors.
Bipole 1 runs from Gillam (Radisson Converter Station) to Rosser (Dorsey Converter Station). It has a length of 895 kilometres and can transfer at a voltage of 450kV a maximum power of 1620 megawatts. Originally only mercury arc valves were used, placed in service between March 1971 and October 1977 (the line operated at the beginning with lower voltage and had a lower maximum power rating). In the 1990s at one pole the mercury arc valves were replaced by thyristors.
Six thyristors in a module, with cooling piping and protective capacitors. Bipole 2 runs from Sundance (Henday converter station) to Rosser (Dorsey converter station). It is equipped like all modern HVDC plants with thyristors in the static inverters. The length of the line of Bipol 2 is 937 kilometers. The Bipol 2 can transfer a maximum power of 1800 megawatts at a bipolar power of 500kV. The Nelson River Bipol 2 was put into service in two stages. In the first stage in 1978 the maximum transmission rate was 900 megawatts at a voltage of 250kV. Since 1985 the Bipol 2 can transfer the maximum power of 1800 megawatts.
Source: http://de.wikipedia.org/wiki/Nelson_River_Bipol
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