HVDC Volgograd–Donbass
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The HVDC Wolgograd-Donnbass is a high voltage direct current line between the hydro-electric power plant Wolgograd and Donnbass, which went into service in 1964. It consists of a 475 kilometre long overhead line. The static inverters of the HVDC Wolgograd-Donnbass are equipped with mercury arc rectifiers for a voltage of 100 kV and a maximum current of 940 ampere, which were partly replaced at the beginning of the 90's by thyristors. The HVDC Wolgograd-Donnbass is a bipolar HVDC with an operating voltage of 400 kV. It can transfer a maximum power of 750 megawatts.