FIELD: electricity.
SUBSTANCE: invention relates to a power supply device for a speed-variable drive located on a sea bottom, which at the side of the grid and at the side of the load comprises appropriate rectifiers (10, 12) of alternating current, which at the side of direct current by means of a direct current cable (44) are electrically connected to each other, besides, the AC rectifier (10) of the grid side on the surface is connected with a supply power grid (8). In accordance with the invention, on the grid side there is an uncontrolled AC rectifier (10) provided, and at the load side there is an AC rectifier (42) with distributed energy accumulators, each phase module (52) of the AC rectifier (42) with the distributed energy accumulators comprises the upper and the lower branch (T1, T3 T5; T2, T4, T6) of valves, containing at least two serially connected dipole subsystems (54), the AC rectifier (42) with distributed energy accumulators is installed on the sea bottom in close proximity from the speed-variable drive, and signalling electronics (16) of the AC rectifier (42) with distributed energy accumulators is installed on the surface.
EFFECT: power supply device is provided for underwater applications, besides, distance between energy input on the surface and a drive on the sea bottom make amount to several hundreds of kilometres with sea depths of several kilometres.
