NINE-PHASE CONVERTER Russian patent published in 2013 - IPC H02M5/14 

FIELD: electrical engineering.

SUBSTANCE: device consists of three-phase transformer having three coils of the primary winding: primary coil (1), primary coil (2) and primary coil (3) which are star-connected (or delta-connected to the three-phase network, six interconnected coils (4, 5, 6, 7, 8, 9) of the main secondary windings having taps from turns (10, 11, 12, 13, 14, 15) and three coils of auxiliary secondary winding (16, 17, 18). At that coil (4) beginning of the secondary winding is connected to coil (8) beginning of the secondary winding, coil (8) end is connected to coil (6) end of the secondary winding, coil (6) beginning of the secondary winding is connected to coil (5) beginning of the secondary winding, coil (5) end is connected to coil (9) end of the secondary winding, coil (9 beginning of the secondary winding is connected to coil (7) beginning of the secondary winding, coil (7) end is connected to coil (4) end of the secondary winding closing the circuit of the secondary coils. Each coil of the main secondary windings of the transformer is a hexagon side. Each coil of auxiliary secondary windings is connected by its beginning to one hexagon corner to which main secondary windings of the same leg with auxiliary winding.

EFFECT: reduction of active materials consumption at replacement of three-phase group transformer by three-leg transformer.

2 dwg