TWELVE-PHASE STEPDOWN AUTOTRANSFORMER CONVERTER OF PHASE NUMBER Russian patent published in 2014 - IPC H02M5/14 

FIELD: electricity.

SUBSTANCE: invention relates to converting equipment and may be used to create variable AC and DC electric drives and comprises a stepdown autotransformer, having three coils (1, 2 and 3) of the primary winding and six coils (4, 5, 6, 7, 8, 9) of the secondary windings connected to each other by assemblies A, B, C, D, E, F, having each two taps (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21) from turns. Each coil (4, 5, 6, 7, 8, 9) of the secondary winding is the side of the hexagon, converting a symmetrical three-phase system of voltages into a symmetrical six-phase one. Taps (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21) from turns of coils (4, 5, 6, 7, 8, 9) of the secondary winding represent outlets of voltages of the twelve-phase system of voltages.

EFFECT: reduced consumption of active materials during replacement of a three-phase transformer with a three-phase autotransformer due to reduction of number of turns of the primary winding, besides, reduction of losses.

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