Tertiary winding voltage regulating rectifier transformer of twelve phases

The disclosed transformer is composed of main transformer, two cascaded transformers, and two onload voltage-regulating switches. Characters are that each cascade-connected transformer constitutes six phases. High voltage winding of main transformer, voltage - regulating winding, and high voltage winding of cascade - connected transformer are arranged at inner side near to iron core. Low voltage winding is arranged at outer side. Low voltage winding of main transformer is connected to low voltage windings of cascaded transformers in series so as to form winding structure in twelve phases and shape of dual Arabic eight. Advantages are: (1) integrating main transformer with regulating function so as to reduce floor area, and raise operating efficiency; (2) reducing influence on power network from harmonic wave, and reducing operating cost; (3) raising safe reliability of operation.