Patent ID: 9742308
Date: 2017-08-22
CPC Classifications: H01F,H02M

Claim:
1. An apparatus comprising: a first polygon connected transformer having at least six windings defining successive tappings there between which constitute secondary tappings of the first transformer; a second polygon connected transformer having at least six windings defining successive tappings there between which constitute secondary tappings of the second transformer; a three-phase primary power supply being supplied to the tappings which constitute primary tappings of the first and second transformers, wherein the secondary tappings belong to two sets of three tappings symmetrically disposed about said primary tappings, one set being oriented clockwise, the other set being oriented counterclockwise relative thereto; and at least two three-phase forked wye-connected output windings inductively coupled with said core, wherein the two three-phase forked wye-connected output windings include an in-phase coil and vector coils for each of said phases, one of said in-phase coils for a first of said phases being connected between a common neutral and two vector coils corresponding respectively to the remaining two phases, the two vector coils being connected to separate output terminals, thereby phase shifting the output windings relative to each other, wherein the one set of secondary tappings forming within the hexagon form a first triangle having each side extending from a point defined on one long winding by a predetermined number of ampere-turns of said one long winding to a point defined on the next long winding by the same said predetermined number of ampere-tums, said points being counted from the end of an adjoining short winding preceding clockwise, with said other set of secondary tappings form a second triangle disposed similarly within the hexagon, said predetermined number of ampere-turns being counted from the end of an adjoining short winding preceding counterclockwise wherein the forked wye transformer has at least one asymmetric form having a longer prong and a shorter prong wherein the longer prong produces a larger voltage than the shorter prong.