Haploid three wire system auto-transformer

摘要

PROBLEM TO BE SOLVED: To improve the balance between R- and T-phase winding resistances and reduce the leakage inductance and, at the same time, to improve the efficiency of winding and connecting works by longitudinally arranging coils for R- and T-phases wound around a shell type iron core in the same shape in the height direction of a core window and connecting a neutral point. ;SOLUTION: After coils 4 and 5 for R- and T-phases 6 and 7 are assembled in the same form, the coils 4 and 5 are wound around the center leg of a shell type iron core 2 in the direction, in which magnetic fluxes are electrically applied. A transformer is assembled by winding the serial and shunt coils of the R-phase 6 around the half of the center leg in the height direction of the window of the core 2 and the serial and shunt coils of the T-phase 7 around the remaining half of the center leg so that the coils of the R- and T-phases 6 and 7 can be closely arranged in series within the extent in which the insulating performance is not deteriorated. When the transformer is assembled in such a way, the balance between R- and T-phase winding resistances can be improved and the leakage inductance of the transformer can be reduced. In addition, the winding and connecting works of the coils can be carried out with high efficiency, because the number of the connecting points of the coils becomes the necessary minimum.;COPYRIGHT: (C)1997,JPO