Transformer-rectifier apparatus
AssigneeWestinghouse Electric Corp.
InventorJohn Rosa
Life of this patent
Estimating the term…
Abstract
A three-phase transformer having a delta-connected primary and two identical secondary windings per phase connected in hexagon, has symmetrical taps on each secondary winding connected to rectifying devices for generating DC energy from a first group of six symmetrical AC voltages at 60.degree. with respect to the virtual neutral for one polarity and from a second group of six symmetrical AC voltages at 60.degree. with respect to the virtual neutral for the other polarity, the first and second groups being at 30.degree. phase shift to one another.
Claims13
In a system for converting three-phase alternating current (AC) power into direct current (DC) derived between a positive and a negative DC output terminal, the combination of:
- a transformer having, (1) three primary windings connected to the respective phases of said AC power;
- (2) six identical secondary windings connected into a closed regular hexagon, with two secondary windings for one primary winding;
- (3) a total of twelve taps on said secondary windings distributed at substantially identical central angles on said regular hexagon, with a pair of taps for each secondary winding;
- a rectifier circuit having twelve rectifier devices operatively connected in two groups, one positive group to the positive DC output terminal and one negative group to the negative DC output terminal;
- with one tap of each pair of taps of a winding being associated with one rectifier of one group, the other tap being associated with a rectifier of the other group.
In a system for converting three-phase alternating current (AC) power into direct current (DC) derived between a positive and a negative DC output terminal, the combination of:
- three identical transformers each having, (1) one primary winding connected to one of the respective phases of said AC power;
- (2) two identical secondary windings;
- (3) two symmetrically disposed taps on said secondary windings with said secondary windings being connected from one transformer to another so as to form a regular hexagon;
- a rectifier circuit having twelve rectifier devices operatively connected in two groups, one positive group to the positive DC output terminal and one negative group to the negative DC output terminal;
- with one tap of each pair of taps of a winding being associated with one rectifier of one group, the other tap being associated with a rectifier of the other group.
Dependencies are inferred from the claim text.