US 12,260,985 B2
Three-phase multi-tap balancing distribution transformer
James Patrick Nunamaker, Shawnee, OK (US); Ryan Joe Umber, Oklahoma City, OK (US); and Willian Aristides Martinez, Oklahoma City, OK (US)
Assigned to Southwest Electric Co., Oklahoma City, OK (US)
Filed by Southwest Electric Co., Oklahoma City, OK (US)
Filed on Oct. 19, 2022, as Appl. No. 17/969,436.
Claims priority of provisional application 63/270,803, filed on Oct. 22, 2021.
Prior Publication US 2023/0131007 A1, Apr. 27, 2023
Int. Cl. H01F 29/04 (2006.01); H01F 29/02 (2006.01)
CPC H01F 29/04 (2013.01) [H01F 29/025 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A three-phase, multi-tap transformer comprising:
a primary side, the primary side configured to receive input power from a power source;
a secondary side operably coupled with the primary side, the secondary side having output terminals for conveying output power to each phase, the secondary side having a plurality of taps thereon, wherein each tap corresponds to a different turns ratio between the primary side and the secondary side;
a three-phase tap change switch operably coupled to the secondary side, wherein the three-phase tap change switch is configured to adjust a turns ratio between the primary side and the secondary side and thereby provide output power at varying voltage amounts; and
a phase-specific balancing tap switch operably coupled to the secondary side, wherein the phase-specific balancing tap switch is configured to adjust an output voltage of an applicable phase by an incremental amount and independent of an output voltage of each of the other phases.