The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2012
Filed:
Jan. 28, 2010
Casper A. Labuschagne, Pullman, WA (US);
Normann Fischer, Colfax, WA (US);
Satish Samineni, Pullman, WA (US);
Armando Guzman-casillas, Pullman, WA (US);
Casper A. Labuschagne, Pullman, WA (US);
Normann Fischer, Colfax, WA (US);
Satish Samineni, Pullman, WA (US);
Armando Guzman-Casillas, Pullman, WA (US);
Schweitzer Engineering Laboratories Inc, Pullman, WA (US);
Abstract
A power system may comprise two or more transformers operating in parallel. A voltage differential may exist between the transformers, which may create a circulating current in the power system. The system voltage of the power system may be modified by performing a tap change operation on one or more of the transformers. The tap change operation may be configured to minimize the circulating current. The circulating current may be minimized by determining the bias between the transformers using an angular difference between the transformer currents. The angular difference may be calculated using time-aligned measurement data. A tap change operation configured to modify the system voltage, while minimizing circulating current, may be determined using the transformer bias.