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:
Sep. 25, 2012
Filed:
Jun. 07, 2010
Applicants:
Gary R. Hoffman, Randolph, NJ (US);
Jeffrey Anderson, Vancouver, WA (US);
Inventors:
Gary R. Hoffman, Randolph, NJ (US);
Jeffrey Anderson, Vancouver, WA (US);
Assignee:
Advanced Power Technologies, LLC, Randolph, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 7/04 (2006.01); H02H 5/06 (2006.01); H01F 27/10 (2006.01); H01F 27/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
The cooling system for a power transformer is activated by sensing and processing the frequency characteristic including the harmonic contents, of the inrush current into the transformer, when the transformer is first energized. The cooling system may include motors operating devices such as oil circulating pumps and fans causing a coolant to flow about the power transformer. The cooling system is deactivated by sensing when the transformer is de-energized and when its temperature is below a predetermined level.