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:
Jul. 07, 2015
Filed:
May. 21, 2013
Emprimus, Llc, St. Louis Park, MN (US);
Frederick R. Faxvog, Long Lake, MN (US);
Wallace Jensen, Centerville, MN (US);
Terrance R. Noe, Sebastopol, CA (US);
Craig Eid, Santa Rosa, CA (US);
David Blake Jackson, Excelsior, MN (US);
Greg Fuchs, River Falls, WI (US);
Gale Nordling, Excelsior, MN (US);
Emprimus, LLC, St. Louis Park, MN (US);
Abstract
Systems and method for detecting potentially harmful harmonic and direct current signals at a transformer are disclosed. One system includes a protection circuit electrically connected to a transformer neutral, the transformer electrically connected to a power grid, the protection circuit including a DC blocking component positioned between the transformer neutral and ground and one or more switches selectively actuated to form a path between the transformer neutral and ground in the event of unwanted DC current at the transformer neutral. The system also includes a control circuit electrically connected to the protection circuit and positioned to selectively actuate the switches based on observed conditions within the protection circuit. The system further includes a plurality of test connections disposed within the protection circuit and useable to test electrical properties of the protection circuit.