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. 04, 2014
Filed:
Jun. 13, 2011
Frederick R. Faxvog, Long Lake, MN (US);
Wallace Jensen, Centerville, MN (US);
Gale Nordling, Excelsior, MN (US);
Greg Fuchs, River Falls, WI (US);
David Blake Jackson, Excelsior, MN (US);
Terry Lee Volkmann, St. Michael, MN (US);
James Nicholas Ruehl, Excelsior, MN (US);
Brian Groh, Prior Lake, MN (US);
Frederick R. Faxvog, Long Lake, MN (US);
Wallace Jensen, Centerville, MN (US);
Gale Nordling, Excelsior, MN (US);
Greg Fuchs, River Falls, WI (US);
David Blake Jackson, Excelsior, MN (US);
Terry Lee Volkmann, St. Michael, MN (US);
James Nicholas Ruehl, Excelsior, MN (US);
Brian Groh, Prior Lake, MN (US);
Emprimus, LLC, St. Louis Park, MN (US);
Abstract
A continuous grounding system for use in an alternating current system including a transformer is disclosed. The system includes a switch assembly connected between a transformer neutral of a transformer and a ground, the switch assembly having an open position and a closed position, the open position disrupting the path through the switch assembly between the electrical connection and the transformer neutral, and the closed position establishing a path connecting the electrical connection to the transformer neutral through the switch assembly, wherein in normal operation of the alternating current electrical device the switch assembly remains in a closed position. The system also includes a DC blocking component positioned in parallel with the switch assembly and connected between the transformer neutral and the ground. The system further includes a control circuit configured to control the switch assembly, the control circuit including a sensor configured to actuate the switch assembly to an open position upon detection of a predetermined harmonic signal threshold at one of the transformer phases or a predetermined threshold of DC current between the transformer neutral and ground.