Patents by Inventor Henrik ?shuvud

Henrik ?shuvud has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Load compensation in distance protection of a three-phase power transmission line
    Patent number: 8159229
    Abstract: A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: April 17, 2012
    Assignee: ABB Technology Ltd.
    Inventors: Magnus Akke, Björn Westman, Henrik Åshuvud