Patents by Inventor Uno Gäfvert

Uno Gäfvert 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).

  • Electrical insulation system
    Patent number: 9466409
    Abstract: An electrical insulation system for a high voltage inductive device includes a cylindrical insulation barrier defining an axial direction, a longitudinal bar having a main extension in the axial direction, the longitudinal bar arranged to support the cylindrical insulation barrier along the axial direction and to provide spacing in a radial direction, and the longitudinal bar having a first side facing the cylindrical insulation barrier and a second side, opposite the first side, having a groove, and a spacer having a main extension in the radial direction, the spacer being arranged to provide spacing in the axial direction, the spacer having a groove fitting end portion. The longitudinal bar is adapted to receive the groove fitting end portion of the spacer in the groove, and wherein the spacer is dimensioned so relative to the groove that the groove captures any streamer propagating from the spacer towards the cylindrical insulation barrier.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: October 11, 2016
    Assignee: ABB Schweiz AG
    Inventors: Anders Bo Eriksson, Uno Gäfvert, Josë-Luis Del Real, Jan Hajek
  • Electrical Insulation System
    Publication number: 20160093421
    Abstract: An electrical insulation system for a high voltage inductive device includes a cylindrical insulation barrier defining an axial direction, a longitudinal bar having a main extension in the axial direction, the longitudinal bar arranged to support the cylindrical insulation barrier along the axial direction and to provide spacing in a radial direction, and the longitudinal bar having a first side facing the cylindrical insulation barrier and a second side, opposite the first side, having a groove, and a spacer having a main extension in the radial direction, the spacer being arranged to provide spacing in the axial direction, the spacer having a groove fitting end portion. The longitudinal bar is adapted to receive the groove fitting end portion of the spacer in the groove, and wherein the spacer is dimensioned so relative to the groove that the groove captures any streamer propagating from the spacer towards the cylindrical insulation barrier.
    Type: Application
    Filed: May 19, 2014
    Publication date: March 31, 2016
    Applicant: ABB TECHNOLOGY LTD
    Inventors: Anders Bo Eriksson, Uno Gäfvert, José-Luis Del Real, Jan Hajek
  • High voltage bushing
    Patent number: 8802993
    Abstract: A high voltage bushing including a metal part provided with a resistive layer.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: August 12, 2014
    Assignee: ABB Research Ltd.
    Inventors: Christer Törnkvist, Uno Gäfvert
  • High voltage DC bushing and device comprising such high voltage bushing
    Patent number: 8088996
    Abstract: A high voltage DC bushing including a fluid duct with non-constant width (?r) along the axial direction of the bushing.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: January 3, 2012
    Assignee: ABB Research Ltd.
    Inventors: Christer Törnkvist, Uno Gäfvert
  • Method and apparatus for administering passivator to a conductor
    Patent number: 7989019
    Abstract: A method for administering passivator to a conductor in a power transformer, comprising providing a reservoir of the passivator, wherein the reservoir is provided by adding the passivator to solid insulation prior to impregnating the solid insulation with oil, and wherein the passivator is added to the solid insulation as the solid insulation is applied to a conductor.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: August 2, 2011
    Assignee: ABB Technology Ltd.
    Inventor: Uno Gäfvert
  • HIGH VOLTAGE SHIELD
    Publication number: 20100089617
    Abstract: A high voltage corona shield including a body portion including a polymer material.
    Type: Application
    Filed: August 31, 2007
    Publication date: April 15, 2010
    Inventors: Ralf Hartings, Uno Gäfvert, Kerstin M. Ekeroth Reijm, Thomas Eriksson, Tommy L. Larsson