Patents by Inventor David Dickmander

David Dickmander 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).

  • Method and apparatus for mitigation of dynamic overvoltage
    Patent number: 8411400
    Abstract: A distribution and power transformer has its primary connected to the high voltage bus of the network and its secondary connected to a switching device. Upon the occurrence of a condition known to cause a dynamic overvoltage (DOV) and the occurrence of the DOV, a control system causes the switching device to change from a nonconductive mode to a conductive mode in less than the time for one cycle of the operating frequency of the AC network. This change in switching device conduction places a short circuit across the transformer secondary and thus mitigates the DOV.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: April 2, 2013
    Assignee: ABB Technology AG
    Inventors: Ulf Andersson, Hans Bjorklund, John Daniel, David Dickmander
  • METHOD AND APPARATUS FOR MITIGATION OF DYNAMIC OVERVOLTAGE
    Publication number: 20100053830
    Abstract: A method and apparatus for mitigating dynamic overvoltage (DOV) in an AC network. A distribution and power transformer has its primary connected to the high voltage bus of the network and its secondary connected to a switching device. Upon the occurrence of a condition known to cause a DOV and the DOV a control system cause the switching device to change from a nonconductive mode to a conductive mode in less than the time for one cycle of the operating frequency of the AC network. This change in switching device conduction places a short circuit across the transformer secondary.
    Type: Application
    Filed: February 26, 2008
    Publication date: March 4, 2010
    Applicant: ABB TECHNOLOGY AG
    Inventors: Ulf Andersson, Hans Bjorklund, John Daniel, David Dickmander