Patents by Inventor Urban Åström

Urban Åström 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).

  • Device for supervising a high voltage converter station
    Patent number: 6205039
    Abstract: A device in a valve on high voltage potential level and in a high voltage converter station comprises members arranged on high voltage level and adapted to detect parameters of a voltage divider circuit consisting of resistances (24, 25) and capacitors (27, 28) connected in series and across each thyristor of said valve. The capacitors are of self-healing type, in which from the point of time for occurring of a possible fault thereof the capacitance is gradually reduced, and said members are adapted to carry out measurements so as to determine whether the capacitance of the capacitors is changed over the time.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: March 20, 2001
    Assignee: ABB AB
    Inventors: Urban Åström, Hans Björklund, Krister Nyberg, Roland Siljeström, Gunnar Asplund
  • Plant for transmitting electric power including bidirectionally controlled thyristors (BCT)
    Patent number: 6198641
    Abstract: In a plant for transmitting electric power between two stations (17, 18) through a direct voltage network (16) for High Voltage Direct Current an arrangement (23) is arranged for draining electric power from the direct voltage network. The arrangement has a valve (24) made of bidirectionally controlled thyristors (BCT) with ability to conduct current in both directions therethrough. The plant has also a unit (25) adapted to control the thyristors of the valve so that the current direction between the direct voltage network and the valve is such that electric power is fed from the direct voltage network to an alternating voltage network- connected to the valve independently of the power feeding direction between said two stations (17, 18).
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: March 6, 2001
    Assignee: ABB AB
    Inventors: Urban Åström, Bruno Halvarsson, Lars Hermansson
  • HVDC power transmission system with cooling and switching device temperature detection
    Patent number: 6185116
    Abstract: A device for supervising the cooling of a cooling system of a valve of a high voltage converter station located on high voltage potential level comprises members (31) located on high voltage potential level and adapted to detect the temperature at cooling blocks (32) of the valve on high voltage potential level and send values so detected to first control units (3) for controlling semiconductor components (4) of the valve. The first control units have means (20) for treating said values detected and the first control units are adapted to send data resulting from said treatment to an arrangement (16) for supervising said valve located on low potential level.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: February 6, 2001
    Assignee: ABB AB
    Inventors: Urban Åström, Krister Nyberg, Roland Siljeström, Gunnar Asplund, Hans Björklund