Patents by Inventor Yukio Sukegawa

Yukio Sukegawa 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).

  • Test method and apparatus for testing a protective relay system
    Patent number: 5786699
    Abstract: A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite and outputting a time signal, simulation signal generators, respectively connected to the protective relays, each simulation signal generator generating a simulation signal and inputting the simulation signal to a corresponding protective relay, and synchronous starting units, respectively provided in the protective relays, each synchronous starting unit starting a corresponding simulation signal generator to generate the simulation signal, when time signals output from the GPS receivers coincide with a preset time at a same time.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: July 28, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yukio Sukegawa, Tetsuo Matsushima
  • Test method and apparatus for testing a protective relay system
    Patent number: 5666060
    Abstract: A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite and outputting a time signal, simulation signal generators, respectively connected to the protective relays, each simulation signal generator generating a simulation signal and inputting the simulation signal to a corresponding protective relay, and synchronous starting units, respectively provided in the protective relays, each synchronous starting unit starting a corresponding simulation signal generator to generate the simulation signal, when time signals output from the GPS receivers coincide with a preset time at a same time.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: September 9, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yukio Sukegawa, Tetsuo Matsushima
  • Test method and apparatus for testing a protective relay system
    Patent number: 5576625
    Abstract: A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing time data included in a signal transmitted from a satellite and outputting a time signal, simulation signal generators, respectively connected to the protective relays, each simulation signal generator generating a simulation signal and inputting the simulation signal to a corresponding protective relay, and synchronous starting units, respectively provided in the protective relays, each synchronous starting unit starting a corresponding simulation signal generator to generate the simulation signal, when time signals output from the GPS receivers coincide with a preset time at a same time.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: November 19, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yukio Sukegawa, Tetsuo Matsushima