Patents by Inventor Tokushiro Uno

Tokushiro Uno 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).

  • Multi-terminal power line protection relay system
    Patent number: 8462475
    Abstract: A multi-terminal power line protective relay system is provided, which divides a power transmission line having four or more terminals into two or more power line sections composed of three adjacent terminals and portions of the power transmission line lying among the three adjacent terminals and one of the three adjacent terminals being shared by two adjacent power line sections, and includes protective relays at the respective terminals including a current-driven differential protective relay element for detecting a fault occurring in a power line section through current-differential calculation by using measured currents, inter-terminal communication channels linking two protective relays at two different terminals; and intra-terminal communication channels linking two protective relays at each shared terminal.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: June 11, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Chikashi Komatsu, Mitsuyasu Kido, Hideyuki Yoshioka, Tokushiro Uno
  • MULTI-TERMINAL POWER LINE PROTECTION RELAY SYSTEM
    Publication number: 20110310518
    Abstract: A multi-terminal power line protective relay system is provided, which divides a power transmission line having four or more terminals into two or more power line sections composed of three adjacent terminals and portions of the power transmission line lying among the three adjacent terminals and one of the three adjacent terminals being shared by two adjacent power line sections, and includes protective relays at the respective terminals including a current-driven differential protective relay element for detecting a fault occurring in a power line section through current-differential calculation by using measured currents, inter-terminal communication channels linking two protective relays at two different terminals; and intra-terminal communication channels linking two protective relays at each shared terminal.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 22, 2011
    Inventors: Chikashi KOMATSU, Mitsuyasu Kido, Hideyuki Yoshioka, Tokushiro Uno