Patents by Inventor Sadanori Neo

Sadanori Neo 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).

  • Ground fault current limiter and method of limiting ground fault current
    Patent number: 5699219
    Abstract: A ground fault current limiter, in which reactors are connected in series to a neutral point for compensating for capacitances to ground of a power switches capable of turning ON/OFF at a high speed are connected in parallel with respective reactors, occurrence of a ground fault is detected from a phase difference between a zero-phase sequence current and a zero-phase sequence voltage at time of sampling, an optimal compensation quantity of capacitances to ground is computed based on the zero-phase sequence current and the zero-phase sequence voltage at time of occurrence of a ground fault, and ON/OFF of the switches are controlled thereby to alter the reactor quantity so as to correspond to the compensation quantity.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: December 16, 1997
    Assignees: Hitachi, Ltd, Chubu Electric Power Co., Inc.
    Inventors: Hiroshi Arita, Junzo Kida, Yoshiaki Matsui, Tokio Yamagiwa, Shigeyuki Sugimoto, Sadanori Neo