Patents by Inventor Mitsuga Haginoya

Mitsuga Haginoya 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).

  • Gas insulated switchgear system having single phase reserve bus
    Patent number: 4933802
    Abstract: A gas insulated switchgear system having two gas insulated switchgear equipments, each of which consists of first disconnecting switches, circuit breakers, and second disconnecting switches, three phase gas insulated buses which are respectively connected to the first disconnecting switches of the two gas insulated switchgear equipments in every three phases thereof, a single phase reserve buses which are commonly connected to all of the second disconnecting switches of the two gas insulated switchgear equipments, and an operating device for opening the circuit breakers and the first disconnecting switches in only one phase of the gas insulated switchgear equipments and closing the second disconnecting switch in only the one phase. A gas insulated switchgear system having single phase reserve bus is economical and switches one of the three phase main buses to the single reserve bus without forming short circuit.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: June 12, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuga Haginoya, Tohru Tsubaki, Shigeru Fujiya, Haruo Honda