Patents by Inventor Helmut Hager

Helmut Hager 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).

  • Zone protective directional relay scheme
    Patent number: 4689708
    Abstract: A protective system for protecting elements (for example D) of an electric power system allocates a protection zone to each element. The protection zones are defined by switching points (for example 19', . . . , 24') which isolate the associated element (for example D) from the power system. Each of these switching points is associated with a transmitter/actuator unit (for example 19, . . . , 24). The transmitter/actuator units (for example 19, . . . , 24) produce "open" commands for their associated switching points (for example 19', . . . , 24') if it is determined that a fault has occurred inside the associated protection zone. The "open" commands for the switching points (for example 19', . . . , 24') are formed locally within the vicinity of each of the switching points.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: August 25, 1987
    Assignee: BBC Brown, Boveri & Co., Ltd.
    Inventors: Helmut Hager, Jurgen Kopainsky, Kurt Zwahlen