Patents by Inventor Leonid Husak

Leonid Husak 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).

  • Protective relay apparatus and method for providing single-pole tripping
    Patent number: 4536815
    Abstract: An apparatus and method for detecting a single-phase-to-ground fault on a three-phase electrical power system and for identifying the faulted phase conductor. Each phase conductor is monitored by evaluating three phasor signals associated therewith, i.e., the zero sequence current of the electrical power system, the negative sequence voltage on the phase conductor rotated 90 electrical degrees counterclockwise (or the negative sequence current on the phase conductor), and the quadrature phase voltage for the phase conductor rotated 30 electrical degrees counterclockwise. The coincidence of these three signals for a predetermined time indicates the occurrence of a single-phase-to-ground fault on the monitored phase conductor.
    Type: Grant
    Filed: August 29, 1983
    Date of Patent: August 20, 1985
    Assignee: Westinghouse Electric Corp.
    Inventors: Hung J. Li, Leonid Husak