Patents by Inventor James P. Garrity

James P. Garrity 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).

  • Loss-of-potential supervision for a distance relay
    Patent number: 4835651
    Abstract: Loss-of-potential supervision for a distance relay controlling a circuit breaker in a poly-phase electric power transmission system is provided by blocking circuit breaker trip signals in the presence of a low voltage condition and the absence of an increase in current of more than a predetermined amount. Overblocking is prevented for weak feed conditions, a circuit breaker closing on a fault, transients induced by replacement of a fuse, and sequencing caused by tripping of a remote breaker.
    Type: Grant
    Filed: April 5, 1988
    Date of Patent: May 30, 1989
    Assignee: Westinghouse Electric Corp.
    Inventors: Hung J. Li, James P. Garrity