Patents by Inventor Samuel L. Magruder

Samuel L. Magruder 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 protective apparatus and method
    Patent number: 4068275
    Abstract: Apparatus for protecting power distribution networks from damage due to ground faults comprises a plurality of groups of zero sequence current monitors, each group surrounding all branches of the network which enter a zone of protection. Each group is electrically connected to produce an output signal corresponding to the vector sum of differential currents flowing into and out of the zone. Each group is connected to a ground fault relay which will trip when the vector sum of the differential currents entering or leaving a zone is above a predetermined level.
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: January 10, 1978
    Assignee: Westinghouse Electric Corporation
    Inventors: Billy E. Teel, Samuel L. Magruder