Patents Examined by Patrick R. Sole
  • Offset keying technique for segregated phase comparison relaying
    Patent number: 3986079
    Abstract: A phase comparison relaying network wherein a transmitter keying threshold is set at a predetermined value of the current wave at the transmitter end which is offset from the effective zero axis of the current wave. This yields a signal which, when phase compared with the current wave at the receiver end of the protected line section, permits a tripping response in the presence of "outfeed" current at the "weak feed" end of the protected line section which might occur during an internal fault.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: October 12, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: Walter L. Hinman, Jr., Russell W. Gonnam