Patents Represented by Attorney D. R. Lacey
  • Patent number: 4234901
    Abstract: Protective relay apparatus which performs a segregated phase current comparison of a three-phase protected line section, with a single relay at each end thereof for making the phase current comparison. The single relay includes a rectifier arrangement which provides a signal responsive to the largest phase current of a predetermined polarity, at any instant. In response to a fault detection, it successively phase compares the signals from its rectifier with the signals of the corresponding phases from the rectifier in the relay at the other line end.
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: November 18, 1980
    Assignee: Westinghouse Electric Corp.
    Inventor: William A. Strickland, Jr.