Patents Assigned to Progress Energy Carolinas Inc.
  • Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities
    Patent number: 6879917
    Abstract: When a disturbance (for example, lightning strike) occurs on a high-voltage overhead transmission line, the line must be checked for any possible damage. If the distance-to-fault is known, line crews can be quickly dispatched for any necessary repair. The present invention is a fault location method and system that uses filtered, time-synchronized positive- or negative-sequence voltage and current measurements from both ends of the overhead transmission line to determine the exact distance to the fault with respect to either end.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: April 12, 2005
    Assignee: Progress Energy Carolinas Inc.
    Inventor: Steven P. Turner
  • Lifting and installing streetlight poles
    Patent number: 6648570
    Abstract: Streetlight poles are lifted to a vertical position for installation in a mounting hole or on a support stand by connecting the lift cable of a boom to an elongate sling that is releasably attached to the pole.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: November 18, 2003
    Assignee: Progress Energy Carolinas, Inc.
    Inventor: David J. Munn