Patent ID: 9128140
Filing Date: 2015-09-08
Classification: G01R,H02H,Y04S

Abstract:
1. A system for detecting a faulted feeder in an ungrounded electrical power distribution system comprising a plurality of buses and feeders, the system for detecting comprising: a plurality of intelligent electronic devices (IEDs) in electrical communication with the buses and feeders to obtain electrical signals therefrom; each IED comprising a communications module and a communications interface for communicating electric power information from the buses and feeders; a stationary phasor generator module configured to calculate stationary phasors for voltage information from the buses and current information from the feeders; a magnitude and angle module for calculating magnitudes and angles of the voltage information from the buses and current information from the feeders; an incremental change module for calculating an incremental change in voltage for each bus, and calculating an incremental change in current for each feeder; a torque module for calculating a torque value for each feeder based on the torque value for a first bus with a first incremental change exceeding a threshold and the incremental change in current for each feeder, and determining a relative direction of torque for each feeder; and, a fault determination module for identifying a faulted feeder based on the determined torque and relative direction of torque of each feeder.