Detection of a fault in an ungrounded electric power distribution system
First Claim
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.
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Accused Products
Abstract
Detection of a fault in an ungrounded electric power distribution system that includes a plurality of feeders and buses is disclosed herein. Embodiments consistent with the present disclosure may monitor an electrical parameter associated with each of a plurality of feeders and buses in the ungrounded electric power distribution system. An incremental change in the monitored electrical parameters may be determined using the monitored electrical parameter. Further, the incremental change may be associated with a first sub-set of the plurality of feeders. Torque values for the feeders may be calculated using a reference quantity from the bus first exhibiting an incremental change above a threshold. A feeder having the largest incremental change in the first sub-set of the plurality of feeders may be identified. A fault may be identified based on the torque and the incremental change.
101 Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3)
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4. A method for detecting a faulted feeder in an ungrounded electrical power distribution system comprising a plurality of buses and feeders, the method comprising:
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monitoring an electrical parameter associated with each of the plurality of feeders and buses; an Intelligent Electronic Device (“
IED”
) determining an incremental change in the monitored electrical parameters associated with the plurality of feeders and buses;the IED identifying a first bus of the plurality of buses having an incremental change exceeding a threshold; the IED calculating a reference value using voltage measurements from the identified first bus; the IED calculating an incremental change for each feeder of a subset of feeders of the plurality of feeders; the IED calculating torque values for the subset of feeders based on the reference value and the incremental changes; and identifying the faulted feeder as a feeder with the greatest calculated incremental change. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An intelligent electronic device (IED) for detecting a faulted feeder in an ungrounded electrical power distribution system that includes a plurality of buses and feeders, the IED comprising:
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a sensor component in electrical communication with the electric power distribution system for obtaining electric power system information from the electric power distribution system; a communications interface in communication with another IED for receiving electric power system information therefrom; wherein the electric power system information obtained comprises bus voltage information and feeder current information; 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. - View Dependent Claims (17, 18, 19, 20)
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Specification