VOLTAGE DERIVATIVE AND ZERO-SEQUENCE BROKEN CONDUCTOR DETECTION

摘要

A location of a broken electrical conductor of an electric power delivery system may be detected by monitoring a rate of change of phase voltage and/or a rate of change of zero-sequence voltage at various points on the conductor. Intelligent electronic devices (IEDs) such as phasor measurement units may be used to obtain measurements and calculate synchrophasors. The synchrophasors may be used by a central controller to determine which two continuous IEDs measure rates of change of voltages of opposite polarities, where the broken conductor is between the two continuous IEDs. The synchrophasors may be used by a central controller to determine which two continuous IEDs where one exhibits a zero-sequence voltage magnitude that exceeds a predetermined threshold for a predetermined time, wherein the zero-sequence voltage magnitude of the other of the continuous IEDs does not exceed the predetermined threshold.

主权项

1. A system for detecting a broken conductor, comprising:
a plurality of circuit breakers in electrical communication with a conductor, wherein each circuit breaker is configured to open and close an electrical path of the conductor; a plurality of intelligent electronic devices in communication with the plurality of circuit breakers and the conductor, such that each circuit breaker is in communication with at least one intelligent electronic device, wherein each intelligent electronic device is configured to obtain electrical measurements from the conductor, determine phasor data from the measurements, and transmit the phasor data; and a central controller device in communication with the plurality of intelligent electronic devices configured to receive the phasor data from the plurality of intelligent electronics and use the received phasor data to detect a broken conductor condition of the conductor based on the phasor data.