US 12,461,171 B2 · Single phase broken conductor detection

Abstract

The present disclosure relates to systems and methods to detect a fault in an electric power system. One embodiment may detect a single phase broken conductor in a multi-phase electric power system. An intelligent electronic device (IED) may receive a plurality of measurements over time of a current through an electrical conductor in the electric power system. Based on the measurements of the current, a fault detection subsystem may determine a zero-sequence current, a negative-sequence current, and a positive-sequence current. The fault detection subsystem may determine a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current, and may monitor the ratio over time. The fault detection subsystem may identify the broken conductor condition based on the ratio and a fault detection region. A protective action subsystem may implement a protective action based on identification of the broken conductor condition.

Claims24

Dependent claims

A system to detect a fault in an electric power system, the system comprising:

an intelligent electronic device (IED) to receive a plurality of measurements over time of a current through an electrical conductor in the electric power system;
a fault detection subsystem to monitor for a broken conductor condition and configured to:
determine a zero-sequence current based on the measurements of the current;
determine a negative-sequence current based on the measurements of the current;
determine a positive-sequence current based on the measurements of the current;
determine a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current;
monitor the ratio over a time;
and
identify the broken conductor condition based on the ratio;
and
a protective action subsystem to implement a protective action based on identification of the broken conductor condition.

8 more elements

A method of detecting a fault in an electric power system, the method comprising:

receiving, using an intelligent electronic device (IED) a plurality of measurements over time of a current through an electrical conductor in the electric power system to monitor for a broken conductor condition;
determining, using a fault detection subsystem, a zero-sequence current based on a measurement of the current;
determining, using the fault detection subsystem, a negative-sequence current based on the measurement of the current;
determining, using the fault detection subsystem, a positive-sequence current based on the measurement of the current;
determining, using the fault detection subsystem, a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current;
monitoring, using the fault detection subsystem, the ratio over a time;
identifying, using the fault detection subsystem, the broken conductor condition based on the ratio;
and
implementing, using a protective action subsystem, a protective action based on identification of the broken conductor condition.

6 more elements

Dependencies are inferred from the claim text.

Single phase broken conductor detection

Life of this patent

Single phase broken conductor detection

Life of this patent

Abstract

Claims24