Broken conductor detection in a multiple-phase electric power delivery system
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsJordan Bell, Kanchanrao Gangadhar Dase, Sajal Harmukh, Normann Fischer, Daqing Hou
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Abstract
Disclosed herein are systems for determining a broken conductor condition in a multiple-phase electric power delivery system. It has been observed that broken conductors pose a safety concern when occurring in the presence of people or vulnerable environmental conditions. Broken conductor conditions disclosed herein may be used to detect and trip the phase with the broken conductor, thus reducing or even eliminating the safety risk. Further, a distance to the opening may be determined.
Claims20
A system for detecting an open conductor in a multiple-phase electric power delivery system, comprising:
- an intelligent electronic device (IED) receiving current signals from each of the multiple phases of the electric power delivery system;
- the IED including:
- a power system signal input for receiving electric power delivery system signals including the current signals from each phase of the multiple phases;
- an open conductor element to:
- calculate positive-sequence currents from the current signals;
- calculate zero-sequence currents from the current signals;
- calculate negative-sequence currents from the current signals;
- determine an open conductor condition using the positive-sequence current, zero-sequence current, and negative-sequence current;
- and,
- a phase detection element to:
- calculate a first angle difference between the positive-sequence current and the negative-sequence current;
- calculate a second angle difference between the positive-sequence current and the zero-sequence current;
- and,
- determine the phase that includes the open conductor using the first angle difference and the second angle difference;
- and,
- a protective action module to effect a protective action upon determination of the open conductor condition and the determination of the phase that includes the open conductor.
A method for detecting an open conductor in a multiple-phase electric power delivery system, comprising:
- receiving, by an intelligent electronic device (IED), electric power delivery system signals including current signals from each phase of the multiple phases of the electric power delivery system;
- calculating positive-sequence currents from the current signals;
- calculating zero-sequence currents from the current signals;
- calculating negative-sequence currents from the current signals;
- determining an open conductor condition using the positive-sequence current, zero-sequence current, and negative-sequence current;
- calculating a first angle difference between the positive-sequence current and the negative-sequence current;
- calculating a second angle difference between the positive-sequence current and the zero-sequence current;
- determining the phase that includes the open conductor using the first angle difference and the second angle difference;
- effecting a protective action upon determination of the open conductor condition and the determination of the phase that includes the open conductor.
Dependencies are inferred from the claim text.