G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/08 (2006.01) H02H 3/34 (2006.01)
Patent
CA 2108442
The angle between the negative sequence and zero sequence currents for a power signal on a transmission lute is measured and compared against a plurality of successive angle ranges from 0° to 360°. If the angle is 0° ~ 30°, an AG fault is indicated and a first section output is produced blocking ground elements BG and CG and phase-to-phase elements AB and CA. Art angle of 120° ~ 30° indicates a BG fault, resulting in a second output blocking ground elements AG and CG and phase-to-phase elements AB and CG, while a phase angle of 240° ~ 30° indicates, a CG fault, resulting in a third output blocking ground elements AG and BG and phase-to-phase elements BC and CA. If the phase angle is not covered by the above three primary ranges, then a second stage of comparisons arc made, including determining the magnitudes of the phase-to-phase distance elements, and then comparing the phase-to-phase resistance of the lowest of those with the apparent resistance of the one ground element, i.e, AG, BG or CG, associated with the non-primary (secondary) range of angles which includes the measured phase angle. If selected criteria are met, then an output is asserted to block the ground and phase-to-phase elements noted above associated with that ground element.
Roberts Jeffrey B.
Schweitzer Edmund O. III
Ridout & Maybee Llp
Schweitzer Engineering Laboratories Inc.
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