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In this study, algorithms for directional relays using only current measurements are presented. Developed for radial distribution networks, these algorithms will determine fault direction based on ratios between variations of sequence currents during and before faults: ΔI2/ΔI0 ratio for line-to-ground faults and the ΔI2/ΔI1 ratio for line-to-line faults. The ratios are used as input of a support vector...
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