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Directional Overcurrent Relaying (67) Concepts
59th Annual Conference for Protective Relay Engineers, 2006., 2006Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. There are a variety of concepts by which this task is done. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays.
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Adaptive Settings of Directional Overcurrent Relay
2020 International Conference on Electrical Engineering (ICEE), 2020Power distribution system condition changes dynamically due to presence of distributed energy resources (DERs). This can cause failure of protection system of meshed system. To cope with changing system condition, settings of numerical directional overcurrent relays should be changed accordingly.
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Current-Only Directional Overcurrent Relay
IEEE Sensors Journal, 2011Overcurrent relays are widely used for protection of power systems, directional ones for transmission side, and nondirectional ones for distribution side. The fault direction may be forward (between relay and grid), or reverse (between relay and source), the normal power flow being from source to the grid. Known directional overcurrent relays rely on a
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