Current-Only Directional Overcurrent Relay

doi:10.1109/JSEN.2010.2094186

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Current-Only Directional Overcurrent Relay

2011-06-01

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Abhisek Ukil *

Vishal H Shah

DOI：10.1109/JSEN.2010.2094186

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Abstract

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Overcurrent 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 reference voltage phasor for estimating the direction of the fault, requiring both current and voltage sensors. This increases the cost of the relays, prohibiting the utilization of such relays in the distribution side protection and automation, which is going to be a key part in the smart grid initiative. In this paper, a novel current-only directional detection possibility is highlighted.

Keywords:

Definite minimum time (DMT) distribution automation (DA)

fault detection

fault direction

inverse definite minimum time (IDMT)

overcurrent

protection

smart grid