What is directional overcurrent protection?
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Such relays are called as directional overcurrent relays. They are used in distribution system or subtransmission system where 'ring main' configuration is used to provide more reliability of service.
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An important concept in the application of directional overcurrent relays is polarization. Polarization is the method used by the relay to determine the direction of current flow. Forphase directional overcurrent relays, this is accomplished by the use of voltage transformers, which provide a voltage signal to the relay and allow it to distinguish the current direction.
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