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What are directional relays are typically used for?

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    What are directional relays are typically used for?

    I haven't had much if any experience with protective relays. Can someone explain what directional relays are typically used for?

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    directional relays

    This type of relay operates in on direction of current flow and blocks in the opposite direction. Three conditions must be satisfied for its operation: current magnitude, time delay and directionality. The directionality of current flow can be identified using voltage as a reference of direction.

    Directional relays are commonly used to protect against generator motoring, such as preventing excess power flow from a small generating station into a larger system. They can also be used to protect systems with networks and/or closed bus ties.

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    GE ICW power directional relay

    Check out this cutsheet for a GE ICW power directional relay, it gives a good overview of it's theory and various applications. https://www.gedigitalenergy.com/prod...chures/icw.pdf
    Last edited by SecondGen; June 25, 2015 at 07:15 PM.

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    Re: directional relays

    GE's Art & Science of Protective Relay
    downloadable PDF

    http://www.gedigitalenergy.com/multi...sci/artsci.pdf

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