×
Follow Us
Results 1 to 4 of 4

What are directional relays are typically used for?

 Jump to latest post
    #1
  1. Join Date
    Jun 2015
    Posts
    12
    Reputation

    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?

  2. #2
  3. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    506
    Reputation

    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.

  4. #3
  5. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    506
    Reputation

    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.

  6. #4
  7. Join Date
    Mar 2015
    Location
    Pittsburgh, PA
    Posts
    10
    Reputation

    Re: directional relays

    GE's Art & Science of Protective Relay
    downloadable PDF

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

Subscribe

Login or register to leave a reply!


Share this thread

Related Topics

  1. Optional maintenance tests for microprocessor relays
    By DetroitLions in forum NETA Level 3 Exam
    Replies: 2
    Last Post: February 1, 2016, 07:31 AM

Tags for this Thread

Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support