Junior Member
Posted June 25, 2015
I haven't had much if any experience with protective relays. Can someone explain what directional relays are typically used for?
NETA Level III
Posted June 25, 2015
Pro Subscriber
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.
NETA Level III
Posted June 25, 2015
Pro Subscriber
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.
NETA Level III
Posted June 28, 2015
GE's Art & Science of Protective Relay
downloadable PDF
http://www.gedigitalenergy.com/multi...sci/artsci.pdf
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