directional relay

directional relay

[də′rek·shən·əl ′rē‚lā]
(electricity)
Relay which functions in conformance with the direction of power, voltage, current, pulse, rotation, and so on.
References in periodicals archive ?
The secondary scheme of protection is implemented by a 67-overcurrent directional relay for faults between phases and a 67N overcurrent directional relay for faults from phase to ground.
A special feature on the CS, "Output Relay Interlocking," keeps directional relays interlocked meaning there can only be one crane operation at a time, such as forward or reverse.

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