pilot relaying

pilot relaying

[′pī·lət rē‚lā·iŋ]
(electricity)
A system for protecting transmission consisting of protective relays at line terminals and a communication channel between relays which is used by the relays to determine if a fault is within the protected line section, in which case all terminals are tripped simultaneously at high speed, or outside it, in which case tripping is blocked.
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References in periodicals archive ?
To cope with nearby faults in zone 1, when the fault impedance is not negligible, the criterion may be used in combination with pilot relaying. Alternatively the criterion is only applied for the time delayed zones as swings are rarely a major concern for zone 1 elements.