Directional Pilot Relaying
A ‘unit’ form of protection may be used when it is important to clear all faults simultaneously at both ends of the protected section of line, such as when high-speed automatic reclosing is used. For unit protection it is necessary to exchange information about the fault conditions at each end of the protected section and either a pilot-wire or a carrier channel is used for this purpose.
KeywordsFault Detector Carrier Signal Fault Current Protective Relay Ground Fault
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