Pilot schemes can generally be broken into two primary categories. Pilot schemes for transmission line protection (photo credit: Siemens) If the measured parameters exceed threshold values, appropriate actions are initiated. This system provides instantaneous relaying which … US3223891A - Pilot-wire protection of transmission lines - Google Patents Pilot-wire protection of transmission lines Download PDF Info Publication number ... pilot terminal wires line voltage Prior art date 1961-12-20 Legal status (The legal status is an assumption and is not a legal conclusion. Directional schemes use directional distance relays for phase fault detection and either directional distance relays … Advantages of Differential Pilot Wire Protection: This system can be used for ring mains as well as parallel feeders, This system provides instantaneous protection for ground faults. The pilot wire pairs (telephone twisted pair) are suitable for the transmission of analog signals with frequencies ranging from low frequency up to approximately 4 kHz (differential protection, phase comparison protection, voice frequency inter trip devices). Those categories are directional comparison and phase comparison.


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