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A New High-Speed Distance-Type Carrier-Pilot Relay System

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3 Author(s)
Harder, E.L. ; Switchgear engineer with the Westinghouse Electric & Manufacturing company, East Pittsburgh, Pa. ; Lenehan, B.E. ; Goldsborough, S.L.

This paper outlines the reasons for application of pilot relay equipment, particularly of the carrier-current type. A one-cycle carrier-pilot-relay scheme is described which now makes available the desirable high-speed and back-up characteristics of step-type distance protection combined with the 100 per cent simultaneous tripping feature possible with a pilot circuit. Impedance and over current supervised single-phase directional elements are utilized for controlling carrier on phase and ground faults, respectively.

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American Institute of Electrical Engineers, Transactions of the  (Volume:57 ,  Issue: 1 )