Title :
A New High-Speed Distance-Type Carrier-Pilot Relay System
Author :
Harder, E.L. ; Lenehan, B.E. ; Goldsborough, S.L.
Author_Institution :
Switchgear engineer with the Westinghouse Electric & Manufacturing company, East Pittsburgh, Pa.
Abstract :
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.
Keywords :
Circuit faults; Impedance measurement; Measurement standards; Power system protection; Power system relaying; Protective relaying; Standards development;
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
DOI :
10.1109/T-AIEE.1938.5057729
