Title :
Pilot-wire relaying on a metropolitan system
Author :
LeClair, T. G. ; Michelson, E. L.
Author_Institution :
Commonwealth Edison Company, Chicago, Ill.
Abstract :
ANUMBER of papers have been written which discuss individual pilot-wire relaying schemes. A recent paper presented by the relay subcommittee of the committee on protective devices1 analyzed the pilot-wire circuit used in these relaying schemes. The present paper is a discussion of pilot-wire systems on a large metropolitan system where they have been in successful use for many years. The paper brings out the fact that pilot-wire relaying has many advantages over other forms of relaying because of selectivity and high-speed operation. It has also been found that the reliability of a complete relaying scheme is substantially better than would be expected from the record of the pilot-wire circuit as reported in the subcommittee paper at the 1943 winter technical meeting.
Keywords :
Circuit faults; Coils; Current transformers; Fault currents; Power cables; Relays; Wires;
Journal_Title :
Electrical Engineering
DOI :
10.1109/EE.1943.6435880