Carrier relaying and rapid reclosing at 110 kv

This paper describes an application of carrier-current relaying combined with rapid reclosure of circuit breakers by means of which the continuity of service to a large industrial load supplied by a long single-circuit line was improved. A 110-kv line 120 miles long, forming part of an interconnected loop, has been equipped in this way to clear faults and restore service in approximately one second. The effect of the connected motor load on circuit interruption is also discussed.