Single-Pole Reclosing Tests on Long 275-Kv Transmission Lines

This paper discusses field tests and operating experience on long 275-kv transmission lines. Successful single-pole reclosing depends upon the self-extinction of the secondary arc which persists after the interruption of the power arc upon the isolation of the faulted phase. Analysis of the test oscillograms showed the secondary arc to be inherently unstable. Operating experience during the 21 months since commissioning confirms these results as all reclosures have been successful.