Switching Surges and Arrester and Gap Performance during 200-Kv Line-Dropping Tests

A series of line-dropping field tests on the 220-kv Saugus-Santa Clara transmission line of the Southern California Edison Company indieated unexplained circuit breaker bushing-gap sparkover and abnormally low lightning arrester sparkover on surges caused by circuit breaker restriking. The portion Bf seqweynte test was set up on a system in miniature to facilitate interpretation and analysis of the field results and verify measurement techniques. Significant data pertaining to the nature of surge voltages and lightning arrester and bushing-gap performance are presented.