Gas insulated switchgear developed to meet increased load demand in Los Angeles Basin

Southern California Edison (SCE) energized the Rancho Vista gas insulated substation (GIS) on May 29, 2009. The substation uses a breaker-and-a-half scheme rated 63 kA at 550 kV and 80 kA at 245kV. The main buses at each voltage are rated 7,500 A continuous. The 500/230 kV substation was built to satisfy rapid load growth and increased reliability requirements for the northeastern Los Angeles Basin.