New 138-Kv Cable Lines in Los Angeles

The first 138-kv underground transmission cables to be installed west of Chicago and the largest now in use at this voltage (except for short station runs) were placed in service during 1943 by the Los Angeles Department of Water and Power. While generally similar to 138-kv lines previously installed in the East this installation involves a number of novel design features which make it of more than usual interest. The paper describes these features and some of the studies of carrying capacity, cable movements, sheath voltages, oil supply and alarm, and sheath corrosion, which led to their development, and includes a summary of significant data and characteristics of the installation.