Abstract—Projections of population growth in the metropolitan Tucson area require that the electric transmission grid in the region be expanded and upgraded.  A key component of this expansion is a new 500-kV transmission line northwest of Tucson originating at the Pinal Central Substation, a major regional hub with access to numerous generating facilities, and extending approximately 66 km to the Tortolita Substation.

Index Terms—Power System Reliability, Substations, Transmission Lines

Authors:
Calvin Y. Yanaga, Anthony M. Murphy, Michael W. Clark - Sargent & Lundy