A 5,000-kva underground substation

Because large increases in electrical usage in the downtown area of San Diego, Calif., began overtaxing the primary radial feeders of the San Diego Gas and Electric Company, it was decided to establish an entirely new substation to feed the area, taking advantage of existing 12-kv tie lines near by. The primary radial feeders were feeding a portion of the area from already heavily loaded substations and a new substation seemed to be a better solution to the problem than to increase facilities in the existing substations, where space was limited, and recopper lengthy radial feeders or install new ones.