are covered in companion papers [1 ]-[8].
A number of basic station design varieties were required. For
example, not only did the stations differ in the number of circuits,
but-transformers were utilized to step-down from 765 kV to 500,
345, and 138 kV. In addition, a number of generating unit transformers
step up directly to 765 kV. The scale of the engineering,
design, and construction problems involved in developing these
stations immediately indicated the need for a building block
approach so that similar designs could be used at various locations.-,
Th-engineering .and design features of the. low-voltage
parts of these stations will not be treated in detail in this paper
although certain key aspects will be mentioned.