7.2 Power-on Steps . . . .. . .. . . .. . .. . . .. . . .. . .. . . .. . .. . . .. . .. . . .. . . .. . .. . . .. . .. . . .. . .. . . .. . . .. . .. . . .. . .. . . .. . . 47 8 Troubleshooting. . . .. . .. . . .. . .. . . .. . . .. . .. . . .. . .. . .
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For most substation equipment support structures and line support structures, the foundations are required to resist moderate shear forces and overturning moments. For A-frame and lattice-type line support structures, shear, uplift, and compression are typical design loads.
The course also covered the design issues for substation foundations. Foundation design primarily depends on the in-place density and strength/strain properties of the soil on or in which foundations are located. The course reviewed the general considerations for the design and construction of a substation control house.
For pole-type line support structure foundations, a different method of foundation design is employed. These structures are designed on the basis of yield stress, and appropriate overload factors are applied to the structure loads. To complement these loadings, a foundation design is used utilizing the ultimate strength of the soil. See Figure 7.
The objective of site work design for a substation yard is to provide an easily accessible, dry, maintenance-free area for the installation and operation of electrical substation equipment and structures. The course also covered the design issues for substation foundations.
