Site Layout and Preparation Flashcards
Good grounding in a substation yard is essential in order for relays to be activated to open switchgears during ground faults.
True
To reduce the risk of shifting in substation foundations, topsoil and clay are removed and replaced with ? .
Stabilizing Backfill
The ideal location for a substation is ? , but out of public view.
Close to the Load Center
If the substation site had been used as a dumping ground, buried materials and toxic waste can be left in place if the proper compaction of the site is carried out.
False
The effects of electromagnetic fields on livestock and people have been disproved and are of no concern when picking a site for a future substation.
False
When an engineer plans for stormwater drainage or the flow of oil released accidentally, he or she will refer to a ? map.
Topographical
Soil resistivity is a factor in site selection because soil with a high resistance may require compensation measures so that the ? .
Ground Grid operates properly
Soil that is brought in to be used as fill material is referred to as ? .
borrow
Fill areas should be compacted in eight-inch layers to ? of the maximum density as mandated by ASSHTO Standard T180.
95%
The definition of the term soil ? is to mechanically increase the density of the soil.
Compaction
By mechanically increasing the density of the soil, swelling and contraction with the seasons are reduced.
True
Increasing soil density by putting particles in motion and moving them closer together is the ? method.
vibration
The four types of compaction are further divided into two basic types. These basic types are the ? type and the vibratory type.
static
In soil with too much moisture, the particles cannot move past each other, resulting in inadequate compaction.
False
Soils should never be over-compacted because it results in a weaker soil layer.
True
