DAM AND POWER PLANT
DAM
TRANSMISSION PLANT
Material and type
Concrete gravity spillway section; con-
TRANSFORMERS
crete powerhouse intake section; navi-
gation look; earth embankments; con-
Generator bank
crete bulkhead sections
Number
4 banks of three
Length
Type
1-phase, outdoor, self-cooled and air-blast oil-
Spillway section
insulated, with inert gas seal, Moloney
(including 21 - 7.5-ft piers)
1,037.5 ft
Rating (each bank)
36,000-kva self-cooled, 48,000-kva
Spillway bulkhead (2 - 40-ft bulkheads,
air blast, 13.2/161 kv, 60-cycle
2 - 7-1/2-ft and 1 - 8-1/2-ft piers)
105.5 ft
Bank to 110-ks switchyard
Earth embankments;
Left (south) bank 4,687 ft
Number
2 banks of three
Right (north) bank 977 ft
Type
1-phase, outdoor, self-cooled and air-blast,
North dam (bulkhead)
115 t
oil-insulated autotransformers with tap
Powerhouse and intake
580 ft
changing under load on 154-kv winding,
Navigation lock
215 ft
Westinghouse
Total
7,715 ft
Rating (each bank)
36,000-kva self-cooled, 48,000-kva
Maximum height (intake section, foundation to
forced air cooled 12.45- 115-
top of deck)
113 ft
14kv. 60-cyele, 12.45 -kw wind-
Maximum width at base:
Spillway section only 76.5 ft
ing. 4.500-kva self-cooled and
Including integral apron 149.3 ft
6,000-kva forced air cooled
Crest of earth embankments
Left (mouth) bank E1.435.5
SWITCHYARD
Right (north) bank E1.440.0
154-kv oil circuit
Spillway crest, masonry
E1.378.0
breakers
12 General Electric, rated 164-kv, 1,200-
Crest gate
22 fixed-wheel lift gates, 40-ft clear
ampere, 2,500,000-kva, interrupting
opening by 40 ft high in two sections,
capacity, 8-cycle breakers; 2 each on
each 20 ft high; 1 spare
Generators #1 and #2 main transformer
Trash gates
Top half of one crest gate consists of 3
banks and autotransformer banks; 1 each
section for operation as trash gates
on generator #3 and #4 main transformer
Traveling cranes
To 80-ton gantries, and lifting beam one
banks; 1 each on lines to Memphis and
with an auxiliary 5-ton trash hoist boom
Wilson
Maximum flood for spillway design
750,000 cfs
110-kv oil circuit
Discharge capacity, Reservoir at E1.418
650,000 cfs
breakers
4 Pacific Electric, rated 115-kv, 600-
Roadway
Provision for future construction
ampere, 1,500,000-kva interrupting
Foundation
Siliceous limestone
capacity, 8-cycle breakers; 2 each on
to Jackson and Tapelo
INTAKE
POWER STATION
Number
6 (3 bays for each of 6 units)
Dimensions of one rack opening
18.67 ft wide by 58.0 ft high
Generating capacity
Gross area at racks
3250 sq ft per unit
Present installation (4 units)
144,000 kw
Gates
2 sets of 3 each vertical, fixed-wheel
Ultimate installation provided for (6 units)
216,000 kw
gates, clear opening 18.67 ft wide by
Type of superstructure
42 ft high in 2 sections
construction
Reinforced concrete; with steel truss
Emergency gate
Bottom sections of 3 head gates
roof; generator high tension switching
used for emergency closure
and take-off structure on roof
Crane
Same 80-ton gantries used as for spillway
Principal outside dimensions
420 ft long by 176 ft
wide by 169 ft high
Control building
96.5 ft long by 52.5 ft wide by
HYDRAULIC TURBINES
45.5 ft high above intake deck
Erecting crane
One 300-ton traveling crane with 2-150-ton
Number
4 present; 6 ultimately
main hooks and 2-25-ton auxiliary hooks
Manufacturer
Allis-ChaImers Manufacturing Company
Type
Kaplan type, adjustable-blade propeller,
GENERATORS
counterclockwise rotation
Rated capacity (each)
48,000 hp at 45-ft net head
Number or units
4 present, 6 ultimately
Maximum capacity
55,000 hp at 47-ft net head
Manufacturer
Westinghouse Electric and Manufacturing Company
Efficiency (boat guaranteed)
89.0 percent at 45-ft net head
Type
A-o, vertical shaft, thrust bearings below rotors
Discharge at generator rating (43-ft head)
12,000 ofs
Rating (each)
40,000-kva, 36, 000-kw, at 60 rise
C
Normal speed
8 rpm
46,000-kva, 41,400-kw at 80 rise
C
Specific speed
163 rpm
0.9 power factor, 5-phase, 60 cycle,
Spacing of turbines center to center of unit
80.0 ft
13,800-volt, 81.8 rpm
Diameter of runner
292 in.
Efficiency (guaranteed)
97.2 at 100 percent rated kva
Vertical distance from distributor center line
Maximum continuous capacity
46,000-kva at 80
C
to draft tube floor
64.6 ft
Thrust bearing
Kingsbury type. 2,508,500 lb total load
Elevation center line of distributor
E1, 358.6
Main. 285-kw, 250-volt, direct-connected
Governor Fly-ball, motor-driven from potential transformers
Pilot. 15-kw 250-volt, direct-connected
Weight of heaviest part to be lifted by crane
625,000 lb
Weight or heaviest piece to be lifted by crane
463,000 lb
DRAFT TUBES
Type
Elbow; 3 openings with horizontal splitter
Horizontal length (center line of turbine to
downstream face)
85.0 ft
Net area at outlet opening per unit (3 openings)
1568 sq ft
Gates
2 sets to of 3 each-slide gates, (clear opening)
18 ft by 8 in. by 21 ft 11 in. high
Crane
One 30-ton gantry and lifting beam
Figure 22. Extracted power plant data.
AGO 3898A
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