Detailed Technical Specifications

Reprinted Courtesy of Churchill Falls (Labrador) Corpororation
Compiled by Peter Green - IEEE

 
.
Churchill Falls Project Area (Churchill Fall (Labrador) Corporation Limited)

 

RATED CAPACITY
Original 5,225,000 kw
Uprated (1985) 5,428,500 kw
GENERATING UNITS
Number of Turbines 11  
Type Francis  
Rated Capacity (Original) 648,000 HP
Rated Capacity (Uprated) 680,000 HP
Rated Net Head 312.4 m (1,025 ft)
Synchronous Speed 200 r.p.m
Scroll Case Inlet Diameter 4.48 m (14.7 ft)
Runner Inlet Diameter 5.82 m (19.1 ft)
Runner Weight 77.13 t 170,000 lb
Long Term Plant Mean Flow 1387.52 m3/s (49,000 ft3/sec)
GENERATORS
Rated Voltage 15 kv
Rated Capacity 526,315 kva (7 units)
  500,000 kva (3 units)
  530,000 kva (1 unit)
Rated Power Factor 0.95  
Rotor Diameter 9.11 m (29.9 ft)
Rotor Weight 576 t (1,270,000 lb)
StatorCoreDepth 2.99 m (9.8 ft)
PENSTOCKS
Number 11  
Length 426.72 m (1,400 ft)
Diameter - Concrete Lined Section 6.10 m (20 ft)
Diameter- Steel Lined Section 4.48 m (14.7 ft)
MACHINE HALL
Length 296.27 m (972 ft)
Width 24.70 m (81 ft)
Height 46.94 m (154 ft)
Overhead Travelling 2 X 400 t
SURGE CHAMBER
Length 232.56 m (763 ft)
BoflomWioth 12.19 m (40 ft)
Top Width 19.5 m (64 ft)
Height 45.11 m (148 ft)
VENT SHAFT
Diameter 6.10 m (20 ft)
Depth 252.68 m (829 ft)
TAILRACE TUNNELS (Unlined)
Number 2  
Width 13.71 m (45 ft)
Height 18.29 m (60 ft)
Length 1691.64 m (5,500 ft)
TRANSFORMER GALLERY
Transformers 11 (5,500 mva)
Voltage 14.75/240 kv
Length 260.91 m (856 ft)
Width 15.24 m (50 ft)
Height 11.89 m (39 ft)
CABLE SHAFTS
Cables (oil filled) 10.07 km
Voltage 240 kv
Number 6  
Diameter 2.13 m (7 ft)
Depth 263.65 m (865 ft)
SWITCHYARD
715/236 kv Transformers 18 (6,000 mva)
230/138 kv Transformers 2 (84 mva)
735 kv - 55 mva Reactors 9 (495 mva)
735 kv Circuit Breakers 12  
230 kv Circuit Breakers 16  
TRANSMISSION
735 kv Lines 3 @ 608 km (378 mi)
230 kv Lines 2 @ 463 km (288 mi)
138 kv Lines 1 @ 267 km (166 mi)
66 kv Lines 200 km (124 mi)
RESERVOIRS
Smallwood
Maximum Normal Water Level 473 m (1,551 ft)
Minimum Water Level 464 m (1,522 ft)
Reservoir Area 5698 km2 (2,200 mi2)
Active Storage 28.97 x 109 m3 (1022 x 109 ft3)
Ossokmanuan 
Maximum Normal Water Level 479 m (1,572 ft)
Active Storage 2.84 x 109 m3 (100.1 x 109 ft3)
East and West Forebay 
Active Storage 0.864 x 109 m3 (30.5 x 109 ft3)
DYKES
Total Number 88  
Total Volume of Material 20,000,000 m3 (26,000,000 cyd)
Average Height 9 m (30 ft)
Maximum Height (Forebay Area) 36 m (117 ft)
Largest in Volume (Forebay Area) 1,950,000 m3 (2,551,000 cyd)
Longest (Sail Lake Area) 6041 m (19,813 ft)
Total Crest Length 64.4 km (40 mi)
CLIMATE
Average Annual Precipitation 765 mm (30.1 in)
Temperature Range -48 C to 30 C (-55 F to 87 F)
Temperature Average Annual -4 C (25 F)

 

.
Cross Section Turbine Generator (Churchill Fall (Labrador) Corporation Limited)

.
Cross Section Powerhouse (Churchill Fall (Labrador) Corporation Limited)