Electric City, WA
Grand
Coulee Dam
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| Generators G-22, G-23, G-24, are capable of producing 805 megawatts
of power and have an 11 foot diameter hollow shaft connecting the turbine
to the generator. The shaft walls are about 8" thick. The turbine
portion of the shaft weighs about 275 tons and is connected to the generator
portion of the shaft with 24 coupling bolts, each weighing about 410 pounds,
located inside the coupling. The turbine weighs about 440 tons and the
generator rotor, including the shaft weighs about 1530 tons.
Generators G-19, G-20 and G-21 are capable of producing 600 megawatts of power and have and 8 ½ foot diameter shaft connecting the turbine to the generator. The shaft walls are about 8" thick. The turbine portion of the shaft weighs about 193 tons and is connected to the generator portion of the shut with 28 coupling bolts, each weighing about 810 pounds, located outside the coupling. The turbine weighs about 500 tons and the generator rotor, including the shaft weighs about 1935 tons. G- 19, G-20, and G-21 have 2 servomotors mounted on the wall of the turbine pit, one on each side of the main shaft. The servomotors are hydraulically operated using 1,000 psi oil pressure controlled by a governor. The servomotor pistons push and pull to move the linkage to rotate the operating ring. Operated by 32 linkage arms the wicket gates (located below the headcover in the water passage area), regulate the amount of water admitted to the turbine. The volume of water controls the mechanical energy output (horsepower) of the turbine. This directly correlates to the electrical energy (megawatts) produced by the generator. |
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