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The Francis turbine is a type of water turbine. ... Penstock diameters are between 1 and 10 m (3.3 and 32.8 ft). The speeds of different turbine units range from 70 ...
At the powerhouse, the water feeds four turbine/generator units, consisting of two 47.5 MW Pelton-type turbines, and two 8.4 MW Francis turbines. The water from the Pelton turbines is released directly into the Sultan River, while the rest of the water is piped to Lake Chaplain.
The penstocks are 102 metres (335 ft) long and 4.6 metres (15 ft) in diameter. The water is used to turn five Vertical Francis turbines, revolving at a higher speed of 187 rpm. The generators at Maraetai II produce 36 MW each at 11,000 volts.
A fifth turbine-generator, horizontal Francis-type, originally rated at 5 MW, was added to Plant 1 in 1905. [12] In 1908 Seattle-Tacoma Power Company, a forerunner to Puget Sound Energy, purchased Seattle Electric Company. [10] A second penstock was added to Plant 2 in 1957. The penstock was supplied and installed by Chicago Bridge & Iron Co.
Water from penstocks is fed into a six 165 MW Francis turbine-generator and then discharged in the Satluj. The power house has an installed capacity of 990 megawatts (1,330,000 hp). [2] The change in elevation affords a hydraulic head of 335 m (1,099 ft). [5] [6]
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The second plant is underground and has a single 100 MW Francis turbine supplied by Andritz. However, the plant is designed to accommodate an additional 40 MW in the future. The water, which comes from the same reservoir as for the historical power plant, flows through a 370 m long intake tunnel and then drops 110 m into the penstock.
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