. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 57 6,000 hp. single-runner Francis type water wheels, each driving a 13,200volt, 60 cycle, three-phase 4000 kw. generator at 116 r. p. m. There arealso two vertical shaft, 430 hp. water wheel-driven exciters running at400 r. p. m. The rotating part of each unit is carried on a roller thrustbearing on top of the generator. Each of the main turbines requires about1,200
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 57 6,000 hp. single-runner Francis type water wheels, each driving a 13,200volt, 60 cycle, three-phase 4000 kw. generator at 116 r. p. m. There arealso two vertical shaft, 430 hp. water wheel-driven exciters running at400 r. p. m. The rotating part of each unit is carried on a roller thrustbearing on top of the generator. Each of the main turbines requires about1,200 cu. ft. of water per second at full load. The tailrace is 12 ft. deep,90 ft. wide and about 350 ft. long, excavated in sohd rock. The electrical control equipment of this plant is restricted to that as-sociated mth the generators only and the 13,200 volt buses. All the highvoltage and transforming apparatus is installed in a step-up station locatedabout midway of the 13,200 volt hnes, connecting it with several othergenerating Intake13x 21 PLAN Draft Tube Opeaing- , 15 X 24 Elliptical CROSS SECTION OF POWER HOUSE SECTION OF WEIR Fig. 32.—Details of Weir and Arrangements to Test 6000 Hp. Turbines in No. 2 Stationof Appalachian Power Company on New River Water Wheel Tests.—This development is of special interest because ofthe excellent efficiency of its turbines. The maximum efficiency undertest of per cent, is the highest of any turbine yet built. The specificspeed (ft. lb. units, see page 27) at normal rating was 300. Such a highefficiency would be remarkable for a turbine of any type, but it is moreso considering the high specific speed. The design of the draft tubeis particularly important, and its cross-section was kept circular or ellip-tical at the outlet. Considerable care was taken in laying the concrete to keepthe walls of the intake chamber and the draft tube as smooth as possible. Thesingle draft tube saves the excessive losses usually fo
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