File:Development and electrical distribution of water power (1908) (14763167042).jpg

Identifier: developmentelect00lynd (find matches)
Title: Development and electrical distribution of water power
Year: 1908 (1900s)
Authors: Lyndon, Lamar, 1871-
Subjects: Hydroelectric power plants
Publisher: New York, Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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cessible for repairs. In some of the later plants the power-house wall is separatedfrom the bulkhead, there being a short space between the two.The turbine casing passes through bulkhead and across the in-tervening space and through the wall of the house, ending justinside the wall or flush with it at one end, and at the inner bulk-head face on the other. Large openings are made in the casing,between the bulkhead and house wall, and through these openingsthe wheels may be inspected and repaired. They are closed upwith steel plates bolted in place. The draft tubes pass down through the supporting arches—which are extended up to the bulkhead and joined to it—and thewater is discharged below the floor passing under it, just as hasbeen before described. Fig. 25 illustrates this method of construction. The level ofthe water shows the height of the spillway portion of the dam, and,as may be seen, the bulkhead portion is much higher than the crest DESIGN OF HYDRO-ELECTRIC POWER-HOUSES 45
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46 DEVELOPMENT AND DISTRIBUTION OF WATER POWER of the dam. The turbine units, in this case, comprise two pairs ofdouble wheels coupled tandem. In many instances, the low speed of the turbines due to lowheads precludes the possibility of using low-priced dynamos ifdirect connected to the turbines, owing to their similarly low speeds.It therefore becomes necessary to drive the dynamos by beltingor rope drives from the turbines, in order to give a higher speed tothe generators than that of the turbines. In such plants it iscustomary to make the station floor considerably higher than thelevel on which the turbines rest, generally from ten to twenty feethigher, and have the belts or ropes pass diagonally upward from theturbine drive pulley to that of the dynamo. The turbines may beplaced outside or inside the house and may be in open penstocksor steel-encased. Usually in such cases, however, the water-wheelsare installed in open penstocks outside the house, and their driveshafts extend thr

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