. 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 . t was per cent. The highestefficiency for this unit was per cent, at about gate opening and16,875 hp. The efficiency of unit No. 4 at 80 per cent, of its maximum out-put was per cent. The highest efficiency for this unit was percent, at approximately gate opening and 16,900 hp. The load on the generators was obtained by means of two three-phase,star-connected, 63,500 volt wat
. 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 . t was per cent. The highestefficiency for this unit was per cent, at about gate opening and16,875 hp. The efficiency of unit No. 4 at 80 per cent, of its maximum out-put was per cent. The highest efficiency for this unit was percent, at approximately gate opening and 16,900 hp. The load on the generators was obtained by means of two three-phase,star-connected, 63,500 volt water rheostats connected on the primary sideof the station step-up transformers, giving approximately equal loads onthe three phases at approximately unity power-factor. The output of thegenerators was measured by means of a standard indicating wattmeterconnected to instrument transformers which were connected to the gener-ator terminals. The current and two potential transformers were connectedin open delta on the secondaries and connected to the coils of the indicatingwattmeter to measure the total output. In addition to the indicating watt- LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 105. ferCent Gate Opening Fig. 61.—Curves Showing Average Power and Efficiencyon which Bonus for Water Wheels in Tallulah Falls Stationwas Accepted and Paid meter, a standard watt-hour meter, an indicating ammeter and voltmeterwere used. The ammeter and voltmeter were transferred to all the threephases for three-phase readings. Calculating Effi-ciencies of Gener-ators and Exciters.—The efficiencies of theexciters for the vari-ous outputs weretaken from a large-sized efficiency curve,which had been plot-ted from data ob-tained from the shoptests of the machinebuilders. The exciteroutputs were dividedby the efficienciestaken from the curve in order to obtain the exciter input. Efficiency curves for the generators wereplotted from shop-test data of each machine, and the efficiencies obtainedfrom these
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