. 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 . s oil at pressures varying from 200 lb. to 300lb. per sq. in. A pressure relay in the oil system controls the automaticstarter of the motor-driven oil pump. The turbine governors are all sup-pHed with oil at 160-lb. pressure from a central oil pressure system. Thetwo 25 cycle, 220 volt, 40-hp. motors driving this apparatus are automa-tically started and stopped by the pressure variations of the system. Two
. 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 . s oil at pressures varying from 200 lb. to 300lb. per sq. in. A pressure relay in the oil system controls the automaticstarter of the motor-driven oil pump. The turbine governors are all sup-pHed with oil at 160-lb. pressure from a central oil pressure system. Thetwo 25 cycle, 220 volt, 40-hp. motors driving this apparatus are automa-tically started and stopped by the pressure variations of the system. Twomotor-driven pumps supply water at a pressure of 40 lb. to the transformersand generator bearings and for other general purposes. Exciters.—The exciter equipment is divided into three units, one of whichis a 125 kw., 125 volt, machine driven by a vertical water wheel of thesame type as the larger units. This exciter is used only when the watersupply is plentiful. The other two units are driven by 25 cycle, 2300 voltinduction motors and are capable of producing 125 kw. and 75 kw. respec-tively. All of the exciters are wired so that they may be switched to a 98 HYDROELECTRIC PRACTICE. LOW, MEDIUM AND HIGH HEAD DEVELOPMENTS 99 common bus from which energy is distributed to the field windings of thealternators. A 40-ton crane serves all portions of the generating room. For stepping up the voltage as the energy leaves the station five three-phase, 1,000 kva., 2300/34,600 volt, 25 cycle, composite-type transformershave been installed. These water-cooled units have both their primaryand secondary windings connected in delta. Each of the main groups oftransformers feeding the transmission line is protected on the transmission-
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkmcgrawhillb
