. Development and electrical distribution of water power . e of steel coveredwith wooden planking and corrugated steel. A 50-ton overheadcrane travels the length of the generating-room, but not over the 186 DEVELOPMENT AND DISTRIBUTION OF WATER POWER switchboard. As already stated, the plant is designed to accom-modate four main units, although only two units are atpresent installed and two exciter units. Before entering the building the penstock is divided into twoparts, each of metres ( feet) diameter, each supplying oneof the main units. In addition to thes
. Development and electrical distribution of water power . e of steel coveredwith wooden planking and corrugated steel. A 50-ton overheadcrane travels the length of the generating-room, but not over the 186 DEVELOPMENT AND DISTRIBUTION OF WATER POWER switchboard. As already stated, the plant is designed to accom-modate four main units, although only two units are atpresent installed and two exciter units. Before entering the building the penstock is divided into twoparts, each of metres ( feet) diameter, each supplying oneof the main units. In addition to these there is anotherthird branch 1 metre ( feet) in diameter supplying the ex-citer units. Each of the main pipes is equipped with a butterflyvalve. To operate these butterfly valves electric motors are in-stalled in the pump-room, while the valve of the exciter penstockis operated by hand. The main turbines are built on the double-wheel Francis type, making, with a head of metres () and 214 , 900 effective Each turbine unit is. Fig. 95.—Longitudinal Section of Power-house. provided with a flywheel. Between the turbine and flywheels isa clutch coupling. Each turbine is well provided with hydraulicgoverning devices. For switching the turbines in multiple theoperation of the governor is controlled from the switchboard byan electric motor mounted on the side of the governor. DRAMMEN PLANT 187 The pressure water needed for the governor is supplied by electrically operated pumps installed in the above-men-tioned pump-room together with the necessary accumulator. The exciters are also driven by Francis turbines, but of thesingle-wheel type. These turbines are also equipped with fly-
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