. Electric traction and transmission engineering . Fig. 122. 292 TRACTION AND TRANSMISSION. Fig. 123 shows the interior of the Rainbow Station of theGreat Falls Power Company, Montana. Each of the six3500 alternators is driven by a 6000 reactionturbine with two runners, each runner being enclosedin a separate spiral casing fed by a separate 8-foot steel. Fig. 123. penstock from a balancing reservoir and discharging intoa common draft tube. (2) High-head developments require long canals or pipelines for conveying water from the intake to the powerhouse. Level canals may be constructed
. Electric traction and transmission engineering . Fig. 122. 292 TRACTION AND TRANSMISSION. Fig. 123 shows the interior of the Rainbow Station of theGreat Falls Power Company, Montana. Each of the six3500 alternators is driven by a 6000 reactionturbine with two runners, each runner being enclosedin a separate spiral casing fed by a separate 8-foot steel. Fig. 123. penstock from a balancing reservoir and discharging intoa common draft tube. (2) High-head developments require long canals or pipelines for conveying water from the intake to the powerhouse. Level canals may be constructed along the hillsideto a point above the power station, and from there thewater can be passed down to the water wheels through a HYDRAULIC STATIONS. 293 instock. It is usually cheaper, however, to use a pipele which need not be level but can follow the contour ofe land. Wood, cast-iron, or riveted wrought-iron pipe ised for such purposes. The transmission of water throughpes or canals is accompanied by a reduction in the avail-ile head, the extent of which depends upon the size of thepe or canal. This loss of head can be computed frompressions given in most books on must be made to prevent injury to penstockspipe lines which might occur when the turbine gates oriter-wheel nozzles are regulated too quickly. Automaticief valves of sufficie
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