. Development and electrical distribution of water power . FWEHULT WESTERWIK PLANT 161 vice is provided. The rolling device consists of a cast-iron plateresting on the oak block, four- cast-iron rolls, and a cast-iron piecewhich rests on these rolls and to which the wire ropes are fastenedby screws. The terminals of the wire ropes are anchored to therock. Thus they act as a guy to the casting to which the wire ropeis fastened, and prevent it from rolling out of the cast-iron to the side is prevented by flanges on the rolls. Fourwire ropes are mounted in this way, one of which se
. Development and electrical distribution of water power . FWEHULT WESTERWIK PLANT 161 vice is provided. The rolling device consists of a cast-iron plateresting on the oak block, four- cast-iron rolls, and a cast-iron piecewhich rests on these rolls and to which the wire ropes are fastenedby screws. The terminals of the wire ropes are anchored to therock. Thus they act as a guy to the casting to which the wire ropeis fastened, and prevent it from rolling out of the cast-iron to the side is prevented by flanges on the rolls. Fourwire ropes are mounted in this way, one of which serves as stated the cross-section of each rope is 60 sq. mm. Eachwire rope has, therefore, the same conductivity as a copperwire about 7 sq. mm. in cross-section. At 300 C. the strain inthe span part of the rope is 1,300 lbs., and in the guy part 1,650 the maximum stress equals 17,800 lbs. per sq. in., corre-sponding to a safety factor of 5. The sag of the rope at 300 ft. In spite of this sag a contact between the ropes. Fig. 80.—Method of Anchoring Wire Cable Span. is impossible, since they are mounted at different heights, and thehorizontal distance of about ft. is ample. Moreover, it hasbeen proved that even in a strong wind the wires do not swing;all of the ropes are deviated to the same constant angle fromthe vertical plane whereby the distance between the ropes isnot changed. As the wire ropes are anchored to the rock it is necessary to 11 162 DEVELOPMENT AND DISTRIBUTION OF WATER POWER put special-strain insulators into the guy part of the ropes. Thestrain insulator which is shown in Fig. 80 must withstand a me-chanical force of 1,650 pounds and at the same time secure agood insulation. The insulators are coupled in series by twos;therefore, at the regular working conditions each insulator is sub-jected to a voltage of 3,000. Still, in order to get a high degreeof security, each insulator was designed for 20,000 volts. Theinsulator
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