. Development and electrical distribution of water power . Fig. 57. and below it. Fig. 60 shows the horizontal or tension link insula-tors attached to a supporting tower, and to which the ends of thetransmission wire are fastened. The wires are in the latter casepractically dead-ended, but the line is made continuous by a loose connecting wire which joinsthe two conductors as indica-ted in the figure. The preferredpractice is to use the tension in-sulators about every mile, andsuspension insulators at the inter-mediate supporting points. Thisproduces independent sections ofwire, each one mile
. Development and electrical distribution of water power . Fig. 57. and below it. Fig. 60 shows the horizontal or tension link insula-tors attached to a supporting tower, and to which the ends of thetransmission wire are fastened. The wires are in the latter casepractically dead-ended, but the line is made continuous by a loose connecting wire which joinsthe two conductors as indica-ted in the figure. The preferredpractice is to use the tension in-sulators about every mile, andsuspension insulators at the inter-mediate supporting points. Thisproduces independent sections ofwire, each one mile in length,supported at proper intervals. With these insulators anypractical attainable voltage maybe used, as each disc is capableof carrying 25,000 volts with afactor of safety against arcing around from one face to the otherof about 2\. For higher voltages the insulators are simply placed in. Fig. 58 128 DEVELOPMENT AND DISTRIBUTION OF WATER POWER series, two being required for 50,000 volts or four for 100,000 to their great strength which enables each insulator to sup-port a load of three tons without rupture, the weight of wire
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