. Development and electrical distribution of water power . & B& B& Bj^^g^ SECTION FRONT VIEW Fig. 64. line wire. One is shown in Fig. 64 which is suitable for voltagesup to 30,000 volts. Tile pipes 12 inches in diameter, and spaced 14 to 16 inchesbetween centres, are set in the walls sloping downward from in-side to outside, as shown. The slope may vary from twenty tothirty degrees to the horizontal. The wire passes from insulator A inside the station, throughthe tile pipe, to insulator B outside the station, the positions of the POLE LINE AND ACCESSORIES *33 insulators being fixed to keep the
. Development and electrical distribution of water power . & B& B& Bj^^g^ SECTION FRONT VIEW Fig. 64. line wire. One is shown in Fig. 64 which is suitable for voltagesup to 30,000 volts. Tile pipes 12 inches in diameter, and spaced 14 to 16 inchesbetween centres, are set in the walls sloping downward from in-side to outside, as shown. The slope may vary from twenty tothirty degrees to the horizontal. The wire passes from insulator A inside the station, throughthe tile pipe, to insulator B outside the station, the positions of the POLE LINE AND ACCESSORIES *33 insulators being fixed to keep the wire in the centre of the downward slope of the wire is to prevent water on the wiresfrom draining into the power station. Another excellent arrangement is that shown in Fig. 65. The roof of the power-house is extended out about four feetbeyond the wall, and a small box-like room is built below this ex-. Fig. 65. tension, as indicated. Holes in the wall—one hole for each wire,the diameter being 12 to 14 inches—allow the wires to pass fromthe interior of the station into this compartment. The floor orbottom of the compartment has holes in it so that the wires maybe turned downward and carried out through them. Two pairsof insulators or brackets serve to support and guide the directionof the wires. The compartment further serves as an enclosurefor the lightning arresters, which are installed as shown. 134 DEVELOPMENT AND DISTRIBUTION OF WATER POWER Other methods involving the use of openings covered with glassplates, each plate having a small hole in it for the wire to passthrough, have been used. There is, however, always danger ofdirt and dust collecting on the plates and providing leakage general opinion now is that a simple hole of twelve to six-teen inches diameter is the best construction. CHAPTER XI. Lightning Protection. Under the general classification lightning a
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