Overhead Electric Power Transmission Principles And Calculations
Overhead Electric Power Transmission Principles And Calculations
Alfred Still
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79. Concrete pole of hollow section. TRANSMISSION LINE SUPPORTS 217 neither is it likely that one particular design will ever be found suitable for all countries, climates and voltages. Any kind of supporting structure which will economically fulfil the necessary requirements will answer the purpose of the transmission line en- gineer, who merely requires a durable mechanical structure to carry a variable number of insulators at a height above ground, and with a spacing between them, depending ...upon the voltage of transmission and the length of span. As a substitute for wood poles, steel tubes have been used, either in one piece, or built up of a number of pieces of different sizes in order to economize material and give a large diameter at the bottom where the bending moment is greatest, and a small diameter at the top where the bending moment is negligible. Steel poles of considerable height, suitable for longer spans, may be built up of three or four verical tubes of comparatively small diameter jointed and braced together at suitable intervals to give stiffness to the structure.
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