Pole and Tower Lines for Electric Power TransmissionMcGraw-Hill, 1916 - 272 halaman |
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Istilah dan frasa umum
38 Galv aluminum angle assumed attachment bending bracing broken wires butt cable cement circuits clamps clearance coat compression members concrete poles conductors connection considerable copper corners corrosion cost creosote crossarms crossing span dead load dead-end diameter elastic limit electrical exceeding excess factor of safety failure foundation Gage Mat galvanized greater ground wire guys hard-drawn holes horizontal installation less line construction long spans main legs material maximum metal miles per hour obtained overhead paint pin insulators pole lines poles or towers power line power wires protection radius of gyration reinforcement result right-of-way Sag in Feet shear sleet specifications spelter square foot square inch standard steel poles strain insulators stranded stringing supports surface Susp thickness timber tion transmission line ultimate strength unit stress usually velocity volts weight wind loads wind pressure wood poles wooden poles
Bagian yang populer
Halaman 103 - Material which is to be used without annealing or further treatment shall be tested in the condition in which it comes from the rolls.
Halaman 187 - As soon as the stronger solution is taken from the vessel containing the unfiltered neutralized stock solution, additional crystals and water must be added to the stock solution. An excess of cupric oxide shall always be kept in the unfiltered stock solution.
Halaman 103 - Two test pieces shall be taken from each melt or blow of finished material, one for tension and one for bending; but in case either test develops flaws, or the tensile test piece breaks outside of the middle third of its gauged length, it may be discarded and another test piece substituted therefor.
Halaman 104 - The variation in cross-section or weight of more than 2\ per cent from that specified will be sufficient cause for rejection, except in the case of sheared plates, which will be covered by the following permissible variations...
Halaman 250 - The method of supporting the conductors at the poles, or towers, shall be such as to hold the wires, under maximum loading, to the supporting structures, in case of shattered insulators, or wires broken or burned at...
Halaman 253 - Conductors: The conductors shall be of copper, aluminum, or other non-corrodible material, except that in exceptionally long spans, where the required mechanical strength cannot be obtained with the above materials, galvanized or copper-covered steel strand may be used.
Halaman 187 - The presence of an excess of cupric oxide will be shown by the sediment of this reagent at the bottom of the containing vessel. The neutralized solution shall be filtered before using by passing through filter paper. The filtered solution shall have a specific gravity of 1.186 at 65° F.
Halaman 187 - ... 36 parts, by weight, of crystals to 100 parts, by weight, of water. The solution shall be neutralized by the addition of an excess of chemically pure cupric oxide (CuO). The presence of an excess of cupric oxide will be shown by the sediment of this reagent at the bottom of the containing vessel.
Halaman 187 - Solution shall not be used for more than one series of four immersions. E. Samples. Not more than seven wires shall be simultaneously immersed, and not more than one sample of galvanized material other than wire shall be immersed in the specified quantity of solution. The samples shall not be grouped or twisted together, but shall be well separated so as to permit the action of the solution to be uniform upon all immersed portions of the samples.
Halaman 251 - The pole, or towers, shall be designed to withstand, with the designated factor of safety, the combined stresses from their own weight, the wind pressure on the pole, or tower, and the above wire loading on the crossing span and the next adjoining span on each side. The wind pressure on the poles, or towers, shall be assumed at 13 Ib. per square foot on the projected area of solid or closed structures and lV2 times the projected area of latticed structures.