ef="@public@vhost@g@html@files@48134@48134-h@48134-h-1.htm.html#Page_28" class="pginternal">28 cost of copper, 29 data, 204 data from representative transmission plants, 208 expansion of aluminum and copper, 211 melting points, 200 minimum size for transmission line, 202 properties of ideal, 200 relative conductivity, 201 relative cost of, 20 relative properties for equal lengths and resistances, 204 relative strengths for given area, 203 relative weight for given conductivity, 202 relative weight of, 202 relative weights of three-phase, two-phase, and single-phase lines, 220 resistance of, 225 skin effect, 206, 233 weight per k. w., 27 Conduits, 195 radiation loss in, 198 temperature rise in, 198 Constant current regulator, 167 transformer, 167 Control equipment for d. c. and a. c. plants, 35 Copper conductors, 200 cost of, 22 vs. aluminum, 209 wire, cost of, 29 Corrosion of conductors, 211 Cross-arm braces, 258 iron, 284 location of, 257 material, 258 Cross-arms, 49, 256 Crossings, 187 Dales plant (White River), 26, 27, 28, 71, 134, 208 Dams, 62 Delta connection, 131 Depreciation, 11 Design of power-plant, 83 Dike, 60 Direct connection, 84 Discharge, static, 170 Distribution system, 158 Draught tubes, 79 Dummy bus-bars, 145 Easton (Pa.) plant, 121 Edison Co. (Los Angeles) plant, 118 Efficiency constant-current transmission, 216 curves, motor-generator set, 117 of constant-voltage transmission, cost of operation, 12, 77263, 280, 281, 294, 295, 296 Sault Ste. Marie plant, 72, 83, 85, 89, 97, 102, 104, 105, 112, 113, 117, 118, 120, 127 Scott system, 132 Series distribution, 167 machines, 41 Sewall’s Falls plant, 26, 27, 28, 155 Shawinigan Falls plant, 1, 70, 71, 107, 116, 117, 163, 164, 166, 209, 212, 213, 235, 236, 242, 245, 267, 272, 273, 280, 282, 294, 295, 296 Sheaths for cables, 194 Shunted air-gaps, 185 Skin effect, 206, 232 Snoqualmie Falls plant, 3, 4 map of transmission lines, 4 Snow, 293 Soldered joints, 206 Spacing of poles, 249 of wire, 234 Spans, long, 190, 250 strains for different lengths, 324 Sparking distances, 182 voltages, 182 Speed, peripheral, of impulse wheels, 108 peripheral of turbines, 85, 24 efficiency, 22, 24 end strain at entries, 325 entrance to buildings, 179, 261 inductance, 206 induction, 168 insulation, 34 insulators (see Insulators), 287 insulator-pins (see Pins), 270 interest, maintenance and depreciation, 22 leakage, 47, 207, 214 length of, capacity of, population supplied, 8 lightning arresters (see Lightning Arresters), 179 lightning protection, 118 long spans, 190 loss, 22, 39 losses, 215 maximum investment in, 220 method of fastening conductors to insulators, 323 operation, 311 pole spacing, 249 regulation with synchronous motors, 241 relative weights of three-phase, two-phase, and single-phase, 228 right-of-way, 246 sag in, 309 spacing of wire, 234 steel towers (see Towers), 306 switch-houses, 238 switches, fuses, and circuit-breakers, 135 take up, arrangement for, 325 total cost of, 22 total cost of operation, 23 transposition of wires, 206, 314 voltage, 21, 215 in cables, 190 regulation, 130 wind pressure, 210 long line, 221 minimum-sized wire, 202 physical limits of, 44 a. c. pole line construction, 34 d. c. pole line construction, 33 pole lines, 246 problems, 19 regulation, 155, 239 selection of circuits, 233 single vs. parallel circuits, 241 spacing of conductors, 46 submarine, |
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