524 



INDEX 



Synchronous, reactance, 147 



speed of induction motors, 235 

 Synchroscope, 71 



Tangents, table of, 460 

 Tantalum filament lamps, 421 

 T-connection of transformers, 214 

 Teaser transformer, 215 

 Three-phase, current, generatoin, 



79 



delta-connection, 83 

 power-factor indicator, 71 

 power measurements, 87 

 rotating field of induction 



motor, 230, 233 

 systems, 77 

 transformer, 203 



connections, 211 

 transmission line, 377 

 calculations for, 388 

 capacitance of, 386 

 reactance of, 382 

 unsymmetrical spacing of, 387 

 winding, 106 

 Y-connection, 80 

 Three, -wattmeter method of power, 



measurement, 87 

 -wire converter, 375 



zig-zag transformer connec 



tions for, 376 

 Thury system, 377 

 Thrill regulator, 161 

 Torque of induction motor, 237 

 break-down, 245 

 effect of slip on, 238, 245 

 starting, 245 



Towers, transmission, 405 

 Transformer, 172 



ampere- turns of, 175 

 artificially cooled, 202 

 auto-, 206 



as a voltage booster, 210 

 obtaining neutral by means 



of, 210 



compensator, 209 

 connections, 211 



Transformer connections, 211 

 converters, 364 

 delta, 212 

 diametrical, 365 

 double delta, 366 

 double-Y, 365 

 open delta, 213 

 Scott, 214 

 six-phase star, 365 

 T, 214 

 V, 213 

 Y, 211 



zig-zag Y, 376 

 constant-current, 217 

 with mercury-arc rectifier, 219 

 cooling of, 199 



water, 202 

 core loss, 190 



eddy current, 189 

 hysteresis, 189 

 core- type, 195 

 current, 221 

 efficiency of, 193 

 equivalent, reactance of, 184 



resistance of, 184 

 exciting current of, 176 

 H-type, 198 

 induced electromotive force of, 



173 



instrument, 220 

 leakage, flux of, 178 



reactance, 178 

 magnetizing current of, 176 

 open-circuit test of, 189 

 potential, 221 

 principle of, 172 

 regulation of, 193 

 relation of primary and second- 

 ary currents, 177 

 shell- type, 195 

 short-circuit test, 191 

 sub-stations, 406 

 three-phase, 203 

 vector diagram, 180 



simplified diagram, 182 

 Transmission lines, 377 



capacitance of, single-phase, 

 383 



