354 



INDEX. 



Inductance, calculation by three- 

 voltmeter method, 117 

 calculation by wattmeter method 



116 



Induction generator, 62 

 test of, 295-303 

 circle diagram for, 296, 300 

 excitation of, 297, 301 

 uses of, 297 



Induction regulators, 250-256, 324 

 Induction motors, 257-277 

 " added " current in, 283 

 " added " losses in, 283 

 as frequency changer, 293 

 as potential regulator and phase 



shifter, 252 

 auto-transformers for starting, 



261 



best frequency for, 64 

 cascade operation of, 277 

 circle diagram for, 278-290 

 compensator for starting, 266 

 condensers for starting, 267 

 copper losses in, 272 

 equivalent single-phase resistance 



of, 271 



graphical construction for effi- 

 ciency of, 287 

 graphical construction for power 



factor of, 286 

 graphical construction for slip of, 



285, 286 



leakage coefficient of, 290 

 leakage factor of, 290 

 leakage reactance of, 289 

 multispeed, 276 



output, measurement of, 269, 270 

 phase splitters for starting single- 

 phase, 264, 266 



predetermination of characteris- 

 tics of, 278-290 

 primary winding of, 259 

 resistance measurements of, 271 

 rotating field, 258 

 rotor of, 257 

 secondary losses in, 274 

 secondary resistance of, 289 

 secondary resistance for starting, 



262, 265 



separation of losses in, 284 

 shading coils for starting single- 

 phase, 263 



single-phase, 266, 276 

 slip of, 62, 259, 274 

 speed of, 259 



speed control by secondary resis- 

 tance, 277 



Induction motors, speed control by 



varying frequency, 277 

 speed control by vanying poles, 



277 



squirrel cage secondary, 260 

 starting as repulsion motor, 263 

 starting compensator for, 261 

 starting polyphase, 261 

 starting single-phase, 262 

 starting torque of, 260 

 stator of, 257 

 structure of, 257 

 phase-wound secondary, 260 

 tandem operation of, 277 

 torque of, 274, 285 

 torque maximum of, 260 

 variable speed, 276 

 Inductor generator, i, 62, 63 

 Insulation tests, of transformers, 177 

 Internal revolving field alternators, 63 

 Internal shunt characteristic, see 



Characteristics 

 Interpole motor, 33 

 Inverted converter, 322, 329 

 Iron, aging of, in transformers, 130 



Kapp, G., on motor testing, 50, 56 

 Karapetoff, V., on heat runs of trans- 

 formers, 178 

 on motor testing, 56 

 on alternator regulation, 100 

 Kelley and Spoehrer, on variation of 



transformer core loss, 175 

 Kennelly, A. E., on temperature co- 

 efficient of copper, ii 

 on wave analysis, 339 

 Kintner, S. M., on wave analysis, 



339 

 Kirchhoff's law, 200 



Lamps for synchronizing, 310, 313 

 Langsdorf, A. S., on wave analysis,. 



339 



Lap winding, 3 

 Leakage coefficient, 290, 346 

 Leakage factor, 290 

 Leakage reactance, 129, 163, 289 

 Lincoln, P. M, on wave analysis, 



339 



Line current of 3-phase system, 205 

 Line drop in polyphase system, 202- 



204 



Line of commutation, 6 

 Line voltage of 3-phase system, 204 

 Lloyd, M. G., on iron losses, 176 

 Load losses, defined, 46, 72 

 in transformers, 161 



