356 



INDEX. 



Polygon method of representing al- 

 ternating currents, 207, 216 

 Percentage of saturation, 16 

 Phase shifters, induction regulators 



as, 254 



Polyphase currents, 196221, 222240 

 Polyphase generators, 70 

 Polyphase systems, 196-241 



addition of currents in, 201 

 addition of electromotive forces 



in, 199 



copper economy of, 220 

 current and voltage per phase in, 



212 



equivalent single-phase quanti- 

 ties in, 211 

 harmonics in, 217 

 line drop in, 202 

 mesh method of representing 



A. C. quantities in, 216 

 methods of connecting, 196 

 polygon method of representing 



A. C. quantities in, 207 

 power factor of, 223 

 radial method of representing 



A. C. quantities in, 216 

 6-phase systems, 210 

 uniform flow of power in, 241 

 Polyphase transformation, 241-249 

 Polyphase wattmeter, 229 

 Porter, on radial method of repre- 

 senting alternating current quanti- 

 ties, 216 

 Potential regulators, 250-256 



use of induction motors as, 252 

 induction regulators, 251 

 magnetic shunt, 252 

 polyphase, 255 

 single-phase, 252 

 step-by-step type, 251 

 use as transformers, 252 

 Potier, on motor testing, 56 

 Power, definition of, 116 



in a non-inductive resistance, 113 

 in an inductive circuit, 113 

 measurement by three-ammeter 



method, 118 

 measurement by three-voltmeter 



method, 118 

 measurement of, in polyphase 



systems, 222-240 

 n wattmeter method of measur- 

 ing, 228 



n-i wattmeter method of meas- 

 uring, 226 



one wattmeter method of meas- 

 uring 3-phase power, 233 



Power, proof of wattmeter methods 



of measuring power, 240 

 three-phase, 205, 206 

 two wattmeter method for any 



3-wire system, 228 

 Power current, 115 

 Power factor, 103, 104, 114 

 by sine method, 237 

 by tangent method, 237 

 for equivalent sine waves, 105 

 for non-sine waves, 226 

 polyphase, 223, 225, 232, 237 

 Predetermination, of alternator char- 

 acteristics, 73-101 

 Problems, 345 

 Prony brake, 41, 266, 268 

 Puffer, testing of motors by opposi- 

 tion method, 56 



Quadrature relation of current and 



electromotive force, 106 

 Quarter-phase 2-phase system, 196 



Radial method of representing alter- 

 nating currents and electromotive 

 forces, 216 

 Reactance, 103, 115 



effect of frequency on, 121, 122 



by impedance method, 116 



of a circuit containing inductance 



and capacity, 121 

 of a series circuit, 109 

 by three-voltmeter method, 117 

 by wattmeter method, 116 

 Reactance drop, in polyphase sys- 

 tems, 203 



in transformers, 129 

 in alternators, 67, 74, 80-96 

 Reactance method of testing alterna- 

 tors, see Electromotive force 

 method 



Reactive factor, 114 

 Rectifiers, 322 



Regulation, Institute rule on compu- 

 tation of, 93 

 of alternators, 66, 67, 69, 71, 73. 



82-84, 87, 99-100 

 of generators, 19, 22 

 of motors, 32 

 of transformers, 167, 193 

 of transmission lines, 101 

 Reist and Maxwell, on multispeed in- 

 duction motors, 277 

 Reluctance, 2 

 Repulsion motor, 263 

 Residual magnetism, effect on picking 

 up of series machine, 8 



