CONTENTS 



CHAPTER PAGE 



I. TRANSFORMERS (98 PROBLEMS) 1 



Iron loss, magnetizing current, number of turns, effective resist- 

 ance and reactance, copper loss, regulation, efficiency, auto- 

 transformer, induction regulator, parallel operation. 



II. SYNCHRONOUS GENERATORS (99 PROBLEMS) 24 



Generated electromotive force, form factor, harmonics, concen- 

 trated and distributed windings, leakage reactance, armature 

 reaction, synchronous reactance voltage, regulation-comparison 

 of methods, effect of power factor, efficiency, parallel operation, 

 hunting. 



III. SYNCHRONOUS MOTORS (50 PROBLEMS) 52 



Excitation, efficiency, power factor, maximum current, break- 

 down, effect of added resistance and reactance, transmission line 

 regulation, power factor compensation. 



IV. INDUCTION MOTORS (80 PROBLEMS) 68 



I lux distribution, exciting current, iron loss, winding pitch, 

 starting current, torque, speed regulation, breakdown torque, 

 effect of added resistance and reactance, Heyland diagram, 

 calculation of characteristics, concatenation, induction gen- 

 erator, necessary synchronous apparatus, calculation of char- 

 acteristics. 



V. ROTARY CONVERTERS (61 PROBLEMS) 93 



Voltage ratio, effect of flux distribution, relative outputs, trans- 

 former capacities, armature reaction, excitation, series field 

 turns, efficiency. 



VI POLYPHASE CIRCUITS (75 PROBLEMS) 105 



Delta and Y connection, balanced and unbalanced loads, 

 neutral current, power measurement with unbalanced loads, 

 transformer connections and relative capacities, auto-trans- 

 formers, transmission line regulation and efficiency, combined 

 < fficiency and regulation of generator, line and transformers, 

 in- lu-'t iun and synchronous motor loads. 



V I I \ON-BINUBOIDAL WAVES (44 PROBLEMS) . 126 



Phase and line voltages, two-phase to three-phase transforma- 

 tion, neutral current, power measurement, effect of inductance 

 and capacity, cyclic order of voltages, unbalanced MS- 



former connections. 



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