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Electrical Transformers And Rotating Machines

ISBN: 9781401899424 | 1401899420
Edition: 2nd
Format: Paperback
Publisher: Delmar Cengage Learning
Pub. Date: 7/21/2005

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SummaryTable of Contents
Now in its Second Edition, this book is an excellent resource for electrical students and professionals who need a comprehensive explanation of theory and practical applications of electrical machines. The book includes nine experiments enabling readers to reinforce the theory discussed earlier. Students begin with a study of magnetism and magnetic induction, single-phase isolation transformers, current transformers, and autotransformers. A unit on three-phase power refreshes the student with basic three-phase connections and calculations befor... MORE
Prefaceix
Unit 1 Magnetism
1(16)
The Earth Is a Magnet
2(1)
... MORE
Permanent Magnets
3(1)
The Electron Theory of Magnetism
3(3)
Magnetic Materials
6(1)
Magnetic Lines of Force
6(2)
Electromagnetics
8(3)
Magnetic Measurement
11(2)
Magnetic Polarity
13(1)
Demagnetizing
13(2)
Magnetic Devices
15(2)
Unit 2 Magnetic Induction
17(21)
Magnetic Induction
17(3)
Moving Magnetic Fields
20(1)
Determining the Amount of Induced Voltage
20(2)
Lenz's Law
22(2)
Rise Time of Current in an Inductor
24(2)
The Exponential Curve
26(2)
Inductance
28(2)
Induced Voltage Spikes
30(8)
Unit 3 Inductance in Alternating-Current Circuits
38(20)
Inductance
39(3)
Inductive Reactance
42(5)
Schematic Symbols
47(1)
Inductors Connected in Series
47(1)
Inductors Connected in Parallel
48(1)
Voltage and Current Relationships in an Inductive Circuit
49(1)
Power in an Inductive Circuit
50(3)
Reactive Power
53(1)
Q of an Inductor
53(5)
Unit 4 Single-Phase Isolation Transformers
58(56)
Transformer Formulas
59(2)
Isolation Transformers
61(53)
Unit 5 Autotransformers
114(10)
Determining Voltage Values
115(1)
Using Transformer Formulas
116(3)
Current Relationships
119(5)
Unit 6 Current Transformers
124(10)
Clamp-On Ammeters
129(5)
Unit 7 Three-Phase Circuits
134(28)
Three-Phase Circuits
135(1)
Wye Connections
136(4)
Delta Connections
140(3)
Three-Phase Power
143(1)
Watts and VARs
143(1)
Three-Phase Circuit Calculations
144(9)
Load 3 Calculations
153(1)
Load 2 Calculations
154(1)
Load 1 Calculations
155(1)
Alternator Calculations
156(1)
Power Factor Correction
156(6)
Unit 8 Three-Phase Transformers
162(26)
Three-Phase Transformers
163(5)
Closing a Delta
168(1)
Three-Phase Transformer Calculations
169(6)
Open-Delta Connection
175(13)
Unit 9 Single-Phase Loads for Three-Phase Transformers
188(10)
Closed Delta with Center Tap
193(1)
Closed Delta without Center Tap
194(1)
Delta-Wye Connection with Neutral
194(4)
Unit 10 Transformer Installation
198(15)
Transformer Protection
198(9)
Determining Conductor Size for a Transformer
207(6)
Unit 11 Transformer Cooling
213(10)
Air-Cooled Transformers
213(4)
Liquid-Cooled Transformers
217(6)
Unit 12 Transformer Maintenance
223(14)
Safety Procedures
224(1)
Entering a Transformer Tank
224(1)
Maintenance of Small Control Transformers
225(3)
Large Control Transformers Supplying a Motor Control Center
228(1)
Small Dry-Type Transformers for Commercial and Industrial Use
228(1)
Large Industrial Dry-Type Transformers for Use in Unit Substations
229(1)
Media-Cooled Transformers
230(1)
Pad-Mounted Oil-Cooled Transformers
231(1)
Internal Inspection and Maintenance
232(1)
Insulation Testing
232(2)
Oil Testing
234(3)
Unit 13 Harmonics
237(12)
Harmonic Effects
238(3)
Circuit Breaker Problems
241(1)
Buss Ducts and Panel Problems
242(1)
Determining Harmonic Problems on Single-Phase Systems
242(3)
Determining Harmonic Problems on Three-Phase Systems
245(1)
Dealing with Harmonic Problems
245(1)
Determining Transformer Harmonic Derating Factor
246(3)
Unit 14 Direct Current Generators
249(37)
What Is a Generator?
250(10)
Armature Windings
260(1)
Brushes
261(1)
Pole Pieces
261(1)
Field Windings
261(1)
Series Generators
262(3)
Shunt Generators
265(6)
Compound Generators
271(1)
Compounding
272(3)
Countertorque
275(1)
Armature Reaction
276(2)
Setting the Neutral Plane
278(2)
Fleming's Left-Hand Generator Rule
280(1)
Paralleling Generators
281(5)
Unit 15 Direct Current Motors
286(36)
DC Motor Principles
286(4)
Shunt Motors
290(2)
Series Motors
292(2)
Compound Motors
294(2)
Terminal Identification for DC Motors
296(1)
Determining the Direction of Rotation of a DC Motor
297(3)
Speed Control
300(2)
Field Loss Relay
302(1)
Horsepower
303(3)
Brushless DC Motors
306(3)
Converters
309(1)
Permanent Magnet Motors
309(8)
Right-Hand Motor Rule
317(5)
Unit 16 Alternators
322(16)
Three-Phase Alternators
322(3)
The Rotor
325(2)
The Brushless Exciter
327(1)
Alternator Cooling
328(2)
Frequency
330(1)
Output Voltage
331(1)
Paralleling Alternators
332(2)
Sharing the Load
334(1)
Field Discharge Protection
334(4)
Unit 17 Three-Phase Motors
338(51)
Three-Phase Motors
339(1)
The Rotating Magnetic Field
339(1)
Synchronous Speed
339(4)
Connecting Dual-Voltage Three-Phase Motors
343(7)
Squirrel-Cage Induction Motors
350(14)
Three-Speed Consequent Pole Motors
364(5)
Four-Speed Consequent Pole Motors
369(1)
Wound Rotor Induction Motors
369(6)
Synchronous Motors
375(7)
Selsyn Motors
382(7)
Unit 18 Single-Phase Motors
389(47)
Single-Phase Motors
389(1)
Split-Phase Motors
390(2)
Resistance-Start Induction-Run Motors
392(7)
Capacitor-Start Induction-Run Motors
399(1)
Dual-Voltage Split-Phase Motors
400(3)
Determining Direction of Rotation for Split-Phase Motors
403(1)
Capacitor-Start Capacitor-Run Motors (Permanent-Split Capacitor Motors)
404(3)
Shaded-Pole Induction Motors
407(3)
Multispeed Motors
410(2)
Single-Phase Synchronous Motors
412(2)
Repulsion Motors
414(1)
Construction of Repulsion Motors
414(3)
Repulsion-Start Induction-Run Motors
417(3)
Repulsion-Induction Motors
420(1)
Stepping Motors
420(8)
Universal Motors
428(8)
Unit 19 Motor Maintenance and Troubleshooting
436(18)
Motor Bearings
437(1)
Direct Current Machines
437(5)
Testing Alternating Current Motors
442(1)
Testing Dual-Voltage Motors
443(11)
Unit 20 Motor Installation
454(31)
Determining Motor Current
454(6)
Determining Conductor Size for a Single Motor
460(3)
Overload Size
463(3)
Determining Locked-Rotor Current
466(1)
Short-Circuit Protection
467(3)
Starter Size
470(6)
Multiple Motor Calculation
476(9)
Laboratory Experiments
485(66)
Experiment 1 Transformer Basics
486(5)
Experiment 2 Single-Phase Transformer Calculations
491(7)
Experiment 3 Transformer Polarities
498(9)
Experiment 4 Autotransformers
507(6)
Experiment 5 Three-Phase Circuits
513(5)
Experiment 6 Three-Phase Transformers
518(17)
Experiment 7 Rotating Magnetic Field
535(2)
Experiment 8 Three-Phase Dual-Voltage Motors
537(8)
Experiment 9 Single-Phase Dual-Voltage Motors
545(6)
Appendix A Greek Alphabet551(2)
Appendix B Metals553(2)
Appendix C Full-Load Current Direct Current Motors555(1)
Appendix D Full-Load Current Alternating Current Single-Phase Motors556(1)
Appendix E Full-Load Current Alternating Current Three-Phase Motors557(2)
Appendix F NEMA Design Codes for Three-Phase Squirrel-Cage Motors559(2)
Answers to Practice Problems561(3)
Glossary564(8)
Index572

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