Symmetrical Components ：The Commonwealth and International Library: Applied Electricity and Electronics Division

Publication subTitle ：The Commonwealth and International Library: Applied Electricity and Electronics Division

Author： Myatt L. J.;Hammond P.

Publisher： Elsevier Science‎

Publication year： 2014

E-ISBN: 9781483181202

P-ISBN(Paperback): 9780080129785

P-ISBN(Hardback): 9780080129785

Subject： TM727 power grid

Language： ENG

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Description

Symmetrical Components introduces the fundamental concepts involved in the method of symmetrical components. The book also demonstrate the method for analyzing simple power networks that are subjected to unbalanced fault conditions.
The text first discusses the h operator, and then proceeds to detailing symmetrical components. The next two chapters cover the properties and measurement of symmetrical components. Chapter 5 tackles the short-circuit faults on an alternating current generator, while Chapter 6 discusses the equivalents circuits for unbalanced faults. The seventh chapter talks about the sequence networks and faults on three-phase systems, while the last chapter deals with unbalanced loads.
The text will be of great use to students of electrical engineering. Professional electrical engineers and technicians will also benefit from the book.

Chapter

Front Cover

Symmetrical Components

Table of Contents

Preface

Acknowledgements

CHAPTER 1. The h Operator

1. Representation of sinusoidal quantity by a vector

2. The h operator

3. Functions of h

4. Simplification of hn

5· Simplification of (h + k)-1 and (h2 + k)-1

6. Useful functions of h

7. Symmetrical three-phase voltages

8. Positive-phase sequence

9 . Negative phase sequence

10. Zero-phase sequence

11. Star-delta impedance transformations

12. Percentage and per unit values

Exercises

CHAPTER 2. Symmetrical Components

14. Resolution into symmetrical components

15. Solution of symmetrical components

16. Sum and difference equations

17. Zero-sequence currents

18. Line-to-line voltages

19. Graphical determination of phase voltages from line voltages when zero-sequence component is absent

20. Alternative graphical method to determine zero-phase sequence voltage

21. Alternative graphical method to determine positive- and negative-phase sequence voltages from phase voltages

22. Graphical determination of positive- and negative-phase sequence voltages from line voltages

23. Unbalance factor

Exercises

CHAPTER 3. The Properties of Symmetrical Components

24. Phase sequence currents and voltages in a symmetrical network

25. Generated e.m.f. of a three-phase generator

26. Neutral current

27. Generator with neutral earthed through an impedance

28. Kirchhoff's first law

29. Kirchhofes second law

30. Star–delta transformations

31. Star–delta transformers

32. Effects of unbalanced loading on synchronous machines

33. Power due to unbalanced three-phase loads

Exercises

CHAPTER 4. The Measurement of Symmetrical Components

34. Zero-sequence voltage

35. Zero-sequence current

36. Positive- and negative-sequence voltage

37. Simultaneous measurement of positive- and negative-sequence voltage

38. Positive- and negative-sequence current without residue

39. Simultaneous measurement of positive- and negative-sequence currents without residue

40. Elimination of zero-sequence component

41. Negative-sequence bridge

42. Positive- and negative-sequence filter

43· Zero-sequence power

44. Positive-sequence power

45. Negative-sequence power

Exercises

CHAPTER 5. Short-circuit Faults on an Alternating current Generator

46. Line-to-Iine fault

47. Line-to-line fault through an impedance

48. Single line-to-earth fault

49. Single line-to-earth fault through an impedance

50. Double line-to-earth fault

51. Double line-to-earth fault through an impedance

52. Three-phase fault

53. Three-phase fault through an impedance

Exercises

CHAPTER 6. Equivalent Circuits for Unbalanced Faults

54. Line-to-line fault

55. Single line-to-earth fault

56. Double line-to-earth fault

57. Three-phase fault

Exercise

CHAPTER 7. Sequence Networks and Faults on Three-phase Systems

58. Unbalanced fault on a three-phase system

59. Positive-sequence network

60. Negative-sequence network

61. Zero-sequence network

62. Zero-sequence impedances

63. Method of fault calculation for a network

64. Use of analogues

Exercises

CHAPTER 8. Unbalanced Loads

65. Unbalanced star-connected load

66. Currents in unbalanced load

67. Voltages across the unbalanced load

68. Use of unbalanced load to determine phase sequence

Exercise

APPENDIX: Use of Matrix Notation

Bibliography

Answers to Exercises

Index

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