William T. Thomson, Ian Culbert

Current Signature Analysis for Condition Monitoring of Cage Induction Motors

Industrial Application and Case Histories

• Gebundenes Buch

Produktbeschreibung

Provides coverage of Motor Current Signature Analysis (MCSA) for cage induction motors

This book is primarily for industrial engineers. It has 13 chapters and contains a unique data base of 50 industrial case histories on the application of MCSA to diagnose broken rotor bars or unacceptable levels of airgap eccentricity in cage induction motors with ratings from 127 kW (170 H.P.) up to 10,160 kW (13,620 H.P.). There are also unsuccessful case histories, which is another unique feature of the book. The case studies also illustrate the effects of mechanical load dynamics downstream of the motor on the interpretation of current signatures. A number of cases are presented where abnormal operation of the driven load was diagnosed. Chapter 13 presents a critical appraisal of MCSA including successes, failures and lessons learned via industrial case histories.
_ The case histories are presented in a step by step format, with predictions and outcomes supported by current spectra and photographic evidence to confirm a correct or incorrect diagnosis
_ The case histories are presented in detail so readers fully understand the diagnosis
_ The authors have 108 years of combined experience in the installation, maintenance, repair, design, manufacture, operation and condition monitoring of SCIMs
_ There are 10 questions at the end of chapters 1 to 12 and answers can be obtained via the publisher

Current Signature Analysis for Condition Monitoring of Cage Induction Motors serves as a reference for professional engineers, head electricians and technicians working with induction motors. To obtain the solutions manual for this book, please send an email to [e-mail].

William T. Thomson is Director and Consultant with EM Diagnostics Ltd, in Scotland. Prof. Thomson received a BSc (Hons) in Electrical Engineering in 1973 and an MSc in 1977 from the University of Strathclyde. He has published 72 papers on condition monitoring of induction motors in a variety of engineering journals such as IEEE Transactions (USA), IEE Proceedings (UK), and also at numerous International IEEE and IEE conferences. He is a senior member of the IEEE, a fellow of the IEE (IET) in the UK and a Chartered Professional Engineer registered in the UK.

Ian Culbert was a Rotating Machines Specialist at Iris Power Qualitrol since April 2002 until his very untimely death on 8th September, 2015. At this company he provided consulting services to customers, assisted in product development, trained sales and field service staff and reviewed stator winding partial discharge reports. He has co-authored two books on electrical machine insulation design, evaluation, aging, testing and repair and was principal author of a number of Electric Power Research Institute reports on motor repair. Ian was a Registered Professional Engineer in the Province of Ontario, Canada and a Senior Member of IEEE.

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Produktdetails

• IEEE Press Series on Power Engineering
• Verlag: Wiley & Sons / Wiley-IEEE Press
• Artikelnr. des Verlages: 1W119029590
• 1. Auflage
• Seitenzahl: 448
• Erscheinungstermin: 24. Januar 2017
• Englisch
• Abmessung: 236mm x 160mm x 28mm
• Gewicht: 748g
• ISBN-13: 9781119029595
• ISBN-10: 1119029597
• Artikelnr.: 47085078

Autorenporträt

WILLIAM T. THOMSON is Director and Consultant with EM Diagnostics Ltd, in Scotland. Prof. Thomson received a BSc (Hons) in Electrical Engineering in 1973 and an MSc in 1977 from the University of Strathclyde. He has published 72 papers on condition monitoring of induction motors in a variety of engineering journals such as IEEE Transactions (USA), IEE Proceedings (UK), and also at numerous International IEEE and IEE conferences. He is a senior member of the IEEE, a fellow of the IEE (IET) in the UK and a Chartered Professional Engineer registered in the UK. IAN CULBERT was a Rotating Machines Specialist at Iris Power Qualitrol since April 2002 until his very untimely death on 8th September, 2015. At this company he provided consulting services to customers, assisted in product development, trained sales and field service staff and reviewed stator winding partial discharge reports. He has co-authored two books on electrical machine insulation design, evaluation, aging, testing and repair and was principal author of a number of Electric Power Research Institute reports on motor repair. Ian was a Registered Professional Engineer in the Province of Ontario, Canada and a Senior Member of IEEE.

Inhaltsangabe

ABOUT THE AUTHORS xiii

OBITUARY TO IAN CULBERT xv

ACKNOWLEDGMENTS xvii

FOREWORD xix

PREFACE xxiii

NOMENCLATURE xxvii

ACRONYMS AND ABBREVIATIONS xxxiii

RELEVANT UNITS OF EQUIVALENCE USEFUL FOR THIS BOOK xxxv

CHAPTER 1 MOTOR CURRENT SIGNATURE ANALYSIS FOR INDUCTION MOTORS 1

1.0 Introduction 1

1.1 Historical Development of MCSA and Goals of This Book 4

1.2 Basic Theory of Operation of the 3-Phase Induction Motor 6

1.3 Starting and Run-Up Characteristics of SCIMs 20

1.4 Illustrations of Construction of a Large HV SCIM 29

1.5 Questions 33

References 34

CHAPTER 2 DESIGN, CONSTRUCTION, AND MANUFACTURE OF SQUIRREL CAGE ROTORS 39

2.0 Introduction 39

2.1 Aluminum and Copper Die-Cast Windings 40

2.2 Fabricated Squirrel Cage Windings 43

2.3 Design and Manufacturing Features of Squirrel Cage Rotor Windings to Minimize Failures 52

2.4 Questions 53

References 54

CHAPTER 3 CAUSES OF BREAKS IN SQUIRREL CAGE WINDINGS DURING DIRECT-ON-LINE STARTS AND STEADY-STATE OPERATION 55

3.0 Introduction 55

3.1 Mechanical Stresses and Consequential Forces on Rotor Bars and End Rings 56

3.2 Thermal Stresses in the Rotor Bars and End Rings 57

3.3 Broken Bars and End Rings Due to Combined Mechanical and Thermal Stresses When Starting High Inertia Loads 59

3.4 Rotor Bar Stresses Resulting from a Loose Slot Fit 60

3.5 Strengths and Weaknesses of Certain Bar and End Ring Shapes and Types of Joints 62

3.6 Pulsating Loads Due to Crushers and Compressors 62

3.7 Direct-On-Line Starting of Large Induction Motors Driving High Inertia Fans 63

3.8 Direct-On-Line Starting of Large Induction Motors Driving Centrifugal Pumps 66

3.9 Limitations on Repetitive Motor Starts 68

3.10 Criteria for Design of Squirrel Cage Rotor Windings 69

3.11 Samples of Breaks in Squirrel Cage Rotor Windings 72

3.12 Questions 77

References 77

Further Reading 78

CHAPTER 4 MOTOR CURRENT SIGNATURE ANALYSIS (MCSA) TO DETECT CAGE WINDING DEFECTS 79

4.0 Summary 79

4.1 Introduction 79

4.2 Derivation of Current Component at f (1 . 2s) 82

4.3 Reasons for Current Component at f (1 + 2s) 83

4.4 Spectrum Analysis of Current 85

4.5 Severity Indicators for Assessing Condition of Cage Windings at Full-Load 93

4.6 The dB Broken Bar Severity Chart 110

4.7 Influence of Number of Rotor Bars and Pole Number on the Equivalent Broken Bar Factor with Measured dB Difference Values 111

4.8 Questions 116

References 118

CHAPTER 5 MCSA INDUSTRIAL CASE HISTORIES--DIAGNOSIS OF CAGE WINDING DEFECTS IN SCIMs DRIVING STEADY LOADS 119

5.0 Introduction and Summary of Case Histories 119

5.1 Case History (2000-2014)--Summary and Key Features 120

5.2 Case History (1983)--Summary and Key Features 122

5.3 Case History (1982)--Summary and Key Features 125

5.4 Case History (2002)--Summary and Key Features 128

5.5 Case History (1985-1987)--Summary and Key Features 133

5.6 Case History (2006)--Summary and Key Features 136

5.7 MCSA Case History (2004)--Summary and Key Features 139

5.8 MCSA Case History (2004)--Summary and Key Features 141

5.9 Questions 143

References 144

CHAPTER 6 MCSA CASE HISTORIES--DIAGNOSIS OF CAGE WINDING DEFECTS IN SCIMs FITTED WITH END RING RETAINING RINGS 147

6.0 Introduction and Summary of Case Histories 147