Live-Line Operation and Maintenance of Power Distribution Networks

Excellent reference outlining the technical basis and working principles of live-line working, with current application technology, tools and working methods

• Introduces live-line working technology for the operation and maintenance of medium and low voltage power distribution networks, covering both the methods and techniques of live-line working on distribution networks with O&M field practices and experiences

• Elaborates the technical basis and working principles of live-line working in detail, with current application technology, tools and working methods

• Combining theory and practice closely, it provides technical guidance and helpful references to technical personnel who are engaged in distribution operation management, as well as related academics and researchers

• Written by a team of authors with extensive experience in both industry and academic fields, providing first-hand testimony of the issues facing electricity distribution companies, and offering sound theoretical foundations and rich field experiences

Klappentext

This book examines the methods and techniques of live-line working on distribution networks, which are closely combined with field practices and management experiences. A range of detailed field working illustrations, plus panoramic field graphics, are provided to help readers understand and address practical engineering challenges.

• Introduces live-line working technology for the operation and maintenance of medium and low voltage power distribution networks, covering methods and techniques of live-line working on distribution networks with O&M field practices and experiences
• Elaborates the technical basis and working principles of live-line working in detail, with current application technology, tools and working methods
• Combining theory and practice closely, it provides technical guidance and helpful references to technical personnel who are engaged in distribution operation management, as well as related academics and researchers
• Written by a team of authors with extensive experience in both industry and academic fields, providing first-hand testimony of the issues facing electricity distribution companies, and offering sound theoretical foundations and rich field experiences

This useful reference is written with power engineers in mind; graduate students of electrical engineering and industry professionals will also benefit from this comprehensive text.

Inhalt
Foreword xi

Preface xiii

Introduction 1

1 Overview 3

1.1 Basic Concept of Non?]Service Interruption Working 3

1.1.1 Basic Method of Live Line Working 4

1.1.2 Bypass Working and Mobile Power Working 6

1.2 Development of Working Techniques 8

1.2.1 Development History of Live Line Working 8

1.2.2 From Live Line Working to Live Line Working Robot 10

1.2.3 Live Line Working by Helicopter 12

1.2.4 Development From Live Line Working to Non?]Service Interruption Working 15

1.3 Power Supply Reliability and Power Outage Losses 15

1.3.1 Reliability Indexes 16

1.3.2 Analysis of Indexes of Power Supply Reliability 17

1.3.3 Power Outage Losses 20

1.4 Analysis of Effect of Working Techniques 23

References 26

2 Distribution Grid and Its Working Techniques 27

2.1 Basic Concept of Distribution Grid 27

2.2 Basic Configuration of Distribution Grid 31

2.2.1 Distribution Network Configuration 31

2.2.2 Composition of Overhead Distribution Lines 34

2.2.3 Composition of Distribution Cable Line 50

2.2.4 Other Common Distribution Equipment 54

2.3 Technical Principles of Distribution Non?]Service Interruption Working 63

2.3.1 Earth Potential Working 65

2.3.2 Middle Potential Working 67

2.3.3 Equipotential Working 69

2.4 Types of Distribution Line Poles and Live Line Working 70

2.4.1 Classification of Pole Types 70

2.4.2 Conductor Spacing in Tower and Spacing Between Conductors and Surroundings 72

2.4.3 Types of Poles Suitable for Live Line Working 75

References 77

3 Theoretical Basis of Working Techniques 79

3.1 Analysis of Influence of Electricity on Human Bodies 79

3.1.1 Influence Brought by Current on Human Bodies 79

3.1.2 Influence of Electric Field on Human Bodies 81

3.2 Overvoltage During Working 84

3.2.1 Switching Overvoltage 85

3.2.2 Temporary Overvoltage 86

3.3 Dielectric Properties 89

3.3.1 Conductance and Insulation Resistance of Dielectric 89

3.3.2 Breakdown Strength and Discharge Characteristic of Dielectric 94

3.4 Insulation Coordination and Safety Spacing 101

3.4.1 Insulation Coordination 101

3.4.2 Safety Spacing 107

References 110

4 Common Working Tools and Usages 111

4.1 Insulating Tools 111

4.1.1 Common Insulating Materials 111

4.1.2 Insulating Poles 114

4.1.3 Insulating Ropes and Cords 118

4.2 Protective Appliances 122

4.2.1 Insulating Shielding Appliances 123

4.2.2 Insulating Blanket (Mat) 125

4.2.3 Insulating Protective Appliances 126

4.3 Other Working Tools 131

4.3.1 Tensioner 131

4.3.2 Insulating Tape Lever Hoist 132

4.3.3 Instruments and Meters 133

4.4 The Making of Working Tools 139

4.4.1 Material Selection 139

4.4.2 Design and Processing 141

4.4.3 Simulation Drill and Practical Application 144

4.5 The Usage and Management of Working Tools 146

4.5.1 Storage and Maintenance of Live Line Working Tools 146

4.5.2 Warehouse of Live Line Working Tools and Management 147

4.5.3 Modern Identifications and Intelligent Management of Tools 160

References 161

5 Test Techniques for Working Tools 163

5.1 Test Items 163

5.1.1 Classification of Tests 163

5.1.2 Test Items 164

5.1.3 Technical Standards of Tests 166

5.2 Test of Common Insulating Tools 169

5.2.1 Test of Insulating Pole 169

5.2.2 Test of Insulating Tackle 177

5.2.3 Test of Insulating Hard Ladder 178

5.2.4 Test of Insulating Rope 180

5.2.5 Test of Insulating Hand Tool 184

5.2.6 Test of Insulating Shielding Cover 187 5.2.7 Test of Ins...