Preface to 1

List of commonly used characters in this book 1. 1 Basic concepts of power system 1.

1.2 Types of power plants and substations 5

1.3 voltage and power quality of power system 10

1.4 neutral point operation mode of power system 16

Chapter 20 Overview

Thinking and Exercise 2 1 2. 1 Power Load and Load Curve 22

2.2 Determination of Calculation Load 26

2.3 Calculation of Power Loss and Electric Energy Loss 34

2.4 Determination of Enterprise Computing Load 36

2.5 Reactive Power Compensation 39

2.6 Calculation of peak current 46

Chapter 47 Overview

Thinking and exercise 47 3. 1 Connection mode of power network 49

3.2 Power system component parameters and equivalent circuit 53

3.3 grid voltage calculation 62

3.4 Selection of Conductor Section of Transmission Line 66

Abstract of this chapter 7 1

Thinking questions and exercises 7 1 4. 1 Basic concept of short circuit 73

4.2 Standard System 74

4.3 Calculation of Three-phase Short-circuit Current of Infinite Capacity System 77

4.4 Actual Calculation of Three-phase Short-circuit Current in Limited Capacity System 83

4.5 Analysis and Calculation of Asymmetric Faults 88

4.6 Influence of motor on short-circuit current 96

4.7 Calculation of short-circuit current of low-voltage power grid 97

4.8 Influence of short-circuit current 99

Summary of this chapter 106

Thinking and exercises 107 5. 1 overview of electrical equipment 109

5.2 High and Low Voltage Switchgear 109

5.3 High and Low Voltage Protection Appliances and Current Limiting Appliances 122

5.4 Power Transformer 129

5.5 transformer 133

5.6 Complete sets of high and low voltage distribution equipment 142

5.7 main electrical wiring 145

5.8 Selection of Electrical Equipment 153

5.9 163 General Layout of Substation

Summary of this chapter 166

Thinking questions and exercises 167 6. 1 Basic knowledge of relay protection 168

6.2 General protection relay 170

6.3 Current and Voltage Protection of Line 176

6.4 Power Grid Direction Current Protection 188

6.5 Grounding Protection of Transmission Line 194

6.6 Introduction to Distance Protection 20 1

6.7 Protection of Power Transformer 204

6.8 Motor protection 2 18

6.9 Protection of Power Capacitors 222

6. 10 Microcomputer Protection Brief Introduction 224

Chapter 233 Summary

Thinking and Exercise 234 Chapter 8 Distribution Network Automation 268

Chapter IX Lightning Protection, Grounding and Electrical Safety 297

Chapter 10 Electrical Design of Power Engineering 3 16 References 364

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