低压电工考证培训教程

Chapter 1　Safety Production Instructions for Electricians 001
1.1　Laws and regulations on safety production 002
1.1.1　Regulations on Management of Safety Technology Training and Assessment for Special Operation Personnel 002
1.1.2　The Production Safety Law of the People′s Republic of China 003
1.1.3　Other laws and regulations 006
1.2　Safety protection and electric shock prevention measures 008
1.2.1　Organizational measures to ensure the safety of electricians 008
1.2.2　Technical measures to prevent electric shock 011
1.3　Electrical accident and first aid for electric shock 019
1.3.1　Harm of electric current to human body 019
1.3.2　Causes and types of electric shock 021
1.3.3　Electric shock mode 022
1.3.4　Electrical accident 024
1.3.5　First aid operation for electric shock 025
1.4　Electrical fire protection, explosion-proof, lightning protection and anti-static 029
1.4.1　Electrical fire and explosion prevention 029
1.4.2　Electrical lightning protection and anti-static 032

Chapter 2　Basic knowledge of electrical safety technology 035
2.1　Basic knowledge of direct current (DC) circuit 036
2.1.1　Circuit and its basic physical quantities 036
2.1.2　Ohm′s Law 039
2.1.3　Series and parallel connection of resistance 040
2.1.4　Kirchhoff′s Law and its application 042
2.1.5　Series and parallel connection of capacitors 043
2.2　Basic electromagnetic knowledge 044
2.2.1　Magnetic field of current 044
2.2.2　Basic physical quantity of magnetic field 046
2.2.3　Left-hand rule 047
2.2.4　Electromagnetic induction phenomenon and Lenz′s Law 048
2.2.5　Self-inductance and mutual inductance 050
2.3　Fundamentals of alternating current (AC) 051
2.3.1　Single phase sinusoidal AC 051
2.3.2　Three phase AC 054
2.4　Fundamentals of electronic technology 061
2.4.1　Crystal diode and rectifier circuit 061
2.4.2　Crystal triode and its amplification circuit. 066
2.4.3　Voltage stabilizing circuit 070

Chapter 3　Electrical tools and safety signs 073
3.1　Use of electrical tools and safety tools 074
3.1.1　Use of common electrical tools 074
3.1.2　Use of other electrical tools 077
3.1.3　Use of manual electric tools 080
3.1.4　Use of electrical safety appliances 082
3.2　Use of common electrical instruments 083
3.2.1　Use of multimeter 083
3.2.2　Use of clamp ammeter 094
3.2.3　Use of insulation resistance meter 097
3.2.4　Use of electric energy meter 100
3.2.5　Use of ammeter 102
3.2.6　Use of voltmeter 104
3.3　Electrical safety signs 105
3.3.1　Electrical safety color 105
3.3.2　Electrical safety sign board 106

Chapter 4　Low-voltage electrical apparatus 109
4.1　Basic knowledge of low-voltage apparatus 110
4.1.1　Classification of low-voltage apparatus 110
4.1.2　Common terms of low-voltage apparatus 113
4.1.3　Selection and installation of low-voltage electrical apparatus 114
4.2　 Low-voltage circuit breaker and leakage protector 116
4.2.1　Low-voltage circuit breaker 116
4.2.2　Leakage protector 118
4.3　Contactor and Relay 119
4.3.1　Contactor 119
4.3.2　Relay 122
4.4　Fuse and master switch 128
4.4.1　Fuse 128
4.4.2　Master switch 130

Chapter 5　Asynchronous motor 133
5.1　Basic knowledge of asynchronous motor 134
5.1.1　Brief introduction to motor 134
5.1.2　Structure and principle of asynchronous motor 138
5.1.3　Characteristics of asynchronous motor 142
5.2　Starting and running of asynchronous motor 145
5.2.1　Starting of asynchronous motor 145
5.2.2　Running of asynchronous motor 150
5.3　Fault inspection and maintenance of asynchronous motor 152
5.3.1　Fault inspection and maintenance of three phase cage asynchronous motor 153
5.3.2　Fault inspection and maintenance of three phase wound asynchronous motor 157

Chapter 6　Electrical line 159
6.1　Types and characteristics of electrical line 160
6.1.1　Overhead line 160
6.1.2　Cable line 163
6.1.3　Indoor line 165
6.2　Safety of electrical lines 165
6.2.1　Conductivity 165
6.2.2　Mechanical strength 166
6.2.3　Spacing 167
6.2.4　Identification and connection of conducting wires 168
6.2.5　Line protection 175
6.2.6　Line management 176

Chapter 7　Electrical lighting 179
7.1　Electrical lighting mode and type 180
7.1.1　Modes of electric lighting 180
7.1.2　Types of electrical lighting 182
7.2　Installation and maintenance of lighting equipment 183
7.2.1　Installation of lighting equipment 183
7.2.2　Lighting circuit trouble shooting 189

Chapter 8　Power capacitor 195
8.1　Brief introduction to power capacitor 196
8.1.1　Classification and application of power capacitors 196
8.1.2　Structure and compensation principles of power capacitor 197
8.2　Installation requirements and wiring of power capacitor 198
8.2.1　Installation requirements of power capacitor 198
8.2.2　Wiring of power capacitor 200
8.3　Safe operation of power capacitor 202
8.3.1　Operation and maintenance of capacitor 202
8.3.2　Trouble shooting of capacitors 203

Chapter 9　Use of safety tools (K1) 205
9.1　Safe use of electrical instruments (K11) 206
9.2　Use of electrical safety appliances (K12) 219
9.3　Identify electrical safety signs (K13) 223

Chapter 10　Safe operating technology (K2) 227
10.1　Practical examination platform and examination instructions 228
10.1.1　Cognition of practical examination platform 228
10.1.2　Instruction to practical examination 232
10.2　Simulation equipment examination training project 234
10.2.1　Wiring and safe operation of electric drive circuit 234
10.2.2　Wiring and safe operation of lighting circuit 244
10.3　Equipment examination training project 255
10.3.1　Wiring and safe operation of electric drive circuit 255
10.3.2　Wiring and safe operation of lighting circuit 267

Chapter 11　Elimination of potential safety hazards at the operation site (K3) 275

Chapter 12　Emergency response at operation site (K4) 287
12.1　Emergency response and first aid for electric shock 288
12.2　Fire extinguishing simulation with fire extinguisher 294

Appendix 1　Single choice question bank 299

Appendix 2　Judgment question bank 349

References 405