在线一本码道高清

Position: Home > Books and Manuals > Data Download > Electricity and Electricity > Electrician Circuit Quick Check Standing Manual

Electrical circuit quick check standing manual

Bookmark this page
  • Data size: 51.45 MB
  • Data language: Chinese version
  • Document format: PDF document
  • Data category: Electric Power
This site recommends:
Related Information:
Related instructions:
  • basic introduction
Electrician circuit quick check standing manualPublished time: 2017
Introduction This book consists of 16 chapters, including basic motor control circuits, common motor start-up control circuits, common motor speed control circuits, common motor electromagnetic brake control circuits, common electrical protection circuits, common power-saving circuits, and common electrical controls. Experience circuit, common electrical lighting circuit, common alarm circuit, water level, temperature automatic control circuit, automatic control circuit, common electrician measurement circuit, common electrical equipment control circuit, common machine tool control circuit, power distribution engineering drawing, building electrical engineering drawing, etc. . The book briefly introduces the working principle, application occasions and issues that need attention of various commonly used circuits. It not only helps readers to understand and master the principles of electrical circuits, but also helps readers improve their ability to solve practical problems in electrical circuit installation, equipment modification and maintenance. This book is characterized by concise text, easy to understand, and convenient for practical operation. The graphic symbols and text symbols of the circuit diagrams adopt the new national standards. This book is not only a common and necessary manual for electrical equipment maintenance and circuit improvement, but also a practical technical reference book for teachers and students of electrical majors in higher and secondary vocational colleges. It can also be used as a teaching reference book for electrical technology training.

Chapter 1 Basic Motor Control Circuit 1

1.1 Three-phase asynchronous motor unidirectional start, stop control circuit 1

1.2 Electric interlock control circuit of electric motor 2

1.3 Interlocking control circuit of two three-phase asynchronous motors

1.4 Forward and reverse control circuit of three-phase asynchronous motor with button and contactor interlocking5

1.5 Forward and reverse control circuit of three-phase asynchronous motor controlled by transfer switch 7

1.6 Motor jog and continuous operation control circuit using intermediate relay interlock 8

1.7 Multi-site operation control circuit for electric motors 8

1.8 Sequence control circuit for multiple motors9

1.9 Stroke control circuit 10

1.10 Automatic reciprocating cycle control circuit 12

1.11 Automatic cycle control circuit without feed cutting 14

1.12 AC Power Drive DC Motor Control Circuit 15

1.13 Reversible operation control circuit of parallel excited DC motor 16

1.14 Reversible Operation Control Circuit for Series Excitation DC Motor 17

Chapter 2 Start Control Circuits for Common Motors 19

2.1 Cage Three-phase Asynchronous Motor Autotransformer (Starting Compensator) Decompression Start Control Circuit 19

2.1.1 Manually Controlled Auto-Coupled Decompression Starter Decompression Start 19

2.1.2 Time relay controlled autotransformer decompression start 20

2.2 Cage-type three-phase asynchronous motor star-delta (Y- △) decompression start control circuit 21

2.2.1 Button-switched Y- △ decompression start control circuit 22

2.2.2 Y- △ Decompression Start Control Circuit with Time Relay Automatic Switching 23

2.3 Winding rotor three-phase asynchronous motor rotor loop resistance start control circuit 24

2.3.1 Rotor circuit string resistance start control circuit controlled by time relay 24

2.3.2 Rotor circuit string resistance starting control circuit using current relay control 26

2.4 Winding rotor three-phase asynchronous motor rotor windings are connected in series with a frequency sensitive varistor start control circuit 28

2.5 Commonly used control circuit of three-phase asynchronous motor soft starter 29

2.6 Control circuit for starting a DC motor with a start varistor 31

2.7 Separately-excited DC motor armature loop resistance step-up start control circuit 32

2.8 Step-up start control circuit for armature loop resistance of parallel-excited DC motors 34

2.9 Series Excitation DC Motor Start-up Control Circuit 34

2.10 Reversible Operation Control Circuit for Parallel Excitation DC Motor String Resistance Startup 35

2.11 Reversible Operation Control Circuit for Series-Excitation DC Motor String Resistance Startup 37

Chapter 3 Common Motor Speed Control Circuits 39

3.1 Control circuit of single-winding two-speed variable-speed asynchronous motor

3.1.1 Single-winding two-speed motor control circuit using contactor control 40

3.1.2 Single-winding two-speed motor control circuit using time relay control 41

3.2 Winding rotor three-phase asynchronous motor rotor circuit resistance speed control circuit 43

3.3 electromagnetic speed control three-phase asynchronous motor control circuit 44

3.4 Frequency conversion speed control three-phase asynchronous motor control circuit 46

3.5 DC motor speed control circuit for changing armature voltage 48

3.6 DC motor armature loop resistance speed control circuit 50

3.7 Single-phase asynchronous motor reactor speed control circuit 51

3.8 Single-phase asynchronous motor winding tap speed control circuit 52

3.8.1 Single-phase asynchronous motor winding tap L-1 type connection speed control circuit 52

3.8.2 Single-phase asynchronous motor winding tap L-2 type connection speed control circuit 53

3.8.3 Single-phase asynchronous motor winding tap T-connection speed control circuit 53

3.9 Single Phase Asynchronous Motor Series Capacitor Speed Control Circuit 54

3.10 Single-phase asynchronous motor thyristor stepless speed control circuit 54

Chapter 4 Electromagnetic Brake Control Circuits for Common Motors 56

4.1 Reverse braking control circuit for three-phase asynchronous motor

4.1.1 One-way (irreversible) start, reverse connection of brake control circuit 56

4.1.2 Two-way (reversible) start, reverse connection of brake control circuit 58

4.2 Reverse braking control circuit for three-phase asynchronous motor

4.3 Three-phase asynchronous asynchronous motor energy consumption braking control circuit 62

4.3.1 Full-wave rectified unidirectional energy-consumption braking control circuit controlled by time principle 63

4.3.2 Full-wave rectification reversible energy-consumption braking control circuit controlled by time principle 64

4.3.3 Full-wave rectified unidirectional energy-consumption braking control circuit controlled according to the speed principle 64

4.3.4 Full-wave rectification reversible energy-consumption braking control circuit controlled according to the speed principle 66

4.4 DC Motor Reverse Brake Control Circuit 66

4.4.1 Knife Switch Controlled External Excitation DC Motor Reverse Brake Control Circuit 66

4.4.2 Button-Controlled Parallel Excitation DC Motor Reverse Brake Control Circuit 67

4.5 DC Motor Energy Brake Control Circuit 68

4.5.1 Button Controlled Parallel Excitation DC Motor Energy Consumption Brake Control Circuit 68

4.5.2 Braking Control Circuit for Energy Consumption of Parallel Excited DC Motor Controlled by Voltage Relay 69

4.6 Energy Consumption Braking Control Circuit for Series Excited DC Motor 70

4.6.1 Self-Excited Energy Consumption Braking

4.6.2 Other Excited Energy Consumption Brake 71

Chapter 5 Common Electrical Protection Circuits 73

5.1 Motor Overload Protection Circuit 73

5.1.1 Motor Double-Gate Protection Circuit 73

5.1.2 Dual fuse parallel control circuit at startup 74

5.1.3 Motor start and run fuse automatic switching control circuit 75

5.1.4 Motor protection circuits using current transformers and thermal relays

5.1.5 Motor protection circuits using current transformers and overcurrent relays 77

5.2 Motor Phase Failure Protection Circuit

5.2.1 Motor phase failure (broken wire voltage) protection circuit 78

5.2.2 Phase Opening Protection Circuit Using Thermal Relay

5.2.3 Zero-sequence voltage motor phase protection circuit composed of capacitors

5.2.4 Simple star-connected motor zero-sequence voltage phase failure protection circuit 80

5.2.5 Phase failure protection circuit using undercurrent relay

5.2.6 Zero-sequence current phase failure protection circuit

5.2.7 Simple Phase Failure Protection Circuit Using Intermediate Relays 84

5.3 DC motor demagnetization, overcurrent protection circuit 85

5.3.1 DC Motor Loss of Magnetic Protection Circuit 85

5.3.2 Protection circuit for DC motor excitation circuit

5.3.3 DC Motor Demagnetization and Overcurrent Protection Circuits

5.4 Water Ingress Protection Circuit Inside the Motor

5.4.1 Motor water protection circuit 88

5.4.2 Motor overheating, water protection circuit 89

5.5 Motor Protector Application Circuit 90

5.5.1 Typical Application Circuit of Motor Protector

5.5.2 Motor protector with current transformer application circuit 91

5.6 Low-voltage electrical protection circuits 93

5.6.1 Voltage-type leakage protection circuit 93

5.6.2 Contactor Contact Adhesion Device Protection Circuit

5.7 Protection circuit to prevent pump empty

Chapter 6 Common Power-Saving Circuits 97

6.1 Motor Light Load Energy Saving Circuit 97

6.2 Motor Y- △ Conversion Power Saving Circuit 99

6.2.1 Controlling Motor Y- △ Conversion Power Saving Circuit with Thermal Relay 99

6.2.2 Controlling Motor Y- △ Conversion Power Saving Circuit with Current Relay 99

6.3 Reactive power local compensation circuit of asynchronous motor 101

6.3.1 Direct start asynchronous motor local compensation circuit 101

6.3.2 Y- △ Start Induction Motor Local Compensation Circuit 101

6.4 No-load energy-saving circuit for electric sewing machine 102

6.5 Energy-saving circuits for low-voltage electrical appliances commonly used in motor control

6.5.1 AC Contactor Energy Saving Circuit 103

6.5.2 Relay Energy Saving Circuits

6.5.3 Relay Low-Power Pull-In Lockout Circuit 105

6.6 Other electrical equipment power-saving circuits 106

6.6.1 No-load self-stop power-saving circuit for machine tools 106

6.6.2 No-load self-stop power-saving circuit of textile machine 107

6.7 Simple AC Welder Power Saving Circuit 107

6.8 Incandescent power-saving circuit 108

Chapter 7 Common Electrical Control Experience Circuits 110

7.1 Encrypted Motor Control Circuit 110

7.2 Control Circuit for Three-phase Asynchronous Motor at Low Speed 111

7.3 Control Circuits for Controlling Motors with Safe Voltage 112

7.4 Control circuit allowing only one-way operation of the motor 113

7.5 Single-line remote control motor start and stop circuit 113

7.6 Single-line remote control motor forward and reverse circuit 115

7.7 Forward and Reverse Control Circuits with Triple Interlock Protection

7.8 Forward and Reverse Circuits to Prevent Phase-to-Stage Short Circuits 118

7.9 Control Circuit for Automatic Trip with One Travel Switch 119

7.10 Alternative Circuits for Motor Centrifugal Switches 120

7.11 Control circuit for DC operation of AC contactor 121

7.12 AC contactor emergency wiring circuit without auxiliary contacts 122

7.13 A Circuit to Control the Start and Stop of a Motor with a Button 123

Chapter 8 Common Electrical Lighting Circuits 125

8.1 Button Controlled Delay Lighting Circuit 125

8.2 Touch Delay Lighting Circuit 126

8.3 Light-Controlled Delay Lighting Circuit 127

8.4 Sound and Light Dual Control Delay Lighting Circuit 128

8.5 Automatic delay switch-off circuit for corridor lighting of building 129

8.6 Simple Dimming Circuit

8.7 Stepless dimming circuit 131

8.8 Sound activated flashing light circuit 132

8.9 Light Controlled Street Light Circuit 133

8.10 Simple Dimming Switch Circuit 134

8.11 Bedside Lamp Safety Switch Circuit 135

8.12 Automatic emergency lighting circuit 135

Chapter 9 Common Alarm Circuits 137

9.1 Simple Anti-theft Alarm Circuit 137

9.2 Fire Alarm Circuit

9.3 Earthquake alarm circuit 139

9.4 Photoelectric Control Alarm and Lighting Circuit 140

9.5 Light control granary full alarm circuit 141

9.6 Photoelectric Control Door Switch Alarm Circuit

9.7 Power failure, incoming call alarm circuit 143

9.8 Water Full Alarm Circuit

9.9 High-voltage side phase alarm circuit for small and medium-sized transformers 144

9.10 Fuse Fuse Alarm Circuit 145

9.11 Secondary side open circuit alarm circuit of current transformer 146

Chapter 10 Water Level and Temperature Automatic Control Circuits 147

10.1 Water Level Control Circuit Using Electric Contact Pressure Gauge 147

10.2 Transistor Water Level Control Circuits

10.3 Thyristor Water Level Control Circuits

10.4 Automatic Level Controller Circuits

10.5 Reed Switch Bidirectional Thyristor Water Level Control Circuit 152

10.6 Improved Automatic Water Level Control Circuit 153

10.7 Temperature Control Circuit Using Electrical Contact Thermometer 154

10.8 Temperature Controller Circuits

10.9 Automatic Thyristor Temperature Control Circuits

10.10 Temperature Automatic Controller Circuits

10.11 Constant Temperature Control Circuits

10.12 Electric oven temperature control circuit 158

10.13 Control circuit of incubator for incubating eggs 159

Chapter 11 Automatic Control Circuits 161

11.1 Timed Power-on Control Circuit 161

11.2 Automatic Sprinkler Irrigation Control Circuits

11.3 Intermittent Operation Control Circuits

11.4 Automatic Air-Cooled Control Circuits for Power Transformers

11.5 Electric Fan Analog Natural Wind Control Circuit 166

11.6 Fridge Delay Protector Circuits

11.7 Single-Phase Illumination and Dual Backup Circuits 167

11.8 Dual three-phase power self-throwing circuit 168

11.9 Automatic gas circulation furnace temperature control circuit 170

Chapter 12 Common Electrical Measurement Circuits 172

12.1 Current Measurement Circuits

12.1.1 DC Current Measurement Circuits

12.1.2 AC Current Measurement Circuits

12.1.3 Current Measurement Considerations

12.2 Voltage Measurement Circuits

12.2.1 DC Voltage Measurement Circuits

12.2.2 AC Voltage Measurement Circuits

12.2.3 Notes on Voltage Measurement

12.3 Power Measurement Circuits

12.3.1 Power Meter Wiring Modes

12.3.2 Measurement of DC Circuit Power

12.3.3 One Table Method for Measuring Active Power of Three-phase Symmetric Load

12.3.4 Two-meter method for measuring active power of three-phase three-wire asymmetric load circuit 184

12.3.5 Three-meter method for measuring active power of three-phase four-wire asymmetric load circuit

12.3.6 Measurement of Single-Phase Active Power on Low-Voltage and High-Current Lines

12.3.7 Measurement of Single-Phase Active Power on High-Voltage and High-Current Lines

12.3.8 Three-phase power meter directly connected to measure three-phase active power 188

12.3.9 Three-phase power meter measures three-phase active power via transformer 189

12.4 Electrical Measurement Circuits

12.4.1 Wiring method and precautions of electric energy meter 190

12.4.2 Direct-connection wiring for single-phase active energy meters

12.4.3 Single-phase active energy meter wiring via current transformers

12.4.4 Measuring the Active Energy of a Three-Phase Balanced Load with a Single-Phase Energy Meter 195

12.4.5 Measuring Three-Phase Active Energy with Three Single-Phase Energy Meters

12.4.6 Measuring Active Energy of Three-Phase Balanced Load with Two Single-Phase Energy Meters

12.4.7 Application Range and Wiring of Three-phase Three-wire Active Energy Meters 197

12.4.8 Application Range and Connection of Three-phase Four-wire Active Energy Meter

12.4.9 Precautions when the energy meter is connected to the circuit under test through the transformer 199

Chapter 13 Control Circuits for Common Electrical Equipment 201

13.1 Electromagnetic Brake Brake Control Circuit 201

13.1.1 Braking Control Circuit for Electromagnetic Brake Used in Hoisting Machinery 201

13.1.2 Braking control circuit for brake holding after power failure 202

13.2 Common Construction Machinery Control Circuits

13.2.1 Construction Site Hoist Control Circuit 203

13.2.2 Belt Conveyor Control Circuit 204

13.2.3 Control circuit of concrete mixer 206

13.3 Control Circuits for Common Agricultural Machinery

13.3.1 Control circuit of straw feed mill 207

13.3.2 Rice Processing Machinery Control Circuits

13.3.3 Control circuit for oil crop roaster 210

13.4 Water Supply Control Circuits

13.4.1 Automatic Water Supply Control Circuit 211

13.4.2 Towerless Booster Water Supply Circuits

13.5 Drain Pump Control Circuits

13.5.1 Drain Pump Control Circuits

13.5.2 Manual Control of Drain Pump Circuits in Two Places

13.6 Automatic Sprinkler Irrigation Control Circuits

13.7 Oil Pump Motor Control Circuit for Hydraulic Machines

13.7.1 Oil pump motor control circuit for common hydraulic machines 220

13.7.2 Oil pump motor control circuit with runaway protection 221

13.8 Control Circuits for Electric Hoists

Chapter 14 Control Circuits for Common Machine Tools 224

14.1C620-1 Lathe Electric Control Circuit 224

14.2CA6140 Lathe Electrical Control Circuit 225

14.3M7120 Type Surface Grinder Electric Control Circuit 225

14.4M1432A Universal Cylindrical Grinder Electric Control Circuit 227

14.5Z35 Radial Drilling Machine Electric Control Circuit 227

14.6Z3040 Radial Drilling Machine Electric Control Circuit 230

14.7X52K Electric Control Circuit for Vertical Lifting Mill 232

14.8X62W universal milling machine electrical control circuit 233

14.9T68 Horizontal Boring Machine Electric Control Circuit 233

14.10Y3150 Gear Hobbing Machine Electric Control Circuit 236

Chapter 15 Power Distribution Engineering Drawings 238

15.1 Primary Circuit 238

15.1.1 Classification of Electrical Main Wiring

15.1.2 Features of Electrical Main Wiring Diagrams

15.1.3 Basic Forms of Main Wiring in Power Supply Systems

15.1.4 Main wiring form of power distribution system 248

15.1.5 Main Substation Wiring 254

15.2 Secondary Circuit Diagrams

15.2.1 Classification of Secondary Circuits

15.2.2 Features of the Secondary Circuit Diagram

15.2.3 Secondary circuit principle wiring diagram 257

15.2.4 Secondary Circuit Deployment Wiring Diagram

15.2.5 Wiring Diagram of Silicon Rectifier Capacitor Energy Storage DC Operation Power System

15.2.6 Circuit Breaker Control and Signaling System with Electromagnetic Operation

15.2.7 Circuit diagram of electrical measuring instrument for 6 ~ 10kV high-voltage distribution line 263

15.2.8 220V / 380V low-voltage line electrical measuring instrument circuit diagram 264

Chapter 16 Building Electrical Engineering Drawings 266

16.1 Building Electrical Installation Plan 266

16.1.1 Purpose and Classification of Building Electrical Installation Plan 266

16.1.2 Features of Building Electrical Installation Plan

16.1.3 Floor Plan of a Medium-Scale Factory 35kV Buck Substation 270

16.1.4 Plan and Elevation Layout of a 10kV Substation in a Factory 272

16.1.5 General plan of low-voltage power distribution for a construction project 274

16.2 Power and Lighting Electrical Engineering Drawings

16.2.1 Wiring Modes for Power Distribution Systems

16.2.2 Wiring Modes of Lighting Distribution System

16.2.3 Wiring Modes for Multi-Layer Civil Building Power Supply Lines

16.2.4 Schematic, Wiring and Floor Plans of a Room's Lighting

16.2.5 Floor Plan of Electrical Lighting of a Building 284

16.2.6 Power Plan of a Boiler Room

16.3 Building Lightning and Grounding Engineering Drawings 289

16.3.1 Basic types of lightning protection and grounding

16.3.2 Lightning Protection Ground Plan of a Building

Addendum 295

Appendix A Common Text Symbols for Electrical Equipment 295

Appendix B Common Graphical Symbols for Electrical Equipment 296

Appendix C Reading of Electrical Control Circuit Diagrams 301

Appendix D Reading of Primary Circuit Diagrams 303

Appendix E. Reading the Secondary Circuit Diagram 305

Appendix F Reading of Building Electrical Engineering Drawings 309

References 312

电工电路速查常备手册 Download the electrician circuit quick check standing manual

Download Ranking

Latest information