1. 1 Common calculation formulas and basic laws of electricians

Common calculation formulas of 1. 1. 1 DC circuit

1. 1.2 Law of electromagnetic induction

1. 1.3 Common calculation formulas for AC circuits

1.2 Common legal units of measurement for electricians

1.3 common text symbols for electrical equipment

1.3. 1 Basic characteristics of electrical equipment

1.3.2 Common auxiliary text symbols for electrical equipment

1.4 common electrical diagrams, graphic symbols of AC motors

2. 1 Classification of AC motors

2.2 Three-phase asynchronous motor

2.2. 1 classification of three-phase asynchronous motors

2.2.2 Basic structure of three-phase asynchronous motor

2.2.3 Working principle of three-phase asynchronous motor

2.2.4 Model of three-phase asynchronous motor

2.2.5 Connection of three-phase asynchronous motor

2.2.6 Technical data of three-phase asynchronous motor

2.3 Single-phase asynchronous motor

2.3. 1 classification of single-phase asynchronous motors

2.3.2 Basic structure of single-phase asynchronous motor

2.3.3 Working principle of single-phase asynchronous motor

2.3.4 Model of single-phase asynchronous motor

2.3.5 Technical data of single-phase asynchronous motor

2.4 Selection of asynchronous motor

2.4. 1 motor type selection

2.4.2 Selection of mechanical characteristics of motor

2.4.3 Selection of motor housing protection grade

2.4.4 Selection of rated power of motor

2.4.5 Selection of motor power supply

2.4.6 Selection of motor speed

2.5 Operation and maintenance of asynchronous motor

2.5. 1 Preparation and inspection before starting the motor.

2.5.2 Matters needing attention when starting the motor

2.5.3 Monitoring and maintenance in motor operation

2.6 pole-changing multi-speed three-phase asynchronous motor

2.6. 1 pole-changing methods commonly used in pole-changing multi-speed three-phase asynchronous motors

2.6.2 Connection of three-phase winding of pole-changing multi-speed three-phase asynchronous motor

2.6.3 Technical data of pole-changing multi-speed three-phase asynchronous motor

2.6.4 Use and maintenance of pole-changing multi-speed three-phase asynchronous motor

2.7 electromagnetic speed regulating asynchronous motor

2.7. 1 Basic structure of electromagnetic variable speed asynchronous motor

2.7.2 Working principle of electromagnetic speed regulating asynchronous motor

2.7.3 Common faults and troubleshooting methods of electromagnetic adjustable speed asynchronous motor.

2.8 Common faults of asynchronous motors and their elimination methods

2.8. 1 Common faults of three-phase asynchronous motor and their elimination methods

2.8.2 Common faults of single-phase asynchronous motor and their elimination methods

2.9 Simple calculation of asynchronous motor

2.9. 1 Substitution Calculation of Electromagnetic Wire for Asynchronous Motor

2.9.2 Calculation of Pole Changing of Asynchronous Motor

2.9.3 Calculation of Variable Voltage of Asynchronous Motor

2.9.4 Frequency conversion calculation of asynchronous motor

2. 10 Common power tools

2. 10. 1 electric drill

2. 10 .2 impact drill

2. 10 .3 electric hammer DC motor

3. 1 DC motor

3. Classification of1.1DC vehicles

3. Basic structure of1.2 DC motor

3.1.3 working principle of DC motor

3. 1.4 model DC car

3. 1.5 DC motor technical data

3. 1.6 DC motor selection and examples

3. Use and maintenance of1.7 DC motor

3. Common faults of1.8 DC motor and their elimination methods

3.2 DC arc welding generator

3. 2. 1 DC arc welding generator classification

3.2.2 Structure of DC arc welding generator

3.2.3 working principle of DC arc welding generator

3.2.4 Use and maintenance of DC arc welding generator

3.2.5 Common faults and troubleshooting methods of DC arc welding generator control motor

4. 1 Classification of control motors

4.2 Servo motor

4.2. 1 DC servo motor

Ac servo motor

4.3 tachogenerator

4.3. 1 DC tachogenerator

4.3.2 Synchronous tachogenerator

4.3.3 Asynchronous tachogenerator

4.3.4 Selection of tachogenerator

4.4 Synchronous machine

4.4. 1 synchronous classification

Torque synchronizer

Controlled synchronous machine

4.4.4 Technical data of synchronous machine

4.4.5 Selection of Synchronizer

4.5 resolver

Application of decomposer

4.5.2 Classification of decomposers

4.5.3 Structure of Decomposer

4.5.4 Working principle of resolver

4.5.5 Main technical indexes of resolver

4.5.6 Technical data of resolver

4.6 stepping motor

The purpose of stepping motor

Classification of stepping motors

4.6.3 Structure of reactive stepping motor

4.6.4 Working principle of reactive stepping motor

4.6.5 The connection mode of three-phase reactive stepping motor and the relationship between step angle and speed.

Technical data of stepping motor

4.6.7 Common faults of stepping motor and troubleshooting methods Transformer

5. 1 transformer

5. 1. 1 Classification of transformers

5. 1.2 structure and working principle of transformer

5. 1.3 Main technical parameters of transformer

5. 1.4 Model meaning and technical data of transformer

5. 1.5 Selection of transformer capacity

5. 1.6 Operation and maintenance of transformer

5. 1.7 Common faults of transformer and troubleshooting methods

5.2 mutual inductor

Voltage transformer

Current transformer

5.3 Welding transformer

5.3. 1 Working principle of welding transformer

5.3.2 Basic structure of welding transformer

5.3.3 Technical data of welding transformer

5.3.4 Use and maintenance of welding transformer

5.3.5 Common faults of welding transformer and their elimination methods Low-voltage electrical appliances are commonly used.

6. 1 Classification and application of low-voltage electrical appliances

6. 1. 1 Classification and application of low-voltage electrical appliances

6. 1.2 low-voltage electrical appliance model

6. 1.3 categories of low-voltage electrical appliances

6.2 Combination of breaker, isolator and fuse

6.2. 1 breaker and isolator

Turn on the load switch

Turn off the load switch

6.2.4 Common faults of knife switch and their elimination methods

6.3 fuse

6.3. 1 ceramic plug-in fuse

Spiral fuse

6.3.3 Unpackaged closed tube fuse

6.3.4 Filled closed tube fuse

6.3.5 Selection and Examples of Fuses

6.3.6 Common faults of fuses and their elimination methods

6.4 circuit breaker

6.4. 1 universal circuit breaker

Plastic case circuit breaker

6.4.3 Selection and Examples of Circuit Breakers

6.4.4 Common faults of circuit breakers and their elimination methods

6.5 contactor

6.5. 1 AC contactor

DC contactor

6.5.3 Selection and Examples of Contactor

6.5.4 Common faults of contactors and their elimination methods

6.6 relay

6.6. 1 intermediate relay

Time relay

thermorelay

Selection and examples of relays

6.6.5 Common faults of relay and their elimination methods

6.7 Main electrical appliances

6.7. 1 control button

travel switch

6.8 starter

6.8. 1 electromagnetic starter

6.8.2 stars? Triangular starter

Automatic coupling decompression starter

6.8.4 Selection of starter

6.8.5 Common faults of starter and troubleshooting methods Electric drive and control

7. 1 Starting method of asynchronous motor

7. 1. 1 Direct starting of asynchronous motor

7. 1.2 autotransformer starting of asynchronous motor

Asynchronous motor 7. 1.3 Y? △ Start

7. 1.4 Startup of wound rotor three-phase asynchronous motor

7.2 Speed regulation method of asynchronous motor

7.2. 1 speed regulation method of cage three-phase asynchronous motor

7.2.2 Speed regulation method of wound rotor three-phase asynchronous motor

7.3 braking method of three-phase asynchronous motor

7.3. 1 feedback braking of three-phase asynchronous motor

7.3.2 Reverse braking of three-phase asynchronous motor

7.3.3 Energy consumption braking of three-phase asynchronous motor

7.4 Starting method of motor

7. 4. 1 DC motor starts directly.

7. 4. 2 DC motor step-down start

7.4.3 Startup of series resistance of armature circuit of DC motor

7.5 Speed adjustment of motor

7. 5. 1 DC motor armature circuit series resistance speed regulation

7.5.2 DC motor speed regulation by changing armature terminal voltage.

7.5.3 DC motor is regulated by changing the excitation current.

7.6 Brake of motor

7. 6. 1 DC motor energy consumption braking

7. 6. 2 DC motor reverse braking

7. 6. 3 DC motor feedback braking

7.7 Common Control Circuits of AC Motor and Related Calculations

7.7. 1 unidirectional start-stop control circuit of three-phase asynchronous motor

7.7.2 Forward and reverse control circuit of three-phase asynchronous motor

7.7.3 Three-phase asynchronous motor inching and continuous operation control circuit

7.7.4 Motor multi-position operation control circuit

7.7.5 Sequence control circuit of multiple motors

7.7.6 Stroke control circuit of three-phase asynchronous motor

7.7.7 Three-phase asynchronous motor automatic reciprocating cycle control circuit

7.7.8 Starting control circuit of stator winding series resistance (or reactor) of cage three-phase asynchronous motor

7.7.9 Cage three-phase asynchronous motor Y? △ step-down start control circuit

7.7. 10 squirrel-cage three-phase asynchronous motor adopts autotransformer to start the control circuit.

7.7. 1 1 calculation example of starting mode selection of cage three-phase asynchronous motor

7.7. 12 series resistance start control circuit of rotor circuit of wound rotor three-phase asynchronous motor

7.7. 13 calculation example of rotor circuit series resistance step-by-step starting of wound rotor three-phase asynchronous motor

7.7. 14 Start control circuit of series frequency-sensitive rheostat in rotor circuit of wound rotor three-phase asynchronous motor

7.7. 15 control circuit of single-winding double-speed three-phase asynchronous motor

7.7. 16 Calculation example of frequency conversion speed regulation of cage three-phase asynchronous motor

7.7. 17 control circuit of electromagnetic speed regulating asynchronous motor

7.7. 18 series resistance speed regulating circuit for rotor circuit of wound rotor three-phase asynchronous motor

7.7. 1 9 calculation example of rotor circuit series resistance speed regulation of wound rotor three-phase asynchronous motor

7.7.20 Reverse braking control circuit of three-phase asynchronous motor

7.7.2 1 energy consumption braking control circuit of three-phase asynchronous motor

7.8 Common Control Circuits of Motors and Related Calculations

7.8. 1 DC motor forward and reverse operation control circuit

7.8.2 DC motor start control circuit

7.8.3 Calculation Example of DC Motor Startup

7.8.4 Calculation Example of DC Motor Speed Regulation

7.8.5 DC motor braking control circuit

7.8.6 DC motor braking calculation example Small power generation equipment is commonly used.

8. 1 diesel generator set

8. 1. 1 Characteristics of diesel generator set

8. 1.2 Composition of diesel generator

8. 1.3 diesel engine

8. 1.4 synchronous generator

8. 1.5 Selection of diesel generator set

8. 1.6 Use and maintenance of diesel generator set

8. 1.7 Common faults of diesel generator set and troubleshooting methods

8.2 Small wind turbines

8.2. 1 Composition of wind power generation system

8.2.2 Classification of wind power generation

8.2.3 Selection of Installation Location of Wind Turbine Generator

8.2.4 Installation of Small Wind Turbine Generator

8.2.5 Operation and maintenance of small wind turbines

8.2.6 Common faults of small wind turbines and their elimination methods Low-voltage power supply and distribution lines

9. 1 power system

9. 1. 1 Composition of power system

9. 1.2 Production characteristics of power system

9.2 Low-voltage overhead lines

9.2. 1 General provisions for low-voltage overhead lines

9.2.2 Selection of Low-voltage Overhead Line Path

9.3 Main components of low-voltage overhead lines

9.3. 1 pole

cross arm

insulator

act as a middleman

hardware

conductor

9.4 Inspection and Maintenance of Overhead Lines

9.4. 1 overhead line inspection

Maintenance of overhead lines

9.5 Access Lines and Access Lines

9.5. 1 low voltage incoming mode

connecting line

9.5.3 Indoor distribution lines and electrical lighting incoming lines

10. 1 Basic requirements for indoor distribution lines

10. 1 Concept and basic requirements of indoor wiring

10. 1.2 indoor distribution line design

10. 1.3 wiring connection of indoor distribution lines

10.2 process requirements for indoor distribution lines

10.2. 1 porcelain splint wiring

10.2.2 Slotted board wiring

10.2.3 plastic sheathed wiring

10.2.4 conduit wiring

10.3 Basic knowledge of electric lighting

10.3. 1 concept and classification of electric lighting

10.3.2 Common physical quantities for electric lighting

10.3.3 quality requirements for electric lighting

10.4 classification and characteristics of common electric light sources

10.4. 1 classification of common electric light sources

10.4.2 characteristic parameters of electric light source

10.4.3 selection of electric light source

10.5 classification and installation of lighting fixtures

10.5. 1 Classification of lighting fixtures

10.5.2 lamp installation

10.6 use, installation and troubleshooting of lighting equipment

10.6. 1 incandescent lamp

10.6.2 fluorescent lamp

10.6.3 high-pressure mercury lamp

10.6.4 tungsten halogen lamp

10.6.5 electrical materials for high-pressure sodium lamps

1 1. 1 conductive material

11.1.1bare wire

1 1. 1.2 insulated wire

1 1. 1.3 electromagnetic wire

1 1. 1.4 cable

1 1.2 insulation material

1 1.2. 1 Classification of insulating materials

1 1.2.2 insulating paint

1 1.2.3 insulation impregnated fiber products

1 1.2.4 electrical films, tapes and composites

1 1.2.5 laminate

1 1.2.6 mica products

1 1.3 magnetic materials

1 1.3. 1 electromagnetic pure iron

1 1.3.2 electrical silicon steel sheet electrical instrument and measurement

12. 1 Type and accuracy grade of electrical instruments

12. 1. 1 electrical instrument classification

12. 1.2 electrical instrument model

12. 1.3 accuracy grade of electrical instruments

12. 1.4 symbols for electrical instrument panel

12.2 ammeter and voltmeter

12.2. 1 magnetoelectric ammeter and voltmeter

12.2.2 electromagnetic ammeter and voltmeter

12.2.3 electric meters and voltmeters

12.2.4 selection and use of ammeter and voltmeter

12.3 watt-hour meter

12.3. 1 Structure and working principle of electric energy meter

12.3.2 structure and working principle of electronic watt-hour meter

12.3.3 technical data of electric energy meter

12.3.4 technical data of electronic watt-hour meter

12.3.5 common faults of electric energy meter and their elimination methods

12.3.6 matters needing attention in the use of electric energy meter

12.4 multimeter

12.4. 1 structure and working principle of multimeter

12.4.2 technical data of multimeter

12.4.3 common faults of multimeter and their troubleshooting methods

12.4.4 precautions for using multimeter

12.5 insulation resistance meter

12.5. 1 Structure and working principle of insulation resistance meter

12.5.2 technical data of insulation resistance meter

12.5.3 Common faults and troubleshooting methods of insulation resistance meter

12.5.4 precautions in the use of insulation resistance meter

12.6 Clamping table

12.6. 1 Structure and working principle of clamp meter

12.6.2 technical data of clamp table

12.6.3 common faults and troubleshooting methods of clamp ammeter

12.6.4 precautions for the use of clamp ammeter

12.7 digital multimeter

12.7. 1 Structure and working principle of digital multimeter

12.7.2 technical data of digital multimeter

12.7.3 precautions for using digital multimeter

12.8 bridge

Structure and working principle of 12.8. 1 bridge

12.8.2 bridge technical data

12.8.3 precautions for the use of electric bridge

12.9 general oscilloscope

12.9. 1 related components and functions of general oscilloscope

12.9.2 electronic technology foundation of oscilloscope maintenance

13. 1 crystal diode and its application circuit

13. 1. 1 Structure and classification of crystal diodes

Characteristics and main technical parameters of 13. 1.2 crystal diode

13.10.3 common crystal diode models and technical data

13. 1.4 common sense of crystal diode use

13. 1.5 rectifier circuit

13. 1.6 filter circuit

13.2 transistor and its application circuit

Structure and classification of 1 transistors

Characteristics and main technical parameters of 13.2.2 transistor

13.2.3 transistor model and technical data

13.2.4 common sense of using transistors

13.2.5 transistor basic amplifier circuit

13.2.6 transistor multistage amplifier circuit

13.2.7 power amplifier circuit

13.2.8 DC amplifier circuit

13.2.9 feedback circuit

13.3 field effect transistor and its application circuit

13.3. 1 Structure and classification of field effect transistors

Characteristics and main technical parameters of 13.3.2 field effect transistor

Three basic connection and bias circuits of 13.3.3 field effect transistor

13.3.4 comparison between field effect transistor and triode

13.4 integrated circuit

1 Classification of integrated circuits

13.4.2 integrated operational amplifier

13.4.3 detection of integrated circuits

13.5 logic circuit

13.5. 1 logic gate circuit

13.5.2 integrated logic gate power electronics technology

14. 1 power electronic equipment

14. 1. 1 classification of power electronic devices

14. 1.2 rectifier diode

14. 1.3 Schottky diode

14. 1.4 ordinary thyristor

14. 1.5 special thyristor

1.6 bipolar junction transistor

14. 1.7 power field effect transistor

14. 1.8 insulated gate bipolar transistor

14. 1.9 Other new power electronic devices

14.2 power electronic circuit

14.2. 1 controllable rectifier circuit

14.2.2 inverter circuit

14.2.3 DC chopper circuit

14.2.4 AC voltage regulating circuit

14.3 driving circuit of power electronic devices

14.3. 1 thyristor trigger circuit

14.3.2 fully controlled equipment drive circuit programmable controller PLC

15. 1 overview

The definition of 15. 1. 1 PLC

15.1.2 Classification of PLC

15.1.3 Main functions and characteristics of PLC

Basic composition and working principle of 15.2 PLC

The basic composition of 1 PLC

15.2.2 working principle of PLC

15.2.3 technical performance index of PLC

15.3 programming

Programming language of 1 PLC

15.3.2 Use of main instructions

15.3.3 preparation before ladder diagram programming

Equivalent transformation of 15.3.4 ladder diagram

15.4 use and maintenance of programmable controller

Use 15.4. 1 PLC.

15.4.2 maintenance sensor of PLC

16. 1 Basic knowledge of sensor and detection technology

16. 1. 1 definition of sensor

Use 16. 1.2 sensor.

16. 1.3 sensor.

16. 1.4 classification of sensors

Basic characteristics of 16. 1.5 sensor

16. 1.6 sensor performance index

Matters needing attention when selecting sensors

16.2 Common sensors

16.2. 1 temperature sensor

16.2.2 force sensor

16.2.3 photosensitive sensor

16.2.4 magnetic sensor

16.2.5 gas sensor

16.2.6 humidity sensor

16.2.7 Other sensors

16.2.8 intelligent sensor

17. 1 Basic knowledge of frequency converter

17. 1. 1 Basic types and main features of frequency converters.

17. 1.2 Basic structure of universal frequency converter

17. 1.3 general frequency converter standard technical specification

17.10.4 main technical data of universal frequency converter

17.2 variable frequency speed regulation system

17.2. 1 Composition and characteristics of variable frequency speed regulation system

17.2.2 basic principle of variable frequency speed regulation

17.2.3 basic modes and characteristics of variable frequency speed regulation

17.2.4 selection of inverter type

17.2.5 selection of motor capacity of variable frequency speed regulation system

17.2.6 inverter capacity selection

17.2.7 problems that should be paid attention to when general frequency converter is used in special motors.

17.2.8 frequency converter selection example

17.2.9 Types and uses of frequency converter peripherals

17.3 installation and operation of frequency converter

17.3. 1 installation environment of frequency converter

17.3.2 installation of frequency converter

17.3.3 frequency converter before power-on.

17.3.4 no-load power-on inspection of frequency converter

17.3.5 no-load operation of frequency converter with motor

17.3.6 commissioning of frequency converter with load

17.4 frequency converter maintenance

1 Daily inspection and regular inspection

17.4.2 basic measurement method of frequency converter

17.4.3 Maintenance of inverter battery and uninterruptible power supply

18. 1 battery

18. 1. 1 Basic concept of battery

Basic structure and working principle of 18. 1.2 battery

18. 1.3 battery usage

18. 1.4 battery maintenance

18.2 uninterruptible power supply

1 Basic types of uninterruptible power supply

18.2.2 basic structure and working principle of uninterruptible power supply

18.2.3 Common UPS technical data

18.2.4 UPS and its maintenance and safe power consumption.

19. 1 forms of electric shock and electric shock first aid

19. 1. 1 electric shock form

19. 1.2 electric shock rescue

19.2 grounding device and lightning protection

19.2. 1 grounding device

65438+

19.2.3 lightning protection device

19.3 electrical safety knowledge

19.3. 1 safety current and safe voltage

19.3.2 safety measures against electric shock

19.4 leakage protector

19.4. 1 classification of leakage protectors

19.4.2 structure and working principle of leakage protector

19.4.3 Common technical data of leakage protector

Common faults and troubleshooting methods of leakage protector

19.4.5 matters needing attention in selecting leakage protector

refer to