I want the specific basics of an electrician, the basics of an electrician

Technical knowledge of maintenance electricians in industrial and mining enterprises and institutions.

Practical Electrical Mathematics.

Chapter 1 Indices.

Chapter 2 Trigonometric Functions.

Chapter 3 Vector Cloud Calculation of Sinusoids.

Chapter IV: Plural.

Chapter 5 Symmetrical Component Method.

Electrician Basics. Chapter 1 Basic Concepts of DC Circuits.

Chapter 2 Analysis and Calculation of DC Circuits.

Chapter 3 Capacitors.

Chapter 4 Electromagnetism and Electromagnetic Induction.

Chapter 5 Sinusoidal AC circuits.

Chapter 6 Three-phase sinusoidal AC circuits.

Fundamentals of Electronic Technology.

Chapter 1 Semiconductor Devices.

Chapter 2 Fundamentals of Amplifier Analysis.

Chapter 3 AC Amplifiers.

Chapter 4 Negative Feedback Amplifiers.

Chapter 5 Sine Wave Oscillators.

Chapter 6 Direct Coupled Amplifiers.

Chapter 7 Integrated Operational Amplifiers and Their Applications.

Chapter 8 DC regulated power supply.

Chapter 9 Controllable Rectifier Circuits.

Electrotechnical safety technology.

Chapter 1 Overview of Electricity Safety.

Chapter II: Security System.

Chapter 3 Grounding and Zeroing.

Chapter 4 Fire Prevention and Explosion Prevention.

Chapter V Lightning Protection.

Chapter VI: Special Protection.

Chapter VII Rescue for Electric Shock.

Chapter VIII Safety Equipment.

Maintenance and repair of electrical equipment in industrial and mining enterprises and institutions.

Part 1 Transformers and AC and DC motors.

Chapter 1 Transformers.

Chapter 2 DC Motors.

Chapter 3 Asynchronous Motors.

Chapter 4 Synchronous Generators.

Part 2 Electric Traction and High and Low Voltage Electrical Appliances.

Chapter 5 Electric dragging.

Chapter VI High Voltage Electrical Appliances.

Chapter VII Low-voltage electrical appliances.

Part 3 Secondary wiring and relay protection.

Chapter VIII Test Methods for Electrical Insulation.

Chapter 9 Overhead Power Lines and Substations and Distribution Stations.

Chapter 10 Secondary wiring and relay protection devices.

Part 4 Electrical Instrumentation and Measurement Technology Electrical Lighting.

Chapter 11 Commonly used electrical instruments.

Chapter 12 Electrical Lighting.

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The basic knowledge of electricians is as follows:

Electrician knowledge includes the basic concepts of circuits, power sources, loads, currents, the basic properties of voltage, etc.

1. Circuit

The path through which the current travels is called the circuit. The composition of the circuit is generally composed of a power supply, a load and a connection part (wire, switch, fuse), etc.

2. Power supply

A power supply is a device that converts non-electrical energy into electrical energy.

3. Load

The load is a device that draws electrical energy, that is, an electrical device. The connection part is used to connect the power supply and the load, constituting the intermediate link of the current path, and is used to transport, distribute and control electric energy.

4. The basic concept of electric current

When the charge flows in a regular direction, an electric current is formed, and it is customary to stipulate that the direction of the movement of the charge is the actual direction of the current. A circuit in which the direction of the current does not change is called a DC circuit. The amount of electricity passing through any cross-section of a conductor per unit of time is called current (intensity) and is represented by the symbol i.

5. The basic properties of voltage

1) The voltage between two points has a unique and definite value.

2) The voltage between two points is only related to the position of these two points, not the path of the charge.

3) There are positive and negative voltages, which are related to the direction of the reference voltage of the flag.

4) Walk along any closed circuit in the circuit, and the sum of the voltages of each section is always zero.

1. Left zero right fire 2, three-phase five-wire system with colors yellow, green, red, light blue respectively represent U, V, W, N protective grounding wire double color (PE) 3, transformer in operation, transformer phase current should not exceed the rated current; The maximum unbalanced current shall not exceed 25% of the rated current. After the transformer is put into operation, it should be overhauled regularly. 4. In the system of power supply of the same transformer, it is not suitable to mix protection grounding and protection zero.

5. The rated voltage of the secondary coil of the voltage transformer is generally the secondary side of the voltage transformer, and it shall not be short-circuited when working. Because a large short-circuit current will be generated in the event of a short circuit, the transformer may be burned out, so fuses are installed on the primary and secondary sides of the voltage transformer for protection.

7. One end of the secondary side of the voltage transformer must be grounded. This is to prevent the primary and secondary coil insulation breakdown, the primary high voltage into the secondary side, endangering the safety of personnel and equipment. 8. The secondary side of the current transformer is close to the short circuit condition when it is working.

The rated current of the secondary coil is generally 5A9, the secondary side of the current transformer is never allowed to open the circuit when working, 10, one end of the secondary side of the current transformer must be grounded to prevent it.

When the insulation of the primary and secondary coils breaks down, the high voltage on the primary side enters the secondary side. 11. When the current transformer is connected, pay attention to it.

First, the polarity of the secondary coil, China's transformer adopts the marking method of reduced polarity. 12. When installing, it must be noted that the wiring is correct and reliable, and the secondary side is not allowed to connect the fuse or switch. Even if for some reason the instrument or other device on the secondary side is to be removed, the secondary side must be shorted before it is removed.