What are the basics of a junior electrician?

1. The path through which the current passes 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. A power supply is a device that converts non-electric energy into electrical energy.

3. The load is a device for taking electric 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 current is formed when the charge flows in a regular direction, and it is customary to stipulate that the direction of the positive charge movement 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.

The unit of current (intensity) is ampere (a), the unit of high current is often expressed in kiloamperes (ka), the unit of small current is commonly expressed in milliampere (ma), and the unit of microampere (a).

5. The basic nature 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 movement.

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

The concept of circuit, power supply, load, current, resistance.

The contents of the ohmic resistance of some circuits and Ohm's law of the whole circuit, and the contents of the three elements of alternating current.

The significance of improving the power factor.

What is underpayment? Overcompensated? Fully compensated?

Concept and classification of power grids.

The voltage regulation method of the transformer and the voltage regulation method of the company's transformer.

The operating temperature and temperature rise range of the transformer, the test items and test cycle of the transformer oil.

Precautions for transformer oil replenishment and precautions for inspection.

1. Equipment installation.

1) When installing switchgear with return springs such as high-pressure oil switches and automatic air switches, the switches should be placed in the disconnected position.

2) When transporting the distribution cabinet, there should be a special person to command, and the pace should be consistent. When multiple switchboards (boxes) are installed in parallel, fingers should not be placed on the joint parts of the two panels (boxes), and the connecting screws and screws should not be touched.

3) Electrical equipment used in the open air should have good rainproof performance or reliable rainproof facilities. The distribution box must be firm, complete and tight. It is forbidden to place sundries in the distribution box in use.

4) When removing grooves and punching holes, protective glasses must be worn, and the hammer handle must not be loosened. The chisel shall not be curled or cracked. When the wall or floor slab is penetrated, no one should approach behind the wall and under the floor slab.

Second, the inner line installation.

1) When installing lighting lines, do not walk or stack materials directly on the slatted ceiling or sound insulation board; When walking is required for operation, scaffolding boards must be laid on the large corrugated wall; The lighting in the ceiling should use 36V low-voltage power supply.

2) When working on scaffolding, the scaffold board must be fully paved, and there must be no gaps and probe boards. The materials and tools used should be put in the tool bag and carried with you, and should not be thrown.

3) When simmering with a manpower bender on the platform and floor, the back should be turned to the center of the building, and the face should be avoided during operation. When filling the sand simmering pipe with a large diameter pipe, the sand must be dried with fire and then poured in. When beating with machinery, no one should stand below, and the manual beating should be staggered up and down, and when the pipe is heated, no one should stay in front of the nozzle.

4) When the pipe is threaded, it is not allowed to call or blow on the nozzle to prevent the ribbon line from popping out. The two people should cooperate and coordinate with each other, and respond to each call. Thread at a high place, and do not use too much force.

5) The steel cable hanger should be laid to prevent the steel cable head from being punctured. The tension of the steel cable is applied with moderate force to prevent the basket bolt from breaking.

6) When using casing machine, electric grinding wheel, bench drill, and hand electric drill, it should be ensured that the insulation is good and there is reliable zero grounding. The leakage protection device is sensitive and effective.

How to learn electrician:

First, electrical technology needs to be interested.

Cultivating interest or electrical technology is caused by your interest, only if you are really interested in a profession or what you want to do, then you will not give up because it is boring in the process of learning, because it is what you like to do, even if it is boring, you will enjoy it.

Second, the basic knowledge of electricians is the first step to get started.

The basic knowledge of electricians includes: the basic principles of circuits, the composition of circuits, the use of electrical tools, the structure and function of electrical or electronic components, the origin of three-phase electricity, factory power distribution, power drag, electrician safety operation procedures, etc.

The accumulation of basic knowledge of electricians is very important, if the foundation is not stable or not strong enough, then the skills of electricians are not high, and the salary of electricians with basic knowledge is relatively low, and the salary of electricians with basic knowledge is relatively high, and they can go further in the electrical industry.

3. Electricians are very practical and must have hands-on ability.

After mastering the basic theoretical knowledge, you must also participate in practice, and the electrotechnical technology focuses on hands-on ability, and can actually apply what you have learned, rather than moving your mouth. Therefore, you can learn while practicing at work, enrich your experience and hands-on experience, and learn while working, so that you can improve very quickly.

Almost all electricians have been exposed to the classic circuits: motor forward and reverse circuits, motor delta step-down start, motor speed regulation circuits, motor intermittent operation circuits, etc., these are the basic circuit diagrams for electricians to get started, they must be mastered, and it is best to be able to understand and draw them by themselves, which is the basis of electrical circuits, and it is also the only way to understand more difficult circuit diagrams.

The basic knowledge of electricians mainly includes the composition and basic knowledge of circuits, the basic analysis methods of circuits, single-phase sinusoidal AC circuits, three-phase sinusoidal AC circuits, the transition process of first-order circuits, magnetic circuits and electromagnets, and the safe use of electricity. The symbols and letters of electrical circuits, the selection of board knife switches, the common methods of inverter maintenance and detection, the method of emptying and adding refrigerant to the refrigerator, the selection and maintenance of low-voltage motor fuses, and the most comprehensive use. Fundamentals of Engineering - Learn Electrotechnical Techniques - Electrotechnic.com. Welcome to visit is a focus on providing free electrician knowledge tutorials**, you can master the knowledge that electricians should master at all stages through the course system here

1 DC circuit. The basic concept of circuits. Resistance and conductance, Ohm's law.

Electrical work and electrical power and thermal effects of electric current. Kirchhoff .

What are the basics of being an electrician, or want to be one? The first point is to pay attention to safety, playing electricity is not a joke, without a little safety awareness, sooner or later it will be over. The most basic point is to know how much voltage and current the human body can withstand?

Generally speaking, the human body....

Electrician Basics Electrician Basics Maintenance Electrician Basics Electrician's Home.

Electrician Basics Electrician Basics Maintenance Electrician Basics Electrician's Home. You are here: Electrician's Home > Electrician Fundamentals >

Master electricians are the most likely to make mistakes. AC and DC resistance. What is zero-crossing detection?

Pass. Why single-phase 220V three-phase. What is called phase voltage.

Three-phase alternating current is called a wire. The magnitude of the resistance determines the negative.

There are two main steps to self-taught electrician:

1. Learn theoretical knowledge and lay a good theoretical foundation, and you can study professional books such as "Fundamentals of Electrician" and "Electrical Engineering".

Second, apply for the electrician certificate, you will have the opportunity to go to the laboratory to operate, go to the factory to practice and learn.

Electrician refers to the study of the objective laws in the field of electromagnetism and the science and technology of its application, as well as the two major industrial systems of power production and electrical manufacturing. Personnel must hold an electrician's certificate to work.

The electrician certificate is a certificate obtained by learning to install electricians and maintenance electricians, which is divided into special operation operators, electrician network access operation permits, professional qualification certificates and construction special operation qualification certificates.

Junior electricians should have basic electrical principle knowledge, the principle and application of commonly used factory electrical appliances, understand the use and maintenance of commonly used electrical measuring instruments, tools and protective appliances in electrical circuit diagrams, the installation, laying and use and maintenance of indoor lines, overhead lines and cable lines, common wire types, selection and connection methods, AC asynchronous motor types, uses and operation control, maintenance, installation and overhaul, commonly used substation and distribution equipment and control of low-voltage electrical appliances, safe operation and operation of substations, and first aid methods for electric shock.

1. There must be (strong current, weak current) construction drawings before decoration, and provide electrical engineering completion drawings when completed.

2. Electrical installation and construction personnel should be certified to work.

3. The wiring should be colored, the color of the phase line (L) should be unified, the neutral line (N) should be black, and the protection line (PE) must be yellow and green.

The basics of getting started with electricians are as follows:

1. The desoldering of the soldering components on the printed circuit board is the same as soldering, the action should be fast, and the heating time of the pad should be short, otherwise the components will be scalded or the copper foil of the printed circuit board will be blistered and peeled.

2. In order to ensure the safety of electricity, the insulation layer of the wire must be restored after it is damaged, and the insulation must also be restored after the wire is connected.

3. The rated voltage of the secondary coil of the voltage transformer is generally 100V.

4. There are many kinds of cores of commonly used power lines, such as single strands, 7 strands and 19 strands, and the number of core strands is different, and the connection method is also different. When the wire is not long enough or the branch is tapped, the wire should be connected to the wire.

5. Insulating pads should be laid on the passages for the operation and maintenance of low-voltage power distribution devices, and it is strictly forbidden to stack other items on the passages.

1. Left zero and right fire.

2. The colors of the three-phase five-wire system are yellow, green, red and light blue respectively to represent the double color (PE) of the protective grounding wire.

3. During the operation of the transformer, the current of each phase of the transformer 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. The rated voltage of the secondary coil of the voltage transformer is generally 100V.

5. The secondary side of the voltage transformer 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.

6. 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.

7. 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 5A.

8. The secondary side of the current transformer is never allowed to open the circuit when working.

9. 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.

10. During installation, 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.

11. Low-voltage switch refers to isolating switches, circuit breakers, fuses and so on below 1kV.

12. The load controlled by the low-voltage distribution device must be clearly divided, and it is strictly forbidden to control and confuse one gate.

13. The interlocking device of low-voltage power distribution device and self-provided generator equipment should operate reliably. It is strictly forbidden to run self-provided power generation equipment in parallel with the power grid without permission.

14. When connecting the equipment: connect the equipment first, then connect the power supply. When disassembling the device: disassemble the power supply first, and then disassemble the device. When connecting the line: connect the zero line first, then connect the live wire. When dismantling the line: dismantle the fire line first, and then dismantle the zero line.

Extended Material: Here's an introduction to how a novice electrician can start with the basics:

1. Basic knowledge of electrician, which is the basis for analyzing circuits.

2. Low-voltage electrical equipment, the key to understanding electrical equipment.

3. Electrical components and circuits, familiar with the components and circuit composition, and the cognition of electrical drawings.

4. Practical experience.