What are the introductory knowledge of fire electrician?

1, the composition of the circuit

The basic components of the circuit are power supply, load and the intermediate link connecting power supply and load.

2. Circuit components

The basic ideal circuit elements are resistance elements, inductance elements and capacitance elements.

3. Line model

The circuit composed of some ideal circuit elements is the circuit model of the actual circuit.

4. Common electrical graphic symbols

Common electrical drawings include electrical schematic diagram, electrical component layout diagram and electrical installation wiring diagram.

The symbols in the electrical diagram mainly include text symbols, graphic symbols and loop labels.

5. The secondary side of voltage transformer should not be short-circuited at work. Because of short circuit, a large short circuit current will be generated, which may burn out the transformer. Therefore, both the primary side and the secondary side of the voltage transformer are equipped with fuses for protection.

6. One end of the secondary side of voltage transformer must be grounded. This is to prevent the primary high voltage from entering the secondary side when the insulation of the primary and secondary coils is broken down, endangering personal and equipment safety.

7. When the current transformer is working, the secondary side is close to short circuit. The rated current of the secondary coil is generally 5A.

8. The secondary side of current transformer shall not be open at work.

9. One end of the secondary side of the current transformer must be grounded to prevent the high voltage on the primary side from entering the secondary side when the primary and secondary coils are insulated and broken down.

10, be sure to pay attention to the correct and reliable wiring during installation, and the secondary side is not allowed to be connected with fuses or switches. Even if the instrument or other equipment on the secondary side is to be dismantled for some reason, the secondary side must be short-circuited first, and then dismantled.