Transmission and Distribution Lines - The Lines Used to Send Electricity

Transmission and distribution lines refer to the lines used to transmit electricity. Anti-salt spray corrosion measures for transmission and distribution lines For coastal areas, salt spray corrosion seriously affects the safe operation of transmission and distribution lines, shortens the service life of transmission and distribution lines, and increases the maintenance workload. 

For this reason, during the design process of rural power network transformation and urban network transformation, our county puts forward higher requirements for salt spray corrosion prevention of power transmission and distribution lines, from design to construction and maintenance of lines. Strengthen and improve the safety and reliability of power transmission and distribution lines It is related to the safety, stability and power supply reliability of the power grid, and it is related to the development of social economy and the economic benefits of power enterprises.

1. Introduction of distribution lines

The distribution line refers to the line that sends power from the step-down substation to the distribution transformer, or sends the power from the distribution substation to the power unit.

The transmission line is the line that transmits electric energy from the power plant to the power load center and the connection line between the power systems.

2. Introduction of transmission lines

The transmission line is realized by using a transformer to boost the electric energy generated by the generator, and then connecting it to the transmission line through control equipment such as a circuit breaker. The distribution line is erected between the substation and the substation, and the line that distributes electric energy from the power load center to each power user. Therefore, transmission or distribution lines cannot be distinguished by voltage level, only by their functions.

Whether it is a high-voltage power supply and distribution line or a low-voltage power supply and distribution line, the wiring methods and relationships of various electrical equipment need to be represented by circuit diagrams. When reading the power supply and distribution circuit diagram, it is necessary to know the main components and components in the high and low voltage power supply and distribution circuit, understand their functions, and be familiar with the meanings represented by the graphic symbols and text symbols marked in the diagram.

3. Introduction of transmission and distribution lines

Under normal circumstances, the connection relationship of power supply and distribution lines is relatively simple, and the direction of voltage or current transmission in the line is also relatively single. Basically, it is transmitted from top to bottom or from left to right according to the sequence relationship, and most of its components Components simply realize two states of on and off, without complex conversion, control and signal processing circuits.

High-voltage power supply and distribution lines are connected by various high-voltage power supply and distribution components and equipment. First, you need to know common high-voltage power supply and distribution equipment, understand its functions and their representation methods in the circuit diagram, and be able to The symbols in the figure identify various equipment names, and according to the functional characteristics of different equipment, understand the role it plays in the circuit, so as to understand the content expressed in the entire circuit diagram.