What Is a Line Function?
Lines , which can be translated into circuits in English, can refer to narrow roads, electric wires or railway tracks.
- Name: Line
- Basic explanation
- 1. [line; route]: a narrow road;
- xiàn lù
- Small
- Line refers to the communication line used by the MFP for faxing. In general, all-in-ones are telephone lines of the public telephone network used, but there are also a very small number of products, because confidentiality may require the use of special lines. according to
- Most of the power plants in the power system are built at the location of power resources. For example, hydropower plants are built at the point of hydropower resources, that is, concentrated in places where the water level of the river basin is large. Electric power load centers are mostly concentrated in industrial areas and large cities. Therefore, power plants and load centers are often far away, and the problem of power transmission has arisen. Power transmission lines need to be used for power transmission. Therefore, the transmission line is an important part of the power system, it is responsible for the task of transmitting and distributing electrical energy. Transmission lines are divided into overhead lines and cable lines. According to the nature of electrical energy, there are AC transmission lines and DC transmission lines.
- According to the voltage level, there are transmission lines and distribution lines. The voltage level of transmission lines is generally 35kV and above. At present, the voltage levels of transmission lines in China mainly include 35, 60, 110, 154, 220, 330kV, 500kV, 1000kV AC and ± 500kV, ± 800kV DC. Generally speaking, the larger the transmission capacity of the line, the longer the transmission distance, and the higher the required transmission voltage. The distribution line is responsible for the task of distributing electrical energy, which is called the distribution line. The voltage levels of distribution lines in China are 380 / 220V, 6kV, and 10kV.
- Overhead lines mainly refer to overhead open lines, which are erected on the ground, which are convenient to erection and maintenance, and low in cost, but are easily affected by weather and environment (such as high winds, lightning strikes, pollution, snow, etc.) and cause failures. At the same time, the entire transmission corridor Occupied land area is easy to cause electromagnetic interference to the surrounding environment. Power transmission cables are not affected by the weather and the environment. They are mainly erected through cable tunnels or cable trenches. The cost is high, and it is inconvenient to find faults and maintain them. Cable lines can be divided into overhead cable lines and underground cable lines. Cable lines are not susceptible to lightning strikes, natural disasters and external forces, and have high power supply reliability. However, cable manufacturing, construction, accident inspection and handling are difficult, and engineering costs are high. Long-distance transmission lines mostly use overhead transmission lines.
- The transmission capacity of a transmission line is the maximum transmission power determined after comprehensive consideration of various technical and economic factors. The transmission capacity is generally proportional to the square of the transmission voltage. Increasing the transmission voltage can increase the transmission capacity, reduce losses, and reduce metals. Consumption of materials to improve the utilization of transmission line corridors. EHV transmission is the main means to achieve large-capacity or long-distance transmission, and is also the main direction of the development of current transmission technology.
- The main components of overhead transmission lines are: conductors and lightning conductors (overhead ground lines), pole towers, insulators, metal fittings, pole tower foundations, pull wires and grounding devices.