What are the advantages and disadvantages of overhead lines and ...

Distribution lines are an important part of the power system. They can be divided into two categories according to the structure: overhead lines and cable lines. Overhead lines are placed on the tower and exposed to the air, which is laid underground or underwater.

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The advantage of the overhead line is that the structure is simple, the installation is convenient, the investment is small, the transmission capacity is large, the voltage is high, the heat dissipation condition is good, and the maintenance is convenient. The disadvantage is that it is not easy to erect when the network is complicated and concentrated; it is not safe and not beautiful in the densely populated areas of the city; it has poor working conditions and is vulnerable to environmental conditions such as ice, wind, rain, snow, temperature, chemical corrosion, lightning, etc. Impact.

Cable lines have the following advantages over overhead lines:

(1) It is not susceptible to the surrounding environment and pollution, and the power transmission reliability is high. (2) The insulation distance between the lines is small, the land occupation is small, and there is no interference radio wave. (3) When laying underground, it does not occupy the ground and space, it is safe and reliable, and it is not easy to expose the target.

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weakness is:

(1) High cost and relatively large one-time investment costs. (2) The cable line is not easy to change and branch. (3) It is difficult to find and repair cable faults, and it is necessary to operate with personnel with high professional skills.

The specialty of Overhead power line and Insulated electric cable

1. Overhead line: The cable is a non-insulated bare metal conductor. In the aerial, the insulator string is fixed in the tower, and the air is insulated. The main advantage: low cost. Its disadvantage is that it uses more land resources (line corridors), which affects the appearance of the city.

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