Why are more and more cables being placed underground?

When it comes to the laying of power cables, the first thing that comes to mind is underground laying, because laying on the ground not only increases the occurrence of accidents, but also affects the visual aesthetics. Therefore, by using underground laying, such as in transportation subways, underground drainage channels, etc., there are many advantages to burying power cables underground.

I. Understanding power cables 

Power cables include various insulated power cables used for transmitting and distributing electrical energy, suitable for various voltage levels of urban underground power grids, power plants, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas at 1-500KV and above. High-voltage power cables are mainly used to transmit and distribute high-power cable products. Power cables are divided into high-voltage cables, medium-voltage cables, and low-voltage cables, with generally thicker wire diameters and a relatively wide range of applications.

II. Why are power cables placed underground?

  1. It can enhance the reliability of urban power grids. Because power cables are exposed to the air, they are easily aged, and the insulation layer may fall off due to corrosion by acidic and alkaline gases and water vapor in the atmosphere, which makes overhead cables have many hidden dangers. Therefore, it is necessary and important to use overhead cable lines, and underground cables are a safer laying method.

  2. It can enhance the transmission capacity of cities. Usually, overhead lines are connected to another pole, but power cables buried underground can achieve many loops, and underground high-voltage cables generally have more efficient copper conductors, which make them more efficient in transmitting electrical energy.

  3. It can beautify the city environment and reduce visual pollution. The huge spiderweb-like overhead cables in cities largely destroy the aesthetics of the city and the visual effects of traditional and modern architecture. By burying overhead lines underground, it can bring purity to the city and create a comfortable visual feeling for people.

  4. It can increase the value of land use. Land is a high-value but relatively scarce resource, especially in the central locations of first-tier cities. Due to the safety distance required for overhead lines, which is higher than that of underground pipelines, the value of land use is reduced. However, by changing to underground laying, the value of land use can be increased.

  5. The use of underground power cables can better reduce dangerous accidents and avoid accidents related to power line poles that may endanger personal safety.