In our daily life, we can often see those high-voltage cables erected in the air in suburban fields. Have you ever considered why high-voltage cables should be arranged in this way? Isn't it more beautiful and safer to be buried underground?
In fact, many people may not pay attention. Overhead cable buried in the ground generally have a relatively low voltage level, while those with a relatively high voltage level choose the overhead method. The reason for this difference is due to cost and technical reasons.
Laying underground cables is much more complicated than overhead cables, with higher technical requirements and more difficult construction. For the same level of voltage, the cost of choosing underground cables is 3 to 5 times higher than choosing overhead cables.
High-voltage cables are generally used for long-distance transmission, often crossing rivers and mountains. If underground cables are used, both technology and cost must go up in a straight line.
There is also a very important point. There is no effective insulating material for UHV transmission. Therefore, UHV wires are exposed. Therefore, it is not feasible for such cables to be buried in the ground because of potential safety hazards. The choice of Aerial bundle cable can solve this problem well, and air is the best insulator.
The insulation and protective layers of the common underground cables in the city have very strict requirements, and there will be no danger to life in normal direct contact with the human body.
And the laying of cables is also very particular. Generally, there are special cable trenches for burying cables, tunnels or pipes are also used for burying, the depth is generally required to be less than half a meter, according to the voltage level of the cable, the higher the voltage is generally The deeper the burial, if the burial is too shallow, there may be a risk of being affected by the environment or being struck by lightning. We can often see the signs of cable piles on the ground, so underground cables will basically not affect people’s lives and safety.