Translation


+86-371-67829333

消息

Why can’t High Voltage Cables be Buried Underground?

high-voltage cables

The current underground cables are generally of lower voltage level, and the line transmission with 高压 level is often overhead, which is mainly due to cost and technical factors.​​

Ultra-high voltage power transmission refers to the use of 500kV-1000kV voltage level to transmit electric energy. If the 220 kV transmission index is 100%, the relative investment per kilometer of ultra-high voltage transmission, the relative cost of 100 kilometers per kilowatt-hour transmission, and the consumption of metal materials will all be greatly reduced, and the utilization rate of the line corridor will be significantly reduced. In daily life, we can often see overhead ultra-high voltage power transmission projects.

Hardly Laying of High-voltage Cables
The structure of underground cables is more complicated than that of overhead lines, the technical requirements are higher, and the manufacturing and construction are difficult. Additionaly, the cables are buried underground, so it is not easy to find faults, and it is also difficult to repair and maintain. In terms of cost, the cost of underground cables of the same voltage level is generally 3 到 5 times higher than that of overhead lines.​​

尤其, our common high-voltage grade lines are often used for long-distance transmission. If underground cables are used, especially long-distance transmission often has to pass through complex terrain, the cost and technical requirements will increase linearly.​​

On the other hand, 架空线 have good heat dissipation conditions in the air, while the air around underground cables does not flow and it is difficult to dissipate heat, which limits the power level that can be transmitted by underground cables to a large extent. The important thing is that an effective insulating material cannot be found for the outer sheath of the wire for ultra-high voltage transmission. 所以, the ultra-high voltage wires are exposed and cannot be buried in the ground.

Cost of Understand Cables
Air is an insulator, but the earth is a conductor. In the air, you only need to put the wires directly there, but in the ground, you need to add layers of insulating casings to the wires, otherwise the electricity in the wires will not go far, and there will be little leakage left. The structure of underground cables is more complicated than that of overhead lines, the technical requirements are higher, and the manufacturing and construction are difficult. Then the cables are buried underground, so it is not easy to find faults, and it is also difficult to repair and maintain. 一般来说, the cost of underground cables of the same voltage level will be several times or even dozens of times that of high-voltage lines in the air.

Burying ultra-high voltage cables into the ground has both safety and economic problems. If there is a fault, the inspection and repair work of the cables is very huge and cannot stand the toss.

The insulation layer and protective layer of the conductor of the underground cable are very strict, and there is no danger for the human body to touch the outer sheath of the cable normally. The laying of cables is also very particular. Most of the cables are buried in special cable trenches, cable pipes or cable 隧道, which are well isolated and protected. 而且, every tens of meters on the ground where the cables are buried, there will be a cable work well or a cable marker pile as a sign to remind people to pay attention to safety. 所以, underground cables generally do not pose a danger to residents.

ZMS Cable F

Recent Posts

How Many Cores are the High Voltage Copper Cables Normally? What Are the Applications?

High voltage copper cables are essential components in the distribution and transmission of electrical power,…

2 weeks ago

铁路系统中使用的高压线路有哪些?

Railroad high voltage lines play a vital role in powering the railway systems that transport

1 month ago

单模和多模光纤电缆有什么区别?

光纤电缆是现代通信网络的关键组件, enabling high-speed data transmission over

1 month ago

工业应用中常用的控制电缆类型有哪些?

控制电缆是工业应用中的重要组成部分, 促进沟通, 信号传输, and control between

1 month ago

什么是热电偶电缆? 它们最常用于什么用途?

热电偶电缆是工业温度测量系统的重要组成部分. These cables are used to

2 months ago

什么是通信电路? 需要什么通讯电缆?

In today's interconnected world, the seamless transfer of information is the backbone of modern communication.

3 months ago