1. What is an overhead cable?
An overhead cable is a cable that is erected on supports such as poles and towers and is used for transmitting power, information, and so on.
2. What types of overhead cables exist?
According to the material, there are overhead cables with conductor materials like aluminum strand, aluminum conductor steel reinforced, and aluminum alloy strand. Based on the insulation type, there are ordinary overhead insulated cables and cross-linked polyethylene insulated overhead cables.
3. For which scenarios are overhead cables suitable?
They are widely used in power transmission and distribution in urban and rural areas as well as in communication line erection and other scenarios. For instance, in rural power grid renovation and on both sides of urban streets for power and communication line laying.
4. Compared to underground cables, what advantages do overhead cables have?
The installation cost is relatively low as there is no need for extensive underground excavation work. Maintenance and repair are convenient as workers can operate directly on the overhead line. Additionally, the heat dissipation condition is good, which is beneficial for the stable operation of the cable.
5. What precautions should be taken when installing overhead cables?
During installation, ensure the stability of poles or towers. The erection height of the cable should comply with safety standards. The sag (i.e., the degree of sagging of the cable between two support points) of the cable should be controlled within a reasonable range to avoid affecting the normal use of the cable due to excessive or insufficient sag. When crossing special sections such as roads and rivers, corresponding protective measures should be taken.
6. How can one choose the appropriate overhead cable?
Select according to factors such as the voltage level, current magnitude, and environmental conditions of the usage scenario. For example, in strong wind areas, choose cables with strong wind resistance. In high-temperature environments, select cables with high temperature resistance.
7. What is the service life of an overhead cable?
Generally speaking, under normal use and maintenance, the service life of an overhead cable can reach more than 20 years. However, the specific life will also be affected by various factors such as cable quality, environmental factors, and usage frequency.
8. How is daily maintenance of overhead cables performed?
Regularly inspect the cable to check whether its appearance is damaged or deformed. Check whether the connection parts of the cable are firm and if there are phenomena such as loosening and heating. Clean the dust and debris on the cable to avoid affecting its heat dissipation and insulation performance.
9. What faults may occur in overhead cables?
Common faults include cable breakage, which may be caused by external forces or overload. Cable insulation damage may be due to long-term exposure to the external environment and being eroded by ultraviolet rays, rain, etc., or the aging of the insulation material inside the cable. Cable joint faults, such as loose joints and heating, may be problems that occur due to improper installation or long-term use.
10. When a fault occurs in an overhead cable, how is rapid repair carried out?
First, determine the location and type of the fault. Then, take corresponding repair measures according to the specific situation. For example, for a broken cable, the cable needs to be reconnected. For insulation damage faults, the damaged cable section needs to be replaced or insulation repair needs to be carried out. During the repair process, ensure the safety of workers and strictly abide by relevant safety operation procedures.
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