Overhead ABC cable often appear in our sight. If you are on the highway, you will definitely see it. It is a cable installed on the tower or other methods.
Overhead cables are composed of two or two groups of transmission lines, and transmission lines are what we call cables.
The function of overhead cables: to transmit electric energy to various regions in an overhead manner, and finally to each household, providing electricity for people's daily life. Therefore, overhead cables are very important to us.
1.The power supply system has high reliability. The use of overhead cables can greatly reduce various short-circuit faults (especially the short-circuit faults common in bare overhead transmission lines). Compared with bare overhead transmission lines, the equipment failure rate is 4-6 times lower.
2.The power supply system has good safety factor. The use of overhead cables can greatly reduce the safety of personal electric shock accidents. When the overhead cables are connected to the power supply, when the body or other animals accidentally touch the surface of the cable insulation, as long as the cable is not penetrated, it will not cause adverse effects on people and animals.
3.Convenient installation and maintenance. Overhead cables can be installed on all types of towers, along walls, and in special cases, they can also be shuttled through the woods and fixed directly on the main pole with hardware.
4.Rationality and practicality. Although the use of overhead cables is more expensive than the use of bare overhead transmission lines, it is cheaper than ordinary underground installation cables. Therefore, its comprehensive engineering cost is obviously lower, more economical and more efficient.
Overhead cables have a variety of application scenarios, and their main advantages include low cost, convenient construction and maintenance, and good mobility. Specifically, they mainly include electrified railways, urban rail transit systems, trolleybuses, etc.
In electrified railway and urban rail transit system, overhead cables are supported by poles and erected in the air above the track of electric-driven vehicles. When they are in contact with them, they are used to directly supply power to them. This special form of transmission line is the key to the operation of these systems.
For systems using rubber wheels such as trolleybuses, the overhead contact network usually has two parallel contact wires, one positive and one negative, which are powered by two receiving poles and form a path to achieve electric drive.
Overhead insulated cables designed specifically for overhead transmission lines are preferred for 10kV transmission engineering lines for power grid construction and transformation, and have advantages in line maintenance and safety. The implementation standards of overhead insulated cables include 1KV and 10KV overhead insulated cables, which adopt the relevant standards of the International Electrotechnical Commission and are an important part of power grid construction.
In summary, overhead cables play an important role in the field of power transmission due to their unique advantages and diverse application scenarios. They not only improve the reliability and safety of power supply, but also facilitate installation and maintenance work and reduce overall costs.
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