Classification and characteristics of overhead cables

Generally, the core of bare wire is easily corroded when exposed to the atmospheric environment. Even BV wire, commonly known as “insulated wire”, its withstand voltage level is limited to low voltage, and it will age and crack within 5 years of outdoor erection, losing its original performance. Compared with bare conductors or other wires and cables, the most obvious feature of overhead insulated conductors is weather resistance.

1.Overhead insulated wire

It can withstand strong ultraviolet light and harsh climates such as rain, snow, hail, and sandstorms. It is resistant to high temperature and low temperature. It can effectively prevent the invasion of smoke, chemical gases, and frequent friction of tree trunks and branches. Therefore, overhead insulated wires can prolong the service life of the line. Keywords Overhead insulated conductors.

2.Steel core aluminum stranded wire

Compared with bare conductors or other wires and cables, the most obvious feature of overhead insulated conductors is weather resistance. It can withstand strong ultraviolet light and harsh climates such as rain, snow, hail, and sandstorms. It is resistant to high temperature and low temperature, and can effectively prevent the invasion of smoke, chemical gases, and frequent friction of tree trunks and branches. Therefore, overhead insulated wires can prolong the service life of the line.

3.Advantages of overhead cables

The advantages of overhead cables are mainly Simple structure, convenient installation, low investment, large transmission capacity, high voltage, good heat dissipation conditions and convenient maintenance. Not easily affected by the surrounding environment and pollution, high reliability. The insulation distance between lines is small, the area is small, and there is no interference wave. Floors and spaces are unsafe, secure and easily exposed.

4.Disadvantages of overhead cables

Miscellaneous and concentrated, it is not easy to build; it is unsafe to erect in densely populated urban areas, with unsightly appearance, poor working conditions, and easy to be affected by environmental conditions, ice, wind, rain, snow, temperature, chemical corrosion, lightning strikes, etc. The cost is high, and the one-time investment cost is relatively large. Cable routing. Not easy to change and branch. Cable fault detection and maintenance is difficult and requires personnel with high professional and technical level to operate.

5.Scope of application of overhead cables

In modern social life, where people usually live; all economic activities are produced and transported; all water on the earth needs exploration, development or any scientific and technological innovation research, which is inseparable from the application and transmission of electricity and electromagnetic waves. The generation, application and transmission of electricity and electromagnetic waves are inseparable from the wire and cable as the basic component of connection and transmission or winding material. Therefore, as the transmission medium of the power system, the wire and cable is like the function of the wire and cable in the blood vessels of the human body; the information system is like the nerve of the body; the electromagnetic wire winding coil used for electrical and instrumentation, urban and rural power supply, telephone, TV is stable and smooth efficient. Applications of computers and the Internet, automobiles, trains, airplanes, and even satellites, spacecraft, etc., must be suitable for wires and cables of various structures and properties.