Since the main material of aluminum alloy conductors is aluminum and its physical properties are very close to aluminum, it can be determined that aluminum alloy conductors are a type of aluminum conductors. In addition to conventional steel strip and steel wire armored structures, aluminum alloy cables also introduce the aluminum alloy strip interlocking armored structure in North American standards, which reduces the bending radius and improves construction performance. Moreover, this kind of interlocking armor can ensure that the electric energy can withstand the powerful destructive force from the outside world. Even if it encounters a large external force impact, the cable will not be easily broken down, which improves the safety performance.
The corrosion resistance of pure aluminum is better than that of copper, but the corrosion resistance of aluminum alloy is better than that of pure aluminum, because the rare earth and other chemical elements added to the aluminum alloy can increase the corrosion resistance of the aluminum alloy, especially the resistance to electrochemical corrosion. It solves the problem of electrochemical corrosion that occurs at the joints of pure aluminum for a long time.
Compared with pure aluminum conductors, aluminum alloy conductors have greatly improved tensile strength and elongation to 30% due to the addition of special ingredients and the adoption of special processing techniques, making them safer and more reliable to use.
The bending performance of aluminum core cables is very poor, and it is easy to break when bent. The bending radius of aluminum alloy power cables is 7 times the outer diameter of the cable, which is far better than the 10 specified in GB/T12706 "Minimum bending radius during cable installation" Times - 20 times the outer diameter of the cable.
As long as a pure aluminum cable is twisted at a certain angle a few times, the conductor will crack or break, which can easily cause accidents. However, aluminum alloy power cables can withstand dozens of bends, eliminating the possibility of accidents during the installation and use of pure aluminum cables in the past. hidden dangers, greatly improving safety and reliability.
Aluminum alloy conductors are emerging conductor materials formed by adding rare earth, magnesium, copper, iron and other elements to pure aluminum and forming them through an alloy process. As we all know, after adding various other alloying elements to aluminum, the electrical conductivity will decrease. However, through process control, the electrical conductivity can be restored to a level close to that of pure aluminum, so that it has a carrying capacity similar to that of pure aluminum.
Pure aluminum has poor creep resistance. The thermal expansion and contraction caused by power on and off will cause a large amount of creep at the connection, which will cause relaxation after a long time. The contact resistance will increase, causing overheating and easily causing accidents. The creep resistance of AA8000 series aluminum alloy is 300% that of pure aluminum conductors, which greatly reduces the possibility of cable joint loosening and improves the connection condition of conductors.
Compared with pure aluminum conductors, the tensile strength of aluminum alloy cable conductors is greatly improved, making it safer and more reliable to use. Therefore, aluminum alloy cables have gradually become the cable type used for urban short-distance circuit transmission.
Advantages of overhead aluminum alloy cables:
There is an insulation layer on the outside of the overhead aluminum alloy conductor, which will greatly reduce the occurrence of various short circuit faults. When the cable is powered on, when the body or animals come into contact with the surface of the cable, it is a traditional cable and will not cause adverse effects on humans and animals.
Aerial aluminum alloy cables are mainly laid on tower poles and along walls to facilitate normal and fault maintenance.
Taking into account the project cost, overhead aluminum alloy cables are cheaper than underground installation cables.
At present, many projects will use aluminum alloy cables to replace copper cables, which can reduce the weight of the cables, reduce installation costs, reduce the wear and tear of equipment and cables, and make the installation work easier, but the service life is not as good as copper cables.
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