What are the main properties of aluminum alloy cables?

Aluminum alloy power cable is a new material power cable with aluminum alloy material as the conductor, special roll forming, stranding production process and annealing treatment. Alloy power cables make up for the shortcomings of pure aluminum cables in the past. Although the electrical conductivity of the cables has not been improved, the bending performance, creep resistance and corrosion resistance have been greatly improved, which can ensure that the cables maintain continuous performance when overloaded and overheated for a long time Stable, the use of aluminum alloy conductors can greatly improve the conductivity and high temperature resistance of aluminum alloy cables, and at the same time solve the problems of pure aluminum conductors and creep.

Corrosion resistance

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 chemical elements such as rare earths added to aluminum alloy can increase the corrosion resistance of aluminum alloy, especially the resistance to electrochemical corrosion. It solves the problem of electrochemical corrosion of pure aluminum at joints for a long time.

Mechanical behavior

1.Tensile strength and elongation. Compared with pure aluminum conductors, due to the addition of special components and the use of special processing technology, the tensile strength of aluminum alloy conductors is greatly improved, and the elongation rate is increased to 30%, making it safer and more reliable to use.

2.Bending properties. The bending performance of the aluminum core cable is very poor, and it is easy to break when it is bent. The bending radius of the aluminum alloy power cable is 7 times the outer diameter of the cable, which is far better than the specified 10-20 times the outer diameter of the cable.

3.Flexibility. As long as the pure aluminum cable is twisted at a certain angle several times, the conductor will crack or break, which is easy to cause accidents, while the aluminum alloy power cable can withstand dozens of times of bending, eliminating the possibility of accidents during the installation and use of pure aluminum cables in the past. Hidden dangers, greatly improving the safety and reliability performance.

Conductivity

Aluminum alloy conductor is a new conductor material formed by adding rare earth, magnesium, copper, iron and other elements to pure aluminum through alloying process. As we all know, the electrical conductivity will decrease after adding various other alloying elements to aluminum, but through process control, the electrical conductivity can be restored to a level close to that of pure aluminum, so that it has a similar current carrying capacity to pure aluminum.

Creep resistance

Pure aluminum has poor creep resistance. Thermal expansion and contraction caused by power-on and power-off will cause a large amount of creep at the joint, and relaxation will occur after a long time, and the contact resistance will increase, causing overheating and accidents. The creep resistance of AA8000 series aluminum alloy is 300% of that of pure aluminum conductors, which greatly reduces the possibility of cable joint loosening and improves the connection condition of conductors

Comparison of aluminum alloy cables and copper core and aluminum core cables:

1.Compared with copper core cables and aluminum core cables, aluminum alloy cables are superior to aluminum core cables in terms of conductivity, and better than copper core cables in terms of weight. Experiments have proved that in terms of conductivity, the conductivity of aluminum core cables is about 66% of that of copper core cables, and that of aluminum alloy cables is about 80% of that of copper core cables. It can be seen that the conductivity of aluminum alloy cables is not as good as that of copper core cables. cable, but it is far superior to aluminum core cables. In terms of weight, experiments have proved that under the premise of the same electrical performance, the weight of aluminum alloy cables is about 50% of that of copper core cables. Therefore, considering comprehensively, aluminum alloy cables can completely replace aluminum core cables. Compared with copper core cables, they can effectively reduce the weight of cables and have great advantages in reducing costs.

2.Compared with copper core cables and aluminum core cables, aluminum alloy cables are more reliable in terms of creep resistance, tensile strength and elongation. Aluminum core cables and copper core cables generally experience different degrees of creep under heat or pressure, resulting in cable relaxation, while aluminum alloy cables have been annealed and will not experience large creep. has an advantage.

3.Aluminum alloy cables are more reliable in terms of corrosion resistance and flame retardancy. AA8000 series aluminum alloys are made by adding rare earths, which are far superior to pure metals in terms of corrosion and flame retardancy. At present, aluminum alloy cables have been used in the United States for more than 40 years. Since the application, there has never been a situation where aluminum alloy cables have been corroded and caught fire. It can be seen that the aluminum alloy cable is quite reliable in terms of safety.