Performance difference between aluminum alloy cable and aluminum core cable

There are some differences between the performance of aluminum alloy cable and aluminum core cable, where are the differences? We analyze the corrosion resistance, mechanical properties, electrical conductivity, creep resistance and other four aspects.
1. 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 the chemical elements such as rare earth added to aluminum alloy can increase the corrosion resistance of aluminum alloy, especially the electrochemical corrosion resistance, which solves the problem of electrochemical corrosion of pure aluminum in the joint for a long time.
II. Mechanical Performance
1. Tensile strength and elongation. Compared with pure aluminum conductors, aluminum alloy conductors greatly improve the tensile strength due to the addition of special components and the use of special processing technology, and the elongation is increased to 30%, which is more safe and reliable to use.
2. Bending performance. The bending performance of aluminum core cable is very poor, and it is easy to break when bending. The bending radius of aluminum alloy power cable is 7 times the outer diameter of the cable, which is far better than the "minimum bending radius of cable installation" in GB/T 12706-2020.
3. Flexible performance. Pure aluminum cable as long as a few times a certain angle of torsion, the conductor will be cracked or broken, easy to cause accidents, and aluminum alloy power cable can withstand dozens of times of bending, eliminating the past pure aluminum cable installation and use of the process of the accident hidden danger, greatly improve the safety and reliability.
3. conductivity
Aluminum alloy conductor is a new conductor material formed by adding rare earth, magnesium, copper, iron and other elements to pure aluminum. As we all know, after adding other alloying elements to aluminum, the conductivity will decrease, and through process control, the conductivity can be restored to a level close to pure aluminum, so that it has a similar current carrying capacity with pure aluminum.
creep resistance of 4.
Pure aluminum has poor creep resistance. The thermal expansion and contraction caused by power-on and power-off will cause a large amount of creep at the connection. After a long time, there will be relaxation, which will increase the contact resistance and cause overheating, causing safety accidents. The creep resistance of AA8000 series aluminum alloy is 300 of that of pure aluminum conductor, which greatly reduces the possibility of cable joint relaxation and improves the connection condition of conductor.
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