What are the differences between the performance of aluminum alloy cables and aluminum core cables
The performance of aluminum alloy cables and aluminum core cables are different. There are four aspects of corrosion resistance, mechanical properties, electrical conductivity, and creep resistance.
Pure aluminum has better corrosion resistance than copper, but aluminum alloy has better corrosion resistance than pure aluminum, because the rare earth and other chemical elements added to aluminum alloy can increase the corrosion resistance of aluminum alloy, especially the electrochemical corrosion resistance. Solve the problem of electrochemical corrosion of pure aluminum at the joint for a long time.
Second, mechanical properties
1. Tensile strength and elongation. Compared with pure aluminum conductors, aluminum alloy conductors, due to the addition of special components and the use of special processing techniques, have greatly improved the tensile strength, and the elongation rate has been increased to 30%, which is safer and more reliable.
2. Bending performance. The bending performance of the aluminum core cable is very poor, and the bending is easy to break. The bending radius of the aluminum alloy power cable is 7 times the outer diameter of the cable, which is far better than the 10 in GB/T12706 “Minimum bending radius during cable installation”. Times -20 times the outer diameter of the cable.
3. Flexible performance. As long as the pure aluminum cable is twisted at a certain angle a few times, the conductor will crack or break, which is easy to cause accidents, and the aluminum alloy power cable can withstand dozens of bends, eliminating the accidents that occurred during the installation and use of pure aluminum cables in the past Hidden dangers have greatly improved safety and reliability.
Aluminum alloy conductor is an emerging conductor material formed by alloying process by adding rare earth, magnesium, copper, iron and other elements to pure aluminum. As we all know, after adding other kinds of alloying elements to aluminum, the conductivity will be reduced, and through the process control, the conductivity can be restored to the level close to pure aluminum, so that it has a similar current carrying capacity as pure aluminum.
Fourth, creep resistance
Pure aluminum has poor creep resistance. The thermal expansion and contraction caused by power on and off will cause a large creep at the connection, and it will relax after a long time. The contact resistance will increase and cause overheating, which may easily cause accidents. The creep resistance of AA8000 series aluminum alloy is 300% of the pure aluminum conductor, which greatly reduces the possibility of cable joint slack and improves the connection status of the conductor.