Aluminum alloy cable is a new type of power cable with AA8030 series aluminum alloy material as the conductor and invented by advanced technologies such as special compaction process and annealing treatment.
Aluminum alloy cable
(铝.铜.铁.镁.稀土等元素) Aluminum alloy (aluminum, copper, iron, magnesium, rare earth and other elements)
Aluminum alloy cable is a very mature high-tech environmental protection and energy-saving green power cable, which is widely used in developed countries in Europe and America; for up to 40 years, it has occupied up to 90% of the market for power cables in developed countries in Europe and America. The aluminum alloy cable not only completely replaces traditional copper-core cables in terms of electrical performance and safety performance, but more importantly, it meets the same electrical performance and its cost is less than 50% of traditional copper-core cables, saving engineering investors. A large amount of investment cost for power facilities is in line with the development theme of building a conservation-oriented society in China. It is green, energy-saving, economical and environmentally friendly. In practical applications, aluminum alloy cables have only half the weight of copper-core cables under equivalent premise, and have good flexibility. (The bending radius is half smaller than that of copper cables. Copper cables have an outer diameter of 15 to 20 times, while alloy cables have a bending radius of only 7 to 8 times the outer diameter.) The installation is more labor-saving and labor-saving, the installation period is advanced, and the installation cost is also Then it is greatly reduced.
I. 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 rare earth and other chemical elements added to the aluminum alloy can increase the corrosion resistance of the 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
First, tensile strength and elongation. Compared with pure aluminum conductors, aluminum alloy conductors have added special components and adopted special processing technology, which greatly improves the tensile strength, and the elongation rate is increased to 30%, making it safer and more reliable to use.
Second, 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 specified in GB / T12706 “Minimum bending radius during cable installation”. -20 times the outer diameter of the cable.
Third, flexibility. As long as the pure aluminum cable is twisted a few times at a certain angle, the conductor will crack or break, which is easy to cause an accident. The aluminum alloy power cable can withstand dozens of bends, eliminating accidents that occurred during the installation and use of pure aluminum cables. Hidden dangers have greatly improved safety and reliability.
Third, the conductivity
Aluminum alloy conductor is an emerging conductor material formed by adding rare earth, magnesium, copper, iron and other elements to pure aluminum through an alloy process. As is known to all, after adding various other alloying elements to aluminum, the electrical conductivity will decrease, and through process control, the electrical conductivity can be restored to a level close to that of pure aluminum, so that it has a current carrying capacity similar to that of pure aluminum.
Fourth, creep resistance
Pure aluminum has poor creep resistance. The thermal expansion and contraction caused by power-on and power-off will cause large creepage at the connection. After a long time, relaxation will occur. Contact resistance will increase and cause overheating, which may cause 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 slack and improves the connection condition of the conductor.
Aluminum alloy cable adds alloy elements to electrical aluminum, and at the same time, through the process adjustment, the mechanical properties of aluminum alloy conductors are greatly improved, avoiding the problems of low elongation, poor creep resistance and poor flexibility of pure aluminum conductors, and increasing the cable system Connection reliability. In addition, the electrical performance of the aluminum alloy is maintained at the same level as the electrical aluminum conductor, which is above 61% IACS.
For the DC resistance assessment indicators of aluminum alloy electrical conductors, refer to the DC resistance values of solid conductors or stranded conductors in GB / T3956-2008 "Conductors for Cables".
Alloy power cables make up for the shortcomings of previous pure aluminum cables. Although the electrical conductivity of the cable has not been improved, the bending performance, creep resistance and corrosion resistance have been greatly improved, which can ensure that the cable will remain continuous during long-term overload and overheating. Stable performance. The use of AA-8000 series aluminum alloy conductors can greatly improve the electrical conductivity and high temperature resistance of aluminum alloy cables, and at the same time solve the problems of electrochemical corrosion and creep of pure aluminum conductors.
The conductivity of aluminum alloy is 61.8% of the most commonly used reference material copper IACS, and the current carrying capacity is 79% of copper, which is better than the standard of pure aluminum. But under the same volume, the actual weight of aluminum alloy is about one third of copper. . Therefore, the weight of an aluminum alloy cable is about half that of a copper cable at the same current carrying capacity. The use of aluminum alloy cables instead of copper cables can reduce cable weight, reduce installation costs, reduce wear on equipment and cables, and make installation easier.
On the premise of meeting the same electrical performance, the weight of the aluminum alloy cable is half that of the copper core cable, and its cross section is 1.1 to 1.25 times that of the traditional copper core cable, and the price is 15 to 30% lower than the traditional copper core cable.