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What are the advantages of aluminum alloy cables over ordinary cables

1. Conductivity: The conductivity of aluminum alloy is 61.5% of that of copper IACS, the most commonly used reference material, and its carrying capacity is 79% of that of copper, which is better than the standard of pure aluminum.

2. Creep resistance: The alloy material and annealing process of the aluminum alloy conductor reduce the "creep" tendency of the conductor under heat and pressure. or creep-induced relaxation problems.

3. Tensile strength and elongation: Compared with pure aluminum conductors, aluminum alloy conductors have greatly improved tensile strength and elongation to 30% due to the addition of special components and special processing techniques. It is safer and more reliable to use.

4. Thermal expansion coefficient: The thermal expansion coefficient is used to calculate the dimensional change of the material when the temperature changes. Aluminum alloys have a thermal expansion coefficient comparable to copper, and aluminum connectors have been used reliably for copper and aluminum conductors for many years, and most electrical connectors in use today are made of aluminum, which is especially suitable for aluminum alloys. Therefore, the expansion and contraction of the aluminum alloy conductor and the connector are exactly the same.

5. Strong self-weight bearing capacity Aluminum alloy improves the tensile strength of pure aluminum. Aluminum alloy cables can support the self-weight of 4000 meters in length, while copper cables can only support 2750 meters. This advantage is especially prominent in the wiring of long-span buildings (such as stadiums).

6. Anti-corrosion performance The inherent anti-corrosion performance of aluminum comes from the formation of a thin and strong oxide layer when the aluminum surface is in contact with the air. This oxide layer is particularly resistant to various forms of corrosion. The rare earth elements added to the alloy can further improve the corrosion resistance of the aluminum alloy, especially the electrochemical corrosion. Aluminum's ability to withstand harsh environments has led to its widespread use as conductors for cables in trays, as well as many industrial components and containers. Corrosion is usually associated with the connection of dissimilar metals in wet environments and can be prevented by using appropriate protective measures such as lubricants, antioxidants and protective coatings. Alkaline soil and some types of acidic soil environment are highly corrosive to aluminum, so the aluminum conductors laid directly buried should use insulating layer or molded sheath to prevent corrosion. In sulfur-containing environments, such as railway tunnels and other similar places, aluminum alloys have much better corrosion resistance than copper.

7. Flexibility Aluminum alloy has good bending performance, and its unique alloy formula and processing technology greatly improve flexibility. Aluminum alloy is 30% more flexible than copper and 40% less resilient than copper. Generally, the bending radius of copper cables is 10 to 20 times the outer diameter, while the bending radius of aluminum alloy cables is only 7 times the outer diameter, which makes terminal connection easier.

8. Armoring characteristics Most of the armored cables commonly used in China are armored with steel tape, which has a low safety level. Corrosion resistance is poor and the service life is not long. The metal interlocking armored cable we developed according to American standards uses aluminum alloy tape interlocking armor, and the interlocking structure between layers ensures that the cable can withstand strong destructive forces from the outside, even if the cable is subjected to greater pressure And the impact force, the cable is not easy to be broken down, which improves the safety performance. At the same time, the armored structure isolates the cable from the outside world. Even in the event of a fire, the armored layer improves the flame-retardant and fire-resistant level of the cable and reduces the risk factor of fire. Compared with steel tape armoring, the aluminum alloy tape armored structure is light in weight, easy to lay, can avoid bridge installation, and can reduce installation costs by 20% to 40%. Different outer sheath layers can be selected according to different places of use, making the armored cable more widely used.

9. Compression characteristics In terms of volume conductivity alone, aluminum alloy is not as good as copper, but the conductors we developed not only improve material properties, but also make great breakthroughs in technology. We use ultra-conventional compression technology , so that the compaction coefficient reaches 0.93, while the compaction coefficient of the special-shaped line can reach 0.95, which is the first in China. Through the maximum compression, it can make up for the lack of volume conductivity of the aluminum alloy cable, so that the core of the stranded conductor is like a solid conductor, which obviously reduces the outer diameter of the core and improves the conductivity. The outer diameter is only 10% larger than that of copper cables.
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