What are the advantages of aluminum alloy cables over ordinary cables?
1. Electrical conductivity: The electrical conductivity of aluminum alloy is 61.5% of the most commonly used benchmark material copper IACS, and the current 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. Compared with pure aluminum, the creep resistance is improved by 300%, which avoids the occurrence of cold flow. or relaxation problems caused by creep.
3. Tensile strength and elongation: Compared with pure aluminum conductors, aluminum alloy conductors greatly improve the tensile strength and elongation to 30% due to the addition of special components and the use of special processing technology. 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 coefficient of thermal expansion comparable to copper, 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 cable can support 4,000 meters of self-weight, and copper cable can only support 2,750 meters. This advantage is particularly prominent when wiring large-span buildings (such as stadiums).
6. Anti-corrosion properties The inherent anti-corrosion properties of aluminum originate from the formation of a thin and strong oxide layer when the aluminum surface is in contact with 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 makes it widely used as conductors for cables in trays, as well as in many industrial components and containers. Corrosion is usually associated with the joining of dissimilar metals in wet environments. Corresponding protective measures can be used to prevent corrosion, such as the use of lubricants, antioxidants and protective coatings. Alkaline soils and some types of acidic soil environments are highly corrosive to aluminum, so aluminum conductors laid directly in burial should be insulated or jacketed to prevent corrosion. In sulfur-containing environments, such as railway tunnels and other similar places, the corrosion resistance of aluminum alloys is much better than that of copper.
7. Flexibility Aluminum alloy has good bending properties, and its unique alloy formula and processing technology greatly improve the flexibility. Aluminum alloys are 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, making it easier to connect terminals.
8. Armored characteristics Most of the armored cables commonly used in China are armored with steel tapes, which have a low safety level. When they are subjected to external destructive forces, their resistance is poor, which is easy to cause breakdown, and the weight is heavy and the installation cost is quite high. The corrosion resistance is poor and the service life is not long. The metal interlocking armored cable developed by us according to the American standard adopts aluminum alloy tape interlocking armor, and the interlocking structure between the layers ensures that the cable can withstand the strong destructive force of the outside world, even if the cable is subjected to greater pressure and 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 resistance level of the cable and reduces the risk factor of fire. Compared with steel tape armor, the aluminum alloy tape armored structure is light in weight, convenient for laying, and can be installed without bridge, which can reduce the installation cost 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. The compaction characteristics are only considered in terms of volume conductivity. Aluminum alloy is not as good as copper, but the conductors we developed have not only made improvements in material properties, but also made great breakthroughs in technology. We use unconventional compaction technology. , so that the compression coefficient reaches 0.93, and the compression 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, make the stranded conductor core like a solid conductor, significantly reduce the outer diameter of the core, and improve the electrical conductivity. The outer diameter is only 10% larger than that of copper cables.