[China Aluminium Network] increased the elongation rate to more than 25%, which greatly improved the bending performance. The smaller bending radius of the aluminum alloy cable installation is more than 7 times the cable diameter, which is far less than the smaller bending radius of the cable specified in GB12706-2008 "Extruded Insulated Power Cable with Rated Voltage of 1kV to 35kV and Accessories". 12-20 times the cable diameter.
Again, the aluminum alloy cable has a low resilience and is 40% smaller than the resilience of the copper cable, which facilitates construction and reduces construction risks. Creep resistance, special alloys and heat treatment processes of the aluminum alloy conductor greatly reduce the metal's “creep†under heat and pressure. Changing tendency, compared with pure aluminum, the creep resistance is improved by 300%; high flame retardancy, aluminum alloy chain interlocking armoured cable is made of aluminum alloy conductor, flame-retardant silane cross-linked polyethylene insulation, aluminum alloy chain interlocking armoring Structure, able to achieve flame-retardant IA grade, fire-resistant IA grade, and low-smoke halogen-free; aluminum alloy armored cable uses non-magnetic materials, even if there are three-phase Cangzhou Forum Penglai News Chongqing Forum Zaozhuang Forum Wuan Forum Shanxi Network Putianba Fenghua Forum Hubei Web Gansu.com Real Estate Network Ganzhou.com Food Recipe Lanzhou Forum Nanping Forum Children Education Film Network Hebei Network Anhui Network Jiangxi Network Xiamen Network Nanning Network Hefei Network Baotou Network Wuxi Network Taiyuan Network Guiyang Forum Nanchang Forum Suzhou Network Lanzhou Forum Kunming Network Jinan Forum Shijiazhuang Changchun News Net Tangshan Net Xi'an Net Wuhan Forum Nanjing Nets Lishui Information Harbor Jinhu Forum Unbalanced current, no eddy currents inside the cable, Less wear and tear line.
In addition, corrosion resistance is also a major advantage of highly conductive aluminum alloy cables. Aluminum rapidly forms an oxide film in the air with a thickness of about 2-4 μm. This layer of oxide film is so dense that air cannot enter, preventing further internal oxidation of the metal.
Later, the installation is simple. The highly conductive aluminum alloy cable is more like a metal conduit and cable integration than a copper cable. In practical applications, the work of wearing pipes is eliminated. In the design of electrical design, bridges can be omitted, the cost can be reduced, man-hours can be saved, the construction period can be shortened, materials can be saved, and pollution and energy waste can be reduced.
In general, aluminum alloys are lightweight and are equivalent to about 50% of the replacement copper cables. The length of aluminum alloy cables of the same quality is twice that of copper cables. For large-span buildings, 15% of the steel structure can be saved, and smaller. The additional load can increase the safety of the building itself. At present, aluminum alloy cable products have successfully completed the actual installation and use of nearly 500 projects in residences, star hotels, hospitals, theaters, convention centers, libraries, government agencies, financial centers, petrochemicals, airports, and ships. It has been widely used in subway, iron and steel smelting projects.
High-conductivity aluminum alloy cable is a new type of cable. Because of its special conductor formula and heat treatment process, the conductor material greatly reduces the tendency to creep due to heat and pressure, and the cable can maintain its thermal overload even for a long time. The stability of the connection; interlocking armored cable unique arch interlocking armored structure, superior dispersion lateral pressure performance. At the same time, it also has the advantages of fast heat dissipation, strong anti-corrosion, strong and tough, and easy to bend. The interior of the armor is smooth, it will not cut insulation, and it has perfect characteristics of excellent shielding and flame retardant.
In order to better analyze the technical performance of highly conductive aluminum cables, this article elaborates on the following dozens of aspects, in order to let people in the industry have a deeper understanding of high-conductivity aluminum alloy cables and apply them to project practice.
First of all, it should be clear that a major advantage of high-conductivity aluminum alloy cables is that the loss of power during transmission depends on the conductor resistance rather than the resistivity. Compared to copper conductors, aluminum conductors have a high resistivity. Many people have come to the conclusion that aluminum conductor cables have large losses during power transmission. It is unscientific to conclude that aluminum has a greater loss than copper.
In the case of the same current carrying capacity, the cross section of the aluminum alloy conductor is 1.5 times that of the copper core cable: GB/T3956-2008 “Conductors of Cables†stipulates that, at 20°C, the DC resistance value of a copper conductor cross section corresponds to another Specifications of aluminum conductor DC resistance value is equivalent; a specification of copper conductor core power cable can be replaced by a DC resistance equivalent aluminum conductor cable, this time the aluminum cable's ampacity is greater than the copper cable's ampacity; in the case of the same cross-section length Below, conductivity is 61% of copper, and the current-carrying capacity is about 78% of copper. According to the distribution of cable cross-sections, the cross-section of the aluminum alloy cable is increased by about 1.5 times, and the electrical parameters such as the ampacity and voltage are equivalent to copper.
Under the same current-carrying capacity, the diameter of the aluminum alloy conductor is about 1.2 times that of the copper core conductor. Then, does the increase of the conductor diameter affect the installation? Firstly, the aluminum alloy cable diameter factor can be considered in the design; secondly, the conductor is used in the manufacture. Pressing technology, compression coefficient reached 0.93, so that the outer diameter of aluminum alloy cable is only increased by about 10% compared to the copper core cable, reducing the diameter factor to a smaller one.
When the equivalent section length is the same, the weight of the aluminum alloy conductor is 50% of the copper core conductor: Since the difference between the two is larger, even if the aluminum alloy section increases, the weight of the conductor can be reduced because of the smaller specific gravity.
Secondly, high-conductivity aluminum alloy cable joints perform well, greatly improving the toughness and high creep resistance after annealing. In practice, if the copper and aluminum are directly connected and contacted, there is a potential difference and electrochemical corrosion may occur even in moist air. In the power system, this kind of corrosion will increase the contact resistance, make the junction heat, and make the system run safely. Copper-aluminum joints manufactured using new technologies now fundamentally eliminate the fatal deficiency of copper and aluminum joints in the past, making the joints of aluminum alloy cables safe and reliable, and the operation is simple and convenient.
Mechanical properties have also been improved: due to the addition of alloying elements such as iron, copper, and rare earth elements in pure aluminum, the overall performance of the aluminum alloy is improved, and the elongation and creep properties are improved. At the same time, alloying also increases the tensile strength of the aluminum alloy.
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