Company: Henan Lubao Special Cable Co., Ltd.
Contact: Manager Su
Address: No. 13 Workshop B, Tiantan Venture Park, Huling Industrial Gathering District, Jiyuan, Henan
Replace the role of copper wire and steel core aluminum stranded wire in the cable industry
Basic knowledge of aluminum alloy cable
With the support of the country and the efforts of enterprises, the application of aluminum alloy cables has been greatly strengthened. In the near future, aluminum alloy cables will definitely occupy a pivotal position in China's construction and power applications.
I. Core compression factor-There are certain differences between the aluminum alloy cable and the traditional power cable in terms of process structure and auxiliary materials. The aluminum alloy conductor uses aluminum alloy monofilament compaction and stranding, and its core compression factor has reached 97%, the conductor is very dense, and the traditional copper core cable, aluminum core cable can be clearly seen on the cross section of the conductor. In the traditional cable manufacturing process, the compression factor of the core can only reach about 82%.
Second, the flexibility-aluminum alloy cable is controlled by ASTM-B800 electrician with 8000 series aluminum alloy wire, adding a suitable amount of copper, iron, magnesium and other rare-earth aluminum intermediate alloy materials developed by a special synthetic annealing process Environmentally-friendly and energy-saving power cables have extremely flexible conductors. This super-flexibility can ensure the safety performance of aluminum alloy cables in practical applications reaches or even exceeds copper-core cables. Big advantage. In the actual inspection and judgment, the direct hand-folding test can obtain the aluminum alloy conductor is very flexible. It can be repeatedly folded or repeatedly wound like a rope. The aluminum alloy monofilament is violently folded. Fracture phenomenon, while ordinary aluminum core monofilaments are usually folded three times and cracks must occur. Five times, an important disadvantage of ordinary aluminum wires is high brittleness. As long as it is twisted at a certain angle during installation, the conductor will crack. The crack will generate heat and corrosion, which is an important cause of fire. It is also a fatal reason that it cannot be widely used.
III. Cable structure—Aluminum alloy cable cores are tightly laminated. The conductor cross section is a round core (traditional cable cores are used in multiple sectors). The insulation uses three-color co-extruded cross-linked polyethylene insulation technology. The cores are arranged regularly. , The whole cable is round and flexible.
4. Luminous wire core—Aluminum alloy conductors are optimized for the results of conductor crystals due to the addition of rare-earth alloy materials during the smelting process. The cross-section of the wire core is bright and bright, with high brightness, which has obvious sensory differences from traditional aluminum core cables. The creep properties of the variable-performance alloy conductor are basically the same as those of the copper core conductor. It is known through experiments that the yield strength of copper is 6.0, that of the alloy conductor is 54, which is basically the same as that of the copper conductor, and is 300% of that of the aluminum core conductor. Elongation is an important indicator of the mechanical properties of the conductor, and an important indicator of the strength of the product and its ability to withstand external forces. It is also an important index for testing the mechanical properties of cable conductors. The elongation of aluminum alloy cables after annealing can reach 30%, while the elongation of copper cables is 30%, and the elongation of ordinary aluminum rods is 15%, which is an important indicator that can replace copper cables.
Seven, tensile strength-aluminum alloy conductor is only half of the copper conductor, because the density of aluminum alloy is only 30.4% of the copper conductor, so even under the premise of the same electrical performance, even if the cross-sectional area of the aluminum alloy conductor is increased to 150 %, The weight of the aluminum alloy conductor is also only 45% of the copper conductor, which makes the tensile strength of the aluminum alloy conductor have certain advantages over the copper conductor. In long-span power engineering, due to its specific gravity advantage, its tensile strength advantage is particularly prominent under the premise of equivalent. Not only save a lot of bridges, reduce the labor intensity of the installation engineer, at the same time speed up the installation process, save construction time, and greatly reduce the overall installation cost.
Anti-corrosion performance——Aluminum alloy conductor itself has excellent anti-corrosion performance. The good anti-corrosion performance of aluminum alloy conductor is derived from the inherent anti-corrosion characteristics of aluminum material. When the surface is in contact with air, a layer will be formed immediately. 2 ～ 4μm dense oxide film, this layer is very dense, especially resistant to various forms of corrosion, so it has the characteristics of withstanding the harshest environment, and its actual service life is longer than copper cables by more than 10 years. However, the current use of alloy cables in China is not long, that is, 3 to 5 years, so the actual service life can not be verified from the domestic, only the actual use in foreign countries can be referred to. In years, his actual service life is more durable than copper cables.