Aluminum alloy power cable refers to the 8000 series aluminum alloy material in ASTM 800-05 (R2011) standard. The conductor material is added to the aluminum alloy according to the formulation requirements of AA8000 series conductor aluminum alloy. Process technology smelting, continuous casting and rolling process, the electrical properties of aluminum alloy conductors maintain the excellent performance of pure aluminum, mechanical properties are greatly improved, completely solved the low elongation of pure aluminum conductor, poor tensile strength, resistance to creep Variable performance, corrosion resistance, poor flexibility and other issues ensure the long-term safe operation of the cable. The advent of conductor aluminum alloys is a major technological breakthrough in cable conductor materials, triggering a revolution in conductor materials.
The aluminum alloy cable has been put into use since 1968. Under the joint action of aluminum alloy connectors for aluminum alloy cables, it has created a successful application history of safe and accident-free operation for nearly 50 years in countries such as North America.
North American mature aluminum alloy cable technology and products have entered the Chinese market. After nearly eight years of conflict, questioning, understanding and acceptance, they have formed an emerging cable industry in China. The aluminum alloy cable market is developing rapidly. The market prospects are enticing. Some experts predict that in the next five years, China's aluminum alloy cable market will form a market scale of more than 300 billion yuan. This is considered to be the "gold mine" to be developed in the Chinese cable market.
However, everyone's attention and interest seem to focus only on the many advantages and values of the aluminum alloy cable itself, but they ignore one of the most important problems, that is, the safety of the cable connection. It is well known that the operational safety of cables is usually found in the connection of cables.
The domestic promotion of aluminum alloy cables is basically to give customers a strong emphasis on the successful application history of aluminum alloy cable safety and accident-free operation in North America and other countries for nearly 50 years, and never explain to customers that North American countries use aluminum alloy cables. It is an important fact that the aluminum alloy connector for aluminum alloy cable is also used at the same time. Why do aluminum alloy cable manufacturers or distributors deliberately avoid or intentionally conceal the problems of supporting terminals and accessories? Let us uncover the truth of the problem.
If the aluminum alloy cable is used safely and without hidden danger, it must face and seriously solve the problem of the connection technology of the aluminum alloy cable and the supporting connection products. The correct connection scheme is: First, the application of aluminum alloy cable should use the same chemical composition as the connected aluminum alloy cable, and the aluminum alloy copper special connector with the same performance as electrical, physical, mechanical and compressive creep. In this way, the performance of the aluminum alloy cable and the connector is the same, in order to achieve a perfect connection, and truly realize the advantages and value of using the aluminum alloy cable. Secondly, the special aluminum alloy copper connecting terminal is used to connect the copper connecting end of the terminal device, and the connection size and electrical performance should be completely matched with the size and performance of the connecting terminal device, and the multi-way transfer of the bronze medal is no longer needed. Ensure a secure connection to the terminal. In this way, the safety hazard caused by the brutal construction such as the terminal connection surface can be eliminated due to the inability of the terminal to match the terminal. Then, the special aluminum alloy copper connecting terminal and other accessories, the inner diameter of the aluminum alloy end of the aluminum alloy cable is matched with the outer diameter of the cable conductor to reduce the pressure requirement of the crimping tool. The outer diameter of the terminal is matched with the traditional crimping copper cable tool. The engineering construction no longer uses the aluminum alloy cable crimping special tool, and the copper crimping tool is directly used. It is as convenient and reliable as the copper crimping, and is convenient for standard construction. Improve the quality of cable connection construction.
At present, the current status of domestic aluminum alloy cables in application is: before the lack of aluminum alloy cable technology and products, there is no corresponding connection technology and supporting products. Moreover, because the aluminum alloy cable manufacturer itself is unable to carry out research on the connection technology and connector related to the aluminum alloy cable, and even when the aluminum alloy cable is promoted and applied in China, it is well known, but the copper originally used for the aluminum cable is still used. The aluminum transition terminal acts as a connector for the wrong connection solution for the connection of aluminum alloy cables. The aluminum alloy cable was first introduced, and it is a new product. The user is not sure that there should be a special connector for the aluminum alloy cable. Since then, the application of the domestic aluminum alloy cable has extended this unscientific and incorrect error in the cable connection. The connection solution leaves a safety hazard for the application of aluminum alloy cables.
Why is the use of copper-aluminum transitions and other so-called alloy connector connections that are inconsistent with the performance of aluminum alloy cables that are unscientific, erroneous, and leave a safety hazard? As a simple example, we can understand that it is well known that the conductor aluminum alloy fundamentally improves the physical and mechanical properties of aluminum as a conductor, completely solving the aluminum conductor for medium and low voltage distribution power transmission, and the connection joint is aluminum. Comprehensive reasons such as mechanical and compressive creep resistance have caused frequent accidents and serious safety problems. Nowadays, in the copper-aluminum terminal of the connection of the aluminum alloy cable, the problem of all the defects caused by the aluminum still exists due to the presence of aluminum. What is the difference between this connection scheme and the direct use of the aluminum cable? So, what are the advantages and values of using aluminum alloy cables? There are also other so-called alloy connector connection schemes that are inconsistent with the performance of aluminum alloy cables, because the alloy of this so-called alloy connector is connected to the aluminum in terms of chemical composition, electrical properties, mechanical properties, and particularly compressive creep properties. The performance of alloy cables is inconsistent and does not match. What will be the result of this connection scheme? I will not start one by one.