As a heavy material and light industry, the wire and cable industry has great demand for materials and high requirements, especially for copper. However, due to the relatively high price and uneven quality of copper materials, China's wire and cable industry has been seeking a new type of substitute for many years to reduce production costs on the basis of ensuring that product performance does not decrease. It is precisely because of this that in recent years, there have been rising calls for "saving copper with aluminum" and "substituting aluminum for copper". The same is true that aluminum alloy cables have attracted a lot of attention from the development, production to the market. And more and more large-scale cable manufacturers in China have begun to increase R&D costs and actively enter the aluminum alloy cable market.
Obviously, in Western countries, aluminum alloy cable products are nothing new, but the application in China is undoubtedly relatively new, especially the aluminum alloy cable products produced by Chinese local wire and cable manufacturers through independent research and development. A blank in the industry, so it is of great significance to China's wire and cable industry. In the use process of aluminum alloy cable products, it does show extraordinary process performance. In fact, many conclusions have been drawn on this point thirty years ago. For example, the American GC company concluded that the reliability of the connection part of the copper-clad aluminum wire is that it can be connected in the same way as the copper wire. UL has also conducted research on accidents caused by poor connection of 10AWG and 12AWG aluminum wires, but copper-clad aluminum does not have this problem. The American UL has also developed a copper-clad aluminum conductor standard (UL1561-2001). In addition, the British BICC company has studied the power load of cables and connections for seven years. After 10 million hours of repeated tests, the results show that copper-clad aluminum can economically and technically compete with copper wires, and the price is stable.
And neighboring Japan, as a developed country of wire and cable, also attaches great importance to the development and production of aluminum alloy cables. Among them, the Japanese Wire Co., Ltd. has conducted a lot of investigations and studies on whether copper clad aluminum is used as a conductive material for wires and cables. The contents of the research and experiment include: (1) Conductor structure of copper clad aluminum (the relationship between the wire diameter and thickness of the copper ratio of 10-15%); (2) physical and mechanical properties; (3) surface characteristics, especially contact with aluminum The resistance is particularly large, and copper clad aluminum is as good as copper. At the same time, it has also tested its bending rigidity, repeated bending, and repeated winding.
In addition, the Wire Co., Ltd. has also conducted a lot of research on the connection of connectors and wiring appliances: (1) the test of contact resistance; (2) the electric thermal cycle test. Research on connection with copper joints: (1) the use of the selected size range; (2) the effect of the secondary crimping; (3) the suitability of various joints and connectors. After several years of practical research, it has been proved that copper-clad aluminum has: (1) easy connection; (2) reliable connection; (3) light weight; (4) good winding performance; (5) economical and compatible with copper wire It is also safe and reliable.
However, although developed overseas cable countries have confirmed that aluminum alloy cable products have many superior properties, and domestic aluminum alloy cable product research and development and production have also made initial trials and achieved certain results, they want to "substitute aluminum for copper in a short period of time." "But it's not easy. There is a process for people to accept new things, and the same is true for aluminum alloy cables. This is awaiting companies to continue to create successful cases so that more people can experience the changes brought about by new cables. As the saying goes, there is no rule and no circle. Due to the lack of relevant industry standards for domestic aluminum conductor cables, the market is not standardized. my country's cable industry standards are lagging behind, and there is still a gap with the standard systems of European countries.
The lack of a unified national standard has become the biggest obstacle restricting the promotion of aluminum alloy cables. If this problem can be solved, aluminum alloy cables will get greater development in China. There is no corresponding industry standard or national standard for aluminum alloy cables in my country, and there is no standard to follow for design, purchase, use, and acceptance. Aluminum alloy cables have been popularized and applied in China for several years, and their market share and application fields have been increasing year by year. The user's attitude towards aluminum alloy cables has gone through several stages of resistance, questioning, understanding and acceptance.
However, 2014 is undoubtedly a bumper year for aluminum alloy cable R&D and production enterprises. The main reason is that the State Grid Materials (2014) No. 880 company document (external document) has been issued a few days ago. This document is titled "State Grid Corporation Document: Reply to Recommendation No. 9287 of the Second Session of the Twelfth National People’s Congress. The document affirmed the importance of “substituting aluminum for copper” in the wire and cable industry, and pointed out that aluminum alloy cables with voltage levels of 10kV, 1kV, etc. National Cable Corporation's subordinate unit application, there are corresponding material numbers available for filing, and aluminum alloy cables have been included in the State Grid Corporation's 2014 new technology catalog.
At the end of the document, “the aluminum alloy cable products still have the following problems that need to be improved or resolved: one is to further improve the product standards and testing standards of aluminum alloy cables and accessories; the other is the core technology of the aluminum alloy cable conductor material formula and manufacturing process At present, there are only a few companies; the third is the need to continue to accumulate experience in the application of products of 10kV and above." That is to remind customers who have aluminum alloy cable conductors and aluminum alloy cable needs, look for advanced formula and first-class production technology and other core technologies The enterprise acts as a supplier.
The issuance of this document with milestone significance is undoubtedly the most exciting news for the professional manufacturer of aluminum alloy conductors. Some experts believe that the formulation of the industry standard for aluminum alloy conductor low-voltage cables has laid the foundation for product evaluation and quality supervision, and is an important means and measure to regulate the product market.
Therefore, 2014 is a bumper year for aluminum alloy cable R&D and production enterprises. With the inclusion of aluminum alloy cables in the State Grid Corporation of China's 2014 New Technology Catalog, it means that aluminum alloy cable products are used in the Chinese market. It will open up a whole new situation, and it also means that China's wire and cable industry has taken a step towards the goal of "becoming bigger and stronger".