[China Aluminum Industry Network] A train with a speed of 300km/h is galloping on the track of a modern high-speed railway. Suddenly there is a railroad track in the 90s of the last century. What will happen to this train? The answer is obvious. The more advanced traffic is. If the means of transport does not tie in with more advanced rail equipment, it will not only exert its original advantages and value, but will also cause major safety problems.
The same applies to the application of aluminum alloy cables. Aluminum alloy cables originated in North America are widely used in various fields of the national economy for their outstanding electrical performance, mechanical properties, and economy. The successful application of aluminum alloy cables in North America is The supporting connector is inseparable.
In 1970, related wire and cable companies in the United States, as well as companies in other industries such as electrical product laboratories and connector companies, formulated plans to re-evaluate aluminum and aluminum alloy conductors. The electrical laboratory re-evaluated the aluminum alloy core cable, and the connector company re-created a new type of aluminum alloy connector whose aluminum alloy core cable has the same performance as the aluminum alloy core cable. After stringent screening of aluminum alloy core cables, the United States wire and cable companies chose 8000 series aluminum alloys and began to use in the manufacture of power cables for construction and other fields. Among them, AA-8176 and 8030 aluminum alloys are more widely used. In the U.S. national regulations, it is also stipulated that the relevant cable manufacturing must adopt the new alloy AA-8000 series electrical grade aluminum alloy material. In order to cooperate with and support wire and cable manufacturers, connector companies and electrical laboratories have actively developed connector technology for AA-8000 series aluminum alloy conductors. Breakthroughs in connector technology have been achieved, and aluminum alloy core cable performance is consistent with aluminum. Alloy connector products are widely used with aluminum alloy cables. The application of American alloy cable, from the product technology invention to the related accessory connector technology and product improvement, took only two years.
The progress in the application of aluminum core and aluminum alloy core cables in China is quite different from that in the United States. In the research and development of China's wire and cable products, the development of wire and cable installation and installation hardware always lags behind the progress of wire and cable itself. For example, due to the backwardness of erection hardware for overhead insulated cables, it has seriously hampered the promotion and export of aerial insulation. The countries that export more overhead insulated cables in the world are Finland. They are all exported together with erection hardware. This phenomenon still exists to varying degrees. Nowadays, with the development of aluminum alloy cables, there are also major problems with the lag in the technology of supporting hardware (connecting accessory products). This severely restricts the popularization and application of aluminum alloy cables. It is understood that currently in the domestic aluminum alloy cable companies, in addition to the industry leader in the brand of Star Star alloy cable and other very few brands have a cable production, aluminum alloy connection terminal accessories production and other comprehensive capabilities, can be described as a real aluminum alloy cable Outside the full set of technology product providers, most companies in the industry currently do not have the ability to provide a full range of products.
Aluminum alloy cable misconnection scheme is currently used in domestic aluminum alloy cable connection using aluminum connectors such as copper and aluminum transition terminals used in aluminum cables and aluminum alloy connectors with inconsistent cable performance as the connection scheme. This connection scheme will leave hidden safety hazards, leaving the advantages and value of aluminum alloy cables out of use, and the use of aluminum alloy cables will become unadvantaged and valuable.
There are five reasons why aluminum alloy cables must use aluminum alloy special terminals:
For the first reason: copper-aluminum transition terminal due to the presence of aluminum in the terminal, all aluminum defects and deficiencies still exist, this terminal is used to connect aluminum alloy cable, the advantages and the value of the aluminum alloy cable is gone, but also It is better to use aluminum cables directly because aluminum cables are more economical. The use of aluminum alloy special terminals will give full play to the advantages and value of aluminum alloy cables.
The second reason: Copper-aluminum transition terminals were originally used to connect aluminum cables. The terminal installation size does not match the size of the terminal equipment. It not only increases the cost of transferring bronze medals, but also transfers the copper cards in multiple passes and will also leave connection security risks. . Using aluminum alloy dedicated terminals can avoid similar problems.
The third reason: Because the copper-aluminum transitional connection terminals do not match with the electrical terminals, the contradiction of transferring copper bills often arises, and it is difficult to avoid connection security risks caused by brutal construction due to unsolvable problems of this type. Using aluminum alloy dedicated terminals can avoid similar problems.
The fourth reason: Copper-aluminum transition terminals were originally used to connect aluminum cables. The inner diameter of these terminals does not match the outer diameter of the cable conductors. Special crimping tools must be used, making it difficult to standardize the construction and leaving hidden safety hazards. Using aluminum alloy dedicated terminals can avoid similar problems.
The fifth largest reason: At present, the purity of aluminum in the various brands of copper-aluminum transition terminals used in the market can only reach 99.5% (Note: The purity of general electrical aluminum is above 99.7%). Moreover, the aluminum in the copper-aluminum transition terminal is also manufactured and solidified and quenched with relatively poor conductivity. Therefore, the integrated conductivity of these copper-aluminum transition terminals can only be less than 54% IACS. The rate requirement is above 61% IACS), which causes the electrical performance of the terminal and aluminum alloy cable to be mismatched. As a result, the transmission line resistivity increases by 21% or more, the line transmission capability decreases by 21% or the line loss increases by more than 21%. The ability to use aluminum alloy cables for power transmission can be fully realized using aluminum alloy dedicated terminals.
As for the other aluminum alloy terminals with inconsistent performance of AA-8000 conductor aluminum alloy, due to differences in the physical, mechanical, electrical, compressive creep properties of the material and AA-8000 conductor aluminum alloy performance, if such terminals for aluminum It is self-evident that problems such as hidden safety problems will be caused by the connection of alloy cables.
Therefore, the fact that users and related industry personnel must clearly understand is:
To ensure that the advantages and value of aluminum alloy cables can be brought into play and embodied, the preconditions for the safe and non-hidden application of aluminum alloy cables are: the aluminum alloy cables complying with the standards and the supporting aluminum alloy connectors that are consistent with the cable performance are used together.
At present, only the aluminum alloy cable industry in the industry has a North American background, has brought mature aluminum alloy cable technology and advanced production technology from North America, and insists on only being a boutique company. It overcomes the difficulties of the domestic aluminum alloy cable-free connector supply chain, develops aluminum alloy connection terminals that are consistent with the cable performance, perfects the application conditions of aluminum alloy cables, and adhering to the normative practices of North American and other countries. In the current domestic situation in which it is impossible to form a professional aluminum alloy cable connection terminal and other accessories for the production and supply chain, the top priority for aluminum alloy cable companies is to take the road of self-reliance, and to solve the production and matching problems of aluminum alloy connection terminals first. , ranging from not facing, to the reality. For the sustainable and healthy development of industries and enterprises, companies in the industry must face the reality.
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