[China Aluminum] A train racing at a speed of 300km/h is galloping above the rails of modern high-speed railways. Suddenly there is a railroad track in the 90s of the last century. What will happen to this train? The answer is obvious. If the more advanced transportation tools do not cooperate with more advanced rail equipment, it will not only fail to exert its original advantages and values, but will also cause major safety problems. Potassium Chlorate,High Purity Potassium Chlorate,Bulk Potassium Chlorate,General Potassium Chlorate Rucheng Sanxing Electric Chemical Co.,Ltd , https://www.3xchemical.com
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 connector for 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, the most widely used is AA-8176 aluminum alloy. 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 to actively carry out connector technology research and development work for AA-8000 series aluminum alloy conductors, connector technology has achieved breakthroughs, and connector products with aluminum alloy cables are widely used. application. The application of American alloy cable, from product technology invention to 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 accessories products). This severely restricts the popularization and application of aluminum alloy cables.
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: Generally, the purity of 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 the 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.