ã€China Aluminum Industry Network】 Nowadays, aluminum alloy cable knowledge and products have been widely used and popularized in the past eight years and have been widely recognized and accepted by the market. In the cable industry, building a resource-saving society with "aluminum alloy instead of copper" has gradually formed a social consensus. It has received strong support from the State Grid of the State Ministry of Industry and Information Technology, the Ministry of Housing and Construction, and other major cable users. The Ministry of Industry and Information Technology of the People's Republic of China has clearly stated that “aluminium substitutes for copper†will be promoted as a national strategy, and it will be determined that the support for the aluminum alloy cable industry will be included in the “Guidance Catalogue for Industrial Adjustmentâ€, and that the Ministry of Housing and Urban-Rural Development will implement the national industry standard “Design Code for Electrical Design of Residential Buildings†in 2012. It is clear that aluminum alloy cables and copper cables have the same use status. The State Grid, one of the cable's main users, has recently listed aluminum alloy cables in the “2014 New Technology Catalog†of the State Grid. The popularization and application of aluminum alloy cables is just around the corner. Seductive.
Aluminum alloy cable origin:
Aluminum alloy cable technology originated in the United States, aluminum alloy cable under the joint function of its matching aluminum alloy connector with the performance of the cable, created the United States and North American countries in the safety, accident-free application of aluminum alloy cable in the past 50 years of success history . This mature technology and products were brought into the Chinese market by UMI Electric Corporation and Tianjin Alcan Corporation in 2006 and 2007, respectively, which initiated and promoted the development of domestic aluminum alloy cable business.
Currently related standards and specifications:
In North America and other countries, the production of aluminum alloy cables is mainly based on American Standard ASTM B8000 (2011) and 80107 (R2012) for production and inspection. In China, the current state-of-the-art manufacturing standard for aluminum alloy cables, rated voltage 0.6/1kV aluminum alloy conductor cross-linked polyethylene insulated power cable, and aluminum alloy wire for cable conductors, have been approved for publication. Prior to the introduction of the special standards for aluminum alloys, the manufacture and inspection of aluminum alloy cables in the country, in addition to the production of aluminum alloy conductor materials, are mainly performed with reference to the copper cable standards such as GB/T12706.1-2008. For the manufacture of aluminum alloy conductor materials, the manufacturing technology of most domestic manufacturers currently does not meet the requirements of American Standard ASTM B80005 (2011) and 80107 (R2012). Although domestic standards drafted by some manufacturers, “Rare Earth High-iron Rails for Electricians†and the new “Electric Round Aluminium Bars†standard have also been issued. However, because of the technical limitations of these standards, and the gap between the American Standard ASTM B80005 (2011) and the lack of universal guidance, many manufacturers find it difficult to implement, which objectively causes the domestic manufacturing and inspection standards that are not actually in place. The status of difficult quality assessment. This is one of the main reasons why aluminum alloy cables have a wide gap in quality of aluminum alloy cables due to the uneven quality of conductor materials on the market.
Domestic aluminum alloy cable application standards have been relatively complete, the Ministry of Housing and Urban Development promulgated the national industry standard "electrical design specifications for residential buildings", national architectural standard design Atlas "aluminum alloy cable laying and installation" 10CD106 and other important guiding standards, norms and provinces The local guidance standards and regulations similar to the “Regulations for the Design, Construction, and Acceptance of Aluminum Alloy Cables†promulgated and implemented by the provincial management departments such as the Housing and Construction Department have already provided substantive guidance values.
Aluminum alloy cable product quality basic judgment:
One of the key points is that the basic quality of the conductor aluminum alloy rod determines the quality of the aluminum alloy cable is the quality of the conductor material is qualified, if the conductor aluminum alloy rod material is not qualified, the quality of the aluminum alloy cable is not talked about. The advantages and disadvantages of the conductor aluminum alloy rod material basically determine the superiority and inferiority of the finished aluminum alloy cable from the objective conditions.
Therefore, the basic determination of the quality of aluminum alloy cable products is first to assess the quality of conductor aluminum alloy rods. The production of aluminum alloy cables differs from that of copper cables. Because of the different nature of the conductor materials, it is necessary that the manufacturer must possess the core alloy technology alloy formulations for conductors, alloy smelting, material continuous casting and rolling production equipment and mature production processes. The chemical composition of the produced aluminum alloy rod material shall first meet the requirements of the chemical composition of the AA-8000 series aluminum alloy specified in the ASTM B80005 (2011) standard. Secondly, the mechanical properties are in line with the tensile strength of 103-152 MPa, the post-break elongation rate is greater than or equal to 10%, and the electrical properties are in compliance with greater than or equal to 61% IACS. All conductor materials that meet the above requirements are qualified conductor materials for the manufacture of aluminum alloy cables.
At present, the domestic conductor aluminum alloy material is superior in performance is the first in 2006 to bring the United States mature, advanced aluminum alloy cable technology into China's professional aluminum alloy manufacturer UMI Electric Company China factory 3807mm2 casting aluminum alloy rod material . Its excellent material properties, is currently all aluminum alloy manufacturers in China's 2400mm2 cast aluminum rod material can not be expected to back. For example, it is evident from the comparison of the material properties of the same American brand manufacturers.
The second key point is the compressive creep performance of conductor aluminum alloy rod material. Aluminum alloy cable is a new type of conductor cable invented because of the frequent occurrence of safety accidents in cable applications caused by defects such as poor compressive creep resistance of aluminum cables. One of the major advantages and values ​​of aluminum alloy cables is that their compressive creep properties are much better than aluminum cables.
Conductor aluminum alloy material is excellent or not, compressive creep performance is an important assessment conditions, compressive creep properties directly reflect the value of aluminum alloy cable.
At present, most domestic aluminum alloy cable manufacturers simply cannot provide test reports issued by authoritative testing organizations that can truly reflect whether their conductor materials are qualified or excellent.
The proposed national aluminum alloy cable special standard "0.6/1kV rated aluminum alloy conductor XLPE insulated power cable" and "aluminum conductor for cable conductors" clearly specify that the conductor aluminum alloy compressive creep test must reach 100 Hours of request. According to the standard requirements, some manufacturers only passed the 20-hour compression creep test, and the gap between the 100-hour requirement and the new national standard was too large to reflect the true creep resistance of the conductor material.
To investigate whether the creep resistance of the conductor material is excellent, the change rate of the compressive creep curve can be directly observed. The larger the change rate, the worse the creep resistance. We can compare the creep curves of the conductor aluminum alloy rods of two companies that are also American brands, and can determine the strength and the compression creep performance of these two corporate conductor materials.
The curve shows that the above curve is the compression creep curve of the copper material at the lower end, the compression creep curve of the aluminum alloy material of the middle conductor, and the upper end is the compression creep curve of the aluminum material. From the change rate of compressive creep curves of the conductor aluminum alloy rod materials of the two companies, it can be seen that the change rate of the compressive creep curve and the compressive creep curve of the copper material in UMI alloy cable conductor aluminum alloy rods The rates are basically the same, reflecting the superior compressive creep performance of UMI alloy cable conductor aluminum alloy rods in the United States.
After ensuring the quality of the conductor aluminum alloy rod material, other aspects that guarantee the quality of the aluminum alloy cable have the conditions for entering the subsequent production process and producing a qualified aluminum alloy cable. If the conductor aluminum alloy rod material quality is unqualified, it is difficult to produce qualified products by subsequent production links, and it is even more impossible to produce high-quality products.
The follow-up production processes mainly depend on whether the equipment and technology are sophisticated and advanced, whether the production technology and technology are mature, whether the production management is standardized, and whether the selected insulation, sheathing, and other accessories are of high quality. Under the guarantee of excellent equipment, more solutions are needed. Production technology and management issues.
The manufacturing and inspection standards involved in this link mainly refer to the same implementation standards as copper cables, such as copper cable manufacturing and inspection standards such as GB/T12706.1-2008, as well as other special requirements of cables such as flame retardant, smoke poisoning, fire resistance, etc. The special performance of the product is also performed with reference to the relevant standards of copper cables during production and inspection. However, the production and inspection of aluminum alloy armored cable with aluminum armor are related to the provisions of the proposed national standards for aluminum alloy cables. Request execution.
The correct connection solution (A) The correct connection scheme for aluminum alloy cables (Achieves historical connection schemes for the safe and accident-free use of aluminum alloy cables in North America and other countries in the past 50 years) that aluminum alloy cables must be connected with aluminum with the same cable performance Alloy connector.
(B) Accidental connection scheme of aluminum alloy cable: When the aluminum alloy cable is connected, aluminum connectors such as copper-aluminum transition terminals used for aluminum cables and aluminum alloy connectors with inconsistent cable performance are used. This connection scheme will leave security risks. , so that the advantages and value of aluminum alloy cables disappeared.
Recently, for the sake of self-interest, some companies are still propagandizing the wrong connection scheme for aluminum alloy cables. They are also trying to explain that aluminum connectors such as copper-aluminum transition terminals can be used for the connection of aluminum alloy cables. As we all know, the application of cables, safety issues are basically in the connection, if the aluminum alloy cable connection, or the use of aluminum with potential safety problems, then the application of aluminum alloy cable has any advantages and values? This does not respect science, not For the sake of user safety, irresponsible behavior will definitely end up hurting others.
At the end of 2012, the product strategy of UMI Electric Co., Ltd. brought into the US mature aluminum alloy cable technology gradually shifted to the Chinese market. UMI brand aluminum alloy cable products in the United States were gradually recognized by domestic users for their unique advantages of superior quality and cost-effectiveness. , widely accepted. In particular, UMI recently announced that it has taken the lead in obtaining technical breakthroughs in aluminum alloy cable aluminum alloy copper connectors and other aluminum alloy cable connection accessories. It has solved the domestic aluminum alloy cable applications without the special aluminum alloy connector industry problems, and has protected aluminum. The application of the alloy cable is safe and free of hidden dangers, so that the advantages and values ​​of the aluminum alloy cable can be truly played and reflected. The comprehensive set-up capabilities for the production and supply of a full set of products have made UMI a provider of a full range of technical product solutions for the domestic aluminum alloy cable industry. UMI alloy cables in the United States have once again led the aluminum alloy cable industry in the direction of safe, non-hazardous application of aluminum alloy cables with its comprehensive experience in the correct application of aluminum alloy cables for decades.
At the same time, UMI alloy cable in the United States has a full set of solutions, high-quality products, comprehensive and cost-effective high three outstanding leading edge has become the U.S. UMI alloy cable development market, a unique weapon.
Domestic aluminum alloy cable industry is currently a full set of technical product solutions provider UMI alloy cable aluminum alloy cable dedicated aluminum alloy copper connection terminal and other aluminum alloy cable connection accessories products have successfully passed the national authority testing agency on aluminum alloy connectors and aluminum The performance of the alloy cable material was checked for consistency and a corresponding test report was obtained. This indicates that from now on domestically applied aluminum alloy cables have corresponding supporting products, which has opened the history of domestic safety and application of aluminum alloy cables. UMI's aluminum alloy connector-specific test report is shown below:
The most important issue for the application of aluminum alloy cables is to choose the right connection solution for connectors that are special for non-aluminum alloy cables and that have inconsistent performance with AA-8000 conductor cables (for example: copper-aluminum transition terminals and aluminum alloys with inconsistent performance with AA-8000 conductor cables Several fatal problems with connectors, etc.):
A. Copper-aluminum transition terminal Due to the presence of aluminum in the terminal, all aluminum problems still exist. If this terminal is connected to an aluminum alloy cable, the advantage and value of the aluminum alloy cable will disappear. It is better to use the aluminum cable directly because of the aluminum cable. more economics.
Second, the copper-aluminum transition terminal is originally used for aluminum cables, the terminal installation size does not match the size of the terminal equipment, not only increase the transfer bronze medal and other costs but also leave connection security risks.
Third, copper and aluminum transition terminal because it was originally used for aluminum cables, terminal diameter and cable conductor outer diameter do not match, must use special crimping tools, it is difficult to standardize the construction, leaving connection security risks.
4. The purity of aluminum in copper-aluminum transition terminals can only reach 99.5% (note: the purity of genuine electrical aluminum is above 99.7). This results in the comprehensive conductivity of copper-aluminum transition terminals only below 54% IACS (Note: conductors The electrical conductivity of the aluminum alloy is above 61% IACS). The electrical performance of the terminal and the aluminum alloy cable does not match. As a result, the transmission line resistivity increases by more than 21%, the line transmission capability decreases by more than 21%, or the line loss increases by more than 21%.
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.
The above problems in connection with various kinds of aluminum alloy cable connection make us clearly realize that the correct aluminum alloy cable connection solution with no safety hazard is a special aluminum alloy terminal and other connector with aluminum alloy cable and cable performance. Therefore, when using aluminum alloy cables, the first problem is to choose the right connection solution, followed by the brand, price and other issues.
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