ã€China Aluminum Industry Network】A wide range of reports in the cable market, some manufacturers even organize the thickness of a book, then, as an important tool to determine the performance of aluminum alloy cables, how do we interpret these test reports? How to open the phenomenon The essence is to grasp the key, to see the key? Which is more important? This article will be one for you to interpret.
In 2006 and 2007, two U.S. companies introduced aluminum alloy cable technologies and products that have been safely used for decades in North America and other countries, creating a Chinese aluminum alloy cable industry, and guiding and nurturing the domestic aluminum alloy cable market. In recent years, the voice and enthusiasm of "aluminum substitute for copper" has increased with the clear support of the national level. Aluminum alloy cable, this new technology product, has been recognized by more and more users, and the development trend is gratifying. However, the emergence and development of new things will inevitably have a chaotic phase. The chaos of the aluminum alloy cable industry has been accompanied by the opening of the industry. Recently, the article "13 misunderstood analysis of aluminum alloy cables" issued by China Cable Online disclosed the major chaos in the industry. However, there are many chaos not mentioned in the above article. Such as: some non-professional manufacturers, network companies, counterfeit companies in the so-called aluminum alloy cable test report there are many tricky.
Our country's current testing method is commissioned and tested. The test results are only for the sample. That means that the sample is sent by yourself. Your sample comes from your own responsibility. My test result is only responsible for the sample you sent. . There is no problem with the samples of regular professional manufacturers, that is, the products they produce. Because non-professional manufacturers, network companies, and counterfeit companies have failed to produce products or produce qualified products, samples submitted for inspection are likely to come only from the formal manufacturers that they themselves say clearly. Therefore, we cannot believe only the test reports provided by a company without actually investigating whether a company has the ability to produce aluminum alloy cables. In addition, the so-called test reports of these companies are even counterfeit reports of others. In general, the authenticity of the report can be found on the website of the testing agency indicated on the report.
The authenticity of the test report is a problem. The judgment of how much gold is contained in various test reports is also a problem that many users have been puzzled by. Nowadays, with regard to testing reports on aluminum alloy cables, there are many types of testing organizations and there are many types of reports. Many people in the industry are not clear about it, not to mention the professional users. So this article is necessary to be a simple card reader to readers.
In fact, the aluminum alloy cable industry contacts more authoritative testing agencies, mainly: Shanghai Cable Institute, National Wire and Cable Quality Inspection Center, Mechanical Industry Electrical Material and Special Cable Product Quality Supervision and Inspection Center, National Fireproof Building Material Quality Supervision and Inspection Centers, electrical industry quality inspection and testing center for electrical equipment (Wu Gao Institute), etc. These authoritative testing organizations have their own professional direction and expertise in their respective fields. Types of inspection reports include type tests, commission inspections, test reports, inspection reports, etc. Usually, inspection types are selected based on the inspection items and the number of inspection items involved. There are also inspection standards and inspection agencies that are based on the inspection content.
Usually the type test requires more items to be tested, which involves basic performance requirements such as electrical, mechanical, insulation, and sheathing of the cable. The entrusted inspections, test reports, inspection reports, etc. are basically tests that are conducted on the performance requirements of cable materials or products, and the inspection forms are selected according to different assessment requirements. These different tests, in combination, can basically reflect the quality of cable products.
For aluminum alloy cable, because it is a new type of material product, in addition to the basic performance test of cable products, special attention should be paid to assess whether the manufacturer has:
(1) "Test report on conductor aluminum alloy rod material": This report deals with material chemical composition, tensile strength, elongation after breaking, electrical conductivity, material density, etc. It should meet all requirements of national standards in order to prove the aluminum alloy cable. The conductor material is qualified. This is a report that examines whether the aluminum alloy cable conductor material is qualified or not.
(2) "100-hour compressive creep test report for conductor aluminum alloy materials": This report can examine the creep resistance of conductor materials used in aluminum alloy cables and can understand whether the rate of change of creep curves is related to copper materials. The change rate of the creep curve is similar to explain the compressive creep characteristics of the conductor aluminum alloy. The reason why the national standard stipulates the test time is 100 hours because it is necessary to have such test time guarantee in order to truly reflect the compressive creep characteristics of aluminum conductors.
(3) "Conformity inspection report of aluminum alloy materials for aluminum alloy cable conductors and aluminum alloy copper connection terminals": The industry has disclosed the problem of deliberately concealing eight years of mistakes using copper-aluminum transition terminals for aluminum alloy cable connections. In the future, the correct connection scheme is to use aluminum alloy copper connection terminals with the same performance as the connected aluminum alloy cables. In this way, the supplier shall be particularly required to provide aluminum alloy cable conductor and aluminum alloy copper connecting terminal issued by authoritative inspection agencies aluminum alloy material consistency inspection report, to prove that the aluminum alloy terminal aluminum alloy material and aluminum alloy cable used The consistency of all properties of the material ensures that the aluminum alloy and aluminum alloy cable of the aluminum alloy copper connecting terminal have the same electrical, mechanical and compressive creep properties, and ensures the safety of the use of the aluminum alloy cable. The report is self-evident to determine the importance of authentic aluminum alloy connection terminals.
(4) “1000 Thermal Cycle Reports for Cables and Terminalsâ€: ​​However, this test cannot reflect the compressive creep properties of the material, which is a significant drawback of the inspection. Because of the aluminum alloy cable compression creep performance is more prominent advantages and more basic assessment items. Of course, this report is even more perfect.
(5) As for other so-called authoritative assessment reports, industry certifications, etc., in fact, some companies are playing tricks. As we all know, these things are all consulting and intermediary agencies run by some industry departments. They are not issued by any authoritative organization at all. It is not difficult to get them as long as the fees are paid. These reports, certifications, etc., which cannot explain or prove anything about product quality, are not sufficient references. There are also reports of product qualifications and other reports, which prove that the technology of these companies is not yet mature and they also use aluminum alloy cables as new products because aluminum alloy cables are mature technologies and products that have been safely applied by the United States for decades.
Prior to the introduction of special standards for aluminum alloy cables, the inspection of aluminum cables of professional manufacturers is usually performed with reference to the current national standards, industry standards, or partial projects of copper cables with reference to the relevant national standards for aluminum cables. Some manufacturers who have not yet grasped their own products through national standards are providing their own set of corporate standards as the basis for testing. This can be seen from the description of the test standard of the inspection report.
Aluminum alloy cable industry special standards mainly include the more important national energy industry standard "rated voltage 0.61 kV aluminum alloy conductor XLPE insulated cable" and "aluminum conductor for cable conductor". There is also a national recommended standard for the production and sale of aluminum alloy cable conductor rods, "Rare Earth Ferro Alloy Rods for Electrical Use", and a new version of "Electric Round Aluminium Rods", which was issued after revision. Aluminum alloy cables are more important and authoritative national energy industry standard "rated voltage 0.61 kV aluminum alloy conductor XLPE insulated cables" is the main basis for the future detection of various properties of aluminum alloy cables, the formulation of the standard cited copper Cable production, testing of major national standards and aluminum alloy cable American standards ASTM B 800 05 (2011), 80107 (R2012) and so on.
Because the aluminum alloy cable is a conductor of the new material aluminum alloy conductor, so the authoritative national energy industry standard "rated voltage 0.61 kV aluminum alloy conductor XLPE insulated cable" specifically developed in the qualified conductor aluminum alloy and aluminum alloy cable The standard clauses indicate the basic characteristics of this conductor. Specific examples are as follows:
(1) ASTM B 800 05 (2011) and national standard AA-8000 conductor aluminum alloy chemical composition.
(2) Tensile strength: 98Mpa-159Mpa.
(3) Elongation: 10% or more.
(4) Conductivity: 61% IACS and above (20 degree DC resistance 0.028264 and below).
(5) Material Density: AA8000 aluminum alloy density 2.71g/cm3 and above.
(5) 100-hour compressive creep test: Test conditions: test temperature 90 degrees, test compressive stress 76 Mpa, examination time 100 hours, and then see the conductor aluminum alloy creep curve and copper conductor creep curve comparison.
Only these standard assessment clauses are satisfied at the same time (note: it is at the same time satisfied) that they are qualified conductor aluminum alloy materials.
According to an authoritative testing agency, among the many aluminum alloy cable manufacturers currently inspected, aluminum alloy cable conductor aluminum alloy rods with superior overall performance have Asian advanced, can cast 3807 mm2 aluminum alloy casting blank continuous casting and rolling The UMI Electric Company of the U.S. production line. This American company's conductor aluminum alloy rod material not only exceeds the standard requirements of all performance, electrical conductivity, material density and other excellent test results, fully reflects the 3807 mm2 large-section billet casting rolled out of the rod material performance is not average. This is something that other manufacturers in the industry who can only cast 2400 mm2 cast strand continuous casting and rolling production lines can't hold back.
When the user selects aluminum alloy cable manufacturers, it is better to firstly select the supplier who can provide aluminum alloy cable full set of technical product solutions. Because of the strength of such manufacturers, strong technical innovation capability, can provide a full set of technical support and a full set of cables and dedicated connection terminals. Accessories and other products can ensure that the cable connection scheme is perfect, so as to ensure that the aluminum alloy cable is safe and free of hidden dangers. Secondly, U.S.-funded enterprises are selected because aluminum alloy cable technology comes from the United States that has been safely used for decades. These U.S.-funded enterprises have mature production technology and production experience in the United States and can produce high-quality aluminum alloy cable products.
In addition, when inspecting various test reports of aluminum alloy cable manufacturers, it is first necessary to check these manufacturers first:
(1) "Test report on conductor aluminum alloy rods".
(2) "100-hour compressive creep test report of conductor aluminum alloy material".
(3) "Conformity inspection report of aluminium alloy cable conductor and aluminum alloy copper terminal aluminum alloy material".
To ensure the safe use of aluminum alloy cable. If these three reports are complete, it proves that the company has the basic conditions for producing aluminum alloy cables and providing qualified products. If none of the basic conditions are met, and even if the conductor material is not qualified, it cannot be proved. Therefore, other so-called test reports are practically meaningless. Under the premise that all the above three reports are available, inspection reports such as type tests and commissioned inspections shall be examined again. A complete test report can prove that such a company has the ability to produce qualified aluminum alloy cable products.
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