Inspection criterion 1: product quality
Aluminum alloy cable is mainly composed of conductor, insulation and armor (sheath), from the analysis of the basic three elements of aluminum alloy cable, the quality of aluminum alloy cable can be seen a rough.
(1) Aluminum alloy conductor rod: see whether it can independently produce high-quality aluminum alloy conductor rod
At present, there are not many domestic manufacturers with independent aluminum alloy conductor production technology, and there are only a handful of aluminum alloy conductor rod production lines that can be continuously smelted, continuously casting, and continuously cast and rolled The production capacity of body rods relies on commissioned processing, so-called secret smelting, or other aluminum alloy conductor rods purchased from no regular way, which not only cannot guarantee the basic quality of aluminum alloy cables, but also cannot guarantee the quality of cables from the source quality control. In addition to the aluminum alloy conductor rod production line with smelting, continuous casting, continuous casting and rolling, it also depends on the size of the cross-section of the casting billet continuously cast in the production line, the larger the cross-section, the better the quality of the rolled aluminum alloy rod Different, "Thousands of tempers make good steel". Excellent aluminum alloy conductor rod is the decisive factor of the electrical properties and mechanical properties of aluminum alloy cable. Cables, armor, etc., cannot change the basic quality of their conductors.
(2) Insulation: There are three things to look at about insulation; Cross-linking, stranded conductors, conductors annealed into cables
(1) degree of cross-linking; One of the points that aluminum alloy cables are superior to copper cables is that all aluminum alloy cables are insulated with cross-linked polyethylene, and the cable working temperature is 90 degrees. It is precisely because of the use of cross-linked polyethylene insulation that there is a problem of cross-linking, and regular professional aluminum alloy cable manufacturers should have a special cross-linking room.
(2) stranded conductor; Looking at the stranding technology of the conductor and the conductor stranding production line, the current domestic cable industry stranding conductor equipment is basically similar, and the stranded conductor produced usually produces aluminum chips and burrs, damaging the insulation and impacting Insulation effect, causing safety hazards and shortening insulation life. The most advanced stranding conductor equipment is a split-motor, PLC program-controlled nano-technology conductor stranding equipment, which adopts this advanced process equipment and microcomputer control production The production of programming, innovative top nanotechnology, the production of aluminum alloy conductor surface without aluminum chips, no burrs, no oil stains, no bumps, no scratches, no scratches, can most effectively ensure that the cable insulation without any damage and damage, to ensure the product The service life is much higher than that of similar products.
(3) Conductor annealing: Usually the internal stress of the stranded conductor after the conductor is stranded will be exerted on the insulation, so that the insulation will be stressed for a long time, accelerate the aging of the insulation, and affect the service life of the insulation, which will directly affect the use of the cable life, which is why copper cables do not last long. Aluminum alloy production plants in the United States use the conductor cable annealing process to solve the problem of internal stress. The annealing process technology can further improve the electrical and mechanical properties of the product At the same time, the internal stress generated by the conductor twisting process is eliminated, and the service life of the insulation is effectively guaranteed. Therefore, it is necessary to see whether there is cable annealing process technology and conductor cable annealing furnace equipment.
(3) Armor: see if there is advanced aluminum alloy interlocking armor equipment
Due to the poor level of equipment and the substandard process level of aluminum alloy armor of many domestic manufacturers, the alloy belt is wide and the crest spacing of the armor is large, resulting in stiff cables, inflexible bending, easy to take off armor, and compressive performance Poor, not good. At present, the most advanced aluminum alloy interlocking armor equipment is Canada's KALMARK aluminum alloy interlocking armor production line, which produces interlocking armor with good tightness and ring between armor Interlocking, not easy to get out of. Due to the small spacing between the crests of the armor, the armor at the same distance has more stress points than other armor products, and can withstand greater pressure without causing damage to the cable core. Due to the many crests, bending Smaller radius and better bending resistance. This kind of aluminum alloy armor can really meet the requirements of American standards for aluminum alloy armor.
Inspection standard 2: manufacturing equipment
It mainly examines whether the enterprise has advanced aluminum alloy cable production and manufacturing equipment and technical process equipment.
(1) Aluminum alloy conductor rod continuous casting and rolling production line
The key to aluminum alloy cable is the production of aluminum alloy conductors, so when choosing a manufacturer, we must first take a look at whether there is an advanced aluminum alloy conductor rod continuous casting and rolling production line, and the most advanced aluminum alloy conductor rod in China The timber production equipment is Italian technology, which can continuously cast large cross-section (3807mm2, the maximum casting cross-section of other production lines imported from Italy can only reach 2400mm2). line, 3807mm2 aluminum alloy billet after thousands of hammering, large compression ratio continuous rough rolling, multi-pass continuous fine rolling can obtain rod with moderate strength, large bulk density, the best conductivity, and the best technical indicators Different aluminum alloy rods, the alloy wire drawn from this aluminum alloy rod is used to the conductive core of the aluminum alloy cable conductor, which is the best product for cable superposition combination. If a factory does not have advanced aluminum alloy conductor rods for continuous casting and rolling The quality of aluminum alloy conductors cannot be controlled from the source of production, and the quality of aluminum alloy cables cannot be guaranteed!
(2) Conductor stranding production line
At present, the stranded conductors produced by the conductor stranding production line of general domestic manufacturers usually produce aluminum chips and burrs, damage the insulation, seriously affect the insulation effect, cause potential safety hazards and shorten the insulation life. At present, it is the most advanced in the country The conductor stranding production line is a nano-level stranding machine production line with motor type and PLC program control, and the surface of the aluminum alloy conductor produced by nanotechnology has no aluminum chips, no burrs, no oil stains, no bumps, no scratches, no scratches, It can most effectively ensure that the cable insulation is free of any damage and destruction, and ensure that the service life of the product is much higher than that of similar products.
(3) Aluminum alloy interlocking armor production line
At present, the world's most advanced aluminum alloy interlocking armor machine production line is Canada's KALMARK aluminum alloy interlocking armor machine production line, which is developed and developed according to American technical standards The interlocking armored cable, the special structure of interlocking between the layers can ensure that the cable is damaged by strong external forces, even if the cable is subjected to large external pressure and external impact force, the armored layer can also protect the electrical properties of the insulation layer Yes. The structure of the aluminum alloy non-magnetic armor layer also effectively improves the flame retardant level of the cable, greatly reducing the fire or fire hazard to the cable, and the non-magnetic aluminum alloy armor also greatly reduces the eddy current loss of the cable. Aluminum alloy Compared with steel belt armor, the armored structure is light in weight, no eddy current loss, easy to lay, easy to bend, and does not need to be installed in a bridge, which can reduce the installation and laying cost by 20%-30% and improve the installation efficiency.
Inspection criterion 3: test report
It mainly inspects whether the company's products have passed various tests and certifications such as product characteristics, fire resistance, flame retardant, flue gas toxicity, light transmittance, etc.
(1) Three necessary technical reports: "Aluminum Alloy Conductor Material Inspection Report", "Aluminum Alloy Conductor Compressive Creep Performance Test Report" and "Transition Terminal 1000 Thermal Cycle Test Report". The first one is aluminum The report on whether the alloy conductor material meets the chemical composition requirements of AA8000 grade requirements, the second is the report on the direct difference between aluminum alloy and pure aluminum, and the third is the reliability report of the connecting terminal Grid aluminum alloy cable must have.
(2) Inspection reports of aluminum alloy cable products issued by China National Wire and Cable Testing Center, State Grid Wuhan High Voltage Research Institute and other national testing institutions.
(3) The test report of fire resistance, flame retardant, flue gas toxicity and light transmittance issued by the National Fireproof Building Materials Quality Supervision and Inspection Center.
(4) When choosing halogen-free and low-smoke products, special attention should be paid to the test report of smoke toxicity and light transmittance issued by the National Fireproof Building Materials Quality Supervision and Inspection Center; At present, many domestic manufacturers claim to produce halogen-free aluminum alloy cables Low smoke, and the materials used in the actual product do not meet the requirements of halogen-free and low smoke, which can be seen from the test report. The national standard (GB/T20285-2006 material tobacco toxicity risk classification) is related to tobacco toxicity testing test the safety level; Tobacco safety: AQ1>AQ2> ZA1>ZA2>ZA3>WX; The light transmittance should be greater than 60%, where (AQ: is the safety level, ZA is the quasi-safety level, and WX is the dangerous level level). According to the test results of aluminum alloy products, only those with smoke toxicity indicators reaching AQ level and light transmittance greater than 60% are truly halogen-free and low-smoke products, which are truly safe and reliable, and will not release toxic gases even if the cable is burned body, laying, installation, use of high safety.
(5) As for other so-called appraisal reports, industry certificates, etc., they are actually played by some enterprises. As we all know, these things are issued by consulting and intermediary agencies run by some industry departments, and it is not difficult to get them as long as you pay a fee. These reports, certificates, etc., do not explain or prove anything to the quality of the product, and are not enough as a reference.
考察标准四：自主知识产权、技术专利
铝合金电缆在国内属新型导体材料产品，现时使用的标准没有对铝合金导体材料专门的规定条款，为避免材料技术来源不明，导致铝合金电缆产品性能、质量不 能保证，选择的制造厂家必须拥有该导体材料及制造技术的自主知识产权专利证书。是否拥有核心的铝合金导体熔炼配方及制备的专利技术和自主知识产权，这是体 现一家企业拥有雄厚技术实力的基础条件。众所周知，若不具备铝合金导体的核心技术，再响亮的广告宣传也很难保证是正宗的铝合金电缆。拥有发明专利的核心技 术铝合金配方是铝合金导体生产第一道工序中熔炼、铸坯、轧制杆材的首要前提，没有真正的铝合金发明专利配方，再先进的连铸连轧工艺装备也无济于事。铝合金 材料专利配方是实施高水平铝合金电缆加工制造、工艺技术的前提条件，是铝合金电缆品质优异的保证，是一家企业真正的技术优势。
考察标准五：质量控制
Cable is the artery of energy transmission, which is related to the safe and stable operation of power transmission in an enterprise and even a region. Production of aluminum alloy cable products and production Copper cables are very different in the production process, and the production of aluminum alloy cables requires a lot of professional testing equipment and a perfect quality management system. Each batch of aluminum alloy cables needs to be strictly carried out through all aspects of production Testing, inspection, before it can leave the factory. Examining a manufacturer's attitude towards quality control, it can be seen from the invested personnel, funds, and institutions that a professional aluminum alloy cable manufacturer should have a special quality management office Laboratory, chemical analysis laboratory, mechanical performance laboratory, physical performance laboratory, spectral analysis laboratory, electrical performance laboratory, etc., excellent enterprise quality control is from smelting alloy aluminum liquid to continuous casting and rolling; Pull from the aluminum rod Wire, pressing and twisting to conductor heat treatment; From conductor insulation extrusion, cross-linking to insulated core cabling; Finally, every process from armor, sheath, routine test, and packaging to the factory has a perfect and strict tracking inspection, that is, from the source Start controlling and ensuring that the finished cables are produced of the highest quality. The whole process of quality control is carried out on the products produced, and the time nodes are accurate to every minute and second, and the corresponding labels are marked in the aluminum alloy cable structure to ensure that every inch of aluminum is ensured Traceability of quality control of alloy cables. One of the important testing equipment in the many testing equipment is the aluminum alloy conductor material testing equipment, and the most advanced aluminum alloy conductor material testing equipment in the world is the full spectrum of Germany Direct-reading plasma emission spectrometer, its detection speed is the fastest, the highest accuracy. The spectrometer is mainly used to detect the chemical composition of aluminum alloy materials and the crystalline state of the alloy. Without advanced testing equipment, it is impossible to guarantee aluminum alloy conductors Quality!
Inspection standard 6: technical standards
The national industry standard for aluminum alloy cable has been submitted to the national competent authority for approval, if it is involved in the formulation of national standards, and at the same time is a company specializing in the production of aluminum alloy cables, it must be strong and influential in the industry The United States is the place where aluminum alloy cable was invented, and the manufacturing technology and installation experience of aluminum alloy cable in the United States are more than 40 years ahead of China, so objectively speaking, American companies, especially the earliest to bring aluminum from the United States Alloy cable technology and aluminum alloy cable manufacturers manufactured according to American standards, safety and reliability are more guaranteed.
Criterion 7: Customer cases
The application scope of aluminum alloy cable covers residential, commercial, industrial buildings and other fields, and the feedback of customers is very valuable for reference. If the customer's cable has problems at both ends in three days, the manufacturer needs to carry out after-sales maintenance, indicating that the quality of the cable needs to be studied. A quick way to judge aluminum alloy cable manufacturers is to investigate the power design unit, if a power engineering consultant The power transmission of the building project of the consulting and design unit itself is made of aluminum alloy cable, so the supplier and the product must have been fully and rigorously scientifically demonstrated, and you can choose with confidence.
Criterion 8: value-added services
The general domestic enterprises are used to make aluminum alloy cables with the thinking of copper cables, aluminum alloy cables are only a variety of their product series, and the idea of operating aluminum alloy cables is also the idea of continuing to use copper cables, simply selling cables. as Today, with the simple sale of cable thinking to sell aluminum alloy cable has not met the requirements of the times and social development, the production of aluminum alloy cable is a high technical threshold, a powerful aluminum alloy cable manufacturer, not only to be able to To provide the best quality aluminum alloy cable products, we should also be able to provide a complete set of cable transmission solutions, cable connection terminal solutions, and help customers to do "project technical solutions", "product life cycle cost". Analysis report" and other technical and business solutions to help customers provide additional value-added services such as cable selection, installation guidance, personnel training, operation monitoring, etc., without professional strength, no attention and accuracy to the aluminum alloy cable industry It is difficult for enterprises to prepare long-term service for aluminum alloy cable users.
Inspection criterion 9: on-site inspection
Since domestic cable products are subject to the inspection system, the samples commonly shown to customers in the industry are all entrusted to gift companies, and the reports issued by the testing agency are only responsible for the samples sent for inspection. If practical There is a problem with the supplied product, which harms the interests of users. Some unscrupulous manufacturers take advantage of the loopholes in the policy, and take the samples of other manufacturers to the relevant testing institutions for testing after changing the labels, and use the products of regular factories as products Their own products are made to show samples to customers, deceiving testing institutions and users, and also saying that they have inspection reports, and the samples are also very beautiful, and the actual products supplied are far from the samples, and the quality of the products cannot even be guaranteed. cause Therefore, it is best to conduct on-site inspections of manufacturers to inspect the real strength and product quality of manufacturers to ensure that the products purchased are consistent with the samples. If a manufacturer's aluminum alloy cable products can ensure the production of random inspection at any time The quality of the product has the same quality and quality as the samples sent for inspection, which is guaranteed.
Inspection criterion 10: brand culture
From the culture, business philosophy, and brand accumulation of an enterprise, we can also feel the attitude of an enterprise towards the aluminum alloy cable industry, whether it is shouting some "green environmental protection" public relations slogans, or doing it solidly products, to provide customers with high-quality products and services, representing the different business styles of different enterprises and the attitude towards the aluminum alloy cable business and users. The former is a false empty, and the latter is low-key, pragmatic, and truly stands on the customer's side Considering the customer's perspective, putting the customer's interests first, is to treat the customer as if it were himself. Some unscrupulous manufacturers deceive customers for commercial interests and harm customer interests by stealing dragons and phoenixes For example, using aluminum cables to impersonate aluminum alloy cables, using counterfeit and shoddy aluminum alloy cables to hit the market at low prices, and pretending to be industry authorities and making unscientific statements and practices when replacing aluminum alloy cables with copper cables, these behaviors are not only harmful It harms the interests of customers, and what is even more fatal is to leave safety hazards for users and have a negative impact on the healthy development of the aluminum alloy cable industry. These bad behaviors are what we need to deeply expose and criticize.
The above 10 standards, with the first 5, can be judged to be a qualified aluminum alloy cable manufacturer, if all 10 standards are met, it is an excellent aluminum alloy cable manufacturer. Pass the above 10 criteria, how to choose an excellent aluminum alloy cable manufacturer, can make an accurate judgment. Most of the manufacturers who do not have aluminum alloy cable production technology and equipment, have poor ability and are not professional It can be ruled out. The quality of the enterprise and product selected in this way should be relatively safe and reliable!