铝合金电缆_稀土铝合金电缆_铝合金电缆厂家-东风线缆集团股份有限公司驰名商标

Popular search:Aluminum cable ZA-AC90 ZB-ACWU90 ZC-TC90
Product News
Media reports
 
Media reports 您的位置:首页 > Media reports

Five high performance aluminum cables
时间:2014-08-29   点击:(3434)

Safety performance aluminum cables 
 
A history proved 
Aluminum cable since 1968 the United States research and development, has been using for 43 years, the product has been quite common in North America market share of 80%. After 43 years of practice has proved that the use of aluminum cable has never been any failure, is safe. 
2, testing and certification 
Aluminum cable through the United States UL, authorities in Canada CUL, SAI GLOBAI international authoritative organization certification and China National Wire and Cable Testing Center of Australia, the National Network Wuhan High Voltage Research Institute, the National Fire Protection Building Materials Quality Supervision and Inspection Center, testing and certification, aluminum conductor comply with CSA standard C22.2 No. 38 articles on the ACM alloy wire requirements, and GB12706.1--2008 and IEC60502.1 latest version of performance requirements, and UL standards AA8000 series related. 
3, the role of aluminum components 
◆ aluminum conductor ingredients are added after the rare earth and iron and other elements, which greatly improves the performance of its electrical properties and connections, especially when conductor annealing add iron to produce a high-intensity creep resistance when current overload, iron play to continue connecting role of the aluminum conductor creep does not occur. 
◆ creep great harm to the cable, if the cable creep, the contact point of the original pressure tight enough, the pressure is reduced so that the contact resistance increases rapidly after the current flow caused by overheating of the joints, if unscheduled maintenance, there will be security risks. Very important to solve the problem of cable creep. 
◆ Creep: metal temperature, and the action of gravity forces, over time, permanent deformation will not be slow to recover, the phenomenon of creep. 
4, flame retardant 
Aluminum cable insulation material used flame retardant silane cross-linked polyethylene (XLPE), the use of self-locking armored structure, thermal performance is far superior to PVC jacket material can rapidly heat the process, after the flame disappears quickly extinguished the flames , does not extend to other natural materials, extremely excellent flame retardant properties. Aluminum cable using new materials and new technology, to ensure that their use safer. 
 
Electrical properties of aluminum cables 
 
1, cable ampacity 
◆ alloy conductor cross-sectional area is 1.5 times of copper, copper alloy conductor and conductor electrical properties as implement the same carrying capacity, resistance, and pressure loss. 
◆ resistance between the aluminum and the aluminum alloy of copper, aluminum slightly higher, but lower than the copper, under the premise of the same cross-sectional flow, the length of the equivalent weight of the aluminum alloy conductor is only half the copper. If the conductivity of copper by 100%, the conductivity of the alloy is about 61.2% of the conductor, the proportion of the alloy was 2.7, the proportion of copper is 8.9, then (8.9 / 2.7) × (0.612 / 1) = 2, i.e., 2 the unit weight of the same alloy and a resistor the resistance of copper per unit mass, so that when the cross-sectional area of ​​the alloy is 1.5 times that of copper conductors is the same as its electrical performance, that is to achieve the same cross-sectional flow, and copper, resistance, and voltage losses. 
◆ Factors power cable cut a lot of traffic, such as line characteristics (such as the working electrode, a current type, frequency, load factor); structure of wires and cables (such as the structure of the conductive core, the core number, the type of insulation materials, shielding layer and structures and materials, with a total outer diameter of the inner and outer sheath); laying conditions (such as air laying, pipe laying, laying directly buried underground channel in laying underwater laying); conductive core maximum allowable operating temperature and ambient conditions (such as air and soil temperature, soil thermal resistivity, surrounded by a heat source proximity effect) and so on. 
2, reducing the cable outer section of 
Aluminum cable production process, pressed Germany's most advanced technology, making it the conductor fill factor can reach 93%. And aluminum cable uses a silane crosslinked polyethylene, polyvinyl chloride thickness of the insulation just two-thirds will be able to far exceed conventional insulation. The fill factor of copper is generally only reach 80%, the commonly used insulation is used in polyvinyl chloride, aluminum cable diameter so on the basis of copper increased by only less than 11%, you can have the same electrical properties of copper. Be seen, the use of aluminum cable without changing the original piping design using copper cables. (General designer of laying pipe size for 150% copper, recently considered the problem of capacity increase, the size of the laying of the pipeline increased 200% copper, so wear a tube is not a problem.) 
3, to reduce cable damage 
Non-magnetic material, eddy current is not generated, can reduce the loss of the line. Aluminum armor lock fitted with even non-magnetic material, even if the three-phase current imbalance exists, it does not produce a vortex, can reduce the loss of the line. 
 
Mechanical properties of aluminum cables 
 
An extended performance aluminum cables 
Elongation is an important indicator of the mechanical properties of the conductor, is the product merits and can withstand external size of an important symbol. But also is an important indicator of the mechanical properties of the cable conductors. Aluminum cable elongation after annealing can reach 30%, while the elongation of 25% copper, the general elongation of 15% aluminum pole, is to replace aluminum cable and copper important indicator. 
2, flexible performance aluminum cables 
Torsion test: The main test of metal wire toughness, tenacity, the better able to withstand the more the number of reverse. An important disadvantage of ordinary aluminum wire is brittle high, as long as the number of times during the installation angle of torsion, the conductor will have cracks, splits will heat, corrosion, is an important reason for the fire. The use of aluminum cable, due to its good toughness, will not crack, appears to reduce security risks during installation. 
3, the bending properties of aluminum cable 
Bending test: The main test of metal bending performance. Material uneven or brittle materials, anti-bending performance is poor. 
According to GB / T12706 bending radius specified in the installation of copper, copper cable bend radius is 10-20 times the cable diameter, aluminum cable minimum bend radius is 7 times the cable diameter, can reduce the use of aluminum cable layout space , easier laying and reduce installation costs. 
4, rebound performance aluminum cables 
Practice has proved that: at room temperature copper and aluminum cable will be bent 90 degrees, after stress release, aluminum cable bounce angle is 60% copper. For aluminum cable has no memory, so the stability of the connection is better than the performance of the rebound copper cables, terminals connected to the connector during the installation easy pressing, increase the tightness improved. 
 
Aluminum cable service life 
 
1, there are two main conductor portion corrosion: chemical corrosion and electrochemical corrosion 
◆ chemical corrosion: refers to the metal with oxygen in the atmosphere, chlorine, sulfur dioxide, hydrogen sulfide and other gases made ​​by the following corrosion. 
After the metal surface with oxygen, generating different metal oxides. 
Aluminum oxide can form a dense surface hardness of the protective film. 
Loose iron oxide structure, easy to fall off, and continued penetration of the metal inside, diffusion, destroy material. 
Copper oxide, commonly known as Pseudomonas, between the above two, is a toxic substance. 
◆ electrochemical corrosion: means a metal and dielectric components of primary cells, the formation of corrosion of metals, and when the electrode potential of the metal in two different connected therebetween have water or other electrolyte, is generated between the two metals current forms a galvanic cell, the metal is one of a positive potential, and the other at a negative potential, a negative potential is constant on a metal ion through the electrolyte to the state at the positive potential of the metal buildup. So that in the negative potential of the metal gradual loss of damage, the formation of electrochemical corrosion. Difference between the electrode potential of the two metals bigger, the more intense the electrochemical corrosion. The higher the temperature, the metal corrosion is also more serious. 
Different metals have different electrode potential. Common electrode potential of the order of several metals; metallic Ag (silver) Cu (copper) Pb (lead) Sn (tin) Fe (iron) Zn (zinc) A1 (aluminum). Potential of + 0.8 + 0.334-0.122-0.16-0.44-0.76-1.33 larger the negative electrode potential of metal ions into the electrolyte become the stronger the tendency, i.e., the more susceptible to corrosion. More negative electrode potential of aluminum, but because its surface is often an oxide film protective layer can improve the corrosion resistance. 
RE aluminum alloy material is adding rare earth elements in aluminum, which can purify and improve the purity, fill surface defects, grain refinement. Reduce segregation, resulting in the elimination of microscopic uneven effect of localized corrosion, but also bring more negative electrode potential of aluminum, with a sacrifice anode effect and excellent electrical properties, thus greatly improving the corrosion resistance of aluminum. For the marine environment corrosion problems C1- and petroleum, chemical environment, S, H2S + C02, etc., this material has a unique anti-corrosion mechanism. Strong reduction of rare earth metals can be effectively combined with S, H2S, C1- strong oxidizing interactions generate stable compounds (C1- with aluminum to form a stable rare earth coordination compounds), chemical oxidation and reduction reactions process organic unity, interaction, as the oxidation activity S, H2S, C1- other corrosive media corrosion caused fundamentally destroyed, thus completely solved on a global scale in developed countries including the United States failed to properly solve the problem , the Beijing Nonferrous Metal Research Institute and other national inspection departments to detect and engineering data analysis examples show that chloride ions, water, ocean-atmosphere, salt spray environment (alternating wet and dry), saturated HzS, sulfur and high-temperature, high-pressure environment conditions in corrosion, the rare earth aluminum alloy was zero or nearly zero. 
2, the insulating part 
◆ power cable carrying capacity refers to the maximum allowable temperature, the cable allows the maximum current through the conductor. In the design and selection cable, the cable should be made of each part of the loss of heat generated does not exceed the allowable maximum temperature of the cable, in most cases, the transmission capacity of the cable is determined by the maximum temperature limit of the cable, the cable of the maximum allowable temperature, depends mainly on used to heat aging properties of insulating materials, because the cable operating temperature is too high, will accelerate the aging of insulation materials, large shorten cable life. If the cable runs over the allowable temperature, the cable will be 30 years safety work. 
◆ XLPE crosslinked polyethylene Abbreviation Name of the polyethylene is a linear molecular structure, easily deformed at high temperatures. XLPE process it into a network structure. This structure is the same even at a high temperature has a strong resistance to deformation. 
◆ anti-aging properties of crosslinked polyethylene excellent and superior heat distortion decided at normal operating temperature (90C) short-term failure (130C) and short (250C) conditions may allow a large current. Because of its higher operating temperature than PVC 20C, has excellent thermal properties, to increase the anti-aging properties of the insulation, which greatly increase the life span. 
 
Economic performance aluminum cables 
 
◆ direct procurement costs 
Aluminum cable and copper cable price comparison: aluminum cables with superior safety performance under electrical properties, mechanical properties and longer life premise, the price of aluminum cable is only about 75% of copper cables. 
◆ reduce installation costs 
Saving installation costs: Because aluminum cable bending performance and light weight, easy to install.

Pre: aluminum cable cost-effective projects favored by the new
Next:Aluminum cable standard has been submitted to the National Standards Committee