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Copper-aluminum composite busbars are commonly known as copper-clad aluminum busbars, copper-clad aluminum bus bars in Chinese literature, and Copper-clad aluminum bus bars in English. The current main implementation standard is the People's Republic of China Electric Power Industry Standard DL/T 247-2012 "Copper Clad Aluminum Busbars for Power Transmission and Transformation Equipment" promulgated by the National Energy Administration on April 6, 2012 and implemented on July 1 of the same year. In 2014, the General Administration of Inspection and Quarantine and the National Standardization Administration promulgated and implemented GB/T 30586-2014 "Continuous Casting and Rolling Copper Clad Aluminum Flat Bars and Flat Wires".
Copper-aluminum composite row (also called copper-clad aluminum row)
The copper-aluminum composite row is a kind of aluminum as the base body, and the outer layer is coated with copper. According to its manufacturing process, it can be divided into: cladding welding method is a method of preparing copper clad aluminum wire at home and abroad. Some domestic enterprises use this process to make copper clad aluminum bars. This method uses flat and vertical rollers to press the same core. , Coat the copper strip concentrically on the aluminum bar, then perform argon arc welding on the longitudinal seam, and then go through stretching and annealing. In the rolling and pressing method, the cleaned copper strip is crimped on the aluminum plate from the upper and lower wide sides, and the copper strip and the aluminum plate are crimped together by the pressure of the roller, and then the copper strip and the aluminum plate are press-fitted together, and then subjected to correction or further treatment and annealing. Hydrostatic extrusion method, die casting and rolling direct forming method, the die casting and rolling direct forming process developed by Huatong Company, copper and aluminum are solid-liquid combination, and a good composite layer is formed through special process treatment. The composite layer is formed by the large-area diffusion of the copper layer melted by aluminum, copper and aluminum, which truly realizes the metallurgical bonding. This method is thicker than the solid phase bonding composite layer and has higher bonding strength. The cleaned aluminum rod is penetrated into the cleaned copper tube to make a composite blank, which is put into the hydrostatic extruder, and the high hydrostatic pressure and large processing deformation rate are used to realize the metallurgical combination between copper and aluminum. Aluminum core and copper tube, remove the oxide film on the outer surface of the aluminum core and the inner surface of the copper tube, press the aluminum core into the copper tube, stretch or roll the solid phase combination between the copper tube and the aluminum core, and pull it into the required shape , So that they form a permanent interatomic diffusion bonding bimetal, with bright, round and defect-free surface. It is a new type of conductor material that combines the high-quality and stable electrical conductivity of copper with the low-cost energy of aluminum with low contact resistance. It can fully replace pure copper bars. Copper accounts for 20% of the proportion and aluminum accounts for 80%. Under the same specification, it is 2.5 times longer than pure copper bars. The current carrying capacity is 85% of pure copper bars. Choose a slightly larger specification It can fully achieve the same current carrying capacity and meet the customer's technical requirements for wire diameter and mechanical and electrical performance.
Advantages of copper clad aluminum busbar
1. Low density and light weight. The proportion of copper clad aluminum row is only 44% of pure copper row
2. Good electrical performance, current-carrying capacity is 86% of pure copper bar.
3. Saving copper with aluminum is an energy-saving and environmentally friendly green product.
4. It has good tensile strength, flexibility and elongation.
5. The surface is the same as the pure copper row, with sufficient strength, oxidation resistance and corrosion resistance.
Application field
Switchgear
Control cabinet
transformer
Safety switch
Vacuum switch
Relay system
Motor Control Center
Rail power supply system
Electrode correction coil
Windings such as reactors
Railway traction equipment
High, middle and low voltage distribution cabinet
Generator sets and substations
Various copper-aluminum transition joints
High and low voltage distribution cabinet conductive row
High and low voltage bus bar, bus bar, contact slip line
