The conductor of bus duct is copper or aluminum. The service life of bus duct depends on its operating temperature. The higher the operating temperature is, the faster the aging speed will be (including copper, aluminum bars and insulating materials. The creep strength, tensile strength and oxidation speed of electrical copper and aluminum used for conductors are closely related to temperature). Because the design structure and heat dissipation of the bus are different, the internal temperature is also different. According to the conductor table in the design manual, the ambient temperature is 35 ℃. The dense bus duct with good heat dissipation can meet the temperature rise of ≤ 70K only by reducing the current carrying capacity by 5% ~ 15%. The dense bus with poor heat dissipation should be reduced by about 20%, and the current carrying capacity of air bus should be reduced more. The strength of copper aluminum composite interface directly affects its processing performance and service reliability. It is a key performance parameter of copper aluminum composite bus. It can be used in electrical equipment only when there is no blistering and obvious orange peel during 90 ° bending, and there is no copper aluminum delamination during punching and shearing, so as to meet the lower requirements of interface bonding strength. The interfacial bonding strength is different with different manufacturing processes. With the application of heat exchange and conduction technology in bus duct, the insulated conductor has heat transfer contact with the shell, resulting in a fully enclosed bus duct, which meets the user's requirements. Using special processing technology, a hard copper composite cladding is formed on the overall surface of aluminum conductor, and its mechanical and electrical properties can be equal to that of copper conductor; The soft tin coating regenerated on the surface of copper aluminum composite further enhances the oxidation resistance and power on quality of the conductor. Ultra light weight aluminum.