Aluminum stranded wire and steel-cored aluminum stranded wire have the advantages of simple structure.convenient erection and maintenance, low cost of line, large transmission capacity, and are conducive to laving acrossspecial geographical conditions such as rivers and valleys. They have good electrical conductivity and sufficientmechanical strength, high tensile strength, and can be amplified by the distance of the tower. Therefore, they are widelyused in overhead transmission and distribution lines of various voltage levels.