Aluminum alloy overhead stranded wire belongs to the original wire. China generally uses aluminum-clad steel strands (LGJ) as wires. The steel core mainly plays the role of improving the strength, and the aluminum stranded wire mainly plays the role of transmitting electricity. Depending on the voltage, the wire cross section varies. For example, the conductors of domestic 500kV transmission lines are generally LGJ-400/35 conductors. l is the abbreviation of aluminum wire, G is the abbreviation of steel core, J is the abbreviation of stranded wire, 400 is aluminum 400 square millimeters, 35 is steel 35 square millimeters.

　　What is the structure of aluminum alloy overhead strand?

　　1 aluminum stranded wire

　　1.1 The number and nominal diameter of aluminum wires in the kink shall meet the requirements in Table 2.

　　1.2 The kink pitch ratio shall comply with the provisions of Table 3.

　　The pitch diameter ratio is the ratio of the shaft length of the complete helix formed by one of the strands to the outer diameter of the helix.

　　The pitch diameter ratio of any kink layer cannot be greater than the pitch diameter ratio of the adjacent inner layer.

　　The twist of adjacent layers is opposite, the outer one is the right side.

　　2 steel core aluminum stranded wire

　　2.1 The number and nominal diameter of aluminum wires and wires in the kink shall meet the requirements in Table 4.

　　2.2 The kink pitch ratio shall comply with the provisions of Table 5.

　　The pitch ratio of the twisted aluminum wire or wires, respectively, shall not be greater than the pitch ratio of the adjacent inner layers.

　　The strands of adjacent layers should be reversed, with the outer layer of aluminum strands on the right.

　　3 anti-corrosion steel core aluminum stranded wire

　　According to user requirements, anti-corrosion paint can be evenly applied between the designated layers of the ACSR.

　　What is the packaging mark of aluminum alloy overhead strand ?

　　The kinks of the aluminium alloy overhead strands are delivered in trays with a distance of more than 30mm between the outer layer and the edge of the side panel of the cable tray, and packaged appropriately.

　　The two strands of kink that join cut more than half of the aluminum wire at the junction and tie the sides of the junction firmly together. The cable tray conforms to the provisions of GB4005-83 "Wire and Cable Delivery Tray". Short short-circuit strands can be delivered in circles, with at least three ties per wheel, and packaged appropriately. Label each plate or string. show:

　　A. Manufacturing plant name

　　B. Kink Model and Specifications, mm2

　　C. The length of each kink from outside to inside, m;

　　D. Gross weight and net weight, kg;

　　E. Date of manufacture: year and month;

　　F. This standard number: GB1179-83.

　　In terms of electrical properties of aluminum alloy overhead stranded wire , after the conductor is energized, the resistance will consume electricity and generate heat. Rising temperatures can affect the performance life of insulating and protective layer materials. In order to effectively operate the cable, it is necessary to increase the conductor cross section, but the single wire with large cross section is not easy to bend, has poor flexibility, and is not conducive to production, transportation and installation. Mechanically, flexibility, reliability and multiple single wires are also twisted together

　　But turning around is also very depressing. First, a twisted kindness (like a single-line cross-section) resists a lot. When kinked, there are gaps between the cores, and the cores are uneven and smooth, which is easy to cause electric field concentration under high voltage conditions, resulting in discharge. Therefore, the stranded wire must be tightened under high pressure. At the same time tightening, the gap between the good hearts when twisting the wire also helps prevent pitcher incidents