ACSR Model Specification
LGJ is the symbol of steel core aluminum stranded wire, where L is the abbreviation of aluminum wire, G is the abbreviation of steel core, and J is the abbreviation of stranded wire.
240 / 40 refers to the nominal cross section of the conductor is: aluminum 240 square mm, steel 40 square mm; the structure of the wire is 26 aluminum, 3.42 square mm in diameter, 7 steel, 2.66 square mm in diameter; the calculated section of aluminum is 238.85 square mm, the calculated section of steel is 38.90 square mm, and the total calculated cross section is 277.75 square mm, the calculated cross section of aluminum is 238.85 square mm, the calculated section of steel is 38.90 square mm, and the total calculated cross section is 277.75 square mm.
The outer diameter of the wire is 21.66 mm; the DC resistance of the wire is not more than 0.1209 Ω/km; the rated tensile force is 83370 N (Newton); the unit mass is 964.3 kg/km; the manufacturing length is 2000 m; the short-circuit current is changed with the location of the access system and the equipment of the access system, and the complete wiring diagram must be provided to obtain the short-circuit current according to the calculation; the impedance of the line also varies with the way the line is erected. It must also be calculated according to the drawings.
For transmission lines above 10kV, aluminum clad steel strands (LGJ) are commonly used as conductors in China, that is, steel wires are wrapped with aluminum wires, which are used to transfer current and aluminum wires are used to reduce corona and other losses.
According to the voltage, the cross section of the conductor increases gradually. For example, the current high-voltage 500kV transmission line conductors generally use LGJ-400/35 conductors.