Steel-cored aluminum stranded wire is an overhead transmission conductor composed of a steel core and aluminum stranded wires, primarily used in high-voltage and ultra-high-voltage transmission lines. Its internal galvanized steel core primarily bears mechanical strength and withstands external loads such as the conductor's own weight, wind, and snow. The external structure, composed of multiple strands of hard aluminum wire, is responsible for conductivity and energy transmission. This structure achieves the complementary advantages of "aluminum conducting electricity and steel bearing strength," possessing both high conductivity and high tensile strength, and is widely used in long-span transmission scenarios such as crossing rivers and valleys.
According to national standards, its model is usually represented in the form of "JL/G1A-XXX/XX," where "JL" represents aluminum stranded wire, "G" represents steel core, and "1A" represents ordinary strength steel core. The following numbers represent the nominal cross-sectional area (unit: mm²) of the aluminum and steel, respectively. For example, JL/G1A-150/25 indicates a steel-cored aluminum stranded wire with an aluminum cross-section of 150 mm² and a steel cross-section of 25 mm².
This conductor features simple structure, low cost, large transmission capacity, and high tensile strength, making it one of the most commonly used overhead conductors in current power systems. With technological advancements, improved models such as expanded diameter steel-cored aluminum stranded wire (LGKK) and heat-resistant aluminum alloy types have been developed to meet special needs such as high altitudes, heavy icing areas, or capacity expansion upgrades.