Wrap a layer of non-conductive material evenly and tightly around the wire. Wires such as resin, plastic, silicone rubber, PVC, etc. that form an insulation layer to prevent electrical leakage, short circuit, electric shock, and other accidents caused by contact between the conductor and the outside world are called insulated wires. The commonly used categories of conductors are BV and BVB. The two types of overhead insulated conductors are: single-layer or multi-layer aluminum stranded wires twisted on top of which the insulation layer is extruded. The so-called overhead line is relative to the cable, which refers to the line where the wires are erected by the tower at a certain height to transmit electrical energy. For high-voltage transmission and distribution network overhead lines, the ground insulation is generally relying on air. Previously, distribution lines (except for 380V below 10kV) generally used bare conductors. However, due to the complex distribution environment in urban areas, short circuit grounding and lightning strikes often occur, resulting in a decrease in power supply reliability. Therefore, currently, overhead lines below 10kV generally use insulated conductors (i.e. the outer layer of the conductor is wrapped in an insulation layer), which is called insulated overhead lines. Steel core aluminum stranded wire is a reinforced conductor with a single or multiple layer of aluminum stranded wire twisted outside the galvanized steel core wire. Steel core aluminum stranded wire is made by twisting aluminum wire and steel wire, suitable for use on overhead transmission lines. It has a steel "core" inside and aluminum wires wrapped around the steel core through twisting on the outside; The steel core mainly serves to increase strength, while the aluminum stranded wire mainly serves to transmit electrical energy. Steel core aluminum stranded wire has the characteristics of simple structure, convenient installation and maintenance, low line cost, large transmission capacity, and is suitable for laying under special geographical conditions such as crossing rivers and valleys. It also has good conductivity and sufficient mechanical strength, high tensile strength, and can be enlarged in tower distance. Therefore, it is widely used in various voltage levels of overhead transmission and distribution lines
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