It consists of several single wires

 

Generally speaking, there are many and thin single wires forming the stranded wire, which not only increases the flexibility of wires and cables, but also improves the reliability of line connection. Some cable conductors do not require large cross-section, but they are also twisted to have better flexibility or high reliability, so the twisted wire occupies an important position in the wire and cable.

 

The overhead line in the bare stranded wire is a main electrical equipment in the power transmission and distribution network, which makes the power station (plant) connect with users through all levels of substation devices. Power cable and electric equipment wire and cable are widely used in industrial and mining enterprises, cities and rural areas, and are indispensable products in production and life. Many of the conductors of these wires and cables are stranded. The most basic method of making stranded wire is "stranding". The stranding process is an important link in the production of bare wire and insulated wire and cable, and the stranding principle and method are also applied to the stranding of wire and cable insulation core and steel wire armor. The technology of wrapping and weaving in the production of wires and cables is also closely related to this. Therefore, the stranding process is a basic process widely used in wire and cable production technology.

 

Main performance of single wire

 

In electrical aspect, there are resistance coefficient (resistivity), resistance temperature coefficient, etc. in physical and mechanical aspects, there are tensile strength, elongation, bending energy, etc. According to the situation, corona test and current carrying capacity test are often carried out in the electrical field. J in the physical and mechanical field, there are determination of total breaking force, elastic coefficient, thermal expansion coefficient, creep and vibration resistance test, etc.