Pre twisted wires are used as connection fittings for overhead power lines, as well as for power overhead optical cable terminals, suspensions, joints, etc. Pre twisted wire first appeared in the United States in the 1940s and 1950s. Its initial product was a spiral protective wire used for protecting stress concentration areas of bare wires, as well as locations affected by electrical corrosion and arc damage. After years of development, pre twisted wire fittings have been widely used in fields such as power transmission and distribution, fiber optic communication, electrified railways, cable television, construction, and agriculture.
Steel cored aluminum wire is a mainstream wire widely used in 10 kV distribution network lines. It has a series of advantages such as high tensile strength, good lightning protection performance, and low cost, and is widely used in suburban joints and rural power grid lines. However, once the steel core aluminum wire line is damaged by external forces or affected by harsh weather conditions, it is highly prone to wire mixing and short circuit faults. After a mixed short circuit occurs, the wire will experience a broken strand phenomenon. If this situation is discovered, appropriate wire repair treatment must be given in a timely manner to avoid the continued scattering of strands, which may lead to a decrease in the mechanical and conductive properties of the wire.