How Many Ways Can Conductors In The Cable Be Twisted?

The conductor is the main component of wire and cable products to play the use function of transmitting power or information, that is, to pass the current or electromagnetic wave on the conductor, and the optical cable is to transmit the optical fiber as a conductor.

The conductor structure includes shape, cross-section, composition, material, etc., depending on the function and application requirements of the product. The circular conductor structure includes round single wire, round stranded wire, compact stranded wire, and hollow stranded wire. Special-shaped conductor structure has fan-shaped, shingle-shaped, flat type, special-shaped, and coaxial cable outer conductor and waveguide and non-metallic conductor structure.

In the products of large lengths of wire and cable, because of the good bending or twisting performance of the round twisted wire, the structure of the round twisted wire will be considered more. Large square conductors will be composed of wire structures at different points of flexibility, most of which are made of smaller single wires.

Three ways of stranding a wire

1. Regular hinge

The single lines of equal diameter are arranged concentrically and twisted into several layers. The number of roots of each layer of single lines is fixed. For example, the number of roots in the central layer is i, and the number of single wires in the i layer is 6(i-1); that is, the wires with 1 central layer are 6 in the first layer, 12 in the second layer, and so on. From the center to the outer layer, the wires are 1+6+12+18+24+...

The total number of roots of a single wire in the center of a wire is Z=1+3i(i+1), where i is the number of layers.

2. Bunching

For conductors with good flexibility, there are many single wires, and since the diameter of the single wires is small, it is necessary to use a bundle to form the final wire through the wire matching die.

3. Retwist

The cross section of the retwisted wire is large, and the wires with more single wires must be twisted.

Regular stranding, using a single wire with the same diameter, is conducive to the production organization; the wire can be bent in any direction and is more stable; the shape of the wire after stranding is regular; and the outer diameter is consistent. The outer diameter of the stranded core is not very strict, and the shape is only approximately circular, relatively soft, but it can be basically controlled into a circle when extruded or packaged insulation.

There are many technical parameters of stranded wire; the important parameters are pitch diameter ratio, stranding rate, stranding direction, filling coefficient, and so on. When selecting the material of the cable conductor, it is necessary to consider its good electrical conductivity, good thermal conductivity, sufficient mechanical strength and elongation at break, and certain corrosion resistance. At present, the commonly used wire materials are copper and aluminum, of which copper wires are mostly.