The difference between wire and cable concentric layer stranding (regular stranding) and beam stranding
一、 Overview of Conductor Stranding
The so-called twisting is to twist several single wires of the same diameter or different diameters together according to a certain direction and certain rules to form a whole twisted core. Since a single wire is not easy to bend and has poor flexibility, it brings difficulties to production, transportation, installation, laying and use; second, the cross-section of a single wire is large, and the eddy current loss is large, which affects the power transmission effect. The use of conductor stranding effectively avoids these problems. Stranded wires can also be used directly as wires, which are called bare stranded wires, such as steel-cored aluminum stranded wires, aluminum-clad steel-cored aluminum stranded wires, etc.; when stranded wires are used as conductors of insulated wires and cables, they are called Stranded core is the main component of insulated wire and cable.
二、Conductor Stranding Form
Conductor stranding includes conductor stranding and bundles, and its stranding forms are mainly divided into two types: regular stranding and irregular stranding (bundling).
Regular stranding can be divided into two types: regular concentric single wire stranding and regular concentric strand stranding (complex stranding). Regular concentric single-wire stranding can be divided into two types: ordinary strands (copper, aluminum strands) and combined strands (steel-cored aluminum strands).
1. Regular stranding can be divided into regular concentric single-wire stranding and regular concentric strand stranding. Regular concentric single-wire stranding:
(1) Ordinary twisted wires: single wires of the same diameter are regularly twisted layer by layer in the form of concentric circles, and the twist direction of each layer is opposite.
(2) Combined stranded wire: It is made of single wires of the same diameter and different materials or different diameters and different materials. (representing products such as overhead conductors)
(3) Regular concentric strand stranding: It is a twisted wire that is concentrically twisted by multiple ordinary strands or bundled wires.
2. Irregular twisted (bundled wire): a twisted wire made of multiple single wires twisted together in the same twist direction without following the twisting rules. Keep it round.
The biggest difference between bundled wire and ordinary stranded wire is that each monofilament of ordinary stranded wire has a fixed position, which is regularly twisted layer by layer; there is no fixed position between the monofilaments of bundled wire. twisted together according to the law.
The characteristics of irregular stranding (bundle wire): Since each single wire in the bundle wire is twisted in one direction, the sliding margin between each single wire is large during bending, and the bending resistance is small, so the bending performance of the bundle wire is particularly good , for wire and cable products that need to be flexible and used in frequent moving occasions, bundled wires are used as conductive cores，such as concentric cables.
三、The characteristics of the conductor stranding system
1. Good flexibility
Since the wires and cables are used in different occasions, the current carrying capacity is different, and the cross-section of the wires is also large and small. Conductor stranding adopts a core made of multiple smaller-diameter monofilament strands, which can improve the bending ability of the cable and facilitate the processing, manufacturing, installation and laying of wires and cables.
2. Good stability
A core made of multiple monofilaments stranded according to a certain direction and twisting rules. Since the position of each monofilament in the stranded wire is in the elongation zone above the stranded wire and the compression zone below the stranded wire in turn, when the stranded wire When the wire is bent downward, each single wire is subjected to equal elongation and compression forces, so no deformation occurs.
3. Good reliability
Using a single wire as the conductor of a wire and cable is susceptible to the inhomogeneity of the material or the defects in the manufacturing process that affect the reliability of a single conductive core. Using multiple single wires to twist the core, such defects can be dispersed without It will be concentrated on a certain point of the wire, and the reliability of the wire is much stronger, especially at the joint of the wire.
4. High strength
Compared with a single wire with the same cross-section size and multiple twisted wires, the strength of the twisted wire is higher than that of the single wire with the same cross-section.
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