The main function of cable armoring and stranding

Armoured xlpe power cable refers to a cable with an armored protective layer of metal material, which contains the steel wire and steel tape. The purpose of adding an armored layer to the xlpe power stranded electrical wire is not only to enhance the mechanical protection such as tensile strength and compressive strength to prolong the service life, but also to improve the anti-interference performance of the xlpe power stranded cable through shielding protection.

Commonly used armoring materials are steel tape, steel wire, aluminum tape, aluminum tube, etc. Among them, the steel tape and steel wire armoring layer has high magnetic permeability and good magnetic shielding effect, which can be used for anti-low frequency interference, and can make the armored wire for cables directly buried and laid without the need to wear pipes and are cheap and high-quality in practice.

The copper stranded electrical wires of different specifications and different numbers are twisted together in a certain arrangement order and laying pitch, and they become conductors with larger diameters. The copper stranded electrical wire is softer, and the final armoured cable for outdoor socket has good bending performance, and it is not easy to break during the swing test. It is easier to meet the requirements for some stranded electrical wire that require flexibility (for example, medical grade wires).

From the perspective of electrical performance: after the conductor is energized, the resistance consumes electricity and generates heat. As the temperature rises, the performance life of the insulating layer and protective layer materials of 2.5mm 3 core armoured cable will be affected.

In order to make the armoured xlpe insulated stranded electrical wire run efficiently, the conductor cross-section should be increased, but a single stranded electrical wire with a large cross-section It is inconvenient to bend and has poor flexibility, which is very unfavorable for production, transportation, installation and laying. In terms of mechanical properties, flexibility and reliability of armoured cable for outdoor socket are also required. Multiple single xlpe electrical stranded wires are twisted together and twisted together to solve the contradiction.