Guangxi power cables are usually composed of three parts: core, insulating layer  protective layer. The wire core is used to conduct electricity; the insulating layer is used to insulate the wire core conductor  the protective layer to prevent leakage; the protective layer is used to prevent the cable insulation layer  being injured  damp,  to prevent the outflow of liquid insulation (insulating oil).Guangxi cable manufacturer

There are two types of cores: copper core  aluminum core. The cross-sectional shapes of the wire cores are circular, semi-circular  fan-shaped. Three-core  four-core low-voltage cables mostly use fan-shaped cores. According to the different varieties  specifications of the cable, the core can be made into a single-strand entity,  it can be made into a stranded core. The stranded core is twisted  round single wire  shaped single wire.

Features of various insulation structures: (1) Oil-paper-insulated cables are mainly divided into two types: viscous impregnated paper insulation  non-dribbling, usually used in 3-35KV systems. Adhesive impregnated paper insulated cable: simple structure, easy to manufacture, low price, easy to install  maintain, long life;  suitable for high drop laying,  the insulating oil is easy to flow. Impregnated paper insulated cable without dripping; the cost is slightly higher than that of viscous paper insulation, the working life is longer,  it can be laid with high drop. (2) The common plastic insulated cables are PVC, polyethylene  cross-linked polyethylene cables.

1) PVC insulated cable. The installation process is simple, the laying  maintenance are convenient, it can be adapted to high drop laying,  it is non-flammable; the working temperature has a significant impact on its mechanical properties. Usually used in 6KV  below systems.

2) Polyethylene insulated cable. It can be applied to high drop laying, with good process performance  easy processing, but it is easy to delay combustion, easy to deform when heated,  prone to stress cracking. Used less often.

3) XLPE cable. The XLPE cable has a higher allowable temperature rise, so the allowable current carrying capacity is larger,  the heat resistance performance is good. XLPE cables are now more  more widely used  are suitable for various voltages.

(3) Rubber insulated cable

Rubber insulated cables have good flexibility, are easy to bend  have elasticity,  are suitable for circuits that are disassembled  assembled many times. However, they have poor resistance to corona, ozone, heat  oil, so they can only be used as low-voltage cables. Protective layer structure In order to prevent mechanical damage, electrochemical corrosion  moisture intrusion, the cable core  insulating layer of power cables have a strict protective layer. Now take the XLPE insulated  PVC sheathed power cable as an example to illustrate the protective layer structure of the power cable.Guangxi wire cable

The outer surface of the conductor is covered with a semiconductor shielding layer, which is called the inner semiconductor shielding layer, which is used to prevent the electric field decomposition  corrosion caused by the long-term action of the conductor electric field on the XLPE insulation 3. The XLPE insulation 3 is also covered with a layer of semiconducting shielding, called the outer semiconducting shielding layer.

In addition to the outer semiconductor shielding layer, there is a layer of copper tape shielding,  their functions are to weaken the effect of the external electric field on the cross-linked polyethylene to ensure good insulation performance. The copper tape shield also serves as a soldering point for the protective grounding of the cable. In addition to the copper tape shielding, the three cores are filled with fillers,  the outer layer is a three-phase turnkey ladle tape  a PVC outer protective sheath.Guangxi cable

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