YJV power cable manufacturing process

Basic process flow

The manufacture of power cables includes many processes and can be generally divided into four main areas:

Conductor manufacturing, including 1) Drawing a wire to a desired diameter;

2) Stranding strands of multiple strands, sometimes requiring re-entrainment;

3) Combination in the manufacture of HV and EHV cables, stranding non-circular strands into a quasi-circular structure;

Insulated core manufacturing, including 1) Three-layer extrusion: Insulated cable cores are formed during this process, including the inner semi-conductive shield, the insulating layer and the outer semi-conductive shield;

2) Cross-linking: can be carried out directly after extrusion (peroxide cross-linking), or after extrusion using separate equipment (wet cross-linking);

3) Degassing: Removal of peroxide by-products by off-line heating, which is usually the basic process for HV or EHV cables, but is also often used for medium voltage submarine cables;

Cable sheath manufacturing, including 1) insulated wire core tape: In this process, the buffer layer, protective layer and water blocking layer are wrapped around the extruded insulation core;

2) Neutral wire stranding: Wrap the copper wire, copper tape or flat copper tape around the cable;

3) Metal sheath: moisture-proof and protective layer of metal;

4) Sheath: The use of a polymer sheath for mechanical protection (protection of metal foil is particularly important) and anti-corrosion effect;

5) Mounting: Use high-strength metal components (steel) to protect cables, especially submarine cables;

Quality control, including 1) raw material handling;

2) routine tests;

3) sampling test;

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