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Wire manufacturers to talk about wire and cable shielding layer

Wire manufacturers say about the problem of shielding layer in wire and cable, the so-called “shielding” in cable structure is essentially a measure to improve the distribution of electric field. The conductor of cable is made of stranded wire, which is easy to form an air gap with the insulation layer, and the surface of the conductor is not smooth, which will cause the concentration of electric field.

A shielding layer of semiconductor material is added on the surface of the conductor, equipotential with the shielding conductor, and good contact with the insulation layer, to avoid partial discharge between the conductor and the insulation layer. This shield is also called the inner shield. Gaps may also exist at the contact between the insulating surface and the sheath.

When the cable is bent, the insulation surface of oil-paper cable is easy to crack. These are all factors that cause partial discharges. A semi-conductive material shielding layer is added on the surface of the insulation layer, which is in good contact with the shielding insulation layer and equipotential with the metal sheath to avoid partial discharge between the insulation layer and the sheath.

The cable shield can also serve as grounding protection. If the cable core is damaged, the leakage current can flow along the shield like a grounding net, playing a role of safety protection.