How is the structure and role of the outer sheath of power cables?

I. How is the structure and role of the outer sheath of power cables?
Cable outer sheath is generally composed of three parts: inner liner layer, armor layer and outer being layer. The liner layer is located between the armor layer and the inner protection layer, its role is to prevent the inner protection layer from corrosion, and prevent the inner protection layer in the cable bending by the armor layer damage. Armor layer in the liner layer outside, its role is to reduce the impact of mechanical forces on the cable, so that the mechanical forces acting on the cable by the armor layer to bear. The outer being layer is outside the armor layer, and its role is to prevent the armor layer from erosion. Therefore, the role of the outer armor layer of the cable is to protect the inner armor layer from external influences and mechanical damage.

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