What is the basic structure of a power cable?

I. What is the basic structure of a power cable? The third side of the power supply is the core (conductor). The outer side of the core is phase insulation and filler, and the outer side is three-phase turnkey insulation. Unity package insulation covered with a lead package, the lead package outer layer of steel armor, PVC sheath and other protective layers.1. The permissible value of the bending radius of the power cable. Bending radius of the cable and its diameter, the bending radius of the permissible value expressed as a multiple of the cable diameter is not less than: three-core oil-immersed insulated cable for 15 times, single-core cable for 25 times; oil-impregnated paper insulated lead-packed cable warping higher than 30 times 40 mm, less than 25 times 40 mm; rubber-plastic insulated cable is 10 times. 2. Power cable shielding and grounding line. The shielding layer is divided into inner shielding and outer shielding. They are designed to make the cable conductor and insulation, cable insulation and inner sheath contact is good, to eliminate the conductor and the inner sheath surface is not smooth caused by the increase in surface electric field strength. The surface of the conductor is usually wrapped with metallized paper tape or semiconductor paper tape. The purpose of installing a grounding wire in the cable is to protect the cable from insulation breakdown or large fault current through the core, the induced voltage of the metal sheath may cause insulation breakdown, arcing and burning of the metal sheath.3. The basic structure of the power cable. The outer sheath of the cable is generally composed of three parts: inner sheath, armored sheath and outer sheath. The liner is located between the armor layer and the inner sheath, and its role is to prevent the cable from bending the inner sheath is corroded and the inner sheath is damaged by the armor layer. The armor layer is outside the inner liner, and its role is to reduce the impact of mechanical forces on the cable, so that the mechanical forces acting on the cable are borne by the armor layer. The outer coating is outside the armor layer, and its role is to prevent the armor layer from being eroded. Therefore, the function of the outer sheath of the power cable is to protect the inner sheath from external influences and mechanical damage.

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