Core standard for insulated power cords and cables

The current density of the copper core insulated wire of the power cord can be selected according to 2-5 A/mm: when the current passing through the wire is not more than 40A, the current density is 5-4A/mm; when the wire current is 41-100 A . Take the current density as 3-2 A/m; when the wire current is greater than 100 A, take the current density as 2 A/mm (in this case, you should check the product manual to determine the cross-sectional area of ​​the wire core).

The nominal cross-sectional area (unit is mm) of the core of the insulated wire is: 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, etc. If the cross-sectional area of ​​the wire core required by the power line is less than 6mm, the cross-sectional area of ​​the wire core should be 10mm in consideration of the mechanical strength.

The electrical parameters of XLPE insulated cables mainly include parameters such as effective resistance (AC resistance), inductance, insulation resistance and working capacitance. These parameters determine the transmission capacity of the cable, and other properties of the cable are determined or calculated by these parameters. As long as the characteristic parameters (such as dielectric constant, resistivity, etc.) and geometry of XLPE insulated cable materials are certain, these parameters will be determined accordingly. However, before understanding these electrical parameters, it is necessary to have a clear understanding of the electric field distribution of XLPE insulated cables, and to understand the similarities and differences between them and oil-paper cables, so as to facilitate the use of XLPE insulated cables in the future.