The selection of the cable cross-sectional area is rela […]
The selection of the cable cross-sectional area is related to the amount of capital contribution, the loss of the line and the voltage quality, and the service life of the cable. If the cross-sectional area is too small, the voltage quality will be reduced, the line loss will be too large, and the cable will be overheated and burnt. If the cross-sectional area is too large, the initial investment will be too high. Therefore, based on the results of the load guessing, use the developed vision to select the appropriate cross-sectional area, so that the power cable is satisfied with the core temperature request and voltage drop request under the maximum operating current, and the thermal stability request under the maximum short-circuit current. Because the load guessing operation is difficult and the accuracy is low, when selecting the cable cross-sectional area, it is also satisfied with the request for "Urban Medium and Low Voltage Distribution Network Transformation Skills Guide" and "Urban Power Network Planning Guidelines".