The choice of cable cross-sectional area is related to the investment, 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 drop and the line loss will be too large, which will make the initial investment too high.
Therefore, according to the load forecasting results, the development plan should be selected to select the appropriate cross-sectional area.
So that the power cable meets the core temperature requirements and voltage drop requirements under the maximum operating current, and the thermal stability requirements under the maximum short-circuit current.
Because the load forecasting work is difficult and the accuracy is low, when selecting the cable cross-sectional area, it must meet the requirements of the “Technical Guidelines for Urban Medium and Low Voltage Distribution Network Reconstruction” and “Urban Power Network Planning Guidelines”.
When selecting a power cable for a three-phase four-wire low-voltage power grid, the choice of the zero-line cross-sectional area should also be considered.
In the public low-voltage network, due to the influence of user factors, the three-phase load balance is difficult to control, in order to improve the voltage quality and reduce Line loss, the cross-sectional area of the zero line should be the same as the cross-sectional area of the phase line.
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