Select wire cross-section (safe current carrying capacity) based on heat generation conditions at close distances and low loads; control the current using the wire's heat generation conditions. Smaller cross-sectional area results in better heat dissipation, allowing for higher current density within the same unit area.
For long distances and medium loads, the conductor cross-section is selected based on voltage loss conditions, in addition to the safe current carrying capacity. Simply not generating heat for long distances and medium loads is insufficient; voltage loss must also be considered. It is essential to ensure that the voltage at the load point remains within the acceptable range to allow electrical equipment to operate normally. Aviation Power Supply
Under the premise of meeting the safety load current and voltage drop requirements, the selection of the economic current density considers power loss, ensuring that both power loss and capital investment remain within a reasonable range. What is the safe load current for conductors? The safe load current is the allowable current density to ensure the long-term continuous operation of the conductor. Generally, copper wire is selected at 5 to 8 A/mm², and aluminum wire at 3 to 5 A/mm². The safe load current must also be determined based on a comprehensive assessment of factors such as the maximum temperature of the conductor's core wire, cooling conditions, and installation conditions. In general, for short distances, small cross-sectional areas, good heat dissipation, and low temperatures, the conductor's conductivity is stronger, so the safe load current is selected at the upper limit. Conversely, for longer distances, larger cross-sectional areas, poor heat dissipation, high temperatures, and poor natural conditions, the conductor's conductivity is weaker, so the safe load current is selected at the lower limit. Additionally, in terms of conductivity, bare conductors are stronger than insulated conductors, overhead lines are stronger than cables, and cables buried underground are stronger than those laid on the ground, etc. 400HZ power source
