中低压铜芯电缆经济电流密度的更新与分析

在过去几年中，铜价上升的幅度很大，导致铜芯电缆成本成倍增长，经济截面有减小的趋势，因此以前确定的经济截面是否仍满足载流量要求有待验证．对中低压铜芯电缆的材料费等原始数据进行了系统的收集和整理，据此更新了经济电流密度数据，并通过引入电缆类型系数，使得经济电流密度数据得以更加简洁，进而方便查阅．再者，结合实例分析了更新后的经济电流密度的稳定性，考察了更新前后经济电流密度的变化情况，验证了更新后的经济选型数据的经济性和准确性．

Update and analysis of economic current density for medium and low voltage copper cables

The ever-increasing copper price in the past several years has led to a significant increase of the cost of copper cables, and the economic section has hence decreased. Thus, whether the economic secfion obtained from past data could still meet the current carrying capacity is becoming a matter to be investigated. The recent cost data associated with medium and low voltage copper cables are collected and handled, and then as the basis for updating the economic current density data in this paper. To facilitate the use of the economic current density data, a cable type parameter is introduced. In addition, the stability and accuracy of the updated economic current density data are verified by using actual data.