低压配电线路阻抗测量与性能分析

Impedance Measurement and Performance Analysis of Low Voltage Distribution Line

针对中海油典型低压配电系统进行阻抗测量与性能分析。首先,在现场选取两种电缆导线样本,通过阻抗实验测量相关参数;其次,根据变电所至低压设备的布局图,以及变电所和低压设备之间的距离图纸,计算配电线路距离,并结合实际工况估算配电线路系统的阻抗特性;最后,提出降低阻抗的技术和措施,并采用经济电流法计算出经济电流截面积。该分析为电力系统线路老化预判和风险预估提供数据支持。

In this paper,the impedance measurement and performance analysis of CNOOC’s typical lowvoltage distribution system were carried out.Firstly,having two kinds of cable wire samples selected in-situ and relevant parameters measured through the laboratory impedance experiment;secondly,having the layout diagram of the substation to low-voltage equipment and the distance drawing between the substation and low-voltage equipment based to calculate the distance of distribution line and the impedance characteristics of distribution line system estimated according to the actual working conditions on the site;finally,having the technology and measures of reducing impedance put forward and the economic current sectional area calculated by using the economic current method.The analysis results provide the supporting data for predicting the power line aging and the risk estimation.