非全线同塔双回架设的1000kV换位线路电流不平衡度研究

在地形复杂或覆冰较严重处,输电线路无法采用全线同塔双回的方式架设,而采用并行单回架设的线路段时需研究其对全线三相电流不平衡的影响。对此,在推导电流不平衡度计算方法的基础上,通过ATPEMTP仿真建模计算,研究了有一个整循环换位的1 000kV双回分段架设线路中相序排列、换位方式及单回线路段的首尾连接方式、回间距离等因素对电流不平衡度的影响,得出了较优的换位、相序排列组合方案及单回线路段连接方式,并总结了单回线路段的回间距离对线路电流不平衡度的影响规律,对改善实际非全线同塔双回架设的线路中出现的电流不平衡问题有参考意义。

Analysis of Current Imbalance in 1 000 kV Double-circuit Lines with Part Erecting on Parallel Single-circuit Towers

In areas of complex topography or more severe icing, transmission lines can not be constructed with double-circuit tower along the whole line. It is necessary to study the impact of parallel single-circuit lines on the three-phase current unbalance. Through deriving the current imbalance calculation method and simulating by ATP-EMTP model, this paper studies the impacts of the factors including phase sequence arrangement, transposition mode, connection type of single-circuit line segment and distance between two single-circuit lines in the 1 000 kV double-circuit line with a whole cycle of transmission. The calculation results gives a more optimized phase sequence arrangement and better single-circuit line segment connection type, and the impact law of the distance between the single-circuit line on the line current imbalance. The research of this paper will be meaningful in inhibition of the current imbalance in the actual lines.