同塔双回线路导线相序排列影响因素研究

Research on the Influences of Different Phase Sequence Arrangement of Common-tower Double-circuit Transmission Lines

随着负荷的快速增长,电网中出现大量的短距离不换位架设的同塔双回输电线路,由导线相序排列引起系统三相电流不平衡问题日益突出。本文利用PSCAD电磁暂态程序对500kV同塔双回输电线路不同相序排列情况下对不平衡电流、继电保护以及反击耐雷电流进行了研究;在此基础上提出一种基于不平衡电流、继电保护和反击耐雷水平的同塔双回输电线路导线相序排列的选择方法。

With the rapid growth of power load,large amount of short-distance untransposed common-tower double-circuit transmission lines are put into operation,thus,unbalanced three-phase current caused by phase sequence arrangement is increasingly serious. In view of the problem,PSCAD electromagnetic transient program is applied in the research of unbalanced current,relay protection and thunder-resisting current under different phase sequence arrangement,based on which,selection method for phase sequence arrangement of 500kV common-tower double-circuit transmission lines is proposed.