同塔双回线路不平衡电流及相序优化布置的研究  

Study on Unbalanced Current and Optimization of Phase Sequence for Double-circuit Line on Same Tower

作　　者：陈兆雁[1] 徐昊亮[1] 田云飞[1] 宋汶秦[1] 靳攀润 刘明[2] 

机构地区：[1]国网甘肃省电力公司经济技术研究院,甘肃兰州730050 [2]武汉大学电气工程学院,湖北武汉430072

出　　处：《陕西电力》2016年第12期45-48,共4页Shanxi Electric Power

基　　金：中央高校基本科研业务费专项基金资助项目(2015207020255)

摘　　要：同塔双回线路具有节省线路走廊、减少电力投资、增大输电容量等优点,而不换位输电线路会引起较大的不平衡电流,造成继电保护装置误动。通过建立同塔双回线路数学模型,给出了不同相序下计算不平衡电流的方法,详细分析了330 kV同塔双回不换位线路不平衡电流各序分量所占的比重,并在MATLAB平台上编制了计算软件。通过对各类相序布置下平衡度的比较,提出了依据地表电场强度选取同相序或逆相序的布置方案。Double-circuit line on same tower has some advantages, such as saving line corridor, reducing power investment and increasing transmission capacity and so on,but untransposed transmission line may cause a large unbalanced current, resulting in relay protection misoperation. The paper establishes the mathematical model of the double-circuit transmission line o,1 the same tower, anti deduces tile unbalance current in different phase sequences. Meanwhile, the paper analyzes the ratio of sequence- component to the unbalanced current in 330 kV double-cireuit transmission line on the same tower,and develops the calculation software on MATLAB. By comparing the degree of balance in all kinds of phase sequences, the paper proposes same phase sequence and negative phase sequence arrangement according to the electric field intensity on the earth＇s surface

关 键 词：不平衡电流 同塔双回线路 相序排列 

分 类 号：TM723[电气工程—电力系统及自动化]