同塔多回输电线路三相电流不平衡的机理及解决方法  

Mechanism of Unbalance of Three-phase Current of Multiple Circuit Transmission Lines on the Same Tower and Solution

作　　者：赵艳军 陈晓科 陈迅 杨汾艳 

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080

出　　处：《广东电力》2015年第6期75-81,共7页Guangdong Electric Power

基　　金：广东电网有限责任公司科技项目(K-GD2011-433)

摘　　要：采用叠加电磁感应电势矢量分解法,从环流电势和穿越电势的角度剖析同塔多回线路三相电流不平衡的机理,指出强不对称叠加感应电势和低阻回路是导致三相电流不平衡的根本原因。以广东电网220 kV祥铁甲、乙线为案例进行仿真验证,结果表明优化同塔多回线路相序排列方式和改变流通路径可减小线路不平衡电流,且前者较为经济、可行。From points of circulating current and through potential,vector decomposition method for superimposed electro-magnetic induced potential was applied for analyzing mechanism of unbalanced three-phase current of multiple circuit trans-mission lines on the same tower,and it was pointed out the basic reason for causing unbalance three-phase current was asym-metric superimposed induced potential and low resistance circuit. A line and B line of 220 kV Xiangtie transmission line of Guangdong power grid was taken for example for simulating verification. The results indicate that it is able to reduce unbal-anced current of small lines by optimizing phase arrangement of the multiple circuit transmission lines on the same tower and changing circulation path and the former way is more economic and reliable.

关 键 词：同塔多回输电线路 三相电流不平衡 不对称电磁感应电势 低阻回路 穿越电流 环流 相序排列 

分 类 号：TM726.3[电气工程—电力系统及自动化]