220kV同塔双回输电线路架空地线感应电流与电能损耗  

Overhead Ground Wires Induction Current and Energy Loss of 220 kV Double Circuit Transmission Lines

作　　者：王宇[1] 王建国[1] 彭向阳[2] 徐晓刚[2] 毛先胤[2] 李显强[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广东电网公司电力科学研究院,广州510000

出　　处：《高压电器》2013年第5期31-38,共8页High Voltage Apparatus

基　　金：广东省电网公司科技项目(K-GD2011-432)~~

摘　　要：同塔双回输电线路架空地线逐基接地时,架空地线的感应电流和电能损耗是值得关注的问题,目前关于架空地线损耗的定量研究较少。通过对广东某220 kV同塔双回输电线路架空地线感应电流进行了现场实测,使用ATP-EMTP程序对该线路感应电流进行仿真计算,实测值与计算值吻合较好。计算讨论了同塔双回架空线路导线相序排列方式、线路电流大小和线路电流不平衡度对架空地线感应电流和电能损耗的影响。结果表明,架空地线感应电流和线路电流变化呈线性关系,地线电能损耗与线路电流增大呈平方关系,同塔双回输电线路导线逆相序排列时架空地线感应电流和电能损耗相对最小。线路电流不平衡度越大,架空地线感应电流和电能损耗越大,控制电流不平衡度有利于降低架空地线损耗。In the case that overhead ground wires of double circuit transmission lines are grounded at each tower,the induction current and energy loss in overhead ground is a problem which is of less quantitative researches currently. The overhead ground wire induction current of a 220 kV double circuit transmission line at Guangdong is measured in the field, and simulation calculation is carried out using ATP-EMTP,where measured results of are well accord with the calculated values. The effect of factors such as phase sequence arrangement, line current and line current unbalanced degree on ground wire induction current and energy loss are also discussed. The results show that induction current and power loss is the minimum value in reverse phase sequence arrangement of double circuit transmission lines. It appears a linear relationship between the overhead ground wire induction current and line current,while energy loss of the overhead ground wires increases in square form with the circuit current increasing. As line current unbalanced degree increases,the overhead ground wire induction current and energy loss increase ,which requires strictly limit to the current unbalanced degree.

关 键 词：同塔双回输电线路 感应电流 地线损耗 导线相序排列 电流不平衡 ATP-EMTP 

分 类 号：TM751[电气工程—电力系统及自动化]