750 k V双回平行线路电流不平衡异常情况分析和处理  

Analysis and Treatment of Current Unbalance Abnormal Situation of 750 kV Double-Circuit Parallel Transmission Line

作　　者：李山 颉雅迪 王晓彤 LI Shan;XIE Ya-di;WANG Xiao-tong(State Grid Xinjiang Electric Power Research Institute,Urumqi 830011,China;China Electric Power Research Institute Co.,Ltd,Beijing 100192,China)

机构地区：[1]国网新疆电力有限公司科学研究院,新疆乌鲁木齐830011 [2]中国电力科学研究院有限公司,北京100192

出　　处：《电工电气》2022年第2期23-27,共5页Electrotechnics Electric

摘　　要：当前短距离双回平行线路不换位会引起三相参数不对称,进而导致三相电流不对称。以某实际运行的750kV双回平行架设线路为例,利用EMTPE电磁暂态仿真软件对电流不平衡现象进行仿真分析,研究相序排列、回路间距离、导线间距离、线路长度、等值阻抗、地线情况和线路潮流等因素对电流不平衡的影响,并提出合理的抑制措施。仿真结果表明:线路潮流较重、双回线路采用同相序排列且回路间距离较近时,线路上会出现幅值较大的零序电流,主要以环流为主,若不宜采用调整保护对策时,可考虑调整双回线路为逆相序排列运行方式。If the phase position of the current short-distance double-circuit parallel lines does not change,the three-phase current will be unsymmetrical.This paper took the 750kV double-circuit parallel erected line as an example.Simulating and analyzing the phenomenon of current imbalance with EMTPE electromagnetic transient simulation software.It studied factors that might impact the current balance,such as phase sequence arrangement,circuit spacing,conductor spacing,circuit length,equivalent impedance,earth wire condition,line power flow,etc.Based on the results,this research provided corresponding suppression methods.The simulation results show that when the line power flow is heavy,the double-circuit lines are arranged in the same phase sequence and the distance between circuits is relatively short,the large amplitude of zero sequence current will emerge,especially circulation.Under the situation that is not suitable to adopt the adjustment protection countermeasures,adjusting the double-circuit line to reverse phase sequence operation mode could be an alternative.

关 键 词：电流不平衡 双回平行线路 序分量 影响因素 EMTPE电磁暂态仿真软件 

分 类 号：TM726.3[电气工程—电力系统及自动化]