500kV主变单相更换后35kV侧电压不平衡分析  

Analysis of Voltage Imbalance at 35kV Side after 500kV Main Transformer Single-Shase Replacement

作　　者：蔡潞 CAI Lu(Guiyang Bureau of Extra High Voltage Power Transmission Company,China Southern Power Grid Co.,Ltd.,Guiyang 550000,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司贵阳局,贵州贵阳550000

出　　处：《变压器》2023年第2期59-63,共5页Transformer

摘　　要：本文中作者针对某500kV变压器单相更换后出现35kV侧三相电压不平衡,导致主变保护装置低压侧及35kV母差保护零序电压告警问题,通过PSCAD进行仿真分析,讨论了三相电压不平衡对设备和保护装置可靠性的影响,通过现场实测数据验证了仿真结果的准确性,给出了合理的解决方案。In this paper,the author analyzes the three-phase voltage imbalance on the 35kV side after the single-phase replacement of a 500kV transformer,which causes the low-voltage side of the main transformer protection device and the zero-sequence voltage alarm of the 35kV bus differential protection.To balance the influence on the reliability of equipment and protection devices,the accuracy of the simulation results is verified by on-site measured data,and a reasonable solution is given.

关 键 词：变压器 电压不平衡 仿真 中性点偏移 

分 类 号：TM406[电气工程—电器]