500kV变压器空投涌流分析及保护误动预控措施

摘要

涌流可能引起运行变压器或发电机的差动保护误动,影响变压器和发电机的安稳运行.从生产实际工作出发,构建电力系统物理模型,较为详细地分析了500 kV变压器空投过程中,产生励磁涌流及和应涌流的原因、特点和由此带来的实际问题.最后,提出了多种目前现场可以采取的防范措施.%Inrush may cause the mal-operation of differential protection for transformer or generator, and affects their normal running. Starting from the actual production work, the paper will establish a physical model of power system and introduce a more detailed analysis of the reason, characteristics and the resulting practical problems of the magnetizing inrush and the inrush current generated during a 500 kV transformer no-load switching process. Finally, this paper put forth a variety of preventive on site measures.