基于电压突变量的变压器励磁涌流识别的探究

摘要

差动保护是电力变压器的主保护，但变压器空载合闸时出现的励磁涌流易造成差动保护误动作，如果能准确鉴别励磁涌流和故障电流，就能提高保护动作的可靠性。本文在二次谐波制动原理的基础上，提出了一种基于电压突变量的励磁涌流辅助判据，并利用 MATLAB 软件对励磁涌流进行仿真。%Differential protection is Lord of the power transformer protection,but there was a excitation inrush current of transformer no-load closing easy to cause the differential protection misoperation,if can accurately identify excitation inrush current and fault current,it can improve the reliability of protection action.Based on second harmonic braking principle,is proposed based on a voltage mutation of excitation inrush current auxiliary criterion,and excitation inrush current to make use of MATLAB software simulation.