【摘要】 为实现更加坚强的电网目标,对变压器绕组变形进行在线监测显得越发重要。介绍了应用电流偏差系数法在线监测变压器绕组变形的基本原理,并在Simulink仿真平台进行仿真。经套管末屏向绕组中注入频率为600 kHz~1.2 MHz之间某一单一频率正弦信号,并测量绕组首端和中性点接地线上的高频电流,通过计算绕组首末两端电流的变化及电流偏差系数以确定绕组变形的程度、类型和位置。通过仿真,该方法不仅能够判断绕组是否发生变形,而且能够判断绕组变形的类型、程度和位置。该方法用于变压器绕组变形在线监测简单、有效。更多还原

【Abstract】 To achieve a stronger power grid,online monitoring of the transformer winding deformation becomes more important.The basic principles of transformer winding deformation online monitoring based on the current deviation coefficient method is introduced in this paper,followed by a simulation on Simulink platform.The single frequency sinusoidal signal at the range of 600 kHz~1.2 MHz is injected to the winding through the bushing tab to measure the high frequency currents at the line-end and neutral-end of the transformer winding,calculate the current variation and the current deviation coefficient of the line-end and neutral-end of the transformer winding,and determine the extent,type and location of the winding deformation.The simulation shows that the method can judge whether the winding deformation has happened,and determine the type,extent and location of winding deformation.The method is simple and applicable for online monitoring of the winding deformation.更多还原