变压器绕组变形在线监测实验研究

发布时间：2018-06-21 23:14

本文选题：绕组变形 + 高频电流传感器　；参考：《电工技术学报》2014年11期

【摘要】：变压器是电力系统最重要的设备之一,绕组故障是导致变压器故障的一个重要方面。本文采用了一种简单且有效的方法探讨了在线监测变压器绕组变形。在绕组首端通过套管注入一个频率在600k Hz~1.2MHz之间的正弦信号,通过研制的高频电流传感器同时测量绕组首端和末端的高频电流信号,利用模拟滤波及数字滤波技术得到所施加的高频正弦信号,计算电流偏移量以确定绕组变形的程度,计算电流偏差系数以确定绕组变形的类型及位置。自制的高频电流传感器具有频带宽、线性度好及灵敏度高的优点。实验结果表明该方法能够实现变压器绕组变形的在线监测,并能够判别绕组变形的程度、类型,且电流偏差系数与绕组变形的位置有关,该方法灵敏度高,重复性好,抗干扰性强。
[Abstract]:Transformer is one of the most important equipments in power system. Winding fault is an important aspect of transformer fault. A simple and effective method for on-line monitoring transformer winding deformation is presented in this paper. A sinusoidal signal with a frequency of 600kHz 1.2MHz is injected through the casing at the first end of the winding. The high frequency current signals at the first and end ends of the winding are simultaneously measured by the developed high frequency current sensor. The high frequency sinusoidal signal is obtained by analog filtering and digital filtering. The current offset is calculated to determine the degree of winding deformation and the current deviation coefficient is calculated to determine the type and position of winding deformation. The self-made high-frequency current sensor has the advantages of high frequency bandwidth, good linearity and high sensitivity. The experimental results show that the method can realize on-line monitoring of transformer winding deformation, and can distinguish the degree and type of winding deformation, and the coefficient of current deviation is related to the position of winding deformation. The method has high sensitivity and good repeatability. Strong anti-interference.
【作者单位】：上海交通大学电子信息与电气工程学院;
【分类号】：TM406

【参考文献】