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变压器绕组变形在线监测实验研究

, PP. 184-190

Keywords: 绕组变形,高频电流传感器,电流偏差系数,电力变压器,在线监测

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Abstract:

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600kHz~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。

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