基于熵权关联理论的变压器绕组松动状态的振动检测法

摘要

为更加准确地检测变压器绕组的故障隐患，从变压器绕组多个测点处振动频响曲线的相关性出发，提出了一种综合灰色关联分析和熵权理论的变压器绕组振动检测方法。首先基于灰色理论计算了各个测点处振动频响曲线的灰色关联度和灰色面积关联度，然后定义了熵权关联度对变压器绕组状态进行检测。对某220 kV变压器绕组正常与松动时的振动频响试验结果进行了分析，结果表明，所定义的熵权关联度的计算结果与变压器预设工况吻合良好，可以较好地描述变压器绕组的松动状态，具有较好的工程应用价值。%To effectively detect the hidden fault of transformer winding,a new vibration detection method of transformer winding is proposed,which combines grey correlation analysis and entropy weight theory,and is based on the inherent relations of vibration fre-quency response (VFR)curves at several measuring points.The grey correlation degree and grey area correlation degree of VFR curves at each measuring point are computed based on grey theory,then entropy weight correlation degree is defined and the state of transformer winding is tested.The VFR experimental results of some 220 kV transformer winding under normal and lossened condition are analyzed.The results show that the computed results based on proposed method agree well with the preset condition of transformer winding,which well illustrates the loosened degree of transformer winding,and has better application value.