考虑相频曲线的频响法检测变压器绕组轴心偏移的研究

Research on Frequency Response Method Considering Phase Frequency Curve to Detect Transformer Winding Axis Offset

轴心偏移是变压器绕组形变故障之一。为了更好地检测故障以提高变压器运行安全性,在常用频率响应法比较故障前后幅频特性曲线的基础上,附加考虑相位特征,并结合有限元法建立变压器绕组三维模型,绘制变压器幅频与相频特性曲线。对比幅频曲线的变化,轴心偏移故障发生前后相频特性曲线的变化在高频区域更具规律性。因此,引入相位特征能为频响法检测变压器绕组形变故障提供新的思路。

Axis offset is one of the deformation faults of transformer winding.In order to better detect the fault and improve the safety of transformer operation,based on the common frequency response method to compare the amplitude frequency characteristic before and after the fault curve,the phase characteristics were additionally considered,and the three-dimensional model of the transformer winding was established in combination with the finite element method,and the transformer amplitude-frequency and phase frequency characteristic curve were drawn.Compared with the variation of amplitude-frequency characteristic curve,the variation of phase frequency curve before and after axis offset fault is more regular in the high frequency region.Therefore,the introduction of phase characteristics can provide a new idea for frequency response method to detect transformer winding deformation fault.