基于有限元模型的变压器绕组松动研究

Research on Transformer Winding Looseness Using Based on Finite Element Model

为了研究预紧力大小与变压器绕组松动的关系,通过有限元分析了不同预紧力对变压器振动信号的影响。绘制变压器模型并导入有限元分析软件ANSYS Workbench进行模态分析和谐响应分析,得到了变压器固有频率随着预紧力降低而减小的结果,而施加激励力后,预紧力的变化对振动信号也有较大的影响,其变化趋势由不同位置处的结构决定。因此可以通过计算变压器在不同预紧力时的振动响应特性,并与历史数据比较,从而判断绕组是否发生松动。

In order to investigate the relationship between pre-compression and transformer winding looseness, the influence of different pre-compressions on transformer windings is analyzed using finite element method. The model of transformer is built in ANSYS Workbench so that modal analysis and harmonic response analysis can be carried out. The analysis results show that natural frequency decreases with pre-compression reduces. With excitation force, pre-compression change has great effects on vibration signal, and changing tendency is decided by structure. Therefore, through comparing the vibration response characteristics of transformer under different pre-compression to historical data, winding looseness can be identified.