基于Matlab的变压器绕组变形频率响应的仿真研究

Simulation research on frequency response of transformer winding deformation base on Matlab

频率响应法(FRA)是检测电力变压器绕组变形的一种可靠方式,本文以三绕组变压器为研究对象,提出考虑各个单元之间互感和绕组相邻线饼间电容的模型。首先,采用有限元软件Maxwell建模求取正常及变形绕组的等效电路参数;其次,根据仿真得到的等效电路参数,在Matlab中建立状态空间模型,通过参数矩阵进行频率响应计算,得出高压绕组轴心偏移和饼间间距变化两种典型绕组变形对频率响应曲线的影响规律。研究结果对后续提取反映频率响应特性的特征向量,实现变压器绕组变形类别的识别具有一定参考价值。

Frequency response analysis(FRA) is one of the main methods to detect the winding deformation of power transformer.This paper takes the three-winding transformer as the research object and proposes a model that considers the mutual inductance between each unit and the capacitance between the adjacent windings.Firstly,the equivalent circuit parameters of normal and deformed windings are calculated through the simulation of finite element software Ansys Maxwell.Secondly,according to the equivalent circuit obtained by the simulation,the state space model is established in Matlab.The frequency response is calculated through the parameter matrix,and the influence of two typical winding deformation types of the axis deviation of the high voltage winding and the change of the gap between the disks offset is obtained.The research results have a certain reference value for extracting the feature vector reflecting the frequency response characteristics and realizing the identification of transformer winding deformation type.