基于磁—结构直接耦合动态分析变压器绕组变形的研究

Dynamic deformation analysis of transformer windings based on magnetics-structure direct coupled-field

在短路电流作用下,变压器绕组会承受连续变化的巨大电磁力冲击,过程中可能影响变压器稳定运行,甚至遭受严重破坏。针对传统方法难以分析考虑和结构场相互影响下绕组变形动态过程的现状,提出磁—结构直接耦合方法,将其引入到对变压器绕组变形动态过程的研究。以一台220 kV典型变压器为例,首先通过ANSYS磁—结构直接耦合方法,分析了变压器的磁场和结构场耦合特性。然后,针对系统故障实例,分析了变压器绕组变形的动态过程。最后,进一步针对故障实例中电流最大时刻,对比静态场分析结果,分析结论一致,验证了方法的正确性。该研究为动态分析变压器绕组变形过程提供了一种有效的研究方法。

When transformer windings withstand the shock of continuous change of tremendous electromagnetic force under the impact of short circuit current, transformer may not stably operate and even suffer serious damage. In the light of present situation that the traditional method is difficult to analyze the dynamic process of winding deformation under the mutual influence of magnetic field and structure field, a method of magnetics-structure direct coupled-field method is presented, which is introduced to the dynamic analysis of the process of the transformer winding deformation. Firstly, the magnetic field and structure field coupling characteristics of the transformer are analyzed by ANSYS magnetics-structure direct coupled-field method for a typical 220 kV transformer. Then, in view of the short circuit fault example, the dynamic deformation process of the transformer windings is studied. Finally, in the case of the maximum current moment in the fault example, compared with the static field analysis results, the analysis results are consistent, and the correctness of the method is verified. This method may provide an effective research approach for dynamic analysis of transformer winding deformation process.