Research of transformer winding deformation based on Finite Element Method

Short-circuit impedance (SCI) method have been widely used for winding deformation detection. However, the short-circuit impedance method at present still lack the adequate theoretical analysis mechanism to determine the deformation extent, also unable to quantify the deformation accurately. To improve the judging mechanism, analysis of the relationship between leakage reactance variation and winding deformation is essential. In this digest, the leakage reactance of a simplified transformer is calculated by theoretical derivation first. Then, a proportional model is established based on Finite Element Method (FEM), and simulations of a variety of complex deformation are conducted. The accuracy of the method is verified by the corresponding test results, which offers helpful guidance for short-circuit impedance method.