Nested multigrid finite element analyses of eddy current losses in power transformers

The distribution of eddy currents in the core clamping parts and the tank wall of power transformers is obviously different between measurements of load losses and normal operational conditions. Thus, the calculation of these losses shows the regions of possible hot-spot temperatures with normal operational conditions. The presented analysis method uses 3D nonlinear time-harmonic finite element analyses with a nested multigrid solver. Consequently, the occurring short calculation times allow to take into account for ambitious technical specifications and individual customer demands.