The high frequency resonant behavior of a winding disc is studied by measurements on a test setup, and by computer simulation of lumped-element circuit models. It is shown that in order to achieve satisfactory agreement between both, every turn must be described by several segments in the model. The reason is that the high frequency end of the spectrum is dominated by “azimuthal” resonance modes which are not present in models with lower resolution. The intermediate frequency range is characterized by “radial” resonances, present even in lower resolution models. The different physical character and properties of these modes are discussed. Our findings provide new insight into the interpretation of frequency response measurements on power transformers.