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In this paper, modelling and measurement of resonant overvoltages in wind turbine step-up transformers is presented. A failed 2.7 MVA, 0.690 / 33 kV step-up transformer with the MV side consisting of delta connected layer windings and the LV side consisting of star connected foil windings is presented as a case study. The failed transformer showed substantial damage in the first and second layer of...
Frequency characteristics measurement at the power transformers became a requirement imposed to the manufacturers in the specifications of the new products. There is a great interest dealing with the frequency characteristics from the viewpoint of the resonances that may appear between the transformer and the network where it is placed, as well as to detect the mechanical failures that may appear...
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