Abstract
In this paper, an algorithm for calculating the asymmetric current distribution in parallel-connected high-voltage winding sections of a transformer during a short-circuit test caused by an asymmetric magnetic field is described. This calculation is essential in multi-winding transformers, such as traction transformers and rectifier transformers, which have a high-voltage winding consisting of sections connected in parallel, where the number of sections is equal to the number of low-voltage windings and only one low-voltage winding is shorted during the short-circuit test.An optimization method, combined with a semi-analytical transformer model based on conformal mapping, is used to calculate the magnetic field and find a combination of currents in parallel-connected sections assuming equal induced voltages, i.e. flux linkages, in each section.The results of the calculation show good agreement with measurements carried out on the traction transformer for an electric multiple unit.
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