Abstract
A mathematical model has been developed that adequately describes the complex profi le of a high-power single-phase autotransformer tank over 100 MVA. The tangential components of the magnetic fi eld of dispersion on the surfaces of the tank and additional losses of active power from eddy currents in the walls of the tank are determined when the magnetic system of the autotransformer is saturated with direct current fl owing through grounded windings. Many of the hott est points of the tank autotransformer are found. The dependence of the maximum values of the rate of change in the temperature of the most heated points on the surface of the tank of the autotransformer AODTSTN-267000/500/220 on the magnitude of the direct current was established.
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