Abstract
The article describes the method of calculating the power autotransformers specific losses taking into account the tank profile and under the influence of the DC current flowing through its grounded windings. The mathematical model that adequately describes the complex profile of the tank of a power single-phase autotransformer of high power over 100 MVA was developed. The tangential components of the leakage magnetic field on the tank surfaces and the additional losses of active power from eddy currents in the tank walls were determined at saturation of the magnetic system of the autotransformer with a direct current that flew through its grounded windings. The set of the most heated points of the autotransformer tank was found. The dependence of the maximum values of the temperature change rate in the most heated points on the tank surface of the autotransformer 267 MVA 500/220 kV from the direct current value were established.
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