FIELD: electrical engineering.
SUBSTANCE: invention relates to a transformer winding stages switch with semiconductor switching elements for continuous switching between the two branches (branch n, branch n+1) of winding of a transformer with staged voltage control each winding branch is connected to the common load output via the corresponding mechanical switch (DS) and a series circuit of two oppositely placed IGBTs (IP, In), the circuit linked in series to the mechanical switch. According to the invention, each IGBT is shunted with a corresponding varistor (Vp, Vn), connected in parallel thereto and calculated in a special way.
EFFECT: no need for special setting to corresponding rated current.
3 cl, 2 dwg
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