Device and method for reducing a magnetic unidirectional flux component in the core of a three-phase transformer

A method for operating a device for reducing a magnetic unidirectional flux component in a core of a three-phase transformer comprising at least one compensation winding magnetically coupled to the core of the three-phase transformer, a switch arranged electrically in a current path in series with the at least one compensation winding to feed a current into the at least one compensation winding, an effect of said current being directed oppositely to a unidirectional flow component, and a current limiter, said current limiter being arranged electrically in a current path in series with the at least one compensation winding, the method comprising:

• triggering, by a phase detector, a control unit comprising a timing element;
• detecting, by the timing element, a phase of voltage induced in the at least one compensation winding;
• and
• controlling the switch, by the control unit, such that a pulsating direct current is fed into the at least one compensation winding:,
• wherein the device comprises two compensation windings provided on respective different legs of the core of the three-phase transformer;
• wherein the two compensation windings are connected in series to each other;
• wherein an input of a primary and an output of the secondary compensation winding are each connected to an input of one of two windings of a single-phase transformer;
• and
• wherein outputs of the two windings of the single-phase transformer are short-circuited and connected via the switch to a connection between an output of the primary compensation winding and an input of the secondary compensation winding.