METHOD AND SYSTEM FOR OPERATING A CONTROL TRANSFORMER

A method for operating a control transformer (10) for coupling two electrical energy networks (2, 3), with a system (1) comprising - a control transformer (10) having at least one first control winding (12) on a high-voltage side (13) and having at least one second control winding (14) on a low-voltage side (15), - a first on-load tap changer (16) for switching between at least two winding taps (N1,...NJ,..., NN) of the first control winding (12), - a second on-load tap changer (17) for switching between at least two winding taps (N1,...NJ,..., NN) of the second control winding (14), - an outgoing line (18) connected to the low-voltage side (15), the method comprising the following steps: - detecting a first signal (S1) indicating an imminent transition from a first operating state to a second operating state on the low-voltage side (15) of the control transformer (10), - actuating the second on-load tap changer (17) in such a way that the second on-load tap changer (17) is switched from a first operating position to a second operating position, in which the voltage present on the outgoing line (18) assumes a minimum value close to zero.