Method and device for changing a transformation ratio, an impedance, or a voltage used for excitation

A method for changing a transformation ratio, an impedance, or a voltage, used for excitation, of an item of electrical equipment, the item of electrical equipment comprising:

• at least one tap winding comprising winding taps, and at least one partial winding;
• and
• a tap changer configured to change the transformation ratio, the impedance, or the voltage, used for excitation, of the item of electrical equipment,
• wherein:
• the tap changer comprises a first module configured to connect the winding taps of the tap winding to one another;
• and a second module comprising semiconductor switching elements configured for the switching-in, switching-out or bypassing of the at least one partial winding,
• the method comprising:
• receiving a request to change the transformation ratio, the impedance, or the voltage, used for excitation, of the item of electrical equipment;
• checking at least one relevant parameter;
• and
• changing the transformation ratio, the impedance, or the voltage, used for excitation, of the item of electrical equipment either by way of the first module or by way of the second module depending on the check of the at least one relevant parameter.