Compact high-voltage transformers or high-voltage transformers or HV transformers are finding their way into more and more areas of industry. As a high-voltage transformer with 50 Hz, as a high-voltage converter up to 150 kHz or as a high-voltage pulse transformer for pulse powers up to 15 MW. With the help of high voltage, they enable, for example, imaging processes in medical technology (e.g. computer tomography), the prevention of collisions on ships through radar scanning, the filtering of contaminated air in industrial halls or the plasma activation of plastic surfaces that would otherwise not be printable.