Power and energy measurements in smart grids require a measurement system capable of performing signal processing at the
higher harmonic frequencies that are present in power grids. For the calibration process of instrumen t voltage transformers, or
high-voltage dividers, it is necessary to have a high-voltage source with an appropriate frequency range. The fundamental element
of such a source is the output high-voltage transformer operating at a nominal voltage of 10 kV and in the frequency range from
200 Hz up to 10 kHz. The output current is assumed to be lower than 20 mA. This paper focuses on the design and realization of the
magnetic circuit of the transformer described above. Trafoperm, ferrite or nanocrystallin e materials can be used for the frequency
range considered here. Ferrite materials usually reach saturation at a magnetic ux density of 0.2 T with very low permeability
values, while trafoperm material usually suffers from unacceptable power losses in higher frequency areas. This is the main reason
why these materials are not suitable for use in a wide range of frequencies, and some combined magnetic cores must be used.
The prop osed solution is based on magnetic cut C type cores made from nanocrystalline alloy (VITROPERM 500), which behaves
better in the frequency range under consideration. The magnetic parameters of this material were measured and compared with
trafoperm, and th en , the 10 kV high-voltage tran sformer was designed and manufactured.