Characterizing Voltage Transformers up to 150 kHz: A New Approach to Generate MV Distorted Test Waveforms

The increase in disturbances at frequencies higher than 10 kHz in Medium Voltage (MV) grids has led to new needs related to the characterization of Instrument Transformers (ITs) involved in the monitoring of these disturbances. In this context, this paper presents a novel generation and measurement setup for the characterization of MV Voltage Transformers (VTs) up to 150 kHz. The proposed approach is based on the generation of test signals composed of a tone at MV and power frequency and one at reduced amplitude and higher frequency. By implementing a suitable compensation technique, the traceability of the two tones is ensured before their combination.