A novel generation and measurement setup for the characterization of MV Voltage Transformers from 9 kHz up to 150 kHz

This paper proposes a generation and measurement setup for the characterization of Voltage Transformers (VTs, both inductive as well as Low Power Voltage Transformers, LPVTs) at power frequency and from 9 kHz to 150 kHz with waveforms having amplitudes at MV level. It involves the independent generation of the fundamental tone and of the high-frequency components to produce the desired distorted test waveform. The generation of the fundamental frequency component, in MV amplitude range, is obtained by means of a step-up VT, whereas the high frequency components are generated through a series connected voltage amplifier. As regards the measuring stage, the fundamental tone is measured through a commercial divider. Instead, high frequency tones are measured through a reference device, operating in the range [9, 150] kHz, specifically designed, realized and characterized. As an application, the characterization of two commercial VTs, an inductive VT and a LPVT, are presented.