High Voltage Measurements by sampling technique

Laboratoire National de Metrologie et d’Essais, 29 avenue Roger Hennequin 78197 Trappes, France

^a Email de correspondance de l’auteur : auteur@email.org

Abstract

A new method, based on the sampling technique, has been developed in LNE for the calibration of high voltage dividers and high voltage transformers for frequencies from 15 Hz to 1000 Hz. The divider under calibration is compared to a high voltage standard; the output voltages are sampled by two sampling voltmeters; the ratio and the phase shift of the divider under calibration are calculated with a Discrete Fourier Transformer algorithm. This method is characterized for voltage up to 300 kV at 50 Hz-60 Hz frequency range, for voltage up to 100 kV at 60 Hz-1000 Hz frequency range and for voltage up to 30 kV at 15 Hz-50 Hz frequency range. The uncertainties are less than 0,002 % for the ratio and less than 20 μrad for phase shift at 50 Hz-60 Hz frequency range. At other frequencies they are less than 0,005 % for the ratio and less than 50 μrad for the phase shift.