Development of a precise broadband high-voltage divider

A broadband high-voltage divider up to 18 kV (rms) is being developed for the EU Joint Undertaking “PowerizeD”. The frequency range extends from DC to 150 kHz. The measurement uncertainty of the amplitude should be less than 500 ppm at 50 Hz and less than 3000 ppm at 150 kHz. Likewise, the phase delay should be smaller than 1µs.

In order to test these requirements, the the company ZES ZIMMER, in cooperation with IAP Frankfurt and the Physikalisch Technische Bundesanstalt (PTB) in Braunschweig, has set up a measuring station for measuring the high-voltage divider up to 1 kV (rms) from DC to 150 kHz with the lowest possible measurement uncertainty. The central element here is a power measuring device LMG 641, which is used as a transfer standard for both DC and AC. This transfer standard was characterized by PTB Braunschweig from DC to 100 kHz. Due to the detailed knowledge of the LMG641, it is also possible to study frequencies above 100 kHz with low measurement uncertainty. This means that the measuring system achieves very low inaccuracies across the entire frequency band.

The measuring system was developed in parallel to the high-voltage divider. Its low uncertainty allows even small phenomena to be studied and compared with simulation results.