1 kV Wideband Voltage Transducer, a Novel Method for Calibration and a Voltage Measurement Chain

A new reference resistive-capacitive voltage divider is presented in this paper, operating in DC and AC from 10 kHz up to 200 kHz. The ratio error is lower than 0.1% and the phase error is lower than 400 urad (1.375’) at 100 kHz. The divider is stable and repeatable. The scale factor and the phase error repeatability, tested in 24 hours continuous measurements repeated during 15 weeks, show a scale factor variation lower than 80 ppm and a phase error variation lower than 20 urad. This allows one to define a calibration matrix of the device bringing its relative measurement uncertainty lower than 0.5∙10^-3 . The divider calibration has been obtained with a step-up method, which could improve traceability in many laboratories, and is described in the paper. The divider can be embedded in a calibration chain to test the accuracy of voltage transducers in the measurement of the AC voltage ripple, in the presence of a significant DC component, as it occurs in many power electronic systems. The voltage calibration chain is based on the use of the reference divider and a voltage injector, the secondary of which is placed in series with a stable DC source. By means of this calibration system, one of the best commercial voltage transducers on the market has been analyzed. The work also highlights how the proposed voltage calibration chain could be used in perspective in a phantom power system for the development of a DC plus AC power standard.