Calibration of a precision current measurement system for high AC voltages using an AC Quantum Voltmeter

This paper describes the experimental application of the AC Quantum Voltmeter for the calibration of a high precision measurement system for high AC voltages, both developed at PTB. Measurements are based on its use as DC quantum standard for resistance comparisons, and as AC quantum standard for AC current measurement, in a time series.

I. Introduction

At PTB a precision measurement system for high AC voltages (PS-HVAC) was developed and presented in [1]–[3]. This system is intended to be used as the national standard for high AC voltages up to 800 kV with an overall uncertainty of . It is based on the measurement of a 50 Hz loading current of a high voltage capacitor, and the analogue conversion of this current to a reference voltage. Traceable 50 Hz currents from 0.15 mA to 50 mA are required for calibrating the instrument on its 7 measuring ranges.