A method for calibration of partial discharge calibrators has been developed based on passive integration of the induced charge. The voltage over a known capacitor is measured by a calibrated digital sampling voltmeter and the charge is calculated as the voltage multiplied by the capacitance. The best achieved uncertainty is /spl plusmn/2% with a coverage factor k=2.
['Ove Gunnarsson', 'Anders Bergman', 'Karl-Erik Rydler']
A method for calibration of partial discharge calibrators