A modified technique for the calibration of a current-comparator-based high voltage capacitance bridge and its comparison between KRISS and NRC

A modified technique for calibrating both the capacitance ratio and dissipation factor (DF) dials of a current-comparator-based high voltage capacitance bridge (CCB-HVCB) has been developed at KRISS. The capacitance ratio and DF dials are calibrated, respectively, in the ratio range from 1/1 to 100/1 and in DF range from 10 × 10^-6 to 1 × 10^-1. From the calculated and measured values of the corresponding dial balanced readings, the errors in the capacitance ratio an DF dial readings can be derived. This modified calibration technique has been implemented on a commercial version of a NRC developed CCB-HVCB. The comparison results of the calibration performed at KRISS and NRC will be presented and discussed.