Improvements in the Performance of a Calibration System for Rogowski Coils at High Pulsed Currents

This paper describes improvements of a calibration system for Rogowski coils at high pulsed currents developed at the National Research Council of Canada. This system is designed to provide traceable calibrations of Rogowski coils and weld current meters for users in resistance welding industry, secondary laboratories, and other organizations. The accuracy of the improved calibration system is related to the improved measurement of harmonic content of the test pulsed currents and is estimated for individual tests.