A Comparison of Two Current Transformer Calibration Systems at NRC Canada

A comparison of two systems based on different methods for calibration of current transformers at several different transformation ratios, burdens, and power frequencies of 60 Hz and 50 Hz is performed at the National Research Council of Canada. The obtained discrepancies in ratio and phase errors are within $5~\mu \text{A}$ /A and $\mu $ rad, respectively, for small test currents and less for larger test currents.