Abstract
Main text The purpose of conducting comparison COOMET.EM-S22 of reference measuring systems of the AC current ratio of national metrological institutes (NMIs) is to determine the degree of consistency of national standards among themselves in the participating countries. Six NMIs participated in the supplementary comparison COOMET.EM-S22. Affiliated Branch of D I Mendeleev Institute for Metrology (VNIIM-UNIIM), Russian Federation, acted as the coordinating laboratory of the comparison. The comparisons were carried out by comparing the measurement results of the characteristics of measuring current transformers (CTs), namely, the units of the coefficient and the angle of the scale conversion of the sinusoidal current at a frequency of 50 Hz. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).