KRISS-NRC intercomparisons of calibration systems for instrument transformers with many different ratios at power frequency

An intercomparison of calibration systems for instrument transformers between Korea Research Institute of Standards and Science (KRISS) and National Research Council of Canada (NRC) with many different ratios at 60 Hz was performed using six portable transfer standards consisting of two current transformers (CTs) with current ratios of 5 A/5 A up to 20,000 A/5 A and four voltage transformers (VTs) with voltage ratios of 110 V/110 V up to 66,000 V/110 V. The comparison results for the instrument transformers calibration systems between the two institutes are in good agreement within the corresponding expanded uncertainties for all current and voltage ratios.