Published Paper Details:

A study on a comparison of two systems based on different methods for calibration of current transformers at a number of different transformation ratio and power frequencies of 60 Hz and 50 Hz at the National Research Council (NRC) is described. The obtained discrepancies in ratio and phase errors are within a few ?A/A for small test currents and less for larger test currents. Current transformers are precision devices that scale high currents down to a value that can be easily handled by measurement equipment. To support CT application in revenue metering. A calibration service at the National Institute of Standards and Technology (NIST) for laboratory-quality current transformers is described. A service provides measurements of the current ratio and the phase angle between the secondary and primary currents. Electric energy at current found in utility distribution systems relies on components watthour meter, voltage transformer, and current transformer 50 Hz and 60 Hz transformer can be calibrated at NIST for a range of the primary to secondary current ratios from 0.25A:5A to 12000A:5A.