The establishment of power/energy standard at China Electric Power Research Institute and its comparison with NRC

This paper describes the establishment of a single-phase power/energy standard at CEPRI. It is based on a computer-controlled commercial version of a NRC developed current-comparator-based power/energy bridge. The bridge allows the calibration of single-phase active/reactive power and energy meters at voltages up to 600 V, currents up to 100 A, any power factor from zero lag through unity to zero lead, and test frequencies of 45 Hz to 65 Hz. It has an estimated uncertainty (k=2) of less than 25 μW/VA. A comparison of power/energy meter calibration systems between China Electric Power Research Institute and the National Research Council of Canada will also be presented and discussed.