Automatic non-linear phase response calibration and compensation for a power measurement device

摘要

Phase delay compensation sweep may be used in determining correct phase delay compensation of measured currents for substantially matching a measured apparent power to an expected apparent power over an operating range of current values of a current transformer (CT). A frequency sweep may also be used in determining correct phase delay compensation of each measured current in applications having multiple frequencies. Phase delay compensation for each CT current value may be stored in a phase delay compensation look-up table during the phase delay compensation sweep calibration and recalled from the look-up table during operational power measurements. Phase delay compensation for each CT current value and each frequency of that current value may be stored in a phase delay compensation look-up table during the phase delay compensation sweep calibration and recalled from the look-up table during operational power measurements.