A computer-controlled current-comparator-based load loss standard for calibrating high-voltage power measurement systems

A computer-controlled load loss standard, based on the current-comparator technique, for calibrating high-voltage power measurement systems is described. Measurements can be made at any power factor from zero lag through unity to zero lead, positive or negative power, at voltages up to 100 kV, currents up to 1000 A, and 50 or 60 Hz. The load loss standard features current-comparator-based components including a high-voltage active divider, a unity-gain integrator for producing an accurate and stable reactive component, a high-current transconductance amplifier with the ability to provide a highly accurate current to a circuit that is operated at high voltage, and a computer for control and data reduction. The load loss standard has accuracies of better than 500 ppm in magnitude and 20 ppm in phase.<>