The analysis and experiment for AC power standard basing on three parameters

The alternating current (AC) power standard is usually based on the DC power standard by means of an AC/DC thermoelectric comparator, or by means of an A/D converter and digital waveform calculation. In this article, the AC power standard can be based on three parameters - rms AC voltage, rms AC current, and phase between voltage and current. The error analysis proves that the AC power standard can be traced to the AC voltage standard, AC current standard, and phase angle standard. Sine wave distortion was considered as affecting the measurement error in the error analysis. The experimental results of the three parameters method give a conclusion that the uncertainty is below 0.05% above 400 Hz. The three parameters method provide a new path for AC power standard traceability.