Precision measurement of harmonic current and power at industrial frequency

The precision measurement for harmonic current and power up to 60^th order and some validating experiments is reported. The uncertainty of harmonics current reference to fundamental is less than 36 muA/A (k=2) for range up to 50 A. The uncertainty of harmonic power reference to the fundamental apparent power is less than 42 muW/VA (k=2) for voltage and current range up to 500 V and 50 A.