A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High-Precision Power Analyzers

Table 3

500 Hz current measurement comparison.

AC current (A) signal frequency 500 Hz
Standard value	The old method			The proposed method
	Phase A	Phase B	Phase C	Phase A	Phase B	Phase C
0.10	0.10	0.10	0.10	0.10	0.10	0.10
0.50	0.49	0.50	0.49	0.49	0.49	0.49
1.00	0.98	0.97	0.98	0.98	0.99	0.98
5.00	5.01	4.99	5.00	4.99	5.01	4.99
10.00	10.04	9.97	10.02	9.97	9.98	10.01
25.00	25.25	24.76	25.21	24.95	24.95	24.90
40.00	38.68	38.89	38.35	39.88	40.02	39.97
55.00	51.84	51.72	51.88	54.34	54.45	54.40