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

Table 2

100 Hz current measurement comparison.

AC current (A) signal frequency 100 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	0.99	0.99	0.99	0.98	0.99	0.98
5.00	5.00	4.99	5.00	4.97	4.98	4.99
10.00	10.04	9.98	10.01	9.99	9.98	10.01
25.00	25.09	24.81	25.11	24.90	24.98	24.94
40.00	38.98	39.01	38.64	39.85	40.04	39.96
55.00	52.18	51.95	52.02	54.24	54.43	54.32