TIDUEM8B Design guide | 德州仪器 TI.com.cn

TIDUEM8B March 2019 – February 2021

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3.2.2.2 Electricity Meter Metrology Accuracy Results

For the following test results, gain and phase calibration are applied to the meter. In the following results, the active energy results are within 0.1% at 0° phase shift. At 60° and –60° phase shift, which is allowed to have relaxed accuracy in electricity meter standards, the trend where the results deviate at higher currents is from the CT phase shift varying across current. Additionally, the active energy vs. voltage results and the RMS voltage results show that good accuracy results are able to be obtained despite using only a fraction of the ADC range for the voltage channels.

Table 3-5 Phase A Active Energy % Error Versus Voltage, Two-Voltage Mode

VOLTAGE (V)	% ERROR
240	0.0113
120	–0.0067
60	–0.01
30	–0.012
15	–0.015

Table 3-6 Phase A Active Energy % Error Versus Current, Two-Voltage Mode

CURRENT (A)	0°	60°	–60°
0.05	–0.02	0.007	–0.062
0.10	–0.025	0.017	–0.057
0.25	–0.007	0.031	–0.051
0.50	0.001	0.029	–0.031
1.00	0.0075	0.034	–0.021
2.00	0	0.04	–0.036
5.00	0.003	0.019	–0.019
10.00	0.007	0.009	–0.004
20.00	–0.007	0.006	–0.013
30.00	0.0007	–0.002	0.006
40.00	0.002	–0.007	0.013
50.00	–0.009	–0.04	0.032
60.00	–0.0007	–0.049	0.0445
70.00	0.0003	–0.052	0.058
80.00	0.004	–0.064	0.074
90.00	0.01	–0.065	0.0845
100.00	0.014	–0.07	0.101

Figure 3-17 Phase A Active Energy % Error Versus Current, Two-Voltage Mode

Table 3-7 Phase B Active Energy % Error Versus Voltage, Two-Voltage Mode

VOLTAGE (V)	% ERROR
240	0.011
120	–0.0003
60	–0.004
30	–0.0047
15	–0.0067

Table 3-8 Phase B Active Energy % Error Versus Current, Two-Voltage Mode

CURRENT (A)	0°	60°	–60°
0.05	–0.032	–0.007	–0.122
0.10	–0.019	0.019	–0.083
0.25	–0.019	0.032	–0.058
0.50	–0.007	0.045	–0.062
1.00	–0.007	0.045	–0.045
2.00	–0.015	0.032	–0.06
5.00	–0.007	0.026	–0.036
10.00	–0.0087	0.009	–0.025
20.00	–0.019	–0.019	–0.028
30.00	–0.019	–0.036	–0.011
40.00	-0.023	–0.045	0
50.00	–0.014	–0.06	0.0395
60.00	–0.011	–0.075	0.045
70.00	–0.01	–0.074	0.054
80.00.	–0.0077	–0.08	0.064
90.00	0.003	–0.068	0.066
100.00	0.011	–0.042	0.052

Figure 3-18 Phase B Active Energy % Error Versus Current, Two-Voltage Mode

Table 3-9 Cumulative Phase Active Energy % Error Versus Voltage, Two-Voltage Mode

VOLTAGE (V)	% ERROR
240	0.0353
120	0.022
60	0.016
30	0.014
15	0.013

Table 3-10 Cumulative Phase Active Energy % Error Versus Current, Two-Voltage Mode

CURRENT (A)	0°	60°	–60°
0.05	0.019	0.045	–0.032
0.10	0.006	0.058	–0.032
0.25	0.0125	0.045	–0.0385
0.50	0.006	0.032	–0.032
1.00	0.015	0.045	–0.019
2.00	0.003	0.045	–0.039
5.00	0.006	0.024	–0.012
10.00	0.01	0.0165	0
20.00	–0.007	0.002	–0.013
30.00	0.002	–0.007	0.0085
40.00	0	–0.016	0.019
50.00	–0.003	–0.035	0.042
60.00	0.002	–0.047	0.053
70.00	0.009	–0.047	0.063
80.00.	0.007	–0.05	0.067
90.00	0.013	–0.045	0.08
100.00	0.0223	–0.04	0.092

Figure 3-19 Cumulative Phase Active Energy % Error Versus Current, Two-Voltage Mode

Table 3-11 Cumulative Phase Active Energy % Error Versus Voltage, One-Voltage Mode

VOLTAGE (V)	% ERROR
240	–0.005
120	–0.024
60	–0.031
30	–0.036
15	–0.043

Table 3-12 Cumulative Phase Active Energy % Error Versus Current, One-Voltage Mode

CURRENT (A)	0°	60°	–60°
0.05	–0.058	–0.045	–0.147
0.10	–0.045	–0.007	–0.096
0.25	–0.019	0.019	–0.083
0.50	–0.0255	0.032	–0.07
1.00	–0.011	0.019	–0.058
2.00	–0.017	0.025	–0.07
5.00	–0.0233	0.011	–0.053
10.00	–0.0177	0.005	–0.04
20.00	–0.026	–0.0023	–0.0355
30.00	–0.017	–0.019	–0.0123
40.00	–0.013	–0.0225	–0.01
50.00	–0.031	–0.058	–0.001
60.00	–0.023	–0.06	0.012
70.00	–0.0183	–0.058	0.023
80.00.	–0.005	–0.052	0.027
90.00	–0.009	–0.049	0.036
100.00	0.0013	–0.045	0.045

Figure 3-20 Cumulative Phase Active Energy % Error Versus Current, One-Voltage Mode

Table 3-13 Cumulative Reactive Energy % Error Versus Current, Two-Voltage Mode

CURRENT (A)	30°	60°	–30°	–60°
0.05	–0.003	0.004	–0.023	–0.027
0.10	–0.037	–0.013	0.011	–0.008
0.25	–0.067	–0.027	0.043	0.002
1.00	–0.044	–0.021	0.0415	0.011
5.00	–0.036	–0.0183	0.022	0.001
10.00	–0.03	–0.012	0.014	–0.003
20.00	–0.041	–0.026	–0.0035	–0.013
40.00	–0.01	–0.016	–0.021	–0.016
60.00	0.025	–0.0007	–0.047	–0.0247
80.00	0.041	0.0085	–0.048	–0.021
100.00	0.054	0.02	–0.044	–0.012

Figure 3-21 Cumulative Reactive Energy % Error Versus Current, Two-Voltage Mode

Table 3-14 Cumulative Active Energy Measurement Error Versus Frequency, ±2 Hz From Nominal Frequency

CONDITIONS	58 Hz	60 Hz	62 Hz
0.5 A, 0	0.006	0.0017	–0.007
0.5 A, 60	0.058	0.032	0.032
0.5 A, 300	–0.045	–0.032	–0.032
10 A, 0	0.0047	–0.001	–0.0033
10 A, 60	0.025	0.0073	0.008
10 A, 300	–0.0105	–0.009	–0.013

Table 3-15 Phase A RMS Current % Error, Two-Voltage Mode

CURRENT (A)	GUI CURRENT READING (A)	REFERENCE METER READING (A)	% ERROR
0.05	0.050053	0.050031	0.0440
0.10	0.100039	0.099988	0.0510
0.25	0.250034	0.24997	0.0256
0.50	0.50005	0.49992	0.0260
1.00	1.00017	0.99979	0.0380
2.00	2.00021	1.9996	0.0305
5.00	5.00039	4.9986	0.0358
10.00	10.0013	9.9971	0.0420
20.00	20.0007	19.993	0.0385
30.00	30.0025	29.991	0.0383
40.00	40.0038	39.988	0.0395
50.00	50.0054	49.989	0.0328
60.00	60.0066	59.984	0.0377
70.00	70.0091	69.981	0.0402
80.00.	80.0127	79.981	0.0396
90.00	90.018	89.976	0.0467
100.00	100.024	99.974	0.0500

Figure 3-22 Phase A RMS Current % Error, Two-Voltage Mode

Table 3-16 Phase B RMS Current % Error, Two-Voltage Mode

CURRENT (A)	GUI CURRENT READING (A)	REFERENCE METER READING (A)	% ERROR
0.05	0.050083	0.05005	0.0659
0.10	0.100055	0.10002	0.0350
0.25	0.250019	0.24996	0.0236
0.50	0.500016	0.49989	0.0252
1.00	1.00008	0.99984	0.0240
2.00	2.00016	1.9999	0.0130
5.00	4.99979	4.9987	0.0218
10.00	9.99998	9.9982	0.0178
20.00	19.9986	19.998	0.0030
30.00	29.9948	29.992	0.0093
40.00	39.9936	39.99	0.0090
50.00	49.9918	49.983	0.0176
60.00	59.9906	59.979	0.0193
70.00	69.9921	69.981	0.0159
80.00.	79.9924	79.976	0.0205
90.00	89.9942	89.97	0.0269
100.00	99.9997	99.97	0.0297

Figure 3-23 Phase B RMS Current % Error, Two-Voltage Mode

Table 3-17 Phase A RMS Voltage % Error, Two-Voltage Mode

VOLTAGE (V)	GUI VOLTAGE READING (V)	REFERENCE METER READING (V)	% ERROR
9	9.002	9.0034	–0.0155
10	10.003	10.004	–0.0100
30	29.999	30.002	–0.0100
50	50.002	49.999	0.0060
70	70.004	70.001	0.0043
90	90.007	89.999	0.0089
100	100.01	100	0.0100
120	120.016	120	0.0133
140	140.025	140.01	0.0107
160	160.028	160	0.0175
180	180.035	180	0.0194
200	200.049	200	0.0245
220	220.057	220	0.0259
230	230.067	230	0.0291
240.	240.074	240	0.0308
260	260.087	260.02	0.0258
270	270.104	270.03	0.0274

Figure 3-24 Phase A RMS Voltage % Error, Two-Voltage Mode

Table 3-18 Phase B RMS Voltage % Error, Two-Voltage Mode

VOLTAGE (V)	GUI VOLTAGE READING (V)	REFERENCE METER READING (V)	% ERROR
9	8.999	9	–0.0111
10	9.99995	9.9995	0.0045
30	29.997	29.997	0.0000
50	49.999	49.995	0.0080
70	70.002	70	0.0029
90	90.009	90.002	0.0078
100	100.01	100	0.0100
120	120.017	120	0.0142
140	140.027	140.01	0.0121
160	160.03	160.01	0.0125
180	180.042	180	0.0233
200	200.056	200.01	0.0230
220	220.069	220.01	0.0268
230	230.079	230.02	0.0256
240.	250.087	250.02	0.0268
260	260.103	260.03	0.0281
270	270.114	270.03	0.0311

Figure 3-25 Phase B RMS Voltage % Error, Two-Voltage Mode

Table 3-19 Active Energy % Error Versus Current, 32 ksps

CURRENT (A)	0°	60°	–60°
0.05	0.033	0.078	0.028
0.1	0	0.002	–0.02
0.25	0.0225	0.035	–0
0.5	0.0183	0.032	–0.03
1	0.0063	–0.0063	–0.02
2	–0.0123	0.023	–0.04
5	0.008	0.014	–0.01
10	0.0025	0.004	–0
20	–0.013	–0.019	–0.02
30	–0.0077	–0.028	7E-04
40	–0.025	–0.045	0.018
50	0.0027	–0.07	0.061
60	–0.002	–0.075	0.076
70	0.002	–0.0833	0.085
80	–0.0015	–0.09	0.099
90	0.003	–0.096	0.109
100	0.009	–0.099	0.125

Figure 3-26 Active Energy % Error Versus Current, 32 ksps.