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ADE7754
and voltage gain registers. See the Current RMS Calculation
and Voltage RMS Calculation sections. Only the effect of the
apparent power gain is shown on Figure 35. The minimum
output range is given when the apparent power gain register
content is equal to 800h and the maximum range is given by
writing 7FFh to the apparent power gain register. This can be
used to calibrate the apparent power (or energy) calculation
in the ADE7754 for each phase and the total apparent energy.
See the Total Apparent Power Calculation section.
The total apparent power calculated by the ADE7754 depends on
the configuration of the VAMOD bits in the VAMode register.
Each term of the formula used can be disabled or enabled by the
setting VASEL bits, respectively, to Logic 0 or Logic 1 in the
VAMode register. The different configurations are described in
Table IV.
Table IV. Total Apparent Power Calculation
APPARENT
VAMOD VASEL0
VASEL1
VASEL2
POWER
13A929h
D1B71h
68DB9h
00000h
VOLTAGE CHANNEL AND
CURRENT CHANNEL 0.5V/GAIN
+ 150% FS
+ 100% FS
+ 50% FS
AVAGAIN[11:0]
0d
1d
2d
V ARMS × I ARMS
V ARMS × I ARMS
V ARMS × I ARMS
+ V BRMS × I BRMS
+(V ARMS + V CRMS )
/2 I BRMS
+ V ARMS × I BRMS
+ V CRMS × I CRMS
+ V CRMS × I CRMS
+ V CRMS × I CRMS
F97247h
– 50% FS
F2E48Fh
EC56D7h
000h
7FFh 800h
– 100% FS
– 150% FS
Note that V ARMS , V BRMS , V CRMS , I ARMS , I BRMS , and I CRMS represent
the voltage and current channels RMS values of the corresponding
registers.
Figure 35. Apparent Power Calculation Output Range
Apparent Power Offset Calibration
For example, for VAMOD = 1, the formula used to process the
apparent power is
Total Apparent Power = V ARMS × I ARMS × ? 1 +
?
Each rms measurement includes an offset compensation register
to calibrate and eliminate the dc component in the rms value.
See the Current RMS Calculation and Voltage RMS Calculation
?
?
AVAG ?
2 12 ?
× I BRMS × ? 1 +
?
sections. The voltage and current rms values are then multiplied
in the apparent power signal processing. Because no additional
offsets are created in the multiplication of the rms values, there
+
( V ARMS + V CRMS )
2
?
?
BVAG ?
2 12 ?
+ V CRMS CRMS × ? 1 +
× I
?
is no specific offset compensation in the apparent power signal
processing. The offset compensation of the apparent power
measurement in each phase is done by calibrating each indi-
?
?
CVAG ?
2 12 ?
vidual rms measurement.
TOTAL APPARENT POWER CALCULATION
The sum of the apparent powers coming from each phase gives
the total apparent power consumption. Different combinations
of the three phases can be selected in the sum by setting Bits 7
and 6 of the VAMode register (mnemonic VAMOD[1:0]). Figure 36
demonstrates the calculation of the total apparent power.
The polyphase meter configuration determines which formula
should be used to calculate the apparent energy. The American
ANSI C12.10 standard defines the different configurations of
the meter. Table V describes which mode should be chosen for
different configurations.
Table V. Meter Form Configuration
PHASE A
ANSI
Meter Form
VAMOD
VASEL
I A
V A
AAPGAIN
RMS
RMS
V ARMS
24
AVAGAIN
5S/13S
6S/14S
8S/15S
9S/16S
3-wire Delta
4-wire Wye
4-wire Delta
4-wire Wye
0
1
2
0
3 or 5 or 6
7
7
7
AVGAIN
PHASE B
Different gain calibration parameters are offered in the ADE7754
to cover the calibration of the meter in different configurations.
I B
V B
BAPGAIN
RMS
RMS
24
BVAGAIN
TOTAL APPARENT
POWER SIGNAL
The APGAIN, VGAIN, and VAGAIN registers have different
purposes in the signal processing of the ADE7754. APGAIN
registers affect the apparent power calculation but should be
used only for active power calibration. VAGAIN registers are
BVGAIN
used to calibrate the apparent power calculation. VGAIN regis-
V ARMS
+
+
%
ters have the same effect as VAGAIN registers when VAMOD =
0 or 2. They should be left at their default value in these modes.
PHASE C
V CRMS
2
VGAIN registers should be used to compensate gain mismatches
between channels in VAMOD = 1.
I C
V C
CAPGAIN
RMS
RMS
V CRMS
24
CVAGAIN
As mentioned previously, the offset compensation of the phase
apparent power calculation is done in each individual rms mea-
surement signal processing. See the Apparent Power Offset
Calibration section.
CVGAIN
Figure 36. Total Apparent Power Calculation
REV. 0
–25 –
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