參數(shù)資料
型號(hào)： ADE7758
廠商： Analog Devices, Inc.
英文描述： Poly Phase Multifunction Energy Metering IC with Per Phase Information
中文描述： 多相多功能電能計(jì)量IC每相位信息
文件頁(yè)數(shù)： 44/68頁(yè)
文件大小： 1584K
代理商： ADE7758
ADE7758
is approximately 16 kHz. A sample set of meters could be tested
to find a more exact value of the pulse output at full scale.
Rev. A | Page 44 of 68
To calculated the values for APCFNUM/APCFDEN and
VARCFNUM/VARCFDEN use the following formulas
FULLSCALE
TEST
FULLSCALE
V
NOM
V
NOMINAL
I
I
kHz
APCF
×
×
=
16
(27)
( )
θ
×
×
×
600
,
×
000
=
cos
,
NOM
V
TEST
EXPECTED
I
MC
APCF
(28)
=
EXPECTED
NOMINAL
APCF
APCF
INT
APCFDEN
(29)
where
MC
is the meter constant,
I
TEST
is the test current,
V
NOM
is
the nominal voltage that the meter is tested at, and
V
FULLSCALE
and
I
FULLSCALE
are the values of current and voltage, which
correspond to the full scale ADC inputs of the ADE7758. θ is
the angle between the current and the voltage channel, and the
APCF
EXPECTED
value is equivalent to the reference meter output
under the test conditions.
The equations for calculating the VARCFNUM and
VARCFDEN during VAR calibration are similar, with one
exception
( )
θ
×
×
×
600
,
×
=
sin
000
,
NOM
V
TEST
EXPECTED
I
MC
VARCF
(30)
Because the CFNUM and CFDEN values can be calculated
from the meter design, these values can be written to the part
automatically during production calibration.
Step 5: Set the test system for I
TEST
, V
NOM
, and the unity power
factor. For VAR calibration, the power factor should be set to 0
in this step. For watt and VA, the unity power factor should be
used. VAGAIN can be calibrated at the same time as WGAIN
because VAGAIN can be calibrated at the unity power factor,
and both pulse outputs can be measured simultaneously.
However, when calibrating VAGAIN at the same time as
WGAIN, the rms offsets should be calibrated first (see the
Calibration of IRMS and VRMS Offset section).
Step 6: Measure the percent error in the pulse output, APCF
and/or VARCF, from the reference meter:
%
100
–
%
×
=
REF
REF
CF
CF
APCF
Error
(31)
where
CF
REF
=
APCF
EXPECTED
= the pulse output of the reference
meter.
Step 7: Calculate xWG adjustment. One LSB change in xWG
(12 bits) changes the WATTHR register by 0.0244% and
therefore APCF by 0.0244%. The same relationship holds true
for VARCF.
=
EXPECTED
APCF
[
[
]
]
[
12
]
+
×
×
2
0
:
11
0
:
11
0
:
11
xWG
APCFDEN
APCFNUM
APCF
NOMINAL
(32)
%
0244
.
%
–
Error
xWG
=
(33)
When APCF is calibrated, the xWATTHR registers have the
same Wh/LSB from meter to meter if the meter constant and
the APCFNUM/APCFDEN ratio remain the same. The
Wh/LSB constant is
WDIV
APCFNUM
APCFDEN
C
M
000
,
LSB
Wh
1
4
1
×
×
×
=
(34)
Step 8: Return to Step 2 to calibrate Phase B and Phase C gain.
Example—Watt Gain Calibration of Phase A
Using Pulse Output
For this example,
I
TEST
= 10 A,
V
NOM
= 220 V,
V
FULLSCALE
= 500 V,
I
FULLSCALE
= 130 A,
MC
= 3200 impulses/kWh,
Power Factor
= 1,
and
Frequency
= 50 Hz.
Set APCFNUM(0x45) and APCFDEN(0x46) to the calculated
value to perform a coarse adjustment on the imp/kWh ratio.
Using Equations 27 through 29.
kHz
542
.
130
10
500
220
16
=
×
×
=
kHz
APCF
NOMINAL
( )
Hz
96
.
cos
600
,
000
,
220
10
×
200
,
=
×
×
×
=
EXPECTED
APCF
277
Hz
96
.
Hz
542
=
=
INT
APCFDEN
With I
TEST
, V
NOM
, and the unity power factor, the example
ADE7758 meter shows 1.92 Hz on the pulse output. This is
equivalent to a 2.04% error from the reference meter value
using Equation 31.
%
04
.
%
100
Hz
96
.
Hz
96
.
–
Hz
92
.
%
=
×
=
Error
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