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Data Sheet
?6.732° to +1.107° and the resolution is 0.0176° (360° × 50 Hz/
1.024 MHz).
Given a phase error of x degrees, measured using the phase
voltage as the reference, the corresponding LSBs are computed
dividing x by the phase resolution (0.0211°/LSB for 60 Hz and
0.0176°/LSB for 50 Hz). Results between ?383 and +63 only are
acceptable; numbers outside this range are not accepted. If the
current leads the voltage, the result is negative and the absolute
value is written into the PHCAL registers. If the current lags the
voltage, the result is positive and 512 is added to the result
before writing it into xPHCAL.
ADE7880
Figure 63 illustrates how the phase compensation is used to
remove x = ?1° phase lead in IA of the current channel from the
external current transducer (equivalent of 55.5 μs for 50 Hz
systems). To cancel the lead (1°) in the current channel of
Phase A, a phase lead must be introduced into the corresponding
voltage channel. Using Equation 8, APHCAL is 57 least
significant bits, rounded up from 56.8. The phase lead is
achieved by introducing a time delay of 55.73 μs into the Phase
A current.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE7880 work on 32-, 16-, or 8-bit words. As
+ 512 , x > 0 ?
APHCAL , BPHCAL , or CPHCAL
? x ?
? , x ≤ 0 ?
? phase _ resolution ?
= ? ?
? x
? ?
? phase _ resolution ?
IAP
IA
IAN
VAP
VA
PGA1
PGA3
(9)
ADC
ADC
shown in Figure 62, APHCAL, BPHCAL, and CPHCAL 10-bit
registers are accessed as 16-bit registers with the six MSBs padded
with 0s.
15 10 9 0
0000 00 xPHCAL
Figure 62. xPHCAL Registers Communicated As 16-Bit Registers
PHASE
CALIBRATION
APHCAL = 57
VN
1°
IA
IA
VA
VA
PHASE COMPENSATION
ACHIEVED DELAYING
IA BY 56μs
50Hz
Figure 63. Phase Calibration on Voltage Channels
Rev. A | Page 37 of 104
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