The CVMMXN function calculates three-phase power quantities by using fundamental
frequency phasors (DFT values) of the measured current respectively voltage signals. The
measured power quantities are available either, as instantaneously calculated quantities
or, averaged values over a period of time (low pass filtered) depending on the selected
settings.
It is possible to calibrate the measuring function above to get better then class 0.5
presentation. This is accomplished by angle and magnitude compensation at 5, 30 and
100% of rated current and at 100% of rated voltage.
The power system quantities provided, depends on the actual hardware,
(TRM) and the logic configuration made in PCM600.
The measuring functions CMSQI and VMSQI provide sequence component quantities:
•
I: sequence currents (positive, zero, negative sequence, magnitude and angle)
•
V: sequence voltages (positive, zero and negative sequence, magnitude and angle).
16.1.3
Function block
The available function blocks of an IED are depending on the actual hardware (TRM) and
the logic configuration made in PCM600.
CVMMXN
I3P*
V3P*
S
S_RANGE
P_INST
P
P_RANGE
Q_INST
Q
Q_RANGE
PF
PF_RANGE
ILAG
ILEAD
V
V_RANGE
I
I_RANGE
F
F_RANGE
ANSI10000016-1-en.vsd
ANSI10000016 V1 EN
Figure 181:
CVMMXN function block
1MRK 511 365-UUS A
Section 16
Monitoring
Phasor measurement unit RES670 2.1 ANSI
485
Technical manual
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