ABB Relion 650 Series Applications Manual page 198

Section 12
Monitoring
• P, Q and S: three phase active, reactive and apparent power
• PF: power factor
• V: phase-to-phase voltage magnitude
• I: phase current magnitude
• F: power system frequency
The output values are displayed in the local HMI under Main menu/Tests/Function status/
Monitoring/CVMMXN/Outputs
The measuring functions CMMXU, VNMMXU and VMMXU provide physical quantities:
• I: phase currents (magnitude and angle) (CMMXU)
• V: voltages (phase-to-ground and phase-to-phase voltage, magnitude and angle) (VMMXU,
VNMMXU)
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 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).
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.
12.4.3 Setting guidelines
The available setting parameters of the measurement function CVMMXN, CMMXU, VMMXU,
CMSQI, VMSQI, VNMMXU are depending on the actual hardware (TRM) and the logic configuration
made in PCM600.
The parameters for the Measurement functions CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,
VNMMXU are set via the local HMI or PCM600.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
Operation : Disabled / Enabled . Every function instance (CVMMXN, CMMXU, VMMXU, CMSQI, VMSQI,
VNMMXU) can be taken in operation (
The following general settings can be set for the Measurement function (CVMMXN).
PowMagFact : Magnitude factor to scale power calculations.
PowAngComp : Angle compensation for phase shift between measured I & V.
192
The power system quantities provided, depends on the actual hardware, (TRM) and
the logic configuration made in PCM600.
Enabled ) or out of operation ( Disabled ).
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