Measurements Cvmmxn - ABB Relion Technical Manual

Section 14
Monitoring
14.1.2
14.1.2.1
508
• 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 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).
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.

Measurements CVMMXN

Identification
Function description
Measurements
IEC 61850 IEC 60617
identification identification
CVMMXN
P, Q, S, I, U, f
SYMBOL-RR V1 EN
1MRK 502 048-UUS A
ANSI/IEEE C37.2
device number
-
Technical manual