The measuring functions CMMXU, VMMXU and VNMMXU are located under:
Main menu/Measurement/Monitoring
/CurrentPhasors(I)/CMMXU
Main menu/Measurement/Monitoring/VoltagePhasors, phase-phase(U)/
VMMXU
Main menu/Measurement/Monitoring/VoltagePhasors, phase-neutral(UN)/
VNMMXU
CMMXU, VMMXU and VNMMXU provide physical quantities:
• I: phase currents (amplitude and angle) (CMMXU)
• U: voltages (phase-to-earth and phase-to-phase voltage, amplitude and angle)
(VMMXU, VNMMXU)
Fundamental frequency filtered values (DFT) or true RMS values can be selected
as a measurement type in CMMXU, VMMXU and VNMMXU functions.
The measuring functions CMSQI and VMSQI are located under:
Main menu/Measurement/Monitoring/CurrentSequenceComponents(Isqi)/
CMSQI
Main menu/Measurement/Monitoring/VoltageSequenceComponents(Usqi)/
VMSQI
CMSQI and VMSQI provide sequence component quantities:
• I: sequence currents (positive and zero sequence, amplitude and angle)
• U: sequence voltages (positive and zero sequence, amplitude and angle).
It is possible to calibrate the measuring function to get better than class 0.5
presentation. This is accomplished by angle and amplitude compensation at 5%,
30% and 100% of the rated current and at 100% of the rated voltage.
15.1.3 Zero clamping
GUID-8DABC3F5-6615-493C-B839-A5C557A2FAE8 v4
Measuring functions CVMMXN, CMMXU, VMMXU and VNMMXU have no
interconnections regarding any settings or parameters.
Zero clampings are also handled entirely by ZeroDb separately for each function's
every output signal. For example, zero clamping of U12 is handled by
UL12ZeroDb in VMMXU, zero clamping of I1 is handled by IL1ZeroDb in
CMMXU, and so on.
Example of CVMMXN operation
Outputs seen on the local HMI under Main menu/Measurements/Monitoring/
Servicevalues(P_Q)/CVMMXN(P_Q):
1MRK 506 375-UEN A Section 15
Monitoring
Railway application RER670 2.2 IEC 381
Application manual
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