It is possible to calibrate the measuring function above to get better then class 0.5
presentation. This is accomplished by angle and amplitude 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, amplitude and angle)
•
U: sequence voltages (positive, zero and negative sequence, amplitude and
angle).
10.1.3
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)
:
S
Apparent three-phase power
P
Active three-phase power
Q
Reactive three-phase power
PF
Power factor
ILAG
I lagging U
ILEAD
I leading U
U
System mean voltage, calculated according to selected mode
I
System mean current, calculated according to selected mode
F
Frequency
Relevant settings and their values on the local HMI under
Main menu/
Settings/IED settings/Monitoring/Servicevalues(P_Q)/CVMMXN(P_Q)
:
1MRK 511 423-UEN A
Section 10
Monitoring
Bay control REC650 2.2 IEC
195
Application manual
