XLowLim
: Low limit. Set as % of
YBase
(Y is
SBase
for S,P,Q
UBase
for Voltage measurement
and
IBase
for current measurement).
XLowLowLim
: Low-low limit. Set as % of
YBase
(Y is
SBase
for S,P,Q
UBase
for Voltage
measurement and
IBase
for current measurement).
XLimHyst
: Hysteresis value in % of range and is common for all limits.
All phase angles are presented in relation to defined reference channel. The parameter
PhaseAngleRef
defines the reference.
Calibration curves
It is possible to calibrate the functions (CVMMXN, CMMXU, VMMXU and VNMMXU) to get class
0.5 presentations of currents, voltages and powers. This is accomplished by amplitude and
angle compensation at 5, 30 and 100% of rated current and voltage. The compensation curve
will have the characteristic for amplitude and angle compensation of currents as shown in
figure
195 (example). The first phase will be used as reference channel and compared with the
curve for calculation of factors. The factors will then be used for all related channels.
IEC05000652 V2 EN-US
Figure 195: Calibration curves
14.1.4.1 Setting examples
SEMOD54481-4 v5
Three setting examples, in connection to Measurement function (CVMMXN), are provided:
• Measurement function (CVMMXN) application for a OHL
• Measurement function (CVMMXN) application on the secondary side of a transformer
• Measurement function (CVMMXN) application for a generator
For each of them detail explanation and final list of selected setting parameters values will be
provided.
1MRK 505 370-UEN D Section 14
Monitoring
Busbar protection REB670 357
Application manual
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