ABB RES670 Applications Manual page 260

Section 16
Monitoring
254
XHiLim: High limit. Set as % of YBase (Y is SBase for S,P,Q UBase for Voltage
measurement and IBase for current measurement).
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
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 86: Calibration curves
1MRK 511 407-UEN C
86 (example).
Phasor measurement unit RES670 2.2 IEC
Application manual