ABB RET670 Applications Manual page 759

1MRK504116-UUS C
Application manual
Xmin: Minimum value for analog signal X set directly in applicable measuring unit.
Xmax: Maximum value for analog signal X.
XZeroDb: Zero point clamping. A signal value less than XZeroDb is forced to zero.
Observe the related zero point clamping settings in Setting group N for CVMMXN
(VGenZeroDb and IGenZeroDb). If measured value is below VGenZeroDb and/or
IGenZeroDb calculated S, P, Q and PF will be zero and these settings will override
XZeroDb.
XRepTyp: Reporting type. Cyclic (Cyclic), magnitude deadband (Dead band) or
integral deadband (Int deadband). The reporting interval is controlled by the parameter
XDbRepInt.
XDbRepInt: Reporting deadband setting. Cyclic reporting is the setting value and is
reporting interval in seconds. Magnitude deadband is the setting value in % of
measuring range. Integral deadband setting is the integral area, that is, measured value
in % of measuring range multiplied by the time between two measured values.
XHiHiLim: High-high limit. Set in applicable measuring unit.
XHiLim: High limit.
XLowLim: Low limit.
XLowLowLim: Low-low limit.
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, see section
Calibration curves
It is possible to calibrate the functions (CVMMXN, CMMXU, VNMMXU and
VMMXU) to get class 0.5 presentations of currents, voltages and powers. This is
accomplished by magnitude and angle compensation at 5, 30 and 100% of rated current
and voltage. The compensation curve will have the characteristic for magnitude and
angle compensation of currents as shown in figure
be used as reference channel and compared with the curve for calculation of factors.
The factors will then be used for all related channels.
IED application
"Analog inputs".
305 (example). The first phase will
Section 3
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