Each analog output has a corresponding supervision level output (X_RANGE). The
output signal is an integer in the interval 0-4, see section
Calibration of analog inputs
SEMOD54417-293 v5
Measured currents and voltages used in the CVMMXN function can be calibrated to
get 0.5 class measuring accuracy. This is achieved by magnitude and angle
compensation at 5, 30 and 100% of rated current and voltage. The compensation below
5% and above 100% is constant and linear in between, see example in figure
.
100
30
5
IMagComp5
IMagComp30
IMagComp100
-10
+10
Magnitude
compensation
% of In
Measured
current
% of In
0-5%:
Constant
5-30-100%: Linear
>100%:
Constant
100
30
5
IAngComp5
IAngComp30
IAngComp100
-10
+10
Angle
compensation
Degrees
Measured
current
% of In
ANSI05000652_3_en.vsd
ANSI05000652 V3 EN-US
Figure 202:
Calibration curves
The first current and voltage phase signal, in the group signals will be used as
reference. The magnitude and angle compensation will be used for other related input
signals.
Low pass filtering
SEMOD54417-233 v4
In order to minimize the influence of the noise signal on the measurement it is possible
to introduce the recursive, low pass filtering of the measured values for P, Q, S, V, I
and power factor. This will make slower measurement response to the step changes in
1MRK 511 408-UUS A
Section 16
Monitoring
Phasor measurement unit RES670 2.2 ANSI
519
Technical manual
Содержание Relion RES670
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