Calibration of analog inputs
SEMOD54417-293 v4
Measured currents and voltages used in the CVMMXN function can be calibrated to get class 0.5
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 539: Calibration curves
The first current and voltage phase in the group signals will be used as reference and the
magnitude and angle compensation will be used for related input signals.
Low pass filtering
SEMOD54417-233 v3
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 the measured quantity.
Filtering is performed in accordance with the following recursive formula:
1MRK 502 066-UUS B
Section 16
Monitoring
1037
Technical manual
Содержание Relion 670 series
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