ABB RED650 Technical Manual page 528

Section 15
Monitoring
Y
Value Reported
(1st)
Y1
IEC99000529 V2 EN-US
Figure 260: Amplitude dead-band supervision reporting
522
Value Reported
Value Reported
Y3
Y
Y2
Y
Y
Y
After the new value is reported, the ±ΔY limits for dead-band are automatically set
around it. The new value is reported only if the measured quantity changes more
than defined by the ±ΔY set limits.
Integral dead-band reporting
The measured value is reported if the time integral of all changes exceeds the pre-
set limit (XDbRepInt), figure 261, where an example of reporting with integral
dead-band supervision is shown. The picture is simplified: the process is not
continuous but the values are evaluated with a time interval of one execution cycle
from each other.
The last value reported, Y1 in figure
measurement. A difference is calculated between the last reported and the newly
measured value and is multiplied by the time increment (discrete integral). The
absolute values of these integral values are added until the pre-set value is
exceeded. This occurs with the value Y2 that is reported and set as a new base for
the following measurements (as well as for the values Y3, Y4 and Y5).
The integral dead-band supervision is particularly suitable for monitoring signals
with small variations that can last for relatively long periods.
Y
Y
261 serves as a basic value for further
Line differential protection RED650 2.2 IEC
1MRK 505 394-UEN A
Value Reported
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IEC99000529-2-en.vsdx
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