ABB RED650 - Page 149

IEC99000529-2-en.vsdx
Y
t
Value Reported
(1st)
Value Reported
Value Reported
Y1
Y2
Y3
Y
Y
Y
Y
Y
Y
Value Reported
IEC99000529 V2 EN-US
Figure 63: Amplitude dead-band supervision reporting
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
SEMOD54417-167 v4
The measured value is reported if the time integral of all changes exceeds the pre-
set limit (XDbRepInt), figure
64, 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
64 serves as a basic value for further
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.
1MRK 505 394-UEN A Section 7
Impedance protection
Line differential protection RED650 2.2 IEC 143
Technical manual