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
Figure 189:
Magnitude 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
The measured value is reported if the time integral of all changes exceeds the pre-set limit
(
XDbRepInt
, 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
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 511 365-UUS A
Section 16
Monitoring
Phasor measurement unit RES670 2.1 ANSI
509
Technical manual
Содержание Relion 670 Series RES670
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