Amplitude Dead-Band Supervision; Integrating Dead-Band Supervision - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00
4.1 Amplitude dead-band
supervision
4.2 Integrating dead-band
supervision
Direct current measuring unit
These reporting modes are available:
• Periodic reporting
• Periodic reporting with dead-band supervision in parallel
• Periodic reporting with dead-band supervision in series
Users can select between two types of dead-band supervision:
• Amplitude dead-band supervision(ADBS)
• Integrating dead-band supervision (IDBS)
If the changed value—compared to the last reported value—is larger than
the ± ∆Y predefinied limits that are set by users, and if this is detected by
a new measuring sample, then the measuring channel reports the new
value to a higher level (Fig. 2). This limits the information flow to a mini-
mum necessary.
Y
∆ Y
∆ Y
Y1
1
Fig. 2

Amplitude dead-band supervision

After the new value is reported, the new + ∆Y limits for dead-band are
automatically set around it. The new value is reported only if the meas-
ured quantity changes more than defined by the new +∆Y set limits.
The value of the measured quantity is updated even if the changes do not
exceed the amplitude dead-band supervision limits. The measured value is
updated if the time integral of all changes exceeds the pre-set limits, see
Fig. 3. The shadowed areas represent the time integrals which exceed the
pre-set value of the integrating dead-band supervision.
The last value reported (Y1 in Fig. 3) serves as a basic value for further
measurement. A difference is calculated between the last reported and the
newly measured value during the new sample and is multiplied by the
new values reported
Y2
2 3 4
1MRK 580 154-XEN
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∆ Y
∆ Y
Y3
t
5 6
(x80154-2)