Hitachi Relion 650 Series Technical Manual page 177

1MRK 511 557-UEN Rev. A
D0E12000T201305151403 V1 EN-US
Figure 89:
Amplitude dead-band supervision
If a measuring value is changed, compared to the last reported value, and the change is larger than
the ±ΔY pre-defined limits that are set by user (UDbRepIn), then the measuring channel reports the
new value to a higher level. This limits the information flow to a minimum necessary.
shows an example with the amplitude dead-band supervision. 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.
Y
Value Reported
(1st)
D0E12009T201305151403 V1 EN-US
Figure 90: 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.
Technical Manual
Y
Value Reported
Value Reported
(1st)
Y1
t (*)
(*)Set value for t: XDbRepInt
Periodic reporting
Value Reported
Y2
DY
DY
Y1
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Value Reported
Y3
Y2
t (*)
Value Reported
DY
Y3
DY
DY
DY
Value Reported
Value Reported
Y4
Y5
t (*) t (*)
Value Reported
Section 12
Monitoring
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Figure 90
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