ABB Relion 650 Series Technical Manual page 429

1MRK 506 326-UUS B
The user can set the hysteresis (
operating and reset value at each operating point, in wide range for each measuring channel
separately. The hysteresis is common for all operating values within one channel.
Actual value of the measured quantity
The actual value of the measured quantity is available locally and remotely. The measurement is
continuous for each measured quantity separately, but the reporting of the value to the higher
levels depends on the selected reporting mode. The following basic reporting modes are available:
• Cyclic reporting (
• Magnitude dead-band supervision (
• Integral dead-band supervision (
Cyclic reporting
The cyclic reporting of measured value is performed according to chosen setting (
measuring channel reports the value independent of magnitude or integral dead-band reporting.
In addition to the normal cyclic reporting the IED also report spontaneously when measured value
passes any of the defined threshold limits.
Y
Value Reported
(1st)
(*)Set value for t: XDbRepInt
IEC05000500 V1 EN-US
Figure 230: Periodic reporting
Magnitude 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 (
new value to a higher level, if this is detected by a new measured value. This limits the information
flow to a minimum necessary. Figure
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.
Line distance protection REL650
Technical manual
XLimHyst ), which determines the difference between the
Cyclic )
Int deadband )
Value Reported
Y2
Y1
t (*)
231
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Dead band )
Value Reported
Y3
Y4
t (*) t (*)
XZeroDb ), then the measuring channel reports the
shows an example with the magnitude dead-band
Section 13
Monitoring
SEMOD54417-150 v3
SEMOD54417-158 v3
XRepTyp ). The
Value Reported
Value Reported
Y5
t (*)
en05000500.vsd
SEMOD54417-163 v3
t
423