ABB REG670 Commissioning Manual page 79

1MRK 502 073-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
Calibrating injection based sensitive rotor earth fault protection
Currently used reference
Currently measured
impedance and its
average
GUID-DCE099B6-4DBA-4A52-9566-0E20B8AF7712 V1 EN-US
Figure 14: Monitoring tab
2. Set the graph update period to one second by typing 1 into the Graph update
period field.
3. To start continuously plotting values on the graph with one second interval, select
Start readings values from IED.
By default the measured absolute impedance is plotted, however there are several
items that can be viewed when monitoring. To see these, select the available
quantities under the Viewed quantity drop-down menu under the Monitoring
tab.
4. Observe the fault conductance while applying known faults.
Both the calibration factors and the reference that is used can be verified this way.
In some cases though, it is desired to be able to measure/view other quantities.
5. Select Fault conductance in the Viewed quantity drop-down menu.
The fault conductance is equal to 1/fault resistance, and is more suitable to view
when no faults or very small faults are applied/measured.
Due to the fact that no fault theoretically equals infinite fault resistance and
viewing this only plots unreliable values, it is better to view the fault
conductance, which is zero in this case.
As no fault is applied, the measured fault conductance must be close to zero.
Confirm this by viewing the graph.
It may be necessary to zoom in or out to properly view the measurements. For
instructions on this, see
6. Apply for example 10kΩ fault resistance.
Selectable quantity for
plotting
Editing features in graph.
Section 6
Selectable graph
update period
Logger feature
IEC11000050-1-en.vsd
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