ABB Relion 670 series, Installation And Commissioning Manual

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11.6 Verifying calibration
After the calibration is performed, it is appropriate to verify that known faults are
measured as expected and that the function is indicating trips and alarms when it
should, in other words that the calibration was successful. For this purpose the
monitoring feature can be used.
1. In the ICT toolbar, select the fourth tab, Monitoring .
Logger feature
Currently measured
impedance and its
average
Selectable quantity for
plotting
Selectable graph
update period
Currently used reference
IEC11000050-1-en.vsd
GUID-DCE099B6-4DBA-4A52-9566-0E20B8AF7712 V1 EN
Figure 81: 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 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.
1MRK 502 029-UEN A
Section 11
Calibrating injection based 100% stator earth fault protection
129
Installation and commissioning manual