Verifying Calibration - ABB REG670 Commissioning Manual

Section 7
Calibrating injection based 100% stator earth fault protection
7.6
84
that statistically the signal noise is "filtered out". This results in a fairly
accurate impedance measurement which can be used as an alternative
reference.
5. Click the Select button when the standard deviation has converged so that its
magnitude is within the noise level of the measured absolute impedance.
In the second commissioning sub tab, Step2 : Save Reference Impedance, the
measured real and imaginary reference 2 impedance is presented.
6. Select the Submit to Parameter setting button.
This forwards the newly acquired reference to Parameter setting.
7. Write the newly acquired real and imaginary parts of Reference 2 to IED.

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.
Currently used reference
GUID-DCE099B6-4DBA-4A52-9566-0E20B8AF7712 V1 EN-US
Figure 24: 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.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Selectable quantity for
plotting
Currently measured
impedance and its
average
1MRK 502 073-UEN A
GUID-3805BA77-6369-4798-8E1B-1201A0B9C68A v2
Selectable graph
update period
Logger feature
IEC11000050-1-en.vsd
Commissioning manual