5. Activate the injection by turning the injection switch to on position on the
injection unit REX060.
6. Select the Start reading from IED button from the ICT toolbar to start
performing continuous measurements.
7. Verify that the bars/voltage levels for both the voltage and current on the
injected frequency have acceptable level.
The bars must be green and the function status field must also indicate OK.
8. Check that the actual injected frequency is close enough to the injection
frequency set on the injection unit (REX060).
If the voltage and/or current level(s)/frequencies are not reasonable, or the
ICT indicates other warnings/abnormalities in the function status field, verify
that the HW connections are proper (cables etc.), and selected gains and
injection frequency on the REX060 is properly selected. Then repeat steps 3
to 6. Note that the FreqInjected setting in Parameter setting for the specific
function must correspond with the chosen injection frequency on the REX060
HMI for that function.
IEC11000045-1-en.vsd
Frequency found by
the function
Voltage and current signal
staus and TRIP indication
Ffunction status field. Errors and
abnormalities are displayed in order
to simplify trouble shooting.
GUID-84947C77-215F-4007-AAC0-9433B8444396 V1 EN
Figure 77: ICT signals and function indication panel
9. When you are ready to perform calibration, select the Submit and save in
report button. ICT will now forward a more accurate frequency to Parameter
setting. In Parameter setting, write the newly acquired parameter to IED.
11.4 Performing calibration
1. From the Calibration tab, select the first sub tab, i.e. Step1: Calibration
step 1.
2. Make sure you have not attached any additional impedance in parallel with
the stator.
3. From the ICT toolbar, select the Start reading from IED button.
ICT now performs continuous measurements and after the tenth measurement
it starts to update the graph. Notice that the stability region indicator bar
reduces in size.
1MRK 502 029-UEN A Section 11
Calibrating injection based 100% stator earth fault protection
125
Installation and commissioning manual
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