6.4 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
rotor.
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.
It is very important that calibration steps 1 to 3 is performed in
the proper order. If not, the calibration might fail.
4. When the bar has reached the stability region (turned green), select the Submit
button.
ICT automatically shifts to the second calibration sub tab, Step2: Calibration
step 2.
Stability region
indicator bar
GUID-3C7F0567-2367-46E4-9606-FCFC7408DAA0 V1 EN
Figure 12: ICT calibration tab 1 including the stability region indicator bar
5. Attach an 10kΩ known fault (10kΩ resistance to ground).
6. Type 10000 in the real part of the Connected impedance field and leave the
imaginary part field empty.
This informs the ICT that we have attached 10kΩ pure resistive impedance.
7. In the ICT toolbar, select the Start reading from IED button.
1MRK502053-UEN B Section 6
Calibrating injection based sensitive rotor earth fault protection
Generator protection REG670 2.0 IEC 61
Commissioning manual
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