ABB Relion 670 Series Installation And Commissioning Manual page 117

1MRK 502 029-UEN A
Installation and commissioning manual
Calibrating injection based sensitive rotor earth fault protection
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.
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.
GUID-3C7F0567-2367-46E4-9606-FCFC7408DAA0 V1 EN
Figure 68:
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.
8. Once again, wait until the stability criteria is fulfilled, then select the Submit
button.
ICT automatically shifts to the third calibration tab, Step3: Calibration step
3.
It is very important that calibration steps 1 to 3 is performed
in the proper order. If not, the calibration might fail.
ICT calibration tab 1 including the stability region indicator bar
Section 10
Stability region
indicator bar
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