ABB REG670 Commissioning Manual page 71

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Calibrating injection based sensitive rotor earth fault protection
7. In the ICT toolbar, select the Start reading values from IED button.
8. Once again, wait until the stability criteria is fulfilled, then select the Submit
button.
The result is stored for later calculations. ICT automatically shifts to the third
calibration tab, Step 3: Measurement 3.
9. Remove the known fault resistance attached earlier and apply a short circuit
instead.
10. In the ICT toolbar, select the Start reading values from IED button.
11. When the stability criteria are fulfilled, select the Submit button once again.
The result is stored for calculations. ICT automatically shifts to the fourth
calibration tab, Step 4: Save Calibration Factors. Here the newly calculated
complex factors k1 and k2 as well as the reference impedance 1 are presented.
The values of these parameters are calculated by ICT on the basis of the three
measurement steps described above.
12. ICT performs several checks on the measurement results of each steps in
order to verify that the change among measured impedances of the three steps
is high enough (too low changes may be related to a grounded system at the
beginning of the calibration) and that no problem affected the installation and
calibration procedure.
Check feedbacks in the Calibration result field to make sure that all tests
have been passed.
12.1. If a failure is indicated during one or more check(s), follow the
instructions/tips provided by the ICT in the Calibration result field.
12.2. If these tips do not solve the issue, then contact ABB Support.
If readings are not stable during the step, a warning to repeat
the step may be suggested; the step shall be repeated in order
to avoid that the calibration fails.
If readings are not stable during the step, a warning to repeat
the step may be suggested; the step shall be repeated in order
to avoid that the calibration fails.
Section 6
65