ABB REG670 Commissioning Manual page 75

1MRK 502 073-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
Calibrating injection based sensitive rotor earth fault protection
6. Type the value in ohm of the calibration resistance in the real part of the
Connected impedance field and type 0 in the imaginary part field.
This informs the ICT that we have connected a pure resistive impedance that has
a value equal to the typed one.
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.
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.
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.
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.
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.
Section 6
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