ABB REG670 Commissioning Manual page 89

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Calibrating injection based 100% stator earth fault protection
The injection commissioning tool (ICT) helps the commissioning engineer to
acquire additional references for different conditions of the generator. The below
description assumes that reference 1 was set during calibration and that a second
reference must be set now.
If the second reference impedance shall be defined and the logic to switch from the
first impedance to the second one is already active in the configuration, then set the
second reference impedance equal to the first reference impedance before starting
the procedure in the Commissioning tab. The trip of the function should be
blocked, as advised by the pop-up window of ICT.
A similar approach is advised for the other available reference impedances.
1. Ensure that the generator is in a state where the reference must be set (for
example normal operation).
2. To start, select the Commissioning tab.
3. In the Reference impedance selection drop-down menu. select Reference 2.
4. To start reading the measurements, click the Start reading values from IED
button in the ICT toolbar.
ICT starts to read the selected viewed quantity from IED and plots values on
the X/Y graph.
Measured absolute
impedance
GUID-FAE32C52-80F0-4AEF-AA0D-6BA39F896712 V1 EN-US
Figure 23: Commissioning tab
Normally continuous readings are performed and the read absolute impedance
is viewed in the plot.
By observing the standard deviation of the measured impedance, the
commissioning engineer can decide if the impedance of the generator is
stable/settled, and also if the average impedance is based on enough values so
Measured absolute
Floating average of the impedance ± standard
measured absolute deviation
impedance
Reference Impedance
Selection dropdown
menu
Section 7
IEC11000046-1-en.vsd
83