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 ± standard
deviation
Measured absolute
impedance
Floating average of the
measured absolute
impedance
Reference Impedance
Selection dropdown
menu
GUID-FAE32C52-80F0-4AEF-AA0D-6BA39F896712 V1 EN-US
Figure 13: 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/
1MRK 502 073-UUS A Section 6
Calibrating injection based sensitive rotor earth fault protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 71
Commissioning manual
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