6.5 Acquiring references
To detect different operation conditions of the generator and select proper impedance
reference requires logic outside the injection function. Therefore changing/switching
impedance reference is not described here but in a separate application note
1MRG005030 Application example for injection based 100% Stator EF and Sensitive
Rotor EF 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.
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 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
Figure 14: 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/
1MRK502053-UEN B Section 6
Calibrating injection based sensitive rotor earth fault protection
Generator protection REG670 2.0 IEC 63
Commissioning manual
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