10.5 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
IEC11000046-1-en.vsd
GUID-FAE32C52-80F0-4AEF-AA0D-6BA39F896712 V1 EN
Figure 70: 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 502 029-UEN A Section 10
Calibrating injection based sensitive rotor earth fault protection
113
Installation and commissioning manual
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