Section 10 Calibrating injection based sensitive rotor
earth fault protection
10.1 Commissioning process
The commissioning process utilizes the commissioning tool ICT. The instructions
for the process cover installation, calibration, commissioning, monitoring and
auditing for the sensitive rotor earth fault ROTIPHIZ function.
10.2 Commissioning tool ICT
The sensitive rotor earth fault protection function in IED require a number of
settings. The settings k1, k2 and the reference impedance require measurements on
the generator performed by the ICT (injection commissioning tool). The factors are
derived in connection to the calibration measurements during commissioning. ICT
is an integrated part of the PCM600 tool.
Furthermore, ICT also assists the commissioning engineer to perform a successful
installation because of its structure and validating capabilities. During installation,
commissioning and calibration, ICT performs various tests to verify that the
installation is acceptable and the calibration successful. Besides carrying out the
actual tests, ICT also provides the commissioning engineer with tips if needed
during the commissioning.
When ICT is started, rotor earth fault protection is chosen.
There are five different parts of the ICT tool to be performed at commissioning and
operation:
1. Installing
2. Calibrating
3. Commissioning
4. Monitoring
5. Auditing
Before proceeding make sure that all necessary connections are in place.
Installing
When the injection is started, check that the injected voltage and current are within
the permissible limits. If not, adjust the settings in the injection unit REX060. The
ICT tool will check automatically for slight differences between actual injected and
1MRK 502 029-UEN A Section 10
Calibrating injection based sensitive rotor earth fault protection
107
Installation and commissioning manual
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