Section 7
Calibrating injection based 100%
stator earth fault protection
7.1
Commissioning process
GUID-F7897190-70E1-4421-984B-8E0F06BB93CD v1
The commissioning process utilizes the commissioning tool ICT. The instructions for the
process cover installation, calibration, commissioning, monitoring and auditing for the 100%
stator earth fault STTIPHIZ function.
7.2
Commissioning tool ICT
GUID-06D3DD66-7D49-4D92-A175-AD1AE5ED19C3 v3
The 100% stator earth fault protection STTIPHIZ functions in IED requires 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. The ICT tool 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 such are needed during the commissioning.
When ICT is started, 100% stator earth fault protection is chosen.
There are five different parts of the ICT tool to be performed during 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
During the installation, several checks are performed about both status of the function and
levels of the injected current and voltage. The check of signal levels need the setting of the
UMaxEF according to the value that is selected in REX060: this parameter is related to the gain
of amplifiers of REX060.
A fine measurement of the frequency of the injected signals is also performed to be able to
detect properly interference conditions.
Calibrating
The calibration is based on three measurement steps.
1MRK 502 067-UEN B
Section 7
Calibrating injection based 100% stator earth fault protection
63
Commissioning manual
