Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
413
Note
For the settings, only secondary values should be used. If you find during the conversion from secondary to
primary values that the theoretical conversion factor is not quite correct, FACTOR R SEF should be modified
to match the measuring results (for conversion formulae refer to Section 2.31.2).
If the indication „20 Hz voltage missing“ to be received from the 20 Hz generator is allocated to one of the binary
inputs, and the delivery setting of this input has been changed for this purpose, the binary input can be checked
as well.
Switch off the supply voltages of the 20 Hz generator.
Feedback „>U20 failure“ (not allocated on delivery).
Indication „SEF100 Failure“ (not allocated on delivery).
Reconnect the supply voltages of the 20 Hz generator.
If you make use of the possibility to block the 100% stator earth fault protection by binary input, the functioning
of the input should be checked.
Activate binary input „>SEF100 BLOCK“.
Feedback „SEF100 BLOCKED“.
Further tests are performed with the machine running.
Note
If within the framework of routine tests the band pass 7XT34 is to be checked as well, short-circuit the earthing
or neutral transformer on the secondary side with the machine standing still, and switch the 20 Hz generator
on. Multiply the operational measured value I
SEF
with the transformation ratio of the miniature CT (e.g. 400 A/
5 A). The flowing current must exceed 3 A. If the current is significantly less, the resonance frequency of the
bandpass has changed. It can be better matched by adding or removing capacitors (see also operating instruc-
tions for the 7XT33, Order No. C53000–B1174–C129).
Finally, remove the shorting link and check the galvanic isolation with the operational measured value U SEF .
To Next Page
Loading...
Need help?
General
