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Running Generator
7UM62 Manual
C53000-G1176-C149-3
A.5 100–% Stator Earth Fault Protection with Primary Load Resistor
3. Insert now on the primary side a resistance which corresponds to the tripping val-
ue (e.g. 2 kΩ). Check the measured fault resistance (R SEF=). If this resistance
differs very much from the value expected, modify SEF Rps accordingly and, if
necessary, make a fine adjustment with the correction angle (PHI I SEF).
Read out now the fault resistance, and set this value as the tripping threshold at
address 5303 R<< SEF TRIP.
Next, insert a fault resistance for the alarm stage (e.g. 5 kΩ) on the primary side,
and read out the fault resistance (R SEF=) from the operational measured values.
This value is set at address 5302 as R< SEF ALARM.
4. Finally, a series of measurements is performed, starting with 0 kΩ and proceeding
in steps of 1 kΩ. If changes are made to the correction angle (PHI I SEF) or to
the contact resistance (SEF Rps), the settings for the trip stage (R<< SEF TRIP)
and the alarm stage (R< SEF ALARM) must be matched as required.
With the generator running the trip stage and the alarm stage must be checked. Again,
insert a fault resistance on the primary side, and check the fault resistance in the op-
erational measured values. If the resistance differs from the values at standstill, the
correction angle and/or the transfer resistance can be somewhat modified. To do so,
adapt the settings at address 5302 R< SEF ALARM and 5303 R<< SEF TRIP. These
values are also active with the generator at stand-still.
501
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