Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
437
Figure 3-38 Directional check with holmgreen connection
If in an isolated network the voltage connections for the reactive current measurement should be kept for test-
ing, then it should be noted that for a power flow with inductive component in forwards direction a backwards
direction results (contrary to an earth fault in this direction).
Shut down generator after completion of the directional tests. Correct connections must be restored and
double-checked.
Spill Current
For calibration to the spill current, a three-pole short-circuit bridge that is able to withstand rated current is in-
stalled at the circuit breaker. Start up generator and slowly excite it until the rated machine current is reached.
Read out the operational measured value I
EE2
. This measured value determines the setting value of address
5003 3I0>. Parameter 3I0> should be about twice that measured value to ensure a sufficient security margin
between the earth fault current used for directional determination and the spill current. Next, check whether the
protection zone determined by the setting value U0> must be reduced.
Activate the stator earth fault protection: Address 5001 S/E/F PROT. = ON.
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