Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
434
Figure 3-36 Earth fault with busbar connection
For this test, connections must be such that the generator is galvanically connected with the load equipment.
If the plant conditions do not allow this, the hints given overleaf under the side title „Directional check without
Loading Resistor“ must be observed.
Start up generator and slowly excite it until the stator earth fault protection picks up: Indication „U0> picked
up“ (not allocated when delivered from factory). At the same time the indication „3I0> picked up“ should
appear (not allocated when delivered from factory).
Read out operational measured values U
E
and I
EE2
. If the connections are correct, this value corresponds to
the machine terminal voltage percentage, referred to rated machine voltage (if applicable, deviating rated
primary voltage of earthing transformer or neutral earthing transformer must be taken into account). This value
also corresponds to the setting value U0> in address 5002.
The measured value I
EE2
should be approximately equal to or slightly higher than the setting value 3I0> under
address 5003. This is to ensure that the protection zone that is determined by the setting value U0> is not
reduced by too slow pick-up.
For protection zone Z, the following applies:
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