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DANGER!
Warning of hazardous voltages on equipment components, e.g. due to capacitative
coupling with other components!
Nonobservance of the following measure will result in fatality, severe personal injury
or substantial material damage.
Primary steps may be undertaken only on machine standstill.
Before carrying out primary steps on components they must be earthed.
Figure 3-19
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 guidelines on the
next page under the margin title "Directional check without Loading Resistor" must be
observed.
Start up generator and slowly excite until the stator earth fault protection picks up: In-
dication "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
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 corre-
sponds to the setting value U0> in address 5002.
The measured value I
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 a too slow pickup.
7UM61 Manual
C53000-G1176-C127-3
and I
E
should be approximately equal to or slightly higher than the
EE
3.3 Commissioning
. If the connections are correct, this
EE
281
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