GEAFOL- / CARECO-Cast-resin Transformer/ Operating Instructions
© 2021 Siemens Energy
Page 22
Potential faults
Faults
Potential causes
Test steps / Remedy
Transformer too hot,
Warning / alarm message
from the temperature
sensors of coils
Permanent overload
Check load / load distribution,
reduce load if necessary
Screw connections on live parts
untighten
Tighten Screw connections on energized ter-
minals, torque values see chap. 6, table 6.2
Bad ventilation, ambient tempera-
ture too high
Check the ventilation ducts on the housing,
fan and cooler, replace defective component if
necessary
Sensor defect
Check the function of the relevant sensor,
if necessary, replace the sensor
Transformer too hot,
Warning / alarm message
from the temperature
sensors of core
Permanent overvoltage
Check voltage, reduce voltage if necessary
Short circuit (triggering a
monitoring unit)
Inrush current too high
Adjust inrush current
Dirt
Clean the transformer, see chap. 8.
Humidity too high
Check ventilation, remove water, clear water
drainage,
Traces of soot on the
transformer (Tracking)
Dirt
Clean the transformer, see chap. 8, check ven-
tilation
Screw connections on live parts
untighten
Check screw connections, see chap. 8.
Crack / chipped material
on high voltage coil mit
soot
Short circuit in coil
Call customer service - Do not switch the
transformer on again!
Smell
Evaporation after commissioning
No action - the odor disappears after a few
hours
Dirt in the coils or on the core
Clean the transformer, see chap. 8.
Unusual noises
High voltage too high
Check voltages, if necessary reduce the volt-
age
Vibration of the housing,
Tigthen of loose components,
attach vibration damper if necessary
Table 9-2
