Maintainence After Energizing - GE KOTEF-72 Instruction Manual

Instruction Manual
If required, small quantity of oil can be
taken. Always verify oil level indicator
before take oil samples.
Never complete oil volume without
prior formal authorization of GE.
Important remark:
During commissioning,
recommended to register the values
acquired for each of the performed
tests in order to compare with future
measurements during the Combined
Transformer
measurements taken in the factory are
important as so the measurements
during commissioning
Combined Transformer.
comparison between
measured at the field allows following
the evolution of each parameter.

9. MAINTAINENCE AFTER ENERGIZING

After installation and energizing, the
OSKF72 shall not require any further
intervention. However, it is suggested
performing visual inspections during
the first weeks of service in order to:
 Verify the position of oil level
indicator. KOTEF72 in the same
circuits shall have similar oil
levels. If
significantly below or above the
green level, in comparison with
other KOTEF72,
recommended
presence of any of leaking. If
leaking is found, remove the
OSKF72 from
inform GE;
© GE Grid Solutions
it is
lifetime. The
of each
The
test results
the indicator is
it is
checking the
operation and
 Verify if there is no oil leakage;
 With an infrared imaging device,
check if the primary terminal
connections are not overheating.
Compare with other KOTEF72
from the same circuit.
After one year of operation, it is advised
a detailed inspection of tightening
torques and oil leakage and thereafter
twice per year according to the
substation maintenance contract.
If possible, GE suggests disconnecting
the KOTEF72 and to perform the
following examinations:
1) Insulator: Depending
pollution level, it is necessary to
clean the porcelain;
2) Metallic components: check for
corrosion;
3) Tightening torque of primary and
secondary connections.
adjustments shall be carried out as
described in the item "Primary
Terminals" of this document;
4) Secondary terminal
necessary clean inside the terminal
box.
5) Verify oil level indicator and if there
is any signal of oil leakage;
6) Remove the top cover to have
access to the bellows and verify if
there is any signal of oil leakage
near the fixation of the bellows and
/ or if the bellows is in good
condition.
on the
Any
box: If
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