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Component
Bushing oil
Gas density monitors
and
oil
pressure
gauge
Bushing overall gas
leakage
Gas quality
HVDC TRANSFORMER BUSHINGS
Time base
Description
Every
2
years,
Perform an oil DGA in accordance to
when the plant is
IEC 61464.
off
Check calibration and operation of
5 years
micro switches.
Check with SF6 leak-meter device all
5 years
the flanges joints and the DILO
valves.
Check the gas dew point at line
5 years
pressure
Table 19 – Bushing general maintenance plan
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page 33 of 70
Notes
Contact
GE
Energy
Connections RPV in case
of evidence of problems
and provide all DGA
data.
Check the effective and
correct operation of the
alarms & tripping signal
chain
from
instruments
to
substation systems.
Anticipate the control if
the
leakage
rate
excessive and gas re-
filling is frequent. Identify
the leakage areas.
In case of frequent re-
filling,
plan
for
replacement
of
bushing and contact GE
Energy
Connections
RPV.
Regenerate / replace the
gas if moisture exceeds
the limits of dew point
≥-18° C at line pressure.
the
the
is
the
the
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