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