HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
32
of
70
14
General maintenance plan
The general maintenance plan is described in the next
Table 19
.
Component
Time base
Description
Notes
Composite insulators See Chapter 13
Inspection and maintenance
See
Chapter 13
Gas SF6
When plant is off
Check
the
pressure
and
the
operation of the density monitors,
check the gas quality and the gas
dew point.
Visual control of pressure
at
bushing
density
meters.
Measure the gas purity
and gas dew point.
Bushing oil
When plant is off
Check the pressure
Control if the pressure is
in line with the diagram of
Figure 8
.
Oil leakages
When plant is off
Check for the presence of oil
leakages from the bushing flange,
along the oil pipe and on the relevant
fitting and expansion vessels
Contact
GE
Energy
Connections RPV in case
of
evidence
of
oil
leakages
from
the
bushing
parts
or
accessories.
Toroids
When plant is off
Clean the surface and check for
scratches or deformation.
Check the fixing bolts to the flanges.
Anticipate the controls if
UV
camera
reveals
corona inception.
Current terminals
When plant is off
Check for evidence of hot spots.
Check the terminals and tighten the
connecting bolts to the bushing
flange.
Check the cable clamps and the
bolting to the terminal.
Anticipate the controls if
IR camera reveals hot
spots.
Contact
GE
Energy
Connections RPV in case
of evidence of hot spots
during the inspection.
Grounding terminals
on
the
bushing
flange
When plant is off
Check for evidence of hot spots.
Check the connection integrity and
the bolt locking.
Verify the effectiveness of the
grounding.
Contact
GE
Energy
Connections RPV in case
of evidence of hot spots.
Power factors taps
(only if the bushing is
not equipped with
the voltage divider)
When plant is off
Remove the tap cap and clean
inside.
Check the internal spring-loaded
contact and clean it.
Perform a Megger 1 kV insulation
test R
ins
> 1 MOhm.
Carefully close and tighten the cap.
WARNING:
PF tap cap
MUST
be
accurately
closed. Missing the cap
could be dangerous and
it can cause an electrical
discharge
at
bushing
energization.
Voltage divider
When plant is off
Check that the PF adapter, the BNC
cable and the divider box does not
show any evidence of electrical
discharge. Control the status of the
components and the
electrical
connections inside the box.
Contact
GE
Energy
Connections RPV in case
of evidence of problems.
Содержание PHI 530.1425.2500
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