General Maintenance Plan - GE PHI 530.1425.2500 Operating And Maintenance Instructions Manual

14

General maintenance plan

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