HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
68
of
70
Item Description
Activity
Limits / recording
Action on problems
Date
Signature
4
Bushing lifting from the crate and
preparation for the installation
Control the status the lifting equipment and relevant tools and control the crane status
and characteristics.
See instruction manual
Do not proceed with the operation if tools are
damaged or not available.
Install the lifting equipment on the bushing in accordance with the instruction manual at
Paragraph 5.4
.
See instruction manual
---
Check the proper position of the centering upper plate on the bushing flange, of the
locking torque and control the proper installation of the wire rope.
See instruction manual
Retaining torques as in
Table 7
---
Lift the bushing from the crate in accordance with the instruction manual.
See instruction manual
---
5
Bushing installation on the transformer
turret
Remove the plastic protection from the bottom cone and accurately clean it with a no-
fiber fabric cloth.
Remove any foreign material from cone,
bottom terminal and flange
---
Control the bottom terminal, the MC blades and the small centering resin cone.
---
Contact GE Energy Connections RPV
Incline the bushing in accordance with the installation conditions with oil expansion
vessels upward.
See instruction manual
---
Check the inclination angle of the bushing and of the transformer turret
See instruction manual
---
Drain the oil from the transformer turret (min 200- 500 litres)
Follow the indications of the Transformer
manufacturer
---
Open the turret manhole providing that any foreign material will not drops inside
See instruction manual
---
Insert the bushing into the turret
Check that the cone will not interfere with the
metal parts of the turret and the CT and that the
oil side cone is not damaged.
No damages on the cone are allowed.
In case of damages on the cone surface:
- Contact GE Energy Connections RPV.
- Remove the bushing from the turret and
put it on the stationary support.
- Close the transformer turret with the
manhole.
Stop the activities and wait for instructions.
Control the effectiveness of the electrical plug-in contact with the transformer leads
Check to be done in accordance with the
Transformer manufacturer instructions.
Remove the bushing and control the MC
blades on the bottom terminal
Fix the bushing flange on the transformer turret
Lock the bolts with the torque prescribed by the
Transformer Manufacturer
---
Connect the grounding cables to the bushing flange
Min. total cross section 300 mm
2
Bushing installation on the transformer turret
Check the correct position of the valves from the bushing to the expansion vessels and
control the warranty seals
Valves in Open position
Open the valves and seal them with the
warranty lead seal (GE Energy Connections
RPV supervisor).
Remove all lifting devices
---
---
Remove the Transport pressure gauge (and store it for future re-use) (see
Paragraph
3.1)
Gauge removed
---
6
Transformer turret final filling and oil
recirculation
Put the turret under vacuum and fill with treated oil.
Recirculate the turret until oil parameters are in line with
Table 13
data.
Drain the trapped air inside the turret from the bushing De-aeration screw
Oil final characteristics:
Water content by KF at 20°C: ________ ppm
Breakdown voltage on 2.5 mm gap: ___ kV
Total gas content: _________________ ppm
Power factor at 90°C: ______________
Resistivity at 30°C: ________________
Ω
x m
Particle content ISO class: __________
No air has to remain trapped inside the
transformer turret.
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