GE PHI 530.1425.2500 Operating And Maintenance Instructions Manual page 68

HVDC TRANSFORMER BUSHINGS
Item Description
Bushing lifting from the crate and
4
preparation for the installation
Bushing installation on the transformer
5
turret
Transformer turret final filling and oil
6
recirculation
PHI 530.1425.2500
IS 2664 GB
PHI 265.850.1500
Page 68 of 70
Kepco project
Activity
Control the status the lifting equipment and relevant tools and control the crane status
and characteristics.
Install the lifting equipment on the bushing in accordance with the instruction manual at
Paragraph 5.4.
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.
Lift the bushing from the crate in accordance with the instruction manual.
Remove the plastic protection from the bottom cone and accurately clean it with a no-
fiber fabric cloth.
Control the bottom terminal, the MC blades and the small centering resin cone.
Incline the bushing in accordance with the installation conditions with oil expansion
vessels upward.
Check the inclination angle of the bushing and of the transformer turret
Drain the oil from the transformer turret (min 200- 500 litres)
Open the turret manhole providing that any foreign material will not drops inside
Insert the bushing into the turret
Control the effectiveness of the electrical plug-in contact with the transformer leads
Fix the bushing flange on the transformer turret
Connect the grounding cables to the bushing flange
Check the correct position of the valves from the bushing to the expansion vessels and
control the warranty seals
Remove all lifting devices
Remove the Transport pressure gauge (and store it for future re-use) (see Paragraph
3.1)
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
Limits / recording Action on problems
Do not proceed with the operation if tools are
See instruction manual
damaged or not available.
See instruction manual
See instruction manual
Retaining torques as in Table 7
See instruction manual
Remove any foreign material from cone,
bottom terminal and flange
--- Contact GE Energy Connections RPV
See instruction manual
See instruction manual
Follow the indications of the Transformer
manufacturer
See instruction manual
In case of damages on the cone surface:
- Contact GE Energy Connections RPV.
Check that the cone will not interfere with the
- Remove the bushing from the turret and
metal parts of the turret and the CT and that the
put it on the stationary support.
oil side cone is not damaged.
- Close the transformer turret with the
No damages on the cone are allowed.
manhole.
Stop the activities and wait for instructions.
Check to be done in accordance with the Remove the bushing and control the MC
Transformer manufacturer instructions.
Lock the bolts with the torque prescribed by the
Transformer Manufacturer
2
Min. total cross section 300 mm Bushing installation on the transformer turret
Open the valves and seal them with the
Valves in Open position warranty lead seal (GE Energy Connections
---
Gauge removed
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.
Date
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blades on the bottom terminal
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RPV supervisor).
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Signature