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HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
15
of
70
5.5 Bushing installation on the transformer
The complete installation operation must be performed in presence of the transformer Manufacturer Foreman
and GE Energy Connections RPV Supervisor.
The transformer turret must be designed to withstand vacuum and provided with proper filtering valves to allow
the oil filling under vacuum and the oil recirculation inside the barrier system
After the bushing installation, the turret final oil filling must be done under vacuum. The oil characteristics inside
the barrier system must comply with the data listed in
Table 13
.
The residual air trapped inside the turret can be evacuated by the de-aeration screw located on the bushing
flange.
It is under the responsibility of the transformer Manufacturer to guarantee that the interface between the barriers
internal electrical shield and the bottom side of the bushing complies with the installation quote indicated in the
bushing Outline drawing (see
Figure 7
).
Bushing PHI 265
Bushing PHI 530
Figure 7 – Bushings bottom side and interface quote with the transformer barrier shield
WARNING:
Before proceeding with the installation of the bushing on the transformer, it is necessary that the
bushing gas pressure is set at the transport value
(0.25 bar gauge, 0.125MPa abs)
.
NOTE:
Check that the oil inside the turret barriers complies with the parameters listed in
Table 13
.
Here below the complete installation procedure:
•
Prepare the transformer turret for the
installation.
•
Be careful to avoid any foreign material
from dropping inside the turret during
the bushing installation.
•
It is recommended to install on the
flange of the transformer turret
minimum 4 centring pins to ensure the
proper alignment of the bushing with
the insulation pressboard barriers. (not
supplied by GE RPV).
•
Start lifting the bushing in horizontal
from its wooden platform.
•
Act on Tirfor (Item 2) in order to ensure
the horizontal lifting.
Install the guiding
pins on the turret
flange
Mandatory interface quote
with the transformer barrier
system
Mandatory interface quote
with the transformer barrier
system
Содержание PHI 265.850.1500
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