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3.2
Lifting conditions
Lifting operation must be done by qualified operators and with certified ropes and equipment.
Lifting points are indicated on the crate and are reinforced by steel plates (see Figure 2). Lifting the crate by
fork lift is not allowed.
WARNING: The centre of gravity point of the crate could be not perfectly centred respect the crate geometry.
Care must be taken during the lifting and moving operation to prevent dangerous situations, damages or heavy
shocks to the good.
3.3
Storage conditions
For short period storage, up to 1 month, the package can be stored outside, just protected by a suitable additional
tarpaulin. The storage area must have a concrete floor made in such a way to ensure a sufficient drainage of
water.
For long time storage, it is necessary that the whole crate is placed inside a suitable warehouse and that a
periodical check, every six months, of the bushing, the gas pressure and of relevant accessories will be
activated.
In this case, it is also recommended to increase the gas pressure to 0.5 bar gauge (0.150 MPa abs).
GE Energy Connections RPV must be informed concerning the activation of the long storage condition.
The periodical controls must verify the bushing conditions, the gas pressure and its dew point and the overall
status of the electric instruments, the accessories and tools. All data must be recorded in a specific check list.
NOTE: Violation of the above prescriptions will cause the immediate termination of the warranty.
If the bushing is installed on the transformer and the complete transformer is stored as spare unit, it is necessary
to perform the following actions:
Set the gas pressure to 0.5 bar gauge (0.150 MPa abs).
•
Protect the composite insulator with a PE double thickness bag.
•
Remove the top toroids and wrap them in bubble PE foils then put them in a suitable wooden box to be
•
stored in a covered warehouse.
Record the gas pressure and the oil pressure and the ambient temperature for future reference.
•
Control and protect the pressure gauges, PF tap and relevant accessories with PE foils and silica gel
•
bags.
Seal all cable passages from the electrical cubicles and protect them with PE foils and silica gel bags.
•
Activate a periodical check, at least every six months, to check the status of the bushing, the gas
•
pressure that must be ≥ 0.3 bar gauge (0.13 MPa abs) and oil pressure.
HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
Figure 2 – Crate lifting arrangement
IS 2664 GB
Page 7 of 70
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