Table of Contents
Advertisement
Main safety risks related to the bushing handling and its operative conditions are:
• Transport and handling of heavy and large parts.
• Lifting and moving of heavy and not well-balanced goods.
• Work operations under the crane and suspended materials.
• Work at height. All operation at height must be performed on a suitable certified platform.
• Risk of falling down of heavy parts during the installation.
• Risks deriving from un-proper balancing of the masses that can cause un-expected rotation during the
installation of the bushing on the transformer or on the test turret.
•
Risks related to the use of un-proper tools or wrong operations.
• Risks deriving from un-proper installation or operation on the bushing when filled by SF6 gas at rated
filling pressure (risk of explosion).
• Environmental risks related to dispersion of SF6 gas in the atmosphere or mineral oil in the environment.
• Severe electrical shock risk related to the extremely high voltage DC level of the equipment.
• Severe electrical shock risk due to un-proper realization of the bushing grounding connections.
• Severe electrical shock risks deriving by the fact that the composite insulator and the other main parts of
the bushing remain electrically charged at high voltage for a long period of time after the plant de-
energizing and the bushing grounding. Before starting any work on the de-energized bushing, check the
discharge by touching all surface of the composite insulator and all other parts of the bushing with an
insulated grounding rod which length must be ≥ 3m. During this operation the workers must wear
protective insulating gloves and boots and helmets with protective transparent face shield.
2.1
Safety prescriptions and operative information
The following notes are mandatory for personnel involved in transformer bushing installation. All problems
detected during the bushing installation must be reported to the Foreman and to GE Energy Connections RPV
Supervisor.
HVDC TRANSFORMER BUSHINGS
WARNING: The PHI bushing is a gas pressurized device. Operations on valves,
pressure gauges, pipes, protective devices must be performed by qualified operators,
with the proper equipment.
Foreman and operators have to take careful for handling the pressurized equipment.
It is strictly forbidden to move, lift and install equipment that is under pressure. Check
through appropriate gauge that the gas side of the bushing is at a pressure less than
or equal to 0.125 MPa abs (0.25 bar gauge) before operate on it.
WARNING:
Never use damaged or not certified lifting equipment.
WARNING:
Lifting equipment must be under a planned maintenance routine.
Operators must be qualified and properly trained.
WARNING:
Work in quote will be done by trained operators on adequate and certified moving
platforms. Workers that will operate in quote must use the prescribed safety devices
and in addition they must wear certified safety harnesses.
WARNING: Lifting equipment will be entrusted only to specialized personnel, kept in
efficiency and clean. Identification and rating plates must be always present and visible
on the equipment. Do not use the equipment when rating plates are missed or
unreadable.
WARNING: The equipment is filled with SF6 gas. This gas is not environmentally
friend. Always use an appropriate gas filling machine that allows the SF6 recovery.
Avoid any dispersion of the gas in the environment.
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page 4 of 70
Advertisement
Table of Contents
