Howard HI-102 Overhead Transformer - Manual (Page 9)

Document 2.4.95, Revision 0
May, 2013
9
Fluid-Filled Overhead Distribution Transformers
Lifting and Handling
Overhead transformers may be lifted by crane or
hoist. Properly palletized transformers may also be
lifted by a forklift truck. Refer to the transformer
nameplate to determine the total weight of the
assembled transformer and make sure that the
lifting equipment, hooks, cables, slings and spreader
bars are adequate to perform a safe lift. Do not use
transformer bushings as handles, otherwise undue
stress may damage the bushing and cause a fluid
leak. Be aware that cooling radiators, if present,
are made of relatively thin metal and can be easily
damaged. Special care must be taken when handling
transformers, if the ambient temperature is below
minus 20°C (minus 4°F); otherwise, permanent
damage to the transformer may result.
Lifting the transformer by crane or hoist is
accomplished using the provided lifting lugs. Do not
lift from any points other than the provided lifting
lugs. Do not use holes in the lifting lugs for lifting.
These holes are for tie-down purposes only and are
not suitable for lifting. A spreader bar should be used
to keep the lifting cables or slings nearly vertical,
enabling a safe lift and reducing the likelihood of
tank deformation or damage to painted surfaces.
Transformers should be lifted in an upright position,
allowing the transformer to tilt no more than 15
degrees from vertical. Lifting cables or straps should
be no more than 20 degrees from vertical.
A forklift truck may also be used to lift overhead
transformers that are securely mounted on a shipping
pallet. Lifting forks must be of sufficient length to
extend completely under the pallet. Do not attempt to
lift an un-palletized transformer with a forklift truck.
▲
! WARNING
FAILURE TO FOLLOW THE INSTRUCTIONS BELOW
COULD RESULT IN DEATH OR SERIOUS PERSONAL
INJURY AND COULD ALSO RESULT IN DAMAGE TO
THE EQUIPMENT.
• Lifting equipment, including forklift trucks,
cranes, cables, straps, lifting bolts, hoist
rings and spreader bars, must be of
adequate capacity to safely lift the completely
assembled transformer.
• Keep unnecessary personnel clear while
unloading and moving the transformer.
Location and Mounting
Consult local and national codes to ensure that
the installation meets all applicable requirements.
Location of the transformer must permit it to operate
in conditions that meet the requirements specified
in the “Usual Service Conditions” section of IEEE
Standard C57.12.00. Operation not meeting these
service condition requirements will compromise
transformer capacity and reliability, unless the
transformer is designed specifically for operation
in conditions other than usual service conditions.
Contact the Howard Industries Transformer Division if
additional information is needed about location and
mounting issues not covered by these instructions
Overhead distribution transformers are not designed
to be tamper resistant and must be installed in
a location that is secure and accessible only by
authorized personnel. Allow adequate electrical
clearance between all live parts and between
live parts and ground points. Ensure that cooling
radiators are free of obstructions.
Hanger brackets are usually provided for direct
pole mounting of the transformer. Pole capacity
must be sufficient to support the weight of the
transformer. The installed transformer should not tilt
in any direction more than three degrees. Greater
tilt may compromise the insulating fluid coverage
of live parts within the tank and may prevent
insulating fluid from circulating properly through the
cooling radiators, if present. Improper circulation of
insulating fluid may cause overheating and could
result in reduced transformer life.
SECTION 3: INSTALLATION