Document 2.4.126, Revision 4
October 2017
6
Three-Phase Padmounted Distribution Transformers
Drawings and Documents
Locate all shipping papers, packing lists, outline
drawings, and other pertinent information for
use during inspection. The transformer outline
drawing indicates the location of nameplates and
warning labels, and provides physical dimensions
and weights. The nameplate provides electrical
characteristics, winding connections, and weights.
The wiring diagram provides details of any control,
fan and alarm wiring that may have been supplied.
Lifting and Handling
Lifting hooks are provided near the top of the
transformer tank for lifting. All four lifting hooks
must be used simultaneously. The transformer
must not be lifted from any points other than the
provided lifting hooks. Do not use holes in the
lifting hooks for lifting. These holes are for tie-down
purposes only and are not suitable for lifting.
Transformers should be lifted in an upright position,
allowing the transformer to tilt no more than 15°
from vertical. Lifting cables should be no more
than 20° from vertical. It is recommended that
a spreader bar be used to keep the lifting cables
nearly vertical to enable a safe lift and to reduce
the likelihood of tank deformation or damage to
painted surfaces.
Lifting the transformer with a forklift is not
recommended, since weight and balance can be
problematic and radiator panels can be easily
damaged. Refer to the transformer nameplate
to determine the total weight of the assembled
transformer. Special care must be taken when
handling transformers when the ambient
temperature is below minus 20°C (minus 4°F);
otherwise, permanent damage to the transformer
may result.
Initial Inspection
Although all transformers, components, and
accessories are carefully inspected and tested prior
to shipment, a thorough receiving inspection should
be conducted to detect any damage or loss that
might have occurred during shipment. The receiving
inspection should be completed upon receipt and
before unloading from the truck. Note any damage
or discrepancies on the bill of lading, file a claim
with the carrier, and notify the Howard Industries
Transformer Division prior to unloading the
transformer and before attempting any repair.
Before unloading the transformer, the following
checks should be performed:
1. Read the serial number on the transformer
nameplate and make sure it matches the serial
number listed on the shipping documents. Also,
check the nameplate for kVA rating, high-voltage
rating, low-voltage rating, impedance and other
design characteristics, and make sure they
comply with the specifications.
2. Check shipping documents to make sure
the shipment is complete, including all listed
accessories and hardware. Be aware that
additional items may arrive on separate
pallets. Claims for shortages or errors must
be noted on the shipping documents and
reported immediately to the Howard Industries
Transformer Division. Failure to make a timely
claim will constitute unqualified acceptance and
a waiver of all such claims by the purchaser.
3. The tank vacuum/pressure gauge may
indicate a positive or negative reading when
the transformer is received, depending on the
relative temperatures of the fluid and ambient
SECTION 2: RECEIVING, HANDLING AND STORAGE
WARNING
FAILURE TO FOLLOW THE INSTRUCTIONS
BELOW MAY CAUSE DEATH OR SERIOUS
PERSONAL INJURY AND/OR DAMAGE TO
THE EQUIPMENT.
• Use a crane, suitable lifting cables or
straps, and a spreader bar to unload the
transformer.
• Do not unload using a forklift. Keep
unnecessary personnel clear while
unloading and moving the transformer.
