Receiving inspection – Howard Small Power User Manual

Page 4

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Document 2.4.54 Revision 0

July 2006

Small Power Substation Transformers



These instructions apply to substation transformers

manufactured by Howard Industries. It is important

to read the safety information on page 2 before

attempting any installation, operation, or maintenance


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 Substation Transformer

Division prior to unloading the transformer.

Drawings and Documents

Locate all shipping papers, packing lists, outline

drawings, and other pertinent information. Use these

documents and this manual during the inspection.

The transformer outline drawing indicates the locations

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

control, fan and alarm wiring.



External Inspection

The following external inspections should be made at a


1. Verify that all equipment, accessories, and

components listed on the bill of lading are


2. Ensure there are no signs of external damage.
3. Verify the paint finish has not been damaged.
4. Ensure that fittings, conduit, wiring, and other

attachments are tight and undamaged.

5. Check for evidence of fluid leakage on the

tank, valves, or cooling assemblies.

6. Check for damage to the bushings.
7. Check for damage to the shipping crates,

packages, or other materials shipped

separately from the transformer.

Tank Pressure

The tank vacuum/pressure gauge may indicate

positive or negative when the transformer is

received, depending on the relative fluid and ambient

temperatures. This indicates that the transformer

is sealed effectively. If the vacuum/pressure gauge

reads zero, this may indicate the possibility of a tank

leak; although, a zero reading can occur occasionally

with changing internal and external temperatures.

In the case of a zero reading, the tank should be

pressure tested according to the instructions on page

9 (Pre-energization Tests and Checklist). Report

any suspected tank leaks to the Howard Substation

Transformer Division.

Internal Inspection

An internal inspection of the transformer tank is

rarely necessary and is required only when there are

indications that the transformer has received severe

impact damage during transit. If an internal inspection

is necessary, follow the instructions on page 7 for

opening the transformer tank. Contact the Howard

Substation Transformer Division before proceeding with

any internal inspection.