5335 1 GH when applying gaskets. Put the gasket in place
and bolt the two surfaces together under uniform pres
sure . After the unit has been in service for a period of
six months, retighten all the bolts.
8.8
Finish
Instructions for refinishing transformer are as follows:
1 . If the paint on the unit is generally firm and sound,
it is not advisable to strip the entire surface.
2 . All rusted areas should be thoroughly wire-brushed,
sanded, etc., to remove all rust, loose paint, etc.
CAUTION
Eye protection should be worn to prevent inj
u
ry from
flying paint and rust chips.
3 . Thoroughly wipe down with solvent-soaked rags to
remove all dirt, oil, abrading dust, etc. Sometimes it is
advisable to give the unit a light blasting using sand ,
ground corn cob or ground walnut shell to roughen up
the surface.
4. Apply by brush method a coat of fast-dry primer
3 2230DU to all areas abraded to base metal: then fol
low with a complete spray coat of the fast-dry primer.
The method of paint applying (spray or brush) is not
critical.
5 .
Allow to air dry overnight or apply moderate heat of
65°C to 75°C for several hours.
6. After the primer coat is thoroughly dried, apply a
heavy, uniform spray coat of air dry enamel in the de
sired finish color.
7. Allow to air dry for at least 24 hours before placing
the transformer back in service. Moderate heat of 65°
to 75°C for several hours is preferable if available .
8 . Should extra protection be desired, then a second coat
of the finish enamel can be applied.
8.9
Additional Maintenance Instructions
The following are additional instructions that may be use
ful in maintaining the Substation Transformer. These
3 1
leaflets may be obtained through the nearest Westing
house Sales Office.
Removing and Replacing Welded-On
Covers . . . . . . . . . . . . . . . . . . . . . . . I.L. 47-600-2 1
Instructions for Repairing Tank Leaks. . . l.L. 48-069-20
Cleaning Transformer Insulation. . . . . . . L L. 48-069- 1 3
9 .
REPAIR
9 . 1 I t is the responsibility of the owner to inspect , main
tain and keep the transformer in good repair.
9.2 Report all failures during the warrantee period to
your Westinghouse Sales Office. All warrantee repairs
must be made or approved by Westinghouse .
9.3 To assure proper operation, use only Westinghouse
approved replacement parts. Transformers used in ex
plosive atmosphere environments (Class 1, Division JI,
Group D) must have sealed alarm switches. If replace
ment is necessary, identical devices must be used to main
tain safe operation.
9.4 It is recommended the owner limit repairs to replac
ing broken parts unless the owner has a well trained repair
shop. Because many parts and accessories are peculiar
to transformers, it is usually less expensive to replace
broken parts then repair them.
9.5 ALWAYS DE-ENERGIZE THE TRANSFORMER
WHEN ANY REP AIRS ARE MADE.
9.6 The operation and construction of accessories is in
Section
5
of this book.
9. 7 A damaged oil thermometer or liquid level gauge
bezel can be replaced without breaking the transformer's
pressure seal. See paragraphs 5 .4 and 5.5. Fans can be re
placed if both the transformer and the fan power supply
are first de-energized.
9.8 Some devices can be replaced only after the trans
former has been de-energized and then de-pressurized .
These devices are the mechanical pressure relief device,
sudden pressure relay, vacuum pressure gauge, sealedaire
device, current transformer junction block and cover
mounted bushings. Before de-pressurizing or ventilating
the transformer, refer to "Ventilation of Tank" Section
8 .6 of this instruction book.
