3 2
To depressurize the transformer, slowly open the air
test valve until the vacuum-pressure gauge reads zero psi.
If the transformer does not have these items SLOWLY
loosen the filling connection until pressure is equalized.
9.9 Some internal accessories such as current transform
ers, bushings, or fuses that are under the insulating fluid
can be replaced without completely draining the tank. In
such cases, only that fluid necessary to expose the acces
sory should be drained. There may also be occasions when
complete draining of the transformer tank may be neces
sary. Before partially or completely draining fluid from
the transformer tank, refer to "Maintenance" Section 8.4
an d Part I "Receiving, Storing and Handling" of
I. B. 45-063- 1 00 Instructions of Wemco C and Wemco CI
Insulating Oils, or Instructions for Handling Silicone In
sulating Fluid LB. 45-063-1 02, or Instructions for Han
dling WEMCO "FR" Insulating Oil LB. 47-053 -l .
When working inside a transformer tank, extreme care
must be exercised to avoid dropping tools or other objects
into the core and coils or into the tank. Objects dropped
on the coils or left in the tank can cause a failure to the
transformer.
9 . 1 0 The core and coil assembly can be repaired or re
placed by Westinghouse personnel at either the factory or
at a Westinghouse Repair Plant. Contact the nearest West
inghouse Sales Office for more details.
9. 1 1 Tank leaks must be repaired immediately to prevent
serious damage to the transformer and danger to life . Re
quest Instruction Leaflet 48-069-20 for detailed instruc
tions on tank repair.
9.1 2 Paint repair procedure is in Section 8 .8 .
9 . 1 3 I f there are questions concerning repair procedures
that are not explained to your satisfaction , contact your
Westinghouse Sales Office and you will receive an answer.
A
Renewal Parts List listing authorized replacement
parts is available through the nearest Westinghouse Sales
Office.
