4
4.
STORAGE PRIOR TO ENERGIZING
4.1
Temporary Storage in Nitrogen Without Liquid
Transformers shipped in nitrogen can be stored for up
to three months before filling with liquid. To assure pro
tection of the insulation, a positive gas pressure must be
continuously maintained. The best method of accomplish
ing this is by the temporary installation of Inertaire®
equipment. The Westinghouse Electric Service Depart
ment can obtain upon request the necessary Inertaire®
equipment for proper storage. The Inertaire® equipment
must be installed and in operation within one week after
the transformer has been delivered.
For further information on storage in nitrogen, consult
the factory or obtain Instruction Leaflet 48-069-40.
4.2
Storage in Liquid
It is advisable to store the transformer completely assem
bled, as though it were energized, at its permanent loca
tion. In any case, the transformer should be placed on a
solid, level foundation.
It is recommended that the space above the liquid be
pressurized with dry air or dry nitrogen to two or three
psig. This will prevent moisture from being pulled into the
tank by a negative pressure. The transformer will then be
ready for service at any time providing: (a) it has received
the same inspection and maintenance as a transformer in
service. (These inspections are listed in Section 8. 1 ) and,
(b) all checks and inspections listed under "Preparation
for Energization", Section 6. 6 have been made.
4.3 Separate Storage of Unmounted Accessories
Bushings which have been removed for shipment are
shipped crated or boxed. Store the bushings in a clean,
dry place indoors in their shipping crates. 111e lower end
of the bushing is covered with a plastic bag to keep it
clean and dry. The plastic bags on Type FS and Type OS
bushings contain a bag of silica gel. If the bags are dam
aged, replace the bags and the silica gel before storing.
Type
0
bushings must be stored with the top end elevated
at an angle of at least 20° from the horizontal above the
bottom end.
A
check of oil height, and of power factor
and capacitance, should be made before putting an oil
filled condenser bushing into service after prolonged stor
age. Refer to Westinghouse Bushing Manual T.D. 33 -3 60
for instructions on how to make these bushing tests and
how to analyze the test results.
Store lightning arresters in a clean, dry place indoors
in their shipping crates.
CAUTION
The line terminal as�embly must not be used to lift an
arrester. The lifting forces can damage the insulation and
when installed may cause the arrester to fail violently and
may in turn cause the transformer to fail. There
will
be
danger to life and danger to property .
Store the detail box, containing details as shipped, in
doors and in a dry place. The box contains line terminals,
gaskets, internal bushing connectors, paint, gasket cement,
Sudden Pressure Relay, etc., as specified on the detail
packing list.
5. ACCESSORIES AND COMPONENTS
5. 1 This section of the Instruction Book describes the op
eration and use of the transformer's accessories and com
ponents.
5.2 When accessories have control wiring or are equipped
with alarm contacts, refer to the control wiring diagram
referenced on the main outline drawing for contact type
and terminal points.
!MPOR T ANT:
When checking circuits through these in
struments, it is necessary to follow Table I. An indicating
light type device is generally recognized as best for check
ing circuits through instruments containing micro-switches
of similar capacities.
Table
1
Alarm Switch Ratings
Non-Inductive
Voltage
Load-Amps.
1 25 A-C
10
250 A-C
5
1 25 D-C
0.5
250 D-C
0.25
*L/R equal to or less than . 026.
L
=
Inductance in henries.
R
=
Resistance in ohms.
5 .3 Transformer Nameplate
Inductive Load
Amps.*
1 0
5
0.05
0.025
A
nameplate is supplied on each transformer according to
ANSI
Standard C57.1 2.00, Section 9.4. The nameplate
