Westinghouse Type F-122 Oil Circuit-Breakers
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FIG, 5--0UTLINE DRAWING FOR TYPE
F-122
BREAKER WITH CoMMoN PIPE MouNTING
FOR UNIT AND CovERPLATE
signs of moisture, carbonization or
dirt, filter and retest it before re
placing it in service. See that the
oil level in the tanks is maintained
at the proper height.
7.
Remove all oil and thoroughly
clean the tanks, tank liners, lift
rods, terminal bushings, etc., at
least once a year.
8. Thoroughly inspect all bolts and
nuts-and tighten if necessary.
Inspect all pins, links and bearings
especially for excessive wear. Check
all cotter pins. Do not use thin
lock washers on moving contact
parts.
II.
Arrange for regular inspection to
see that the apparatus is in ad
justment, the oil is of good quality
and that the complete breaker
functions as required.
Regular
inspection periods pay dividends.
Insulating Oil
Dielectric tests of the oil should be
made every three months, to show if it
is reasonably good for circuit-breaker
work.
Samples should not be taken
until the oil has remained undisturbed
for at least four hours. In testing for
indication of water, take the sample from
the bottom of the tank. If for indica
tion of carbon, and after a heavy
short-circuit, take the sample from
the surface of the oil.
Care of Circuit-Breaker
Oil-The care
of the insulating oil in circuit-breakers
is of the utmost importance in their
successful operation. Contamination by
dirt, moisture, metallic particles, lint,
etc., all reduce the dielectric strength,
upon which the operation and current
interrupting ability largely depend.
Consequently, the most careful attention
should be given to keeping the oil clean,
6
not only in filling the tanks originally
but in later maintenance or other work
on the breakers which might involve
opening the tanks.
Only the highest grade, such as W emco
"C" or other approved oil should be used
in the breakers. The oil should be new
or at least thoroughly reconditioned by
means of a filter press or centrifuge. In
any case, before using, it should be given
a dielectric test which should show
a
minimum of 22,000 volts (preferably
25,000 to 30,000) measured between
l-inch diameter discs spaced .1 inch
apart.
Before filling, the tanks should be
thoroughly cleaned and flushed out
with insulating oil. The same treatment
should be given the inside of the top of
the breaker and the operating linkage
and contact system. In doing this, rags
which will leave lint should not be used
as this absorbs and holds moisture.
The same care should be used during
inspection or maintenance work on the
breaker, which should preferably be done
only under favorable weather conditions.
If the oil is to be reconditioned following
operation of the breaker under short
circuit, the tank, and entire inside of the
breaker should be cleaned before the oil
is returned to the tank. If the work
merely involves lowering or removal of
the tank, care should be taken to keep
the tank covered until it is replaced so
that dirt, dust metallic particles, etc.,
cannot fall into the oil.
The above precautions may appear
academic to those familiar with the
maintenance and operation of oil circuit
breakers, but a little more than ordinary
care in oil handling will be well repaid in
reliable and dependable operation for
which the breaker is designed and built.
For instructions as to the care and
testing of insulating oil, see Instruction
Book 44-820-1.
Mounting of Switchboard
Breaker (on Panel or
on Panel Bracket)
Before mounting the coverplate and
the breaker to the panel, first assemble
the signal switch and bell alarm, if they
are ordered, to the coverplate as shown
on Fig.
6.
Then place the 5-ampere
tripping coils from the overload attach
ment, if supplied, in the coil box of the
coverplate, and mount the coverplate
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