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40
Maintenance
PowlVac
®
STD Vacuum Circuit Breaker
IB-60201
Because of extensive quality control tests
made at the factory, the operations counter
on a new circuit breaker will normally
register over one hundred operations. The
reading of the operations counter should
be recorded when the circuit breaker
is placed into service and when any
maintenance work is performed.
2) Inspection and Cleaning
When cleaning the circuit breaker insulating
supports and bus insulation, use only
denatured alcohol or isopropyl alcohol to
remove foreign material. Failure to do so may
damage the dielectric and/or the mechanical
properties of the insulation.
CAUTION
CAUTION
!
Visually check the circuit breaker for loose
or damaged parts. Tighten or replace
loose or missing hardware. Any damaged
parts that will interfere with the normal
operation of the circuit breaker should be
replaced. This inspection will be much
easier if the front cover and interphase
barrier assembly are removed.
Clean the circuit breaker by removing any
loose dust and dirt. Do not use compressed
air to clean the circuit breaker. This may
result in loose dirt or grit being blown
into bearings or other critical parts, thus
causing excessive wear. Use a vacuum
cleaner, or wipe with a dry lint-free cloth or
an industrial-type wiper to clean the circuit
breaker. Do not use solvents, de-greasers,
or any aerosol products to clean in the area
of any mechanisms. Refer to
Ch 5 Maintenance,
B. M
echAnISM
A
reA
,
2) L
ubrication
for instructions on cleaning
the lubricated areas for the stored energy
mechanism and other specified parts.
Primary insulation, including the vacuum
interrupter supports and the operating
pushrods, should be cleaned. Wipe clean
with a dry lint-free cloth or an industrial
type wiper. If dirt adheres and cannot be
removed by wiping, remove it with a mild
solvent such as denatured alcohol. Be
sure that the circuit breaker is dry before
returning it to service. Do not use any
type of detergent to wash the surface of
the insulators as detergent may leave an
electrically conducting residue on the
surface as it dries.
B. M
echAnISM
A
reA
1) Mechanical Operation
Remove the circuit breaker front cover
to expose the stored energy mechanism.
Make a careful visual inspection of the
mechanism for loose, damaged, or
excessively worn parts.
Note:
If timing tests are performed as in,
Ch 5 Maintenance,
d. o
ptIonAl
M
AIntenAnce
p
rocedureS
, do not
operate the circuit breaker until these
tests are completed. Operation of the
mechanism may alter the “As found”
operating condition of the circuit
breaker stored energy mechanism.
For further details, see
Ch 4 Installation,
d. p
lAcInG
the
c
IrcuIt
B
reAker
I
nto
S
ervIce
,
4) Mechanical Operation Check.
