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32
PowlVac® ASD 27kV & 38kV Vacuum Circuit Breaker
IB-65100
Maintenance
A permanent record of all maintenance
work should be kept, the degree of detail
depends upon the operating conditions.
The record will be a valuable reference for
subsequent maintenance work and for
station operation. It is also recommended
that the record include reports of tests
performed, the condition of circuit
breakers, and any repairs or adjustments
that were performed. This record should
begin with tests performed at the time of
installation and energizing, and all data
should be graphed as a function of time
to ensure a proper maintenance cycle is
scheduled.
Because of extensive quality control tests
made at the factory, the operations counter
on a new circuit breaker will normally
register over a 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.
CAUTION
CAUTION
!
When any maintenance procedures require
opening or closing of the circuit breaker or
charging of any of the mechanism springs,
exercise extreme care to make sure all
personnel, tools and other objects are kept
well away from all moving parts or charged
springs.
CAUTION
CAUTION
!
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 mechanism
properties of the insulation.
2) Inspection and Cleaning
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. The inspection will be easier if the
front cover is removed.
Clean the circuit breaker by removing any
loose dust and dirt. Do not use compressed
air to clean dirt from the circuit breaker.
This may result in blowing loose dirt or grit
into bearings or other critical parts, thus
causing excessive wear on these parts. To
clean the circuit breaker, remove dirt with
a vacuum cleaner, or wipe dirt away with
a dry, lint-free cloth or an industrial-type
wiper. 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) Lubrication
, 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
rods, should be cleaned. Wipe the
insulation clean with a dry, lint-free cloth
or an industrial type wiper. If dirt adheres
and cannot be removed by wiping, remove
it with distilled water or 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
because detergent may leave an electrically
conducting residue on the surface as it
dries.
