Inspection And Maintenance; Renewal Parts - GE AKR-30 Series Maintenance Manual

SECTION
1-lntroduction
These instructions provide the maintenance procedures
and describe the operation of the
size type AKA low voltage power circuit breakers listed in
Table 1 .
The proper use, care, and maintenance of these break­
ers is a prime safety consideration for the protection of
personnel, as well as a means of minimizing equipment
damage when faults occur. Persons who apply, use, and
service these breakers will acquire the knowledge they
need by gaining the information contained in these instruc­
tions.
1.1 INSPECTIO N AND MAINTENANCE
Breakers should be cared for under a systematic main­
tenance program. Taking each breaker out of service
periodically for inspection and maintenance is an excellent
means of establishing high service reliability. It is good
policy to have one or more spare breakers to install in place
of breakers requiring maintenance. Keeping a stock of
recommended renewal parts will insure that maintenance
work can be done quickly.
How frequently an individual breaker should be in­
spected will depend on the circumstances of its use. It
would be well to inspect any breaker at least once a year. If
it is frequently operated, operated under severe load condi­
tions, or mstalled in an area of high humidity or a dusty,
dirty atmosphere, inspections should be more often. In­
spections might be monthly under adverse conditions.
Always mspect the breaker after a short-circuit current
has been mterrupted.
SAFETY PRECAUTION
BEFORE
INSPECTING OR BEGINNING ANY
MAINTENANCE WORK ON THE BREAKER. IT
MUST BE DISCONNECTED FROM ALL VOLT·
AGE SOURCES. BOTH POWER AND CON·
TROL. AND BE IN THE ··oPEN' POSITION
4
800 thru 2000 amp frame
A basic inspection should consist of the following:
a. Visual Check - Look for dirt, grease or other forei
material on any breaker parts. Check insulating surfac
for conditions that could degrade insulating properties
(cracks, overheating, etc.). Also check for loose hardware
and components on the breaker and the compartment's
bottom, loose or damaged control wiring and similar prob­
lem areas.
b. Operation - Observe a few close-open operations
using the operating or maintenance handle. If a breaker is
seldom operated such that it remains open or closed for a
period of six months or more, it is recommended that ar­
rangements be made to open and close it several times in
succession.
c. Interlocks- During the Operational check verify the
safety interlocks are properly working.
d. Arc Chutes and Contacts - Inspect the condition of
the arc chutes and contacts. Look for excessive burning or
breakage. Check the amount of contact depression or
wipe.
e. Accessories- Verify that the various accessories are
working properly.
f. The performance of the solid-state current trip devices
may be checked with a suitable test set. Check elec­
tromechanical devices for positive trip in accordance with
the instructions in their Maintenance Manual, GEl
1 .2

RENEWAL PARTS

The AKA breakers contain a variety of parts and as­
semblies. Many of these are available as replacement
parts when the need arises. See publication GEF
Renewal Parts, for a complete listing of these parts.
' -
86157.
4527,