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9. m a I N Ta I N I N G T h e s w I TC h G e a r
Breakers
Test for proper operation
Test and inspect all circuit breakers for proper
operation as follows:
1. Operate each breaker while in the TEST position
and check all functions. This is particularly
important for breakers that normally remain in
either the opened or closed positions for long
periods of time.
Warning: Primary equipment must be completely
de-energized while tests on control circuits, etc.
are being conducted. Be sure that all areas of
feedback from secondary circuits, as well as
outside sources, are disconnected.
Avertissement: L'équipement principal doit être
entièrement coupé de la source d'alimentation
principale lorsque des tests sont réalisés sur les
circuits de commande, etc. Assurez-vous que
toutes les zones de retour de tension des circuits
secondaires, ainsi que les sources extérieures, sont
déconnectées.
2. Remove the breakers from their
compartments to a clean maintenance area.
Close compartment door and cover the breaker
cutout to prevent access to live parts.
Warning: De-energize equipment completely
before doing maintenance work on any devices,
connections, bus work, breaker or feeder cable
compartments. This includes de-energizing any
connections to outside primary or secondary
sources, such as transformers, tie lines, etc.
Avertissement: Coupez l'alimentation principale
de l'équipement avant d'effectuer des opérations
d'entretien sur les dispositifs, les connexions, le jeu
de barres ou les compartiments des disjoncteurs
ou des câbles d'alimentation. Cela inclut également
la coupure de toutes les connexions vers des
sources principales ou secondaires extérieures,
telles que des transformateurs, lignes
d'interconnexion, etc.
Checks after breaker is de-energized
At the time of inspection, the following checks
should be made after the breaker has been
de-energized.
1. Manually operate the breaker several times,
checking for obstructions or excessive friction.
Manual closing of an electrically operated breaker
may be performed by the following two steps:
a. To charge the mechanism springs, pull the
operating handle down until it stops (about
90°) ten times for the EntelliGuard breaker.
The charge indicator will show CHARGED
on a yellow background.
b. Depress the CLOSE button on the front of the
breaker. The springs should discharge and,
if the latch is properly reset, the breaker
will close.
2. Electrically operate the breaker several times to
check performance of the electrical accessories.
3. Visually check the breaker for loose hardware on
the breaker; also, check the bottom of the
compartment for any hardware that has fallen
from the breaker.
4. Remove and inspect the arc quenchers and
contacts for breakage or excessive burning.
5. The performance of the solid-state current trip
devices may be checked with a suitable test set.
Check electro-mechanical devices for positive
trip in accordance with the instructions in the
proper Maintenance Manual.
6. Check insulating parts for evidence of
overheating and for cracks that indicate
excessive thermal aging.
Refer to circuit breaker instruction manuals for
detailed maintenance instructions and information
for replacement of parts. See DEH- 41304 (AKD-20
Only) or DEH-41526 (Entellisys Only).
