Siemens-Allis FC-10008, Инструкция по эксплуатации

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current values. This control causes the arc to make an
earlier transfer to the
arc
runners, thereby energizing the
magnetic circuit which drives the arc into the barrier stack.
This action produces a shorter arcing time than would be
possible by relying only on the thermal effects of the arc
to achieve the transfer to the arc runners.
The puffers are located within the breaker frame
directly below the stud and support assembly. The system
employs two bellows whose volume is swept by linkage
, driven platens during the breakers opening operation.
Pressurized air is distributed by a manifold and individual
nozzles to each breaker pole.
The air puffer system should be inspected during
regular maintenance periods. Hoses and nozzles should be
checked for tight connections, flexibility and freedom from
kinking or collapse. The platen and its linkqe should be
checked for freedom of movement and wear. The bellows
should be inspected for holes or obvious leakage.
-�------
The air output from the puffer nozzle may be checked
with the arc chutes tilted (refer
to
"Tilting Arc Chutes",
page 17 and Figure 2A). Crush a 4·1/2 x 4·1/2 1nch (115
x
115 mm) sheet of tissue paper, place it in the nozzle
opening and check to see that it is dislodged when the
breaker is opened.
10. Shock Absorbers
Shock absorbers (10, Figure 2) arrest and cushion the
opening motion of the radius arm and movable disconnect
blades. The dashpots
are
comprised of connecting rod,
piston, seals and cylinder.
The shock absorber should be inspected at regular
maintenance periods. Cylinders should be checked for
cleanliness and freedom from deposits which might retard
motion. The piston should be checked for free movement
within the cylinder. Seals are to be flexible and contact
Figure 22. Lubrication Point on Breaker
-35-
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