Allis-Chalmers MA-150, Инструкция

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PART ARC CHUTE ASSEMBLY
5. I ARC CHUTE ASSEMBLY (Fig. 2
&
3)
Each arc chute consists of a flame retardent envelope which provides
phase isolation for interruption and venting of the by-product gases
of interruption. The arc chute contains:
a) The transfer stack consisting of refractory plates. It aids
the transfer of the arc terminal from the stationary end arcing
contact (3-9) to the stationary end runner (2-4) .
b) The stationary end arc runner (2-4) and moving end arc runner
{2-3) to which the arc terminals transfer from the arcing contacts.
The arc runners form paths for the arc terminals to travel up the
arc chute.
c) The stationary end blowout coil (2- 15) and moving end blowout coi I
(2- 13) which connect their respective arc runners to the top and
bottom bushings. The current in these coils creates the magnetic
flux which passes through cores (2- 18) , pole pieces (2-22) and
the space between the pole pieces. The action of this· flux on the
arc forces the arc up the barrier stack.
d) The barrier stack (2-23) consisting of a number of refractory
pi ates with ''Vee Shaped" s
I
ots cemented together. The barrier
stack cools, squeezes and stretches the arc to force a quick
interruption.
e) The barrier (2- 1) containing coolers (2-28) through which the
by-product gases of interruption pass. The barrier completes
the cooling and deionizing of the arc products.
Arc chutes are normally tilted (see Section 5.3) to expose contact area
of the breaker and/or to replace parts such as barrier stacks (2-23) .
The arc chutes may also be removed from breaker if necessary, to
replace parts not exposed when tilted by removing fastenings per Section
5.3.
PHASE BARRIERS (Fig.
I)
Full size barriers of high dielectric flame retardent material isolate
each phase.
To remove phase barriers on 5 kv breakers - lift panel spring assembly
( 1- 13) out of slots (J- 14) to release panel ( 1-32) . Lift and remove
panel. Remove center phase screw ( 1-23) . The phase barrier assemblies
( 1-5) and ( 1-7) can now be lifted and removed from the breaker. Note:
On MA 250/350B breakers remove screw ( 1-2) and remove barrier ( 1-25)
prior to above instructions.
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