GE Magne-Blast AM-13.8-1000-3H - Breaker Adjustments

GEI
-
88766
in
the
opening
springs
is
thus
released
,
,
opening
the
breaker
.
During
this
operation
*
the
trip
coil
circuit
is
deenergized
*
and
upon
comple
-
tion
of
the
opening
operation
,
the
operating
mechanism
is
returned
to
its
normal
position
*
ready
for
closing
.
As
the
breaker
opens
,
the
main
contacts
part
first
*
shunting
the
current
through
the
arcing
contacts
.
An
arc
forms
as
the
arcing
contacts
part
See
Fig
.
7
.
As
the
movable
arcing
nontact
(
7
)
is
moved
away
from
,
the
stationary
contact
*
the
upper
end
of
the
arc
is
transferred
to
the
upper
arc
runner
(
4
)
.
To
assist
the
interruption
at
this
point
,
a
stream
of
air
is
emitted
from
the
booster
tube
(
25
)
and
forces
the
arc
onto
the
lower
arc
runner
(
8
)
tically
inserts
the
blowout
coils
into
the
circuit
*
introducing
a
mag
-
netic
field
between
the
pole
pieces
which
tends
to
draw
the
arc
away
from
the
arcing
contacts
coils
and
three
lower
blowout
coils
each
individually
connected
in
ser
-
ies
with
its
respective
section
of
arc
runner
.
As
the
arc
is
forced
outward
along
the
diverging
arc
runners
*
the
magnetic
field
is
progress
-
ively
increased
with
the
addition
of
each
coil
in
the
circuit
.
At
the
same
time
*
the
arc
is
being
forced
into
the
arc
chute
(
3
)
which
is
composed
of
a
series
of
gradually
interleaving
insulating
fins
.
These
fins
*
which
project
alternately
from
the
two
opposite
inner
sur
-
faces
of
the
chute
*
elongate
the
arc
into
a
gradually
deepening
serpen
-
tine
path
*
so
that
the
electrical
resistance
in
the
path
of
the
arc
is
rapidly
increased
and
the
heat
from
the
arc
is
absorbed
resistance
reduces
both
the
magnitude
and
the
phase
angle
of
the
current
*
|
g
and
at
an
easily
current
-
zero
the
arc
path
is
so
long
and
the
gases
pro
-
duced
by
the
arc
so
cooled
that
the
arc
cannot
reestablish
itself
and
,
interruption
occurs
.
Manual
tripping
follows
the
same
procedure
except
that
instead
of
ener
-
gizing
the
trip
circuit
,
the
manual
trip
(
ll
)
Fig
.
2
is
used
.
i
Establishment
of
the
arc
on
the
runners
automa
-
The
interrupter
contains
three
upper
blowout
The
increased
Trip
Free
Operation
If
the
trip
coil
circuit
is
energized
while
the
breaker
is
closing
,
the
trip
plunger
will
force
the
trip
latch
(
8
)
Fig
.
5
away
from
the
trip
roller
(
9
)
causing
the
mechanism
linkage
to
collapse
and
the
breaker
to
The
closing
cam
(
16
)
will
complete
its
closing
stroke
and
the
re
-
open
springs
will
re
-
charge
as
in
a
normal
closing
operation
.
i
ADJUSTMENTS
All
adjustments
should
be
checked
during
periodic
inspections
and
when
-
ever
it
becomes
necessary
to
repair
or
replace
parts
that
have
become
worn
or
defective
while
in
service
.
The
following
adjustments
are
list
-
ed
in
the
order
in
which
they
are
to
be
checked
.
First
*
however
*
remove
the
breaker
from
the
metal
-
clad
unit
and
remove
the
rear
*
side
*
and
in
-
terphase
barriers
and
front
cover
.
m
£
o
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