GE AM-4.16-250-9 - Component Servicing

!
GEK
-
41902
Magne
-
blast
Circuit
Breaker
Interrupter
Removal
and
Replacement
between
inspection
periods
should
be
wiped
off
,
and
if
dampness
is
apparent
,
heaters
should
be
installed
in
the
metal
clad
switchgear
to
insure
dryness
.
Insulation
Test
Refer
to
Figure
16
.
To
remove
the
interrupter
loosen
the
two
upper
supporting
bolts
(
2
)
and
the
one
lower
support
bolt
(
9
)
using
a
standard
3
/
4
"
wrench
.
Raise
the
assembly
approximately
3
/
8
"
and
slide
it
toward
the
rear
of
the
breaker
.
To
reassemble
the
interrupter
to
the
breaker
,
rest
the
lower
interrupter
support
(
10
)
on
the
support
bracket
(
8
)
.
Slide
the
arc
chute
forward
lifting
it
slightly
to
engage
the
supporting
bolts
(
2
)
in
the
slots
of
the
upper
interrupter
support
(
3
)
.
Check
to
assure
that
the
upper
insulation
is
prop
-
erly
positioned
within
the
barrier
suspended
from
the
stationary
contact
support
(
9
)
Figure
23
.
Tighten
the
supporting
bolts
(
2
and
9
)
Figure
These
bolts
serve
as
both
the
electrical
and
mechanical
connections
between
the
bushings
and
the
arc
runners
within
the
interrupter
.
Check
that
the
movable
arcing
contact
(
5
)
passes
between
the
probes
on
the
upper
arc
runner
(
5
)
Figure
19
without
touching
.
Breaker
Contacts
!
I
:
When
insulation
has
been
repaired
or
replaced
,
or
when
breaker
has
been
operating
in
adverse
moisture
conditions
,
it
is
recommended
that
the
insulation
be
checked
before
the
breaker
is
placed
back
in
service
.
A
standard
60
hertz
high
poten
-
tial
test
at
14
,
000
volts
RMS
for
one
minute
will
normally
indicate
whether
the
breaker
is
satis
-
factory
for
service
.
With
the
breaker
contacts
in
the
fully
opened
position
,
apply
the
test
potential
to
each
terminal
of
the
breaker
individually
with
all
other
terminals
and
the
breaker
frame
grounded
.
After
high
potential
tests
are
made
on
organic
in
-
sulating
materials
,
these
materials
should
be
inspected
for
visible
leakage
current
paths
,
and
necessary
action
must
be
taken
to
repair
or
replace
insulation
that
may
have
been
affected
by
moisture
absorption
.
If
the
breaker
secondary
wiring
is
to
be
given
a
high
-
potential
test
at
1500
volts
,
remove
both
of
the
motor
leads
from
the
terminal
board
.
Failure
to
disconnect
the
motor
from
the
circuit
may
cause
damage
to
the
winding
insulation
.
Lubrication
i
i
!
:
\
16
.
By
removing
the
box
barrier
the
movable
and
stationary
primary
contacts
and
the
movable
arcing
contacts
can
be
inspected
.
The
stationary
arcing
contacts
can
be
inspected
only
after
removing
the
interrupter
.
If
the
contacts
are
burned
or
pitted
,
they
can
be
made
smooth
with
a
fine
file
.
After
completing
inspection
of
the
contacts
,
check
the
contact
adjustments
as
specified
under
ADJUSTMENTS
.
In
order
to
maintain
reliable
operation
,
it
is
important
that
all
circuit
breakers
be
properly
lubricated
at
all
times
.
Most
of
the
bearings
and
rolling
surfaces
utilize
a
new
type
of
dry
lubrication
that
will
require
no
maintenance
and
will
last
the
life
of
the
equipment
.
Only
few
bearings
and
sur
-
faces
listed
in
the
chart
,
Figure
17
,
require
lubrication
.
These
have
been
properly
lubricated
during
assembly
at
the
factory
,
using
the
finest
grades
of
lubricants
available
.
However
,
even
the
finest
oils
and
greases
have
a
tendency
to
oxidize
with
age
,
as
evidence
by
hardening
and
darkening
in
color
.
Elimination
of
the
hardened
lubricant
is
essential
for
the
proper
operation
of
circuit
breakers
.
Also
frequent
operation
of
the
breaker
causes
the
lubricant
to
be
forced
out
from
between
the
bearing
surfaces
.
A
simple
lubrication
will
often
clear
up
minor
disturbances
which
might
be
mistaken
for
more
serious
trouble
.
Mechanism
A
careful
inspection
should
be
made
to
check
for
loose
nuts
or
bolts
and
broken
retaining
rings
.
All
cam
,
roller
,
and
latch
surfaces
should
be
inspected
for
any
evidence
of
damage
or
excessive
wear
.
Lubricate
the
mechanism
as
outlined
below
,
then
,
using
the
manual
charging
wrench
,
open
and
close
the
breaker
several
times
to
make
certain
that
the
mechanism
operates
freely
throughout
its
entire
stroke
.
Check
the
mechanism
adjustments
as
specified
under
ADJUSTMENTS
,
control
wiring
for
tightness
of
connections
and
damaged
insulation
.
Bushings
and
Insulation
Check
the
A
definite
lubrication
schedule
should
be
set
up
taking
into
consideration
the
frequency
of
operation
of
the
breaker
and
local
conditions
.
The
surface
of
the
bushings
should
be
kept
clean
and
unmarred
to
prevent
moisture
absorption
.
If
the
insulation
surface
should
become
damaged
,
it
should
be
sanded
and
cleaned
,
and
should
be
refinished
with
either
clear
varnish
or
clear
resin
.
Allow
to
dry
smooth
and
hard
.
All
other
insulation
parts
on
the
breaker
should
be
kept
clean
and
dry
.
Smoke
or
dust
collected
It
is
recommended
that
lubrication
of
the
breaker
and
its
operating
mechanism
be
a
part
of
the
per
-
iodic
inspection
and
maintenance
program
,
with
not
more
than
a
two
year
period
between
lubrications
.
It
is
also
recommended
that
all
circuit
breakers
be
operated
at
regular
intervals
,
at
least
once
a
year
,
to
insure
the
lubrication
is
in
good
condition
and
the
breaker
is
operable
.
m
r
:
a
i
;
16
1
|
i
1
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