GE POWER/VAC GEK 86132A - Page 13

11
.
MAINTENANCE
Salt
spray
Changes
in
temperature
that
produce
condensation
Conductive
and
/
or
abrasive
dust
Damaging
chemicals
and
fumes
Vibration
or
mechanical
shock
High
relative
humidity
(
90
%
)
Temperature
extremes
(
below
-
30
°
C
or
above
40
°
C
)
BEFORE
ANY
MAINTENANCE
WORK
IS
PERFORM
-
ED
,
MAKE
CERTAIN
THAT
ALL
CONTROL
CIRCUITS
ARE
DE
-
ENERGIZED
AND
THAT
THE
BREAK
-
ER
IS
REMOVED
FROM
THE
METALCLAD
UNIT
.
DO
NOT
WORK
ON
THE
BREAKER
OR
MECHANISM
WHILE
IT
IS
IN
THE
CLOSED
POSITION
WITHOUT
TAKING
PRECAUTIONS
TO
PREVENT
ACCIDENTAL
TRIPPING
.
DO
NOT
WORK
ON
THE
BREAKER
WHILE
THE
CLOSING
SPRING
IS
CHARGED
UNLESS
IT
IS
SECURED
IN
THAT
POSITION
BY
THE
CLOSING
SPRING
GAG
.
*
1
11.1
.
GENERAL
POWER
/
VAC
*
circuit
breakers
have
been
designed
to
be
as
maintenance
-
free
as
practicable
.
They
include
features
such
as
sealed
vacuum
interrupters
and
long
-
life
synthetic
greases
which
contribute
to
many
years
of
trouble
-
free
performance
with
a
minimum
amount
of
maintenance
.
POWER
/
VAC
*
INTERRUPTER
The
POWER
/
VAC
*
interrupter
used
in
this
breaker
is
a
reliable
,
clean
interrupting
element
.
Since
the
contacts
are
contained
in
a
vacuum
chamber
,
they
remain
clean
and
require
no
maintenance
at
any
time
,
The
metallic
vapors
eroded
from
the
contact
surfaces
during
high
current
inter
-
ruption
remain
in
the
chamber
and
are
deposited
on
metal
shields
thus
insuring
a
high
dielectric
value
of
the
vacuum
and
the
walls
of
the
interrupter
.
i
.
-
•
*
5
^
-
4
*
•
r b
.
11.3
.
FAULT
INTERRUPTIONS
The
erosion
rate
of
the
primary
contacts
in
the
vacuum
interrupters
is
very
low
for
no
-
load
and
normal
load
switch
ing
operations
.
However
,
fault
current
interruptions
,
^
t
|
or
near
the
breaker
rating
may
result
in
appreciable
.
contact
erosion
.
With
frequent
fault
interruptions
it
is
necessarjijtp
perform
maintenance
based
on
the
number
of
interruptions
.
After
each
15
fault
interruptions
the
following
should
be
performed
:
1
.
Contact
erosion
check
.
2
.
Wipe
and
gap
check
.
3
.
Vacuum
interrupter
integrity
test
TROUBLE
REPORTING
Although
all
reputable
manufacturers
design
their
prod
-
ucts
to
perform
satisfactorily
with
a
minimum
of
problems
,
the
IEEE
Switchgear
Committee
,
an
organization
of
both
users
and
manufactures
,
recognized
the
need
for
a
common
trouble
reporting
format
.
A
reproducible
copy
of
this
form
is
included
inside
the
rear
cover
of
this
book
and
is
recom
-
mended
for
use
with
any
manufacturer
’
s
circuit
breakers
,
The
Intent
is
for
each
maintenance
organization
to
keep
specific
problem
files
with
this
information
documented
.
If
the
problem
is
serious
or
repetitive
,
a
summary
should
be
sent
to
the
appropriate
MANUFACTURER
for
action
,
The
level
of
detail
included
on
the
form
is
considered
very
desirable
so
that
the
manufacturer
’
s
investigator
may
more
thoroughly
understand
and
solve
the
reporled
problem
.
•
.
7
'
Cy
11.4
.
CONTACT
EROSION
Check
in
the
breaker
-
closed
position
per
PRIMARY
CONTACT
EROSION
section
8.1
.
When
erosion
reaches
1
/
8
inch
,
the
interrupter
should
be
replaced
.
Ip
•
JI
.
11.2
.
SERVICE
CONDITIONS
The
frequency
of
required
maintenance
depends
on
the
severity
of
the
service
conditions
of
the
switchgear
applica
-
tion
.
If
the
service
conditions
are
mild
,
the
interval
between
maintenance
operations
may
be
extended
to
10
years
or
10
,
000
no
load
or
normal
load
switching
operations
.
Mild
service
conditions
are
defined
as
an
environment
in
which
the
switchgear
is
protected
from
the
deleterious
effects
of
condi
-
tions
such
as
:
11.5
.
TRANSFER
FINGER
WEAR
With
the
breaker
open
,
examine
the
moving
contact
rod
projecting
below
the
transfer
fillers
(
10
,
Fig
.
8
)
.
Wipe
off
the
lubricant
in
order
to
see
the
metal
surface
condition
.
The
finger
locations
should
present
a
burnished
silver
contact
without
copper
appearance
at
more
than
one
location
,
If
copper
is
visible
at
more
than
one
location
per
pole
or
the
silver
plating
is
torn
,
the
interrupter
assembly
should
B
^
replaced
.
Relubricate
with
0282
A
2048
P
009
.
^
9
Courtesy of NationalSwitchgear.com