GE Limitamp CR194 - Vacuum Interrupter Integrity Testing; Integrity Test General Information; Vacuum Interrupter Integrity Test Procedure

CR
194
Vacuum
Limitamp
400
Ampere
Control
TOP
NOTE
1
.
Adjust
depressor
bracket
(
s
)
by
bending
to
depress
Interlock
plungers
equally
with
handle
In
OFF
position
.
2
.
Loosen
screws
“
A
”
,
depress
Interlock
plungers
(
2
or
3
)
all
the
way
,
then
move
depressor
back
0.04
to
0.06
Inch
for
slack
and
tighten
screws
.
VIEW
DEPRESSOR
(
2
)
r
+
1
N
.
O
.
1
N
.
C
.
TPI
SWITCHES
L
SIDE
VIEW
2
TO
HANDLE
h
-
z
X
o
GC
MAIN
DISCONNECT
ROD
ASSEMBLY
u
.
Figure
58
.
Checking
test
power
Interlock
(
TPI
)
adjustments
.
Checking
Procedures
-
Mechanical
Interlock
&
Manual
Isolator
(
See
Figures
56
-
58
)
1
.
Check
the
door
mechanical
interlock
for
proper
interference
.
See
Figure
56
.
2
.
Check
for
proper
operation
of
pusher
rod
and
Control
Power
Interlock
(
CPI
)
operation
.
See
Figure
57
.
3
.
Check
the
Test
Power
Interlock
(
TPI
)
adjustment
.
See
Figure
58
.
Warning
:
The
vacuum
interrupter
integrity
test
should
be
per
-
formed
before
the
high
-
voltage
contactor
is
energized
for
the
first
time
and
each
time
it
is
returned
to
service
after
maintenance
,
adjustment
,
or
repair
(
See
GEH
-
5306
)
.
Otherwise
the
vacuum
interrupter
'
integrity
test
should
be
performed
annually
.
Caution
should
be
exercised
during
this
test
since
high
voltage
testing
is
potentially
hazardous
.
First
open
the
controller
isolating
switch
then
completely
isolate
the
contactor
by
discon
-
necting
the
bolted
connections
at
the
contactor
load
terminals
prior
to
performing
the
high
potential
test
.
Also
remove
CPT
primary
fuses
,
Failure
to
perform
these
tests
may
cause
serious
injury
or
death
.
High
potential
test
instruments
can
be
purchased
to
perform
the
vacuum
interrupter
integrity
test
.
The
following
is
a
recommended
test
instrument
:
Hipotronics
Model
7
BT
60
A
Use
of
a
DC
Hipot
is
not
recommended
because
results
may
indicate
a
problem
with
a
good
interrupter
.
If
you
wish
to
use
DC
Hipot
,
set
for
28
kV
,
but
if
interrupter
fails
,
confirm
failed
interrupter
using
above
AC
Hipot
.
Vacuum
Interrupter
Integrity
Test
Warning
:
The
controller
isolation
switch
(
QMQB
)
must
be
placed
in
the
off
position
and
the
motor
load
must
have
come
to
a
complete
stop
before
attempting
to
perform
the
vacuum
inter
-
rupter
'
integrity
test
.
Caution
:
X
-
ray
em
ission
may
be
produced
if
an
abnormally
high
voltage
is
applied
across
the
open
contacts
of
a
vacuum
in
-
terrupter
.
Do
not
apply
a
voltage
across
the
400
A
CR
193
B
con
-
tactor
that
is
higher
than
20.0
h
V
RMS
.
Test
Procedure
Note
:
Before
performing
vacuum
integrity
test
,
confirm
that
both
the
armature
gap
setting
and
contact
wear
adjustment
(
GEH
-
5306
,
Sections
5
&
6
)
are
proper
.
1
.
Disconnect
load
side
power
leads
from
contactor
and
CPT
primary
fuses
.
2
.
With
the
contactor
in
the
open
position
connect
the
test
leads
to
the
contactor
power
terminals
as
shown
in
Figure
59
.
Apply
the
recommended
test
voltage
(
per
above
)
and
hold
for
a
minimum
of
five
(
5
)
seconds
.
General
This
test
determines
the
internal
dielectric
condition
and
vacuum
integrity
of
the
vacuum
interrupters
.
Prior
to
performing
this
test
the
outside
surfaces
of
the
vacuum
interrupters
should
be
wiped
clean
of
any
contaminants
with
a
non
-
linting
cloth
or
industrial
type
wiper
.
During
this
test
each
interrupter
should
be
checked
separately
.
31
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