GE POWER/VAC GEK 86132A - Page 12

and
the
ground
lead
to
the
lower
stud
.
If
the
machine
has
a
center
point
ground
,
the
connections
may
be
made
either
way
.
Apply
36
K
V
(
rms
)
60
Hz
or
50
KV
DC
and
hold
five
(
5
)
to ten
(
10
)
seconds
.
If
no
breakdown
occurs
,
the
interrupter
is
in
acceptable
condition
.
If
a
breakdown
occurs
,
the
interrupter
should
be
replaced
.
No
attempt
should
be
made
to
try
to
compare
the
condition
of
one
vacuum
interrupter
with
another
nor
to
correlate
the
condition
of
any
interrupter
to
low
values
of
D
-
C
leakage
current
.
There
is
no
significant
correlation
.
After
the
high
potential
voltage
is
removed
,
discharge
any
electrical
charge
that
may
be
retained
.
To
measure
the
breaker
secondary
circuit
insulation
resis
-
tance
,
disconnect
the
motor
leads
and
thread
necting
together
all
secondary
disconnect
pins
except
#
24
the
ground
pin
.
The
measurement
is
made
by
connecting
a
500
V
megohmeter
from
the
wire
to
ground
.
10
.
INTERLOCK
FUNCTIONAL
CHECK
Verify
that
spacing
between
the
lower inside
edges
of
the
breaker
roller track
in
the
metalclad
compartment
is
29.807
”
min
.
to
29
,
857
”
max
.
Check
that
the
breaker is
OPEN
and
that
the
closing spring
is
DISCHARGED
.
Install
the
POWER
/
VAC
*
circuit breaker into the
DISCONNECT
/
TEST
posi
-
tion
in
the
metalclad
compartment
.
CAUTION
IF
THE
COMPARTMENT SECONDARY
CONTROL
CIRCUITS
ARE
ENERGIZED
,
THE
FOLLOWING
PROCEDURE
MUST
BE
FOLLOWED TO
PREVENT
ARCING
AND
BURNING
OF
THE
MOTOR
CIRCUIT
PINS
IN
THE
SECONDARY
CONTACT
BLOCKS
.
Either
charge
the
closing
spring
MANUALLY
,
or
push
in
and hold the
manual
CLOSE
button
to
open
the
motor
circuit
,
then
pull
down
the
handle and extend
the
breaker
secondary
control
contact
block
to
FIRMLY
engage
with
its
mating
secondary
control
contact
block
in
the
compartment
.
Release
CLOSE
button
to
activate
spring charging
motor
.
If
control
power
is
available
,
close
the
circuit
breaker
using
the control
switch
on
the
compartment
door
.
This
operation
will
check the
adjustment
of
the
52
/
LCS
switch
.
If
the breaker
will
not
close
electrically
.
,
recheck the
52
/
LCS
adjustment
.
If
control
power
is
not
available
push
the manual close button
and
recharge
the
closing spring manually
.
Spring
charging
will
occur
automatically
if
control
power
is
connected
.
With
the breaker
in
the
CLOSED
condition
,
attempt
to
install
the
racking
crank
.
The
racking
crank should be
blocked
by
the
POSITIVE
INTERLOCK
.
Trip
the
breaker
and
install
the
racking
crank
and
rack the
breaker
toward
the
connected
position
five
(
5
) complete
turns
.
During
the
five
turns
,
usually
between
the
third and fourth
turns
,
the
spring
discharge
interlock
will
discharge
the
closing
spring
.
The
contacts
of
the
circuit breaker should
remain
open
.
If
adjustment
is
required
see
INTRODUCTION
,
SPECIFIC
,
par
.
6
.
and
MECHANICAL
ADJUSTMENTS
sections
16.7
and
16.8
.
Rack
the
breaker
into the
CONNECTED
position
and
charge
the
closing spring
.
If
secondary
control
power
i
$
available
the
closing
spring
will
charge
automatically
.
Assure
that
the
breaker
is
in
the
OPEN
condition
.
Rack
the
breaker
toward the
TEST
/
DISCONNECT
posi
-
.
tion
three
(
3
) complete
turns
.
During
the
three
turns
,
the
spring
discharge
interlock
should
discharge
the
closing
spring
and
the
breaker
contacts
should
remain
OPEN
,
If
adjustment
is
required
see
INTRODUCTION
,
SPECIFIC
,
par
.
6
.
a
wire
con
-
04
UTION
:
MANY
D
-
C
HIGH
POTENTIAL
MACHINES
ARE
HALFWAVE
RECTIFIERS
.
THIS
TYPE
OF
HI
-
POT
TESTER
MUST
NOT
BE
USED
TO TEST
VACUUM
INTERRUPTERS
.
THE
CAPACITANCE
OF
THE
POW
-
ER
/
VAC
*
BOTTLES
IS
VERY
LOW
AND
THE
LEAK
-
AGE
IN
THE
RECTIFIER
AND
ITS
D
-
C VOLTAGE
MEASURING
EQUIPMENT
IS
SUCH
THAT
THE
PULSE
FROM
THE
HALFWAVE
RECTIFIER
MAY
BE
IN
THE
^
'
NEIGHBORHOOD
OF
120
kv
WHEN
THE
METER
IS
d b
>
ACTUALLY
READING
40
kv
.
IN
THIS
CASE
,
SOME
PERFECTLY
GOOD
BOTTLES
CAN
SHOW
A
RELA
-
TIVELY
HIGH
LEAKAGE
CURRENT
SINCE
IT
IS
THE
PEAK
VOLTAGE OF
120
kv
THAT
IS
PRODUCING
ERRONEOUS
BOTTLE
LEAKAGE
CURRENT
.
IN
AD
-
DITION
,
ABNORMAL
X
-
RADIATION
WILL
BE
PRO
-
DUCED
.
•
i
An
acceptable
high
potential
machine
is
available
from
:
Medium
Voltage
Switchgear
Operations
,
Burlington
,
Iowa
,
Catalog
Number
282
A
2610
P
001
.
The
following
machines
are
also
acceptable
.
Hipotronics
Hipotronics
Hipotronics
James
G
.
Biddle
Model
860
PL
Model
880
PL
Model
7
BT
60
A
Catalog
222060
9.5
.
INSULATION
TESTS
Since
definite limits
cannot
be
given
for
satisfactory
insulation
values
,
a
record should
be
kept
of
the
megohmeter
readings
as
well
as
temperature
and
humidity
readings
.
This
record
should
be
used
to
detect
any
weakening
of
the
insulation
from
one
check
period
to
the
next
.
Generally
readings
should
equal
or
exceed
10
,
000
megohms
.
The
primary
circuit insulation
on
the
breaker
may
be
checked
phase
to
phase
and
phase
to
ground
using
a
2500
V
or
other
suitable
megohmeter
.
8
Courtesy of NationalSwitchgear.com