GE POWER/VAC GEK 86132A - Page 11

The
machine
should
be
connected
with
its
output
potential
at
zero
and
the
voltage
increased
to
the
test
voltage
and
that
voltage
maintained
for
60
seconds
.
The
voltage
should
then
be
returned
to
zero
and
the
hipot
machine
removed
from
the
circuit
,
Do
not
exceed
the
test
voltage
indicated
for
the
applicable
breaker
voltage
rating
.
;
;
9.2
.
2
,
SECONDARY
CIRCUIT
Prior
to
hipotting
the
breaker
secondary
circuit
,
disconnect
the
motor
leads
and
thread
a
wire
connecting
together
all
secondary
disconnect
pins
except
#
24
the
ground
pin
.
Con
?
nect
the
hipot
machine
from
this
wire
to
ground
,
Increase
the
voltage
to
1125
volts
(
rms
)
60
Hz
and
maintain
for
60
seconds
Reduce
the
voltage
to
zero
and
remove
the
hipot
machine
from
the
circuit
.
Remove
the
wire
connecting
the
secondary
disconnect
pins
and
reconnect
the
motor
leads
9
,
3
.
PRIMARY
CIRCUIT
RESISTANCE
I
9
,
ELECTRICAL
CHECKS
Electrical
checking
consists
of
electrical
breaker
operation
,
primary
and
secondary
wiring
high
-
potential
testing
(
if
re
-
quired
)
,
primary
circuit
resistance
(
if
required
)
,
POWER
/
VAC
*
interrupter
high
-
potential
testing
,
and
insulation
re
-
sistance
to
ground
.
9.1
.
ELECTRICAL
OPERATION
To
check
the
electrical
operation
,
attach
a
secondary
test
coupler
to
the
circuit
breaker
connector
.
Check
the
control
voltage
on
the
nameplate
and
close
and
open
the
breaker
a
couple
of
times
.
CAUTION
:
REPEATED
OPERATIONS
AT
A
RATE
EXCEEDING
TWO
PER
MINUTE
WILL
CAUSE
CHARG
-
ING
MOTOR
OVERHEATING
AND
FAILURE
.
I
’
A
resistance
check
of
the
primary
circuit
may
be
made
with
the
breaker
closed
.
Use
a
low
resistance
measuring
instfumelfit
which
measures
microhms
.
The
100
ampere
reading
should
be
25
to
50
microhms
for
a
2000
amp
.
breaker
and
,
30
to
60
microhms
for
a
1200
amp
.
breaker
when
connected
across
the
primary
bars
on
the
breaker
side
of
the
disconnect
fingers
Leave
the
circuit
breaker
in
an
open
and
spring
discharged
Condition
after
ohecks
are
complete
and
refer
to
metalclad
instruction
book
GEK
39672
before
inserting
the
circuit
breaker
into
a
metalclad
unit
,
Reinstall
the
front
cover
if
it
has
been
removed
.
t
"
9.4
.
VACUUM
INTERRUPTER
INTEGRITY
TEST
•
9.2
.
HIGH
-
POTENTIAL
TEST
If
high
potential
tests
to
check
the
integrity
of
the
insulation
are
required
,
the
A
-
C
high
potential
test
described
below
is
strongly
recommended
.
D
-
C
high
potential
testing
is
not
recommended
except
for
the
VACUUM
INTERRUPTER
INTEGRITY
TEST
.
The
following
procedure
must
be
ad
-
hered
to
,
,
CAUTION
:
IF
D
-
C
HIGH
POTENTIAL
TESTING
IS
REQUIRED
,
THE
D
-
C
HIGH
POTENTIAL
MACHINE
MUST
NOT
PRODUCE
PEAK
VOLTAGE
^
EXCEEDING
50
KV
.
1
-
V
CAUTION
X
-
RADIATION
WILL
BE
PRODUCED
IF
AN
ABNORMALLY
HIGH
VOLTAGE
IS
APPLIED
ACROSS
A
PAIR
OF
ELECTRODES
IN
A
VACUUM
.
X
-
RADIATION
WILL
INCREASE
AS
VOLTAGE
INC
CREASES
AND
/
OR
AS
CONTACT
SEPARATION
DE
CREASES
.
ONLY
TEST
A
CORRECTLY
ADT
0
STED
CIRCUIT
BREAKER
.
.
.
.
.
i
'
r
.
-
cS
/
fe
-
'
DURING
A
HIGH
POTENTIAL
OR
A
VACUUM
.
IN
TEGRITY
TEST
ANY
X
-
RADIATION
WHICH
MAY
BE
PRODUCED
WILL
NOT
BE
HAZARDOUS
AT
A
DIS
-
TANCE
SAFE
FOR
HIGH
POTENTIAL
TESTING
.
IF
THE
TEST
IS
CONDUCTED
AT
THE
RECOM
-
MENDED
VOLTAGE
AND
WITH
THE
NORMAL
OPEN
CIRCUIT
BREAKER
CONTACT
GAP
i
.
4
9.2
.
1
.
PRIMARY
CIRCUIT
The
breaker
should
be
hipotted
in
the
closed
breaker
mode
.
An
A
-
C
hipot
machine
capable
of
producing
the
test
voltages
shown
below
may
be
used
to
hipot
the
breaker
phase
to
phase
and
phase
to
ground
.
DO
NOT
APPLY
VOLTAGE
THAT
IS
HIGHER
THAN
THE
RECOMMENDED
VALUE
.
DO
NOT
USE
CON
-
'
TACT
SEPARATION
THAT
IS
LESS
THAN
THfe
RE
-
COMMENDED
OPEN
-
POSITION
BREAKER
CON
-
TACT
GAP
.
This
test
of
the
vacuum
interrupter
will
determine
its
internal
dielectric
condition
and
vacuum
integrity
,
With
the
,
breaker
open
,
individually
check
each
interrupter
by
con
-
necting
the
hipot
machine
“
HOT
”
lead
to
the
upper
stud
BREAKER
VOLTAGE
4
,
16
KV
7.2
KV
13.8
KV
TEST
VOLTAGE
14
KV
27
KV
27
KV
•
1
-
•
.
r
1
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