ABB 15VHK500 - Page 5

ABB
IB
6.2
.
7.7
.
-
1
Page
5
ASEA
BROWN BOVERI
Installing
Circuit
Breaker into
Compartment
(
See
Figs
.
3
&
4
)
NOTE
:
CLOCKWISE
ROTATION
of
racking
crank
for
inserting
breaker
.
COUNTERCLOCKWISE
rotation
of
racking
crank
for
removal
of
breaker
.
Turn
motor
disconnect
switch
(
1
,
Fig
.
3
)
to
“
OFF
"
position
.
Engage racking
crank
(
4
,
Fig
.
4
)
and
push
racking
unlock
-
ing
lever
(
3
)
to
left
,
then
rotate
racking
crank
counterclock
-
wise
only
until resistance
to
motion is
felt
(
DO NOT FORCE
)
.
If
closing springs
were
left
in
the
“
charged
”
condition
,
they
will
automatically
discharge
.
For
installing
the
circuit
breaker
into the lower
compart
-
ment
,
the
fifth
wheel is
used
to
position
the breaker
so
that
it
is lined
up
with
the
switchgear
.
Engage
the
fifth
wheel
(
12
,
Fig
.
3
)
with
hole
(
5
,
Fig
.
3
)
.
The
lift
device is
required
to
lift
and
position
the
breaker
for
installation into the
upper
compartment
.
Guide
and
push
circuit
breaker
into
compart
-
ment
until
stopped
.
Again
engage
racking
crank and
rotate
clockwise
until
racking
mechanism
automatically
stops
at
“
DISCONNECT
’
position
.
(
Breaker is
now
held
captive
in
compartment
.
)
To
rack
circuit
breaker
to
‘
TEST
”
position
,
push
racking
unlocking
lever
(
3
,
Fig
.
4
)
to
left
,
rotate
racking
crank
approximately
1
/
4
turn
clockwise
,
then
release
unlocking
lever
.
Continue
cranking
until
racking
mechanism
auto
-
matically
stops
at
'
TEST
”
position
.
With
thecircuit
breaker
racked
to
TEST
”
position
,
it
should
be
checked
for
proper
operation
by operating
all
possible
means
of
opening
and
closing
,
this includes
control
switches
,
relays
,
etc
.
Turn motordisconnect
switch
(
1
,
Fig
.
3
)
to
“
ON
”
position
to
charge
the
closing springs
,
and
operate
the
breaker
as
required
.
The
insulated
vacuum
envelope
(
2
)
should be examined
carefully
for
cracks
in
the
area
of
the metal
-
to
-
insulation
seals
on
both ends
and
around
the mid
-
band
ring
.
Since
a
certain
amount
of
transmitted
light
is
usually
required
to
detect cracks
,
the
inspection
should be done
in
a
well
lighted
area
.
If
the mid
-
band
ring
,
when
so
equipped
,
has
been
bent
by
an
accidental
impact
,
that
area
should be
specially
scruntinized
for
seal
damage
.
Small
external
chips
,
however
,
will
not
impair
the
useful life
of
the
inter
-
rupter
.
To
prevent
loss
of
vacuum care
should be exercised
so
as
not
to
damage
the
interrupter
’
s
plastic
cover vacuum
Pinch
-
off
tube
(
3
)
.
Insulation
Structure
All
insulated
parts
should be checked
for
damage
.
Any
dust
or
dirt
should
be removed
by
air
or
wiped
with
a
clean
lintless cloth
saturated
with
an
oil
-
free
solvent
.
This
is
important
because
dirt
and dust
can
accumulate and
,
with
moisture
,
can
place
the
circuit
breaker
in
jeopardy
,
dielec
-
trically
.
The
lead
support
moldings
are
basically polyester
glass
and
occasionally
have
some
resin
rich
cracks
or
crazing
develop
but
these do
not
indicate
defective
material
and
should
not
cause concern
.
Installing
Front
Cover
and
Interphase
Barrier
(
See
Fig
.
D
Install
the assemble and
fasten
with
four
lower
front
cover
screws
(
1
)
and
one screw
(
7
)
on
each
side
,
inside the
front
cover
.
NOTE
:
It
is
recommended
thatadielectricwithstandtest
be
made
prior
to
initially
putting
this
or
any
type
vacuum
circuit
breaker into service
.
Refer
to
Dielectric
Tests
,
in
the
Main
-
tenance
,
Adjustments
and Tests section
of
this bulletin
,
for
the
correct
test
procedure
.
WARNIG
WARNING
WARNING
WARNING
When
racking
circuit breaker
to
“
CONNECTED
”
position
,
close
compartment
door
(
1
,
Fig
.
4
)
and
insert
racking
crank
(
4
,
Fi
3
4
.
)
through sliding
panel
(
2
,
Fig
.
4
)
.
Push
unlocking
lever
(
3
)
to
left
and
turn
racking
crank
(
4
)
approximately
1
/
4
turn
clockwise
,
then release
unlocking
lever
.
Continue
cranking
until
racking
mechanism
auto
-
matically
stops
at
“
CONNECTED
”
position
.
CAUTION CAUTION
CAUTION CAUTION
Do
not
attempt
to
rack
any
further
.
The
circuit
breaker
may
now
be
put
in
service and be
operated
as
required
.
CIRCUIT
BREAKER
REMOVAL
(
See
Fig
.
4
)
To
remove
circuit breaker
from
“
CONNECTED
”
position
Fig
.
4
—
Method
of
Racking
Circuit
Breaker
Courtesy of NationalSwitchgear.com