GE AKD-6 - Key Interlocks for Fuse Rollouts

Low
Voltoge
Swifchgeor,
GEK-72101
{INNER
HoUsE
S|DE SHEET
P',,
KEY
LOCK
LOCK
FlG.
22
(75C150021)
Key Interlock
for
AKR
breokers
KEY INTERLOCKS
FOR
AKR BREAKERS
(OPTIONAL)
The
key interlock
is
mounted
with two
one-way screws
and lock
washers
to
the left.
side of the
inner house.
The interlock
system
is designed
so
that the key
may
be
removed
from
the lock
only if the
breaker is
tripped
and
the
lock
bolt is
extended.
When
the bolt
is extended,
the
breaker
is rendered
trip
free
only
in the
CONNECTED po-
sition in
the
house.
The
breaker
may
be
operated
(closed
and
tripped) in
the
TEST
or DISCONNECTED
positions
even
when the lock
bolt is
extended
and the
key removed.
The
operation
of
the
key interlock
should
be checked
as follows:
1.
With the
breaker
in the
CONNECTED position,
man-
ually trip
the
breaker.
This
then
allows the interlock
trip
slide
(837-06)
to
be
pushed
in.
When the trip
slide is
in, the
lock
bolt
may be
extended
and
the key removed.
The
breaker
will
remain
trip
free
in
the CONNECTED
position
until
the
key is
returned
and
the lock
bolt
is retracted.
2. If
desired,
the
breaker
may
be moved
to either
the
TEST
or
the DISCONNECTED
position
while the key
is
removed
from the
lock.
In these
positions
the
breaker
can
be operated
for
checking
or maintenance.
KEY INTERTOCKS
FOR
FUSE
ROLTOUTS
(INCLUDED)
AK
breakers
that
are
used in AKD-6
switchgear
cannot
be
equipped
with
fuses
as an
integral
part
of the
breaker
assembly.
When
fuses
are required
with these
breakers,
they
are
mounted
inside
a
drawout
frame
similar
to that
used
for the
breaker.
This
assembly
is
known
as a
fuse
rollout
element,
and
a typical
model
is shown
in Figure
23.
A hinged
panel
made
of
perforated
steel
is
positioned
in
front
of
the fuses
so that
they
cannot
be reached
if
the
compartment
door
is opened.
An interference
angle
is at-
tached to
the left side
of this
panel
to
prevent
it from
being swung
open
unless the fuse
rollout is
fully withdrawn.
The fuse rollout
is
usually located
in
a modified
breaker
compartment
directly
below
the compartnient
for tlic
breaker
with
which the
fuses
will be
used. It is
put
into
this compartment
the same
way an AK
breaker
is inserted
into
a compartment.
See Page
16.
NOTE:
THE
KEY LOCK
BOLT
IN THE
FUSE
ROLLOUT
COMPARTMENT
MUST BE
RE-
TRACTED
BEFORE
THE
ROLLOUT
CAN BE
RACKED
INTO
THE
CONNECTED
POSITION.
HOUSE
CAM,mRT
0F 84t-01
FlG.
23
(8040045)
Fuse
Rollour
used wirh
AK
breokers
27