Siemens GM-SG

Instrument
Transformers
Control
Power
Transformer
Control
power
transformers
(
CPT
)
,
up
to
15
kVA
single
phase
,
with
the associated
primary
fuses
,
may
be
mounted
on a
rollout
tray
in
cell locations
D
and
F
.
CPT
'
s
larger
than
15
kVA
single
phase
,
and all three
phase
CPTs
,
are
stationary
mounted
,
either
in
the
rear
of
the
switchgear
section
,
or
in
the
lower
front
cell
,
or
remote
.
If
the
CPT
is located
in
the
rear
of
the section
,
the
primary
fuses
are
mounted
on a
rollout
fuse
tray
which is located
in
cell location
F
in
the lower
front
cell
.
If
the
CPT
is located
in
the lower
front
cell
,
the
primary
fuses
are
mounted
on a
rollout
fuse
tray
which
is located
in
the
upper
cell
in
cell location
D
.
The
secondary
molded
case
circuit breaker is
normally
mounted
on
the
front of
the
CPT
rollout
tray
,
interlocked
with
the
tray
so
that the circuit breaker
must
be
open
before
the
tray
can
be withdrawn
or
inserted
.
For
large
units
,
the
secondary
molded
case
circuit
breaker
may
be
mounted
separately
,
and
key
interlocked
with
the rollout
fuse
tray
so
that the
secondary
circuit
breaker
must
be
locked
open
before
the rollout
fuse
tray
can
be
withdrawn
.
•
Removing
VT
Rollout
Tray
from Cell
-
If
the
VT
Rollout
Tray
is
to
be removed
completely
from
a
cell
not
at
floor
level
,
insert the
two
extension rails into
the
fixed
rails
prior
to
following
the
steps
listed above
for
disconnecting
the
VT
Rollout
.
Be
sure
the
extension rails
are
properly
secured
in
place
.
(
Refer
to
Figure
32
C
)
.
Roll the
VT
Rollout
tray
from
the cell
on
the
extension
rails
using
the handle
located
on
the
front
cover
of
the rollout
tray
.
The
VT
rollout
tray
may
be
removed
from
the extension rails
by using
the
approved
Siemens
rollout
tray
lifting
device
(
see
Figure
43
B
)
,
or a
lifting
sling
rated
for
a
minimum
of
380
lbs
(
172
kg
)
(
see
Figure
50
B
)
and
a
suitable
crane
.
•
To
Connect
VT
Rollout
-
Connecting
(
inserting
)
the
voltage
transformer
rollout
tray
is
the
reverse
of
the
disconnecting
operation
.
The handle
/
interlock bar
must
be
in
the
"
notched
"
area
in
the
mounting
bracket
,
with
the
interlock
bar
withdrawn
.
Push
the
rollout
tray
in
firmly
to
the
fully
connected
position
.
When this is done
,
a
hole
in
the extension rail should
align
with
the handle
/
interlock bar
,
which
will
allow
the handle
/
interlock bar
to
be released
,
locking
the
rollout
tray
into the connected
position
in
the
unit
.
•
To
Disconnect
CPT
Rollout
or
CPT
Fuses
-
(
Refer
to
Figure
33
)
Withdrawal
of
a
CPT
rollout
or a
CPT
fuse
rollout is similar
to
withdrawal
of
a
VT
rollout
,
except
that the
secondary
circuit breaker
must
be
opened
before
the rollout
tray
can
be
withdrawn
.
If
the
secondary
molded
case
circuit breaker is
mounted
directly
on
the rollout
tray
,
the circuit breaker
will
be
mechanically
interlocked
with
the
handle
/
interlock bar
.
If
the circuit breaker is
separately
mounted
,
the circuit
breaker
will
be
key
interlocked
with
the handle
/
interlock
bar
.
Opening
of
the
circuit breaker
will
allow
operation
of
the
key
interlock
,
which
will
make the
key
available
.
This
key
should then
be
inserted
in
the
key
interlock
on
the rollout
tray
,
to
allow the
tray
to
be withdrawn
.
•
Removing
CPT
Rollout
or
CPT
Fuses
from Cell
-
If
the
CPT
Rollout
or
CPT
Fuses
are
to
be removed
completely
from
a
cell
not at
floor
level
,
insert the
two
extension rails into the
fixed
rails
prior
to
following
the
steps
listed above
for
disconnecting
the
CPT
Rollout
or
CPT
Fuses
.
Be
sure
the extension rails
are
properly
secured
in
place
.
(
Refer
to
Figure
32
C
)
.
Roll the
CPT
Rollout
or
CPT
Fuses
from
the
cell
on
the
extension
rails
using
the handle located
on
the
front
cover
of
the
rollout
tray
.
The
VT
rollout
tray
may
be removed
from
the extension rails
by using
the
approved
Siemens
rollout
tray
lifting
device
(
see
Figure
43
B
)
,
or a
lifting
sling
rated
for
a
minimum
of
380
lbs
(
172
kg
)
(
see
Figure
50
B
)
and
a
suitable
crane
.
Operating
Sequence
A
WARNING
Hazardous
voltages
.
Can
cause
death
,
serious
injury
and
property
damage
.
Do
not
place
hands
or
objects
into rollout
trays
until the rollout
tray
is
fully
withdrawn
from
cell
.
When
inserting
or
withdrawing
a
rollout
tray
,
always
complete
the action
in
one
continuous motion
.
A
WARNING
Heavy
weight
.
Can
cause
death
,
serious
injury
or
property
damage
.
Always
use
extension rails
to
remove or
install rollout
trays
in
cells
not
installed
at
floor
level
.
•
To
Disconnect
VT
Rollout
--
(
Refer
to
Figure
32
)
For
disconnecting voltage
transformers
from
the
primary
circuit
,
grasp
the handle
/
interlock latch
on
the
right
side
of
the rollout
tray
,
and
rotate
the handle
downward
while
pulling
the handle
horizontally
towards the
center
of
the
unit
.
The handle
will
lodge
in
a
"
notched
"
area
in
the
mounting
bracket
,
and the
interlock
portion
of
the handle
will
be withdrawn
from
the
guide
rail
on
the side
of
the cell
.
When the handle
is
operated
to
the unlatched
position
,
the rollout
tray
will
be
free
to
move
.
Using
the handle
on
the rollout
tray
,
pull
the
tray
in
a
smooth motion
from
the
fully
inserted
(
connected
)
position
to
the
fully
withdrawn
(
disconnected
)
position
.
The handle
/
interlock latch
will
automatically
engage
the
guide
rail
on
the
right
side
of
the
cell
.
34
Courtesy of NationalSwitchgear.com