Siemens GM-SG

Instrument
Transformers
Table
5
.
Rollout
Tray
and
Transformer Cell
Locations
Control
Power
and
Voltage
Transformers
-
General Information
When
required
,
voltage
transformers
(
VTs
)
,
or a
control
power
transformer
(
CPT
)
,
or
fuses for
a
CPT
can
be
mounted
on a
withdrawable rollout
tray
.
Each
auxiliary
cell
(
A
=
upper
,
or
B
=
lower
)
can
contain
up
to two
rollout
tray
cell locations
.
See
Table
5
for
various
rollout
tray
cell
locations
.
Rollout
trays
are
designed
with
metal extensions
on
each end
of
the
primary
fuses
.
These
extensions
wipe
across a
flexible
copper
strap
mounted
on
the
cubicle
as
the rollout
tray
is
withdrawn
.
This action
will
ground
each
side
of
the
primary
fuses
to
remove
any
residual
charge
from
the
fuses
or
transformers
,
and
grounds
the
primary
fuses
when the
tray
is
fully
withdrawn
.
As
the rollout
tray
is withdrawn
,
insulating
shutters
move
to
cover
the
cubicle
primary
disconnect
stabs
.
Note
:
The
insulating
shutter is
only
a
part
of
the
primary
insulation
system
,
and
the
outer
surface of
the
insulating
shutter
will
not
be
at
ground
potential
.
It
should
not
be
assumed
,
therefore
,
that
personnel
can
contact
the
insulating
shutter
with
complete
safety
.
Rollout
Tray May
Be
Used
For
:
Cell
Location
Cell
Voltage
Transformer
(
VT
)
C
Voltage
Transformer
(
VT
)
or
Control
Power
Transformer
(
CPT
)
up
to
15
kVA
single
Phase
A
(
Upper
)
D
Fuses
on a
withdrawable
tray
for
a
CPT
installed
in
cell locations
E
&
F
(
over
15
kVA
single
phase
,
or
any
other three
phase
)
Voltage
Transformer
(
VT
)
E
Voltage
Transformer
(
VT
)
or
Control
Power
Transformer
(
CPT
)
up
to
15
kVA
single
Phase
B
(
Upper
)
F
Fuses
on a
withdrawable
tray
for
a
CPT
installed
in
cell locations
E
&
F
(
over
15
kVA
single
phase
,
or
any
other
three
phase
)
A
DANGER
Hazardous
voltages
.
Will
cause
death
,
serious
personal
injury
,
or
property
damage
.
Do
not
touch shutter
or
barrier
if
equipment
is
energized
.
De
energize
and
ground
high
voltage
conductors
before
working
on or near
them
.
GMSG
Breaker
4
“
1
Voltage
Transformers
One
,
two
,
or
three
voltage
transformers
with
primary
fuses
may
be mounted
on
the rollout
tray
located
in
cell locations
C
,
D
,
E
,
and
/
or
F
.
See
the
"
Operating
Sequence
”
section
for
disconnecting
,
connecting
or
withdrawal instructions
.
Typical
rollout
tray
and
transformer
cell locations
are
shown
in
the side views
in
Figure
31
.
i
E
i
VT
CPT
F
Feeder
Circuit
Breaker
/
Auxiliary
c
VT
D
J
J
TFPFE
:
*
E
T
CPT
F
D
Auxiliary
/
Auxiliary
Figure
31
.
Typical
VT
,
CPT
and
CPT
Fuse
Rollout
33
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