GE POWER/VAC 4.16 - Dummy Removable Element; Ground and Test Device

The
fuses
are
mounted
on
a
movable
carriage
equipped
with
primary
and
secondary
disconnecting
devices
.
Single
phase
control
power
transformers
of
15
kVA
and smaller
and
their
secondary
breaker
are
mounted
on
the
carriage
with
the
fuses
.
See
Fig
.
15
.
Larger
control
power
transformers
,
up
to
37.5
kVA
single
phase
or
45
kVA
3
phase
,
are
located
in
the
cable
compartment
behind their
associated
fuse
carriage
and
their
secondary
breaker
is
located
behind
a
hinged
cover
on
the
upper
cable
compartment
.
When
the
fuses
are
disconnected
,
they
are
at
a
safe
strik
-
ing
distance
from
all
live
parts
of
the
switchgear
.
In
addition
a
grounding
device is
provided
which
contacts
the
fuses
after
they
are
disconnected
,
effectively
removing
any
static
charge
from
the
fuses
.
In
this
position
the
fuses
may
be
safely
re
-
moved and
replaced
.
The
disconnecting
devices
are
capable
of
interrupting
transformer
magnetizing
current
,
but
should
not
be used
to
interrupt
load
current
.
Mechanical
or
key
interlocks
are
applied
to
prevent
operating
the disconnect
-
ing
device
while
the
load
is connected
.
This is
generally
ac
-
complished
by
interlocking
so
that
the
transformer
secon
-
dary
breaker
must
be
locked
in
the
open
position
before
the
disconnecting
device
can
be connected
or
disconnected
.
Current
-
limiting
fuse
and
control
power
transformer
roll
-
outs
are
located
in
auxiliary
units
.
The
key
for
the
dummy
element
interlock
will
usually
be
obtained
from
a
transfer
lock
at
which
all
the
source
keys
are
accumulated and
captured
before
the
dummy
element
key
can
be obtained
.
<
GROUND
AND
TEST DEVICE
This
device
is
designed
to
make either
the
upper
or
lower
primary
conductors
in
the breaker
unit
readily
accessible
.
The
type
PVV
manual
ground
and
test
device
,
provides
a
convenient
means
of
grounding
the cables
or
the bus
in
order
to
safeguard
personnel
who
may
be
working
on
the
cables
or
the
equipment
.
The
device
can
be
used
for
apply
-
ing
power
for
high
-
potential
tests
or
for
fault location
.
It
can
be used
to
measure
insulation resistance
(
megger
)
.
By
using
voltage
transformers
,
it
can
also
be
used
for
phasing
out
cables
.
Refer
to
the
instruction
book
provided
for
this
device
.
If
“
hotsticks
”
are
used
,
they
should
be
insulated
.
See
GEK
39686
.
CAUTION
—
NOTE
THAT
THE
MAIN
SWITCH
-
GEAR
BUS
IS CONNECTED
TO
THE
LOWER
STUDS
WHEN
THE
DEVICE
IS
INSTALLED
IN
AN
UPPER
COMPARTMENT
AND
TO
THE
UPPER
STUDS
WHEN
THE
DEVICE IS INSTALLED
IN
A
LOWER
COMPARTMENT
.
Refer
to
Fig
.
9
,
which
shows
a
side
section
view
of
the
switchgear
,
for
clarification
.
DUMMY
REMOVABLE
ELEMENT
,
TYPE
PVD
(
GEK
39678
)
#
In
addition
to
the
device
described above
,
there
is
avail
-
able
the
deluxe
power
-
operated
type
GMV
device
which
has
a
self
-
contained
bus
or
line selector
switch
and
a
separately
controlled
,
power
operated
,
three
-
phase
grounding
switch
.
The
GMV
device is
a
dead
-
front
design
with mechanical
and
electrical interlocks
,
provision
for
remote
control and
plug
-
type
cable
testing
and
phasing
.
The
primary
conductors
re
-
quired
for
grounding
are
self
-
contained
,
with
no
external
cable
connections
required
.
The
GMV
device
is
designed
for
maximum
safety
to
personnel
while
accomplishing
all
the
basic
required
grounding
and
testing
functions
.
Refer
to
the
instruction
book
GEK
39684
for
more
details
.
Dummy
removable elements
are
used
as
a
means
of
isolating
circuits
or
bus
sections
where
operation
is
in
-
frequent
and
a
circuit breaker
cannot
be
economically
)
usti
-
fied
.
The
device
consists
of
a
circuit
breaker
mechanism
frame
and
primary
insulator
supports
with six
primary
studs
including
disconnecting
devices
.
Copper
rods
are
bolted
in
the
location
normally
occupied
by
vacuum
inter
-
rupters
.
The
stationary
structure
is
the
same
as
for
a
circuit
breaker
.
When
the
device is
fully
racked
in
,
it
connects
the
top
set
of
metal
-
clad
primary
disconnects
to
the bottom
set
.
An
interlock
system
,
consisting
of
a
side extension
identi
-
cal
to
the
positive
interlock
extension
of
a
standard
circuit
breaker
when
the
breaker
is closed
,
insures
that
the
dummy
element
cannot
be
racked
in
or
out
unless
all
sources
to
which
it
may
connect
are
de
-
energized
.
A
key
lock is
provided
on
the
dummy
element
.
It
takes
a
key
which becomes
available
only
when
all
sources
to
which
the
dummy
might
connect
are
de
-
energized
.
When
the
key
is available
,
the
key
interlock
can
be
operated
to
withdraw
the
positive
interlock
extension
.
The
dummy
element
now
looks
like
an
open
breaker
,
Mnd
it
can
be
racked
in
or
out
.
As
long
as
the
positive
interlock extension is
withdrawn
,
the
key
is
captured
and
it
cannot
be released
unless
the
dummy
element
is
in
the
CONNECTED
or
TEST
position
or
com
-
pletely
withdrawn
.
Hence
,
the
sources
to
which
the
dummy
may
connect
cannot
be
re
-
energized
until
the
dummy
is
in
one
of
these three
positions
.
20
Courtesy of NationalSwitchgear.com