GE IFCV51AD User manual
GEK
-
49946
CONTENTS
PAGE
DESCRIPTION
APPLICATION
CALCULATION
OF
SETTINGS
CONSTRUCTION
RATINGS
3
3
4
5
6
6
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
7
7
CONTACTS
BURDENS
.
8
8
8
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
CHARACTERISTICS
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
DRAWOUT
RELAY
TESTING
POWER
REQUIREMENTS
,
GENERAL
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
INSTALLATION
INSTALLATION
TESTS
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
..
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
CONTACT
CLEANING
SYSTEM
TEST
8
9
9
9
9
10
10
10
10
11
11
11
12
13
14
14
14
15
15
15
15
15
16
SERVICING
16
INDUCTION
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
RENEWAL
PARTS
LIST
OF
FIGURES
18
18
18
19
-
2
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
TIME
OVERCURRENT
RELAYS
WITH
VOLTAGE
RESTRAINT
TYPES
IFCV
51
AD
IFCV
51
BD
DESCRIPTION
The
Type
IFCV
51
AD
relay
is
a
single
-
phase
,
extended
range
,
very
inverse
time
overcurrent
relay
with
voltage
restraint
,
similar
to
the
IFC
51
A
relay
except
that
a
voltage
restraint
U
-
magnet
and
coil
has
been
added
that
produces
a
restraint
torque
that
opposes
the
operating
coi
1
.
The
time
overcurrent
unit
is
The
IFCV
51
B
0
is
overcurrent
is
included
,
respectively
,
of
the
IFCV
51
BD
,
with
components
identified
by
the
nomenclature
used
throughout
the
text
.
The
relays
are
equipped
with
a
dual
-
rated
target
and
seal
-
in
unit
having
two
electrically
separate
contacts
.
They
are
mounted
in
a
size
Cl
case
of
molded
construction
.
The
outline
and
panel
drilling
dimensions
are
shown
in
Figure
18
for
semi
-
flush
mounting
,
and
in
Figure
19
for
surface
mounting
.
When
semi
-
flush
capa
bi
1
i
ty
.
similar
to
the
IFCV
51
AD
except
that
an
instantaneous
Figures
1
and
2
show
the
front
and
back
views
,
mounted
on
a
suitable
panel
,
these
relays
have
a
high
seismic
The
internal
connections
are
shown
in
Figure
3
for
the
IFCV
51
AD
,
and
in
Figure
4
for
the
IFCV
51
BD
.
APPLICATION
A
system
must
be
protected
against
prolonged
generator
contribution
to
a
fault
on
the
system
.
contributing
current
,
the
generator
.
The
IFCV
relay
is
one
of
several
relays
designed
specifically
for
this
application
,
or
applied
to
provide
such
back
-
up
protection
.
Others
are
the
Type
IFCS
voltage
-
controlled
overcurrent
relay
,
or
three
single
-
phase
distance
relays
plus
a
timer
(
for
balanced
fault
back
-
up
protection
)
,
and
the
Type
INC
or
SGC
relays
for
unbalanced
fault
back
-
up
protection
.
Such
back
-
up
protection
is
best
made
at
the
source
of
the
The
choice
between
the
IFCV
or
the
distance
relays
is
determined
primarily
by
the
protective
relaying
,
with
which
the
generator
back
-
up
relays
must
be
selective
.
For
example
,
if
the
lines
leaving
the
station
bus
are
protected
by
very
inverse
time
overcurrent
relays
,
then
Type
IFCV
relays
should
be
used
.
These
instructions
do
not
purport
to
cover
ell
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
instailation
,
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
Should
operation
or
maintenance
.
IEEE
and
NEKA
standards
/
-
3
-
Courtesy of NationalSwitchgear.com
6
EK
-
49946
This
would
be
typical
of
installations
where
the
generator
connects
to
the
bus
at
generator
voltage
,
installations
generally
connect
to
a
high
voltage
system
,
on
which
distance
or
pilot
relaying
schemes
are
frequently
used
for
the
line
protection
.
In
such
cases
,
distance
relays
such
as
the
CEB
13
C
,
plus
a
timer
,
would
be
the
usual
choice
for
system
back
-
up
to
provide
coordination
with
the
line
relaying
.
On
the
other
hand
,
unit
generator
-
transformer
For
the
situations
noted
above
,
the
recommended
practice
is
to
use
three
IFCV
relays
,
one
per
phase
,
or
three
single
-
phase
distance
units
plus
a
timer
.
In
many
cases
,
especially
on
larger
machines
,
a
negative
sequence
time
overcurrent
relay
,
Type
INC
or
SGC
,
is
installed
to
provide
back
-
up
protection
against
unbalanced
system
faults
.
In
such
cases
a
single
Type
IFCV
relay
,
to
protect
against
balanced
system
faults
,
could
be
considered
as
a
minimum
requirement
.
In
some
applications
it
may
be
more
advantageous
to
use
a
voltage
-
controlled
Type
IFCS
relay
rather
than
an
IFCV
.
The
IFCV
can
provide
faster
back
-
up
protection
than
the
IFCS
,
particularly
in
instances
where
the
generator
voltage
does
not
drop
significantly
below
rated
voltage
during
fault
conditions
.
On
the
other
hand
,
if
the
generator
voltage
always
drops
below
the
setting
of
the
undervoltage
unit
in
the
IFCS
for
all
faults
for
which
the
generator
back
-
up
is
required
to
operate
,
better
sensitivity
can
be
obtained
by
using
the
IFCS
rather
than
the
IFCV
.
The
current
source
for
Type
IFCV
relays
should
be
current
transformers
at
the
neutral
end
of
the
generator
windings
when
such
CT
'
s
are
available
.
With
these
connections
,
in
addition
to
external
-
fault
back
-
up
protection
the
relays
will
provide
generator
fault
back
-
up
protection
even
if
the
generator
breaker
is
open
or
there
are
no
other
sources
of
generation
on
the
system
.
If
the
neutral
CT
'
s
are
not
available
,
then
it
will
be
necessary
to
use
line
-
side
CT
'
s
.
With
these
connections
,
Type
IFCV
relays
will
be
operative
as
fault
back
-
up
protection
for
the
generator
only
when
the
generator
breaker
is
closed
,
and
there
is
another
source
of
generation
on
the
system
.
Phase
-
to
-
phase
voltage
should
be
obtained
from
the
generator
potential
transformers
.
Loss
of
potential
to
the
Type
IFCV
relay
will
cause
the
relay
to
trip
if
the
generator
load
current
,
expressed
in
relay
secondary
amperes
,
is
greater
than
the
pickup
current
of
the
relay
.
An
additional
relay
,
the
Type
CFVB
,
is
available
for
protection
against
false
tripping
due
to
this
accidental
loss
of
the
relay
restraint
voltage
.
The
diagram
in
Figure
5
shows
typical
external
connections
for
the
Type
IFCV
relays
when
the
generator
connects
to
the
bus
at
generator
voltage
.
If
Type
IFCV
relays
are
applied
on
a
unit
generator
-
transformer
installation
,
the
external
connections
shown
in
Figure
6
are
typical
.
-
4
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
CALCULATION
OF
SETTINGS
Pickup
with
full
voltage
restraint
of
the
Type
IFCV
relay
should
generally
be
set
between
200
%
and
250
%
of
full
load
current
on
regulated
generators
,
and
between
150
%
and
200
%
full
load
current
on
unregulated
generators
.
The
relay
time
setting
is
determined
by
system
selectivity
requirements
.
Though
the
current
decrement
curves
of
the
generator
must
be
taken
into
consideration
to
determine
the
actual
operating
time
of
the
Type
IFCV
relay
,
simplifying
assumptions
can
be
made
which
facilitate
application
of
the
Type
IFCV
relay
and
yet
maintain
a
satisfactory
operating
performance
.
The
maximum
fault
current
condition
for
which
time
-
current
coordination
must
be
obtained
should
be
based
on
the
transient
reactance
of
the
generator
.
If
the
calculations
are
further
based
on
the
premise
that
for
a
bus
fault
the
voltage
presented
to
the
Type
IFCV
relay
is
0
,
then
the
Type
IFCV
can
be
coordinated
with
the
bus
and
/
or
system
relaying
on
a
straight
overcurrent
basis
.
Coordination
of
the
Type
IFCV
relay
and
other
system
relays
for
system
faults
where
voltage
will
be
presented
to
the
Type
IFCV
relay
is
thereby
assured
.
This
conservative
assumption
of
the
zero
-
voltage
fault
is
equally
applicable
to
the
unit
generator
-
transformer
case
,
even
though
the
IFCV
restraint
voltage
may
come
from
generator
potential
transformers
,
justification
for
this
application
assumption
is
its
inherent
conservatism
,
and
the
basic
fact
that
the
operating
characteristic
of
the
Type
IFCV
relay
is
fairly
constant
for
all
low
-
voltage
conditions
.
The
CONSTRUCTION
The
IFCV
induction
disk
relays
consist
of
a
molded
case
,
cover
,
support
structure
assembly
,
and
a
connection
plug
to
make
up
the
electrical
connection
.
See
cover
figure
and
Figures
1
and
2
.
Figures
1
and
2
show
the
induction
unit
mounted
to
the
molded
support
structure
.
This
disk
is
activated
by
a
current
-
operated
coil
mounted
on
a
laminated
U
-
magnet
and
restrained
by
a
voltage
-
operated
coil
mounted
on
a
laminated
U
-
magnet
.
The
disk
and
shaft
assembly
carries
a
moving
contact
that
completes
the
alarm
or
trip
circuit
when
it
touches
a
stationary
contact
.
The
disk
assembly
is
restrained
by
a
spiral
spring
to
give
proper
contact
closing
and
its
rotation
is
retarded
by
a
permanent
magnet
mounted
in
a
molded
housing
on
the
support
structure
.
The
drawout
connection
/
test
system
for
the
Cl
case
,
shown
in
Figure
17
,
has
provisions
for
14
connection
points
,
and
a
visible
CT
shorting
bar
located
up
front
.
As
the
connection
plug
is
withdrawn
,
it
clears
the
shorter
contact
fingers
in
the
output
contact
circuits
first
.
Thus
,
the
trip
circuit
is
opened
before
any
other
circuits
are
disconnected
.
The
CT
shorting
bar
is
engaged
by
the
current
circuit
fingers
(
located
at
the
lower
front
of
the
case
)
to
short
-
circuit
external
current
transformer
secondary
connections
.
The
window
provides
visual
confirmation
of
CT
shorting
.
The
connection
plug
then
clears
the
voltage
circuit
and
current
circuit
fingers
on
the
case
,
and
finally
those
on
the
relay
support
structure
,
to
completely
de
-
energize
the
drawout
element
.
-
5
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
There
is
a
High
-
Seismic
target
and
seal
-
in
unit
mounted
to
the
front
left
of
the
support
structure
,
contacts
,
one
of
which
is
in
series
with
its
coil
and
in
parallel
with
the
contacts
of
the
induction
unit
such
that
when
the
induction
unit
contacts
close
,
the
seal
-
in
unit
picks
up
and
seals
in
.
When
the
seal
-
in
unit
picks
up
,
it
raises
a
target
into
view
which
latches
up
and
remains
exposed
until
released
by
presing
a
button
located
on
the
upper
left
side
of
the
cover
.
The
seal
-
in
unit
has
two
electrically
-
separate
The
IFCV
51
BD
model
relays
,
in
addition
to
the
above
,
contain
a
High
Seismic
instantaneous
unit
(
see
Figure
1
)
.
electrically
separate
contacts
and
is
mounted
to
the
front
right
of
the
support
structure
.
When
the
instantaneous
unit
picks
up
it
raises
a
target
,
which
latches
up
and
remains
exposed
until
it
is
released
.
The
same
reset
button
that
releases
the
target
seal
-
in
unit
also
releases
the
target
of
the
instantaneous
unit
.
The
instantaneous
unit
has
two
Magnetic
shields
,
depicted
in
Figure
1
,
are
mounted
to
the
support
structure
to
eliminate
the
proximity
effect
of
external
magnetic
materials
.
Both
the
High
-
Seismic
target
and
seal
-
in
unit
and
the
High
-
Seismic
instantaneous
unit
have
the
letters
"
Hi
-
G
"
molded
into
their
target
blocks
to
distinguish
them
as
High
-
Seismic
units
.
Seismic
Fragility
Level
exceeds
peak
axial
acceleration
rate
of
lOg
'
s
(
4
g
ZPA
)
when
tested
using
a
biaxial
multi
-
frequency
input
motion
to
produce
a
Required
Response
Spectrum
(
RRS
)
in
accordance
with
the
IEEE
Guide
for
Seismic
Testing
of
Relays
,
STD
501
-
1978
.
RATINGS
The
relays
are
designed
for
operation
in
an
ambient
air
temperature
from
-
20
OC
to
+
55
°
C
.
INDUCTION
UNIT
The
current
coil
ratings
are
given
in
Table
I
.
TABLE
I
-
2
-
16
AMPERE
TAP
RANGE
TAP
2
2.5
3
4
5
6
8
10
12
16
Continuous
Current
Rating
3.8
4.4
4.9
5.4
6.0
6.5
7.0
7.6
8.1
8.5
The
relay
will
pick
up
at
the
tap
value
when
rated
voltage
is
applied
to
the
restraint
circuit
,
pick
up
at
25
%
trip
value
,
value
of
restraint
voltage
.
With
0
voltage
on
the
restraint
circuit
,
the
relay
will
Figure
7
shows
the
pickup
current
required
for
any
The
voltage
restraint
coil
is
rated
continuously
for
the
nameplate
voltage
at
rated
frequency
.
-
6
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
The
one
-
second
thermal
ratings
are
listed
i
#
Table
II
.
TABLE
II
One
-
Second
Rating
Any
Tap
(
Amperes
)
Time
Overcurrent
Unit
(
Amperes
)
Model
K
16
,
384
128
2
-
16
IJCV
51
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
The
instantaneous
coil
is
tapped
for
operation
on
either
one
of
two
ranges
(
H
or
L
)
.
Selection
of
the
high
or
low
range
is
determined
by
the
position
of
the
link
located
on
the
top
of
the
support
structure
.
See
Figure
1
and
Table
III
.
TABLE
III
Continuous
One
Second
Link
**
Range
Rating
Rating
Position
(
Amps
)
(
Amps
)
(
Amps
)
High
-
Seismic
Instantaneous
Unit
(
Amps
)
K
6
-
30
10.2
L
67
,
600
260
6
-
150
19.6
30
-
150
H
*
*
The
range
is
approximate
,
which
means
that
the
6
-
30
,
30
-
150
may
be
6
-
28
,
28
-
150
.
There
will
always
be
at
least
one
ampere
overlap
between
the
maximum
L
setting
and
the
minimum
H
setting
.
Whenever
possible
,
be
sure
to
select
the
higher
continuous
and
short
-
time
ratings
.
Higher
currents
may
be
applied
for
shorter
lengths
of
time
in
accordance
with
the
formula
:
I
+
v
/
K
/
T
is
in
series
with
the
time
overcurrent
unit
Since
the
instantaneous
unit
coil
coil
,
see
Tables
II
and
III
to
determine
the
current
-
limiting
element
for
both
continuous
and
short
-
time
ratings
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
Ratings
for
the
target
and
seal
-
in
unit
are
shown
in
Table
IV
.
TABLE
IV
TAP
0.2
2.0
(
ohms
)
(
amperes
)
(
amperes
)
(
seconds
)
(
seconds
)
(
ohms
)
(
ohms
)
8.3
0.24
DC
Resistance
+
10
%
Minimum
Operating
Carry
Continuously
Carry
30
amps
for
Carry
10
amps
for
60
Hertz
impedance
50
Hertz
impedance
0.2
2.0
0.37
2.3
0.05
2.2
0.45
20
0.65
50
0.54
42
-
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Courtesy of NationalSwitchgear.com
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-
49946
If
the
tripping
currrent
exceeds
30
amperes
,
an
auxiliary
relay
should
be
used
,
the
connections
being
such
that
the
tripping
current
does
not
pass
through
the
contacts
or
the
target
and
seal
-
in
coils
of
the
protective
relay
.
CONTACTS
The
current
-
closing
rating
of
the
contacts
is
30
amperes
for
voltages
not
exceeding
250
volts
,
unit
.
The
current
-
carrying
rating
is
limited
by
the
ratings
of
the
seal
-
in
BURDENS
INDUCTION
UNIT
The
potential
burdens
at
rated
voltage
and
rated
frequency
are
given
in
Table
V
.
TABLE
V
Vol
t
Volts
Freq
.
Watts
Vars
Amps
120
50
9.26
14.4
17.1
17.3
19.7
120
60
9.43
The
current
circuit
burdens
with
5
amperes
flowing
in
the
lowest
tap
are
listed
in
The
burden
on
any
other
tap
with
5
amperes
flowing
is
approximately
(
Lowest
Tap
/
Actual
Tap
)
2
times
the
burden
for
the
lowest
tap
.
Table
VI
.
TABLE
VI
r
Impedance
Ohms
'
Range
Frequency
Tap
Amp
VA
PF
2
-
16
50
2.58
77.5
0.43
66.5
0.43
2
5
2
-
16
60
3.10
2
5
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
The
High
-
Seismic
instantaneous
unit
burdens
are
listed
in
Table
VII
.
TABLE
VII
Burdens
in
Ohms
(
Z
)
Times
Pickup
Burdens
at
Min
.
Pickup
(
Ohms
)
li
-
Seismic
,
Inst
.
Unit
Hz
Link
(
Amps
)
Min
.
Range
Pickup
Position
(
Amps
)
(
Amps
.
)
R
Jx
Z
3
10
20
L
6
-
30
6
0.110
0.078
0.135
0.095
0.081
0.079
6
-
150
60
30
-
150
30
H
0.022
0.005
0.023
0.022
0.022
0.022
L
6
-
30
6
0.092
0.065
0.112
0.079
0.068
0.066
6
-
150
50
H
30
-
150
30
0.018
0.004
0.019
0.018
0.018
0.018
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Courtesy of NationalSwitchgear.com
GEK
-
49946
CHARACTERISTICS
INDUCTION
UNIT
TABLE
VIII
-
Tap
Connections
1.0
1.25
1.5
3.0
4.0
0.625
2.0
2.5
Zero
Volts
120
Volts
0.5
0.75
10.0
12.0
16.0
6.0
8.0
2.0
2.5
3.0
4.0
5.0
G
A
A
C
A
F
A A A
A
Taps
C
G
F F
E
H
D
H
B
H
Pickup
Pickup
1
n
these
relays
1
s
defined
as
the
current
required
to
close
the
contacts
from
the
0.5
time
-
dial
position
.
Current
settings
are
made
by
means
of
two
movable
leads
that
connect
to
the
tap
block
at
the
top
of
the
support
structure
(
see
Figure
1
)
.
The
tap
block
1
s
marked
A
through
H
.
See
the
nameplate
on
the
relay
for
tap
settings
.
The
relay
will
pick
up
at
tap
value
when
rated
voltage
1
s
applied
to
the
restraint
circuit
.
With
0
voltage
on
the
restraint
circuit
,
the
relay
will
pick
up
at
25
%
tap
value
.
Figure
7
shows
typical
pickup
current
required
for
any
given
value
of
restraint
voltage
.
Pickup
1
s
affected
by
the
phase
angle
of
the
fault
current
.
A
typical
phase
angle
characteristic
1
s
shown
1
n
Figure
8
.
Operating
Time
Accuracy
The
IFCV
relays
should
operate
within
+
7
%
or
+
0.050
second
,
whichever
1
s
greater
.
Figures
9
and
10
show
the
time
-
current
characteristics
for
IFCV
relays
.
The
setting
of
the
time
dial
determines
the
length
of
time
required
to
close
the
contacts
for
a
given
current
.
The
higher
the
time
-
dial
setting
,
the
longer
the
operating
time
.
The
contacts
are
just
closed
when
the
time
dial
is
set
to
0
.
setting
occurs
when
the
time
dial
1
s
set
to
10
and
the
disk
has
to
travel
Its
maximum
distance
to
close
the
contacts
.
The
maximum
time
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
The
instantaneous
unit
has
a
25
-
to
-
l
range
with
a
tapped
coil
,
low
ranges
,
selected
by
means
of
a
link
located
on
the
top
of
the
support
structure
.
See
Figure
1
.
Figure
12
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
There
are
high
and
The
time
-
current
curve
for
the
instantaneous
unit
1
s
shown
in
The
target
and
seal
-
in
unit
has
two
tap
selections
located
on
the
front
of
the
unit
.
See
Figure
1
.
-
9
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
RECEIVING
,
HANDLING
AND
STORAGE
These
relays
,
when
not
included
as
part
of
a
control
panel
will
be
shipped
in
cartons
designed
to
protect
them
against
damage
,
relay
,
examine
it
for
any
damage
sustained
in
transit
.
resulting
from
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
promptly
notify
the
nearest
General
Electric
Sales
Office
.
Immediately
upon
receipt
of
a
If
injury
or
damage
Reasonable
care
should
be
exercised
in
unpacking
the
relay
in
order
that
none
of
the
parts
are
injured
or
the
adjustments
disturbed
.
If
the
relays
are
not
to
be
installed
immediately
,
they
should
be
stored
in
their
original
cartons
in
a
place
that
is
free
from
moisture
,
dust
and
metallic
chips
.
Foreign
matter
collected
on
the
outside
of
the
case
may
find
its
way
inside
when
the
cover
is
removed
,
and
cause
trouble
in
the
operation
of
the
relay
.
ACCEPTANCE
TESTS
Immediately
upon
recept
of
the
relay
an
Inspection
and
Acceptance
Test
should
be
made
to
insure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed
,
readjustment
is
necessary
,
refer
to
the
section
on
SERVICING
.
Since
operating
companies
use
different
procedures
for
Acceptance
and
Installation
Tests
,
the
following
section
includes
all
applicable
tests
that
may
be
performed
on
these
relays
.
These
tests
may
be
performed
as
part
of
the
Installation
or
ofv
the
Acceptance
Tests
,
at
the
discretion
of
the
user
.
If
the
examination
or
test
indicates
that
VISUAL
INSPECTION
Check
the
nameplate
to
insure
that
the
model
number
and
rating
of
the
relay
agree
with
the
requisition
.
Remove
the
relay
from
its
case
and
check
that
there
are
no
broken
or
cracked
parts
or
any
other
signs
of
physical
damage
.
MECHANICAL
INSPECTION
1
.
There
should
be
no
noticeable
friction
when
the
disk
is
rotated
slowly
clockwise
.
The
disk
should
return
by
itself
to
its
rest
position
.
Make
sure
the
control
spring
is
not
deformed
,
nor
its
convolutions
tangled
or
touching
each
other
.
2
.
3
.
The
armature
and
contacts
of
the
seal
-
in
unit
,
as
well
as
the
armature
and
contacts
of
the
instantaneous
unit
,
should
move
freely
when
operated
by
hand
;
there
should
be
at
least
1
/
64
inch
wipe
on
the
seal
-
in
and
the
instantaneous
contacts
.
-
10
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
The
targets
in
the
seal
-
in
unit
and
in
the
instantaneous
unit
must
come
into
view
and
latch
when
the
armatures
are
operated
by
hand
,
and
should
unlatch
when
the
target
release
button
is
operated
.
Make
sure
that
the
brushes
and
shorting
bars
agree
with
the
internal
connections
diagram
.
4
.
5
.
6
.
CAUTION
:
SHOULD
THERE
BE
A
NEED
TO
TIGHTEN
ANY
SCREWS
,
DO
NOT
OVER
TIGHTEN
,
TO
PREVENT
STRIPPING
.
DRAWOUT
RELAY
TESTING
IFCV
relays
may
be
tested
without
removing
them
from
the
panel
by
using
either
the
12
XCA
28
A
1
or
12
XCA
11
A
1
test
probes
.
The
test
probes
make
connections
to
both
the
relay
and
external
circuitry
,
which
provides
maximum
flexibility
,
but
requires
reasonable
care
since
a
CT
shorting
jumper
is
necessary
when
testing
the
relay
.
CT
circuit
may
also
be
tested
by
using
an
ammeter
instead
of
the
jumper
.
See
the
test
circuit
in
Figure
13
.
connections
that
can
be
made
,
and
the
12
XCA
11
A
1
has
four
,
information
.
The
The
test
probes
are
different
in
the
number
of
The
12
XCA
28
A
1
has
a
full
complement
of
28
connections
Refer
to
instruction
book
GEK
-
49803
for
additional
POWER
REQUIREMENTS
,
GENERAL
Since
non
-
All
al
ternating
-
current
-
operated
devices
are
affected
by
frequency
,
sinusoidal
waveforms
can
be
analyzed
as
a
fundamental
frequency
plus
harmonics
of
the
fundamental
frequency
,
it
follows
that
alternating
current
(
AC
)
devices
(
relays
)
will
be
affected
by
the
applied
waveform
.
Therefore
,
in
order
to
test
AC
relays
properly
it
is
essential
to
use
a
sine
wave
of
current
and
/
or
voltage
,
harmonics
)
cannot
be
expressed
as
a
finite
number
for
any
particular
relay
.
However
,
any
relay
using
tuned
circuits
,
R
-
L
or
RC
networks
,
or
saturating
electromagnets
(
such
as
time
-
overcurrent
relays
)
would
be
essentially
affected
by
non
-
sinusoidal
waveforms
.
14
to
16
,
is
recommended
.
The
purity
of
the
sine
wave
(
i
.
e
its
freedom
from
•
5
Hence
a
resistance
-
limited
circuit
,
as
shown
in
Figures
INDUCTION
UNIT
Rotate
the
time
dial
slowly
and
check
,
by
means
of
a
lamp
,
that
the
contacts
just
close
at
the
0
time
-
dial
setting
.
The
point
at
which
the
contacts
just
close
can
be
adjusted
by
running
the
stationary
contact
brush
in
or
out
by
means
of
its
adjusting
screw
.
With
the
contacts
just
closing
at
No
.
O
time
-
dial
setting
,
there
should
be
sufficient
gap
between
the
stationary
contact
brush
and
its
metal
backing
strip
to
ensure
approximately
1
/
32
inch
wipe
.
The
minimum
current
at
which
the
contacts
will
just
close
is
determined
by
the
tap
setting
in
the
tap
block
at
the
top
of
the
support
structure
,
section
.
See
CHARACTERISTICS
-
11
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
The
pickup
of
the
time
-
overcurrent
unit
for
any
current
tap
setting
is
adjusted
by
means
of
a
spring
-
adjusting
ring
(
see
Figure
1
)
.
The
spring
-
adjusting
ring
either
winds
or
unwinds
the
spiral
control
spring
.
By
turning
the
ring
,
the
operating
current
of
the
unit
may
be
brought
into
agreement
with
the
tap
setting
employed
,
if
this
adjustment
has
been
disturbed
.
This
adjustment
also
permits
any
desired
setting
intermediate
between
the
various
tap
settings
to
be
obtained
.
If
such
adjustment
is
required
,
it
is
recommended
that
the
higher
tap
be
used
.
It
should
be
noted
that
the
relay
will
not
necessarily
agree
with
the
time
-
current
characteristics
of
Figures
9
and
10
if
the
relay
has
been
adjusted
to
pick
up
at
a
value
other
than
tap
value
,
because
the
torque
level
of
the
relay
has
been
changed
.
Time
Setting
The
setting
of
the
time
dial
determines
the
length
of
time
the
unit
requires
to
close
the
contacts
when
the
current
reaches
a
predetermined
value
.
The
contacts
are
just
closed
when
the
time
dial
is
set
on
0
.
When
the
time
dial
is
set
on
10
,
the
disk
must
travel
the
maximum
amount
to
close
the
contacts
and
therefore
this
setting
gives
the
maximum
time
setting
.
The
primary
adjustment
for
the
time
of
operation
of
the
unit
is
made
by
means
of
the
time
dial
.
However
,
further
adjustment
is
obtained
by
moving
the
permanent
(
drag
)
magnet
along
its
supporting
shelf
;
moving
the
magnet
toward
the
disk
and
shaft
decreases
the
time
,
while
moving
it
away
increases
the
time
.
Pickup
Test
Set
the
relay
at
the
0.5
time
-
dial
position
and
the
lowest
tap
.
Using
the
test
connections
in
Figure
14
,
the
main
unit
should
close
the
contacts
within
1
3
%
of
tap
value
current
with
100
%
restraint
voltage
applied
.
Time
Test
Set
the
relay
to
the
10
time
-
dial
position
and
the
lowest
tap
.
With
0
restraint
voltage
,
apply
1.25
times
tap
current
to
the
relay
.
The
relay
operating
time
to
close
its
contact
should
be
between
3.53
and
3.87
seconds
.
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
Make
sure
that
the
instantaneous
unit
link
is
in
the
correct
position
for
the
range
in
which
it
is
to
operate
.
See
internal
connections
diagram
,
Figure
4
,
and
connect
as
indicated
in
the
test
circuit
of
Figure
15
.
Whenever
possible
,
use
the
higher
range
since
the
higher
range
has
a
higher
continuous
rating
.
Setting
the
High
-
Seismic
Instantaneous
Unit
The
instantaneous
unit
has
an
adjustable
core
located
at
the
top
of
the
unit
,
as
shown
in
Figure
1
.
To
set
the
instantaneous
unit
to
a
desired
pickup
,
loosen
the
locknut
and
adjust
the
core
.
Turning
the
core
clockwise
decreases
the
pickup
;
turning
the
core
counterclockwise
increases
the
pickup
.
Bring
up
the
current
slowly
until
the
unit
picks
up
.
It
may
be
necessary
to
repeat
this
operation
,
until
the
desired
pickup
value
is
obtained
.
Once
the
desired
pickup
value
is
reached
,
tighten
the
locknut
.
-
12
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
CAUTION
Refer
to
Table
III
for
the
continuous
and
one
-
second
ratings
of
the
instantaneous
unit
,
the
instantaneous
unit
.
Do
not
exceed
these
ratings
when
applying
current
to
The
range
of
the
instantaneous
unit
(
see
Table
III
)
must
be
obtained
between
a
core
position
of
1
/
8
of
a
turn
of
"
full
clockwise
"
and
20
turns
counterclockwise
from
the
full
-
clockwise
position
,
do
not
leave
the
core
in
the
full
clockwise
position
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
The
target
and
seal
-
in
unit
has
an
operating
coil
tapped
at
0.2
and
2.0
amperes
.
The
relay
is
shipped
from
the
factory
with
the
tap
screw
in
the
higher
ampere
position
.
The
tap
screw
is
the
screw
holding
the
right
-
hand
stationary
contact
.
To
change
the
tap
setting
,
first
remove
one
screw
from
the
left
-
hand
stationary
contact
and
place
it
in
the
desired
tap
.
Next
remove
the
screw
from
the
undesired
tap
and
place
it
on
the
left
-
hand
stationary
contact
,
where
the
first
screw
was
removed
(
see
Figure
1
)
.
This
procedure
is
necessary
to
prevent
the
right
-
hand
stationary
contact
from
getting
out
of
adjustment
.
Screws
should
never
be
left
in
both
taps
at
the
same
time
.
Pickup
and
Dropout
Test
Connect
relay
studs
1
and
2
(
see
the
test
circuit
of
Figure
16
)
to
a
DC
source
,
ammeter
and
load
box
,
so
that
the
current
can
be
controlled
over
a
range
of
0.1
to
2.0
amperes
.
Turn
the
time
dial
to
the
zero
(
0
)
time
-
dial
position
.
1
.
2
.
See
Table
IX
.
Increase
the
current
slowly
until
the
seal
-
in
unit
picks
up
.
Move
the
time
dial
away
from
the
zero
(
0
)
time
-
dial
position
;
the
seal
-
in
unit
should
remain
in
the
picked
-
up
position
.
3
.
4
.
See
Table
IX
.
Decrease
the
current
slowly
until
the
seal
-
in
unit
drops
out
.
5
.
TABLE
IX
Tap
Pickup
Current
Dropout
Current
0.05
or
more
0.50
or
more
0.2
0.12
-
0.20
1.2
-
2.0
2.0
-
13
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
INSTALLATION
The
relay
should
be
installed
in
a
clean
,
dry
location
,
free
from
dust
,
and
well
lighted
to
facilitate
inspection
and
testing
.
The
relay
should
be
mounted
on
a
vertical
surface
.
The
outline
and
panel
drillings
for
semi
-
flush
mounting
are
shown
in
Figure
18
and
those
for
various
methods
of
surface
mounting
are
shown
in
Figure
19
.
The
internal
connection
diagrams
for
the
relays
are
shown
in
Figures
3
and
4
.
Typical
external
connections
are
shown
in
Figures
5
and
6
.
INSTALLATION
TESTS
All
the
tests
described
must
be
performed
at
the
time
of
installation
,
if
those
tests
described
in
the
ACCEPTANCE
TESTS
section
were
not
performed
prior
to
installation
,
it
is
recommended
that
they
be
performed
at
this
time
.
In
addition
,
Induction
Unit
Perform
the
Pickup
Test
as
outlined
in
the
ACCEPTANCE
TESTS
section
.
1
.
Check
the
operating
time
at
some
multiple
of
tap
value
(
this
value
used
is
left
to
the
discretion
of
the
user
)
and
desired
time
-
dial
setting
with
zero
(
0
)
or
100
%
restraint
voltage
.
High
-
Seismic
Instantaneous
Unit
2
,
Select
the
desired
range
by
setting
the
link
in
the
proper
position
.
(
See
Figure
1
and
the
internal
connections
diagram
,
Figure
3
or
4
.
)
Whenever
possible
,
be
sure
to
select
the
higher
range
since
it
has
a
higher
continuous
rating
.
Set
the
instantaneous
unit
to
pick
up
at
the
desired
current
level
.
See
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
in
the
ACCEPTANCE
TESTS
section
.
1
.
2
.
High
-
Seismic
Target
and
Seal
-
in
Unit
1
.
Make
sure
that
the
tap
screw
is
in
the
desired
tap
.
2
.
Perform
Pickup
and
Dropout
Test
as
outlined
in
the
ACCEPTANCE
TESTS
section
.
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
In
view
of
the
vital
role
of
protective
relays
in
the
operation
of
a
power
system
,
it
is
important
that
a
periodic
test
program
be
followed
.
It
is
recognized
that
the
-
14
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
interval
between
periodic
checks
will
vary
depending
upon
environment
,
type
of
relay
,
and
the
user
'
s
experience
with
periodic
testing
,
accumulated
enough
experience
to
select
the
test
interval
best
suited
to
his
individual
requirements
,
it
is
suggested
that
the
points
listed
below
be
checked
at
an
interval
of
from
1
to
2
years
.
Until
the
user
has
These
tests
are
intended
to
insure
that
the
relays
have
not
deviated
from
their
original
settings
.
If
deviations
are
encountered
,
the
relay
must
be
retested
and
serviced
as
described
in
the
SERVICING
section
of
this
manual
.
INDUCTION
UNIT
Perform
pickup
test
as
described
in
the
INSTALLATION
section
for
the
tap
setting
in
service
.
1
.
2
.
Perform
the
time
tests
as
described
in
the
INSTALLATION
section
.
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
1
.
Check
that
the
instantaneous
unit
picks
up
at
the
desired
current
level
,
as
outlined
in
TESTS
section
.
Setting
the
High
-
Seismic
Instantaneous
Unit
in
the
ACCEPTANCE
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
Check
that
the
unit
picks
up
at
the
values
shown
in
Table
IX
.
1
.
2
.
Check
that
the
unit
drops
out
at
25
%
or
more
of
tap
value
.
CONTACT
CLEANING
A
flexible
burnishing
tool
should
be
used
for
cleaning
relay
contacts
.
This
is
a
flexible
strip
of
metal
with
an
etched
-
roughened
surface
,
which
in
effect
resembles
a
superfine
file
.
The
polishing
action
of
this
file
is
so
delicate
that
no
scratches
are
left
on
the
contacts
,
yet
it
cleans
off
any
corrosion
thoroughly
and
rapidly
.
The
flexibility
of
the
tool
insures
the
cleaning
of
the
actual
points
of
contact
.
Relay
contacts
should
never
be
cleaned
with
knives
,
files
,
or
abrasive
paper
or
cloth
.
SYSTEM
TEST
Although
this
instruction
book
is
primarily
written
to
check
and
set
the
IFCV
relay
,
overall
functional
tests
to
check
the
system
operation
are
recommended
at
intervals
based
on
the
customer
'
s
experience
.
-
15
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
SERVICING
INDUCTION
UNIT
If
it
is
found
during
installation
or
periodic
testing
that
the
induction
unit
is
out
of
limits
,
the
unit
may
be
recalibrated
as
follows
:
Mechanical
Adjustment
The
disk
does
not
have
to
be
in
the
exact
center
of
either
air
gap
for
the
relay
to
perform
correctly
,
adjustment
can
be
made
.
Should
the
disk
not
clear
all
gaps
,
however
,
the
following
Determine
which
way
the
disk
must
be
aligned
to
clear
all
gap
surfaces
by
0.010
i
nch
.
1
.
Remove
the
drag
magnet
assembly
by
loosening
the
two
screws
securing
it
to
the
support
structure
.
The
screws
need
not
be
removed
.
Loosen
the
upper
pivot
-
bearing
set
screw
(
1
/
16
inch
hex
wrench
)
slightly
,
so
the
upper
pivot
can
move
freely
.
Do
not
remove
the
set
screw
from
the
support
structure
.
2
.
3
.
Loosen
the
jewel
-
bearing
set
screw
as
in
Step
3
above
.
4
.
5
.
Apply
a
slight
downward
finger
pressure
on
the
upper
pivot
and
turn
the
jewel
-
bearing
screw
,
from
the
underside
of
the
support
structure
,
to
position
the
disk
as
determined
in
Step
1
above
.
6
.
Turn
the
jewel
-
bearing
screw
1
/
8
turn
clockwise
and
tighten
the
upper
pivot
set
screw
to
2.5
-
3.5
inch
-
pounds
of
torque
.
7
.
Turn
the
jewel
-
bearing
screw
1
/
8
turn
counterclockwise
.
This
will
lower
the
disk
and
shaft
assembly
approximately
0.005
inch
and
permit
proper
end
play
.
The
shaft
must
have
0.005
-
0.010
inch
of
end
play
.
8
.
Tighten
the
jewel
-
bearing
set
screw
to
2.5
-
3.5
inch
-
pounds
of
torque
.
9
.
Rotate
the
disk
through
the
electromagnet
gap
.
The
disk
should
clear
the
gap
surfaces
by
0.010
inch
and
be
within
0.005
inch
flatness
.
If
the
disk
is
not
within
0.005
flatness
,
the
disk
should
be
replaced
.
10
.
Reinstall
the
drag
magnet
assembly
and
check
that
the
disk
has
at
least
0.010
inch
clearance
from
the
drag
magnet
assembly
surfaces
.
11
.
Tighten
the
drag
magnet
assembly
mounting
screws
with
7
-
10
inch
-
pounds
of
torque
,
after
securely
seating
the
assembly
and
positioning
it
according
to
the
Time
Setting
and
Time
Test
above
(
see
ACCEPTANCE
TEST
section
)
.
-
16
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
Pickup
Tests
Rotate
the
time
dial
to
the
No
.
0
time
-
dial
setting
and
check
by
means
of
a
lamp
that
the
contacts
just
close
.
The
point
at
which
the
contacts
just
close
can
be
adjusted
by
running
the
stationary
contact
brush
in
or
out
by
means
of
its
adjusting
screw
.
This
screw
should
be
held
securely
in
its
support
.
With
the
contacts
just
closing
at
the
No
.
0
time
setting
,
there
should
be
sufficient
gap
between
the
stationary
contact
brush
and
its
metal
backing
strip
to
ensure
approximately
1
/
32
inch
wipe
.
The
pickup
of
the
unit
for
any
current
tap
setting
is
adjusted
by
means
of
a
spring
-
adjusting
ring
.
By
turning
the
ring
,
the
operating
current
of
the
unit
may
be
brought
into
agreement
with
the
tap
setting
employed
,
if
for
some
reason
this
adjustment
has
been
disturbed
.
This
adjustment
also
permits
any
desired
setting
intermediate
between
the
various
tap
settings
to
be
obtained
.
If
such
adjustment
is
required
,
it
is
recommended
that
the
higher
tap
setting
be
used
.
It
should
be
noted
that
the
relay
will
not
necessarily
agree
with
the
time
current
characteristics
of
Figures
9
and
10
if
the
relay
has
been
adjusted
to
pick
up
at
a
value
other
than
tap
value
,
because
the
torque
level
of
the
relay
has
been
changed
.
Connect
the
operating
coil
terminals
to
a
source
of
the
proper
frequency
and
good
waveform
having
a
voltage
of
110
or
more
,
with
resistance
load
boxes
for
setting
the
current
.
See
Test
Circuit
,
Figure
14
.
Follow
the
The
relay
is
first
set
for
pickup
current
at
0
restraint
volts
,
procedure
below
:
Set
the
tap
block
for
the
lowest
tap
position
.
1
.
Connect
the
relay
as
shown
in
Figure
14
.
With
0
restraint
voltage
,
adjust
the
control
spring
so
that
the
contacts
just
close
at
25
%
of
tap
value
.
It
should
never
be
necessary
to
wind
up
the
control
spring
adjuster
more
than
30
°
(
one
notch
)
or
unwind
it
more
than
1200
(
three
notches
)
from
the
factory
setting
to
obtain
the
above
pickup
setting
.
Now
the
relay
may
be
set
to
pick
up
at
the
particular
value
of
restraint
voltage
shown
below
.
2
.
3
.
Apply
restraint
voltage
,
side
of
power
as
Terminal
5
.
Note
that
Terminal
7
must
be
connected
to
the
same
4
.
Adjust
the
load
box
so
that
tap
value
of
current
is
flowing
in
the
current
circuit
.
5
.
Adjust
the
slide
-
band
resistor
at
the
back
of
the
relay
until
the
contacts
just
close
for
the
restraint
voltage
required
.
6
.
-
17
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
Time
Setting
Set
the
relay
to
the
10
time
-
dial
position
and
the
lowest
tap
.
With
0
restraint
voltage
,
apply
1.25
times
tap
current
to
the
relay
.
The
relay
operating
time
to
close
its
contact
should
not
exceed
the
range
from
3.53
to
3.87
seconds
;
however
,
it
would
be
preferable
to
adjust
the
operating
time
as
near
as
possible
to
3.7
seconds
.
Moving
the
drag
magnet
assembly
toward
the
disk
and
shaft
decreases
the
operating
time
and
moving
the
drag
magnet
assembly
away
from
the
disk
and
shaft
increases
the
operating
time
.
structure
must
be
tight
before
proceeding
with
other
time
checks
.
The
screws
securing
the
drag
magnet
assembly
to
the
support
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
Since
mechanical
adjustments
may
affect
the
Seismic
Fragility
level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
1
.
Both
contacts
should
close
at
the
same
time
.
2
.
The
backing
strip
should
be
so
formed
that
the
forced
end
(
front
)
bears
against
the
molded
strip
under
the
armature
.
With
the
armature
against
the
pole
piece
,
the
cross
member
of
the
"
T
"
spring
should
be
in
a
horizontal
plane
and
there
should
be
at
least
1
/
64
inch
wipe
on
the
contacts
.
front
half
of
the
shaded
pole
with
the
armature
held
closed
,
close
with
feeler
gage
in
place
.
3
.
4
.
Check
this
by
inserting
a
0.010
inch
feeler
gage
between
the
Contacts
should
HIGH
-
SEISMIC
TARGET
AND
SEAT
-
IN
UNIT
Since
mechanical
adjustments
may
affect
the
Seismic
Fragility
level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
Check
Steps
2
and
3
as
described
under
INSTANTANEOUS
UNIT
.
To
check
the
wipe
of
the
seal
-
in
unit
,
insert
a
0.010
inch
feeler
gage
between
the
pastic
residual
of
the
armature
and
the
pole
piece
,
with
the
armature
held
closed
.
Contacts
should
close
with
feeler
gage
in
place
.
RENEWAL
PARTS
It
is
recommended
that
sufficient
quantities
of
renewal
parts
be
carried
in
stock
to
enable
the
prompt
replacement
of
any
that
are
worn
,
broken
or
damaged
.
When
ordering
renewal
parts
,
address
the
nearest
Sales
Office
of
the
General
Electric
Company
,
specifying
quantity
required
,
name
of
the
part
wanted
,
and
the
complete
model
number
of
the
relay
for
which
the
part
is
required
.
-
18
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
LIST
OF
FIGURES
Figure
Page
1
.
IFCV
51
BD
Relay
,
Front
View
20
IFCV
51
BD
Relay
,
Rear
View
2
.
21
IFCV
51
AD
Internal
Connections
3
.
22
IFCV
51
BD
Internal
Connections
4
.
23
External
Connections
5
.
24
6
.
External
Connections
25
Typical
Pickup
Characteristics
7
.
26
8
.
Typical
Phase
-
Angle
Characteristics
Typical
Time
-
Current
Characteristics
Typical
Time
-
Current
Characteristics
H
1
gh
-
Se
1
sm
1
c
Instantaneous
Unit
Transient
Overreach
Characteristics
High
-
Se
1
sm
1
c
Instantaneous
Unit
Time
-
Current
Characteristics
Test
Connections
-
CT
Testing
27
9
.
28
10
.
29
11
.
30
12
.
31
13
.
32
14
.
Test
Connections
-
Induction
Unit
33
15
.
Test
Connections
-
High
-
Seismic
Instantaneous
Unit
Test
Connections
-
H
1
gh
-
Se
1
sm
1
c
Target
and
Seal
-
1
n
Unit
34
16
.
35
17
.
Cross
Section
of
Orawout
Case
Connections
36
18
.
Outline
and
Panel
Drilling
-
Semi
-
Flush
Mounting
Outline
and
Panel
Drilling
-
Surface
Mounting
.
.
.
37
19
.
38
Since
the
last
edition
,
Table
VIII
and
Figures
18
and
19
have
been
changed
.
-
19
-
Courtesy of NationalSwitchgear.com
GEK
-
49946
Tap
Selector
Block
Seal
-
In
Target
Tap
Selector
Screw
Top
Pivot
Time
Overcurrent
Tap
Selector
Seal
-
In
Unit
Stationary
Contact
Instantaneous
Unit
Main
Moving
Contact
Shield
Disk
Seal
-
In
Target
Drag
Magnet
Main
Stationary
Brush
Control
Spring
Adjustment
Ring
and
Contact
Assembly
Figure
1
(
8043510
)
IFCV
51
BD
Relay
,
Removed
from
Case
,
Front
View
-
20
-
Courtesy of NationalSwitchgear.com
This manual suits for next models
1
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