GE IFC57AD User manual

INSTRUCTIONS
GEK
-
49948
A
Supersedes
GEK
-
49948
TIME
OVERCURRENT
RELAYS
TYPES
IFC
57
AD
AND
IFC
57
BD
GENERAL
ELECTRIC
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GEK
-
49948
TABLE
OF
CONTENTS
PAGE
DESCRIPTION
APPLICATION
CONSTRUCTION
RATINGS
TIME
-
OVERCURRENT
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
TARGET
AND
SEAL
IN
UNIT
CONTACTS
BURDENS
CHARACTERISTICS
TIME
-
OVERCURRENT
UNIT
Pickup
Operating
Time
Accuracy
Reset
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMICTARGET
AND
SEAL
-
IN
UNIT
RECEIVING
,
HANDLING
AND
STORAGE
ACCEPTANCE
TESTS
VISUAL
INSPECTION
MECHANICAL
INSPECTION
DRAWOUT
RELAY
TESTING
POWER
REQUIREMENTS
,
GENERAL
TIME
-
OVERCURRENT
UNIT
Time
Setting
Pickup
Test
Time
Test
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
Setting
the
High
-
Seismic
Instantaneous
Unit
HIGH
-
SEISMICTARGET
ANDSEAL
-
IN
UNIT
Pickup
and
Dropout
Test
3
3
4
5
5
6
7
7
7
8
8
8
8
9
9
9
9
9
10
10
10
10
11
11
11
11
12
12
12
12
INSTALLATION
INSTALLATION
TESTS
Time
-
Overcurrent
Units
High
-
Seismic
Target
and
Seal
-
In
Unit
High
-
Seismic
Instantaneous
Unit
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
TIME
-
OVERCURRENT
UNIT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMICTARGET
ANDSEAL
-
IN
UNIT
.
CONTACT
CLEANING
COVER
CLEANING
SYSTEM
TEST
SERVICING
TIME
-
OVERCURRENT
UNIT
Pickup
Test
Time
Tests
MECHANICAL
ADJUSTMENT
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
HIGH
-
SEISMIC
AND
SEAL
-
IN
UNIT
RENEWAL
PARTS
LIST
OF
FIGURES
13
13
13
13
14
14
14
14
14
14
15
15
15
15
15
16
16
17
17
18
19
2
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GEK
-
49948
TIME
OVERCURRENT
RELAYS
TYPES
IFC
57
D
AND
IFC
57
BD
DESCRIPTION
The
type
-
IFC
57
AD
relays
covered
by
these
instructions
are
extended
-
range
,
single
-
phase
time
-
overcurrent
relays
having
a
medium
-
time
inverse
characteristic
.
type
-
IFC
57
BD
relays
are
similar
except
that
they
include
,
in
addition
,
a
hinged
-
armature
instantaneous
overcurrent
unit
that
provides
instantaneous
tripping
at
high
current
levels
when
that
feature
is
desired
,
and
the
instantaneous
-
overcurrent
unit
are
described
in
detail
in
the
section
on
CONSTRUCTION
.
Both
relays
are
equipped
with
a
dual
-
rated
target
and
seal
-
in
unit
.
The
Both
the
time
-
overcurrent
unit
In
addition
to
the
contacts
that
are
normally
provided
for
tripping
,
each
of
the
relays
is
provided
with
contacts
that
may
be
used
for
alarm
,
remote
indication
,
or
other
purposes
deemed
suitable
by
the
user
.
Note
that
the
contacts
associated
with
the
target
and
seal
-
in
unit
will
operate
only
after
the
time
-
overcurrent
unit
contacts
close
to
draw
trip
current
,
hence
they
are
not
reliable
for
use
as
tripping
contacts
.
See
the
internal
and
external
connections
for
the
exact
contact
arrangement
used
in
each
of
the
relays
,
Figures
3
,
4
,
and
7
.
When
semiflush
mounted
on
a
suitable
panel
,
these
relays
have
a
high
seismic
capability
,
including
both
the
target
/
seal
-
in
unit
and
the
instantaneous
overcurrent
unit
when
it
is
supplied
.
Also
,
these
relays
are
recognized
under
the
Components
Program
of
Underwriters
Laboratories
,
Inc
.
The
relays
are
mounted
in
a
size
-
Cl
drawout
case
of
molded
construction
.
The
outline
and
panel
drilling
are
shown
in
Figures
16
and
17
.
The
relay
internal
connections
are
shown
in
Figure
3
for
the
IFC
57
AD
and
in
Figure
4
for
the
IFC
57
BD
.
APPLICATION
Time
overcurrent
relays
find
extensive
general
use
in
the
protection
of
utility
and
industrial
power
-
distribution
systems
and
frequently
as
overload
back
-
up
protection
at
other
locations
.
The
medium
-
time
inverse
characteristic
of
the
IAC
57
relays
is
particularly
useful
as
back
-
up
ground
-
fault
protection
in
low
-
and
medium
-
voltage
industrial
systems
when
the
relay
is
connected
to
a
current
transformer
in
the
neutral
of
a
power
transformer
or
a
generator
.
Typical
external
connections
for
such
an
application
are
shown
in
Figure
7
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
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
,
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
3
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GEK
-
49948
When
setting
these
relays
to
coordinate
with
downstream
relays
,
a
coordination
time
of
from
0.25
to
0.40
second
is
generally
allowed
,
depending
on
the
clearing
time
of
the
breaker
involved
.
These
coordination
times
include
,
in
addition
to
breaker
clearing
time
,
0.10
second
for
relay
overtravel
and
0.17
second
for
safety
factor
.
example
,
if
the
breaker
clearing
time
is
0.13
second
(
eight
cycles
)
,
the
coordination
time
would
be
0.40
second
(
0.13
+
0.10
+
0.17
)
.
For
If
the
relay
time
is
set
by
test
at
the
current
level
in
question
,
the
safety
factor
may
be
reduced
to
0.07
second
.
Then
if
the
downstream
breaker
time
is
five
(
5
)
cycles
(
0.08
second
)
a
minimum
of
0.25
second
(
0.08
+
0.10
+
0.07
)
could
be
allowed
for
coordination
.
If
relay
coordination
times
are
marginal
or
impossible
to
obtain
,
use
the
relay
overtravel
curves
of
Figure
8
to
refine
the
relay
settings
,
relay
-
operating
time
necessary
to
just
match
the
operating
time
of
the
downstream
relay
with
which
coordination
is
desired
.
Determine
the
multiple
of
pickup
and
the
necessary
time
-
dial
setting
to
provide
this
relay
-
operating
time
,
approximate
curve
of
Figure
8
to
determine
the
overtravel
time
in
percent
of
operating
time
and
convert
this
into
real
time
.
Add
this
time
to
the
breaker
time
,
the
safety
factor
time
,
and
the
original
relay
-
operating
time
to
determine
the
final
relay
-
operating
time
required
.
Set
the
relay
to
this
value
.
First
determine
the
Use
the
In
the
ground
-
fault
back
-
up
application
it
is
not
customary
to
use
the
instantaneous
unit
.
On
other
applications
where
an
instantaneous
unit
is
needed
,
it
must
be
realized
that
this
unit
has
a
transient
overreach
characteristic
,
as
illustrated
in
Figure
9
.
This
is
the
result
of
the
DC
offset
that
is
usually
present
in
.
the
current
at
the
inception
of
a
fault
.
When
determining
the
pickup
setting
for
this
unit
,
the
transient
overreach
must
be
taken
into
consideration
.
The
percent
transient
overreach
should
be
applied
to
proportionately
reduce
the
calculated
pickup
setting
so
that
the
instantaneous
unit
will
not
overreach
a
downstream
device
and
thereby
cause
a
loss
of
coordination
in
the
system
protection
scheme
.
The
operating
-
time
characteristics
of
this
unit
are
shown
in
Figure
10
.
CONSTRUCTION
The
IFC
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
,
2
,
and
15
.
Figure
2
shows
the
induction
unit
mounted
to
the
molded
support
structure
.
This
disk
is
activated
by
a
current
-
operating
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
the
proper
contact
-
closing
current
.
The
disk
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
15
,
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
.
Next
,
current
-
circuit
fingers
on
the
case
connection
block
engage
the
shorting
bar
(
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
current
-
circuit
contact
fingers
on
the
case
,
and
finally
those
on
the
relay
support
structure
,
to
completely
de
-
energize
the
drawout
element
.
4
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GEK
-
49948
There
is
a
High
-
Seismic
target
and
seal
-
in
unit
on
the
front
to
the
left
of
the
shaft
of
the
time
-
overcurrent
unit
,
see
Figure
1
.
electrically
separate
contacts
,
one
of
which
is
in
series
with
its
coil
and
in
parallel
with
the
contacts
of
the
time
-
overcurrent
unit
such
that
when
the
induction
unit
contacts
close
,
the
seal
-
in
unit
picks
up
and
seals
in
.
seal
-
in
unit
picks
up
,
it
raises
a
target
into
view
that
latches
up
and
remains
exposed
until
released
by
pressing
a
reset
button
located
on
the
upper
left
side
of
the
cover
.
The
seal
-
in
unit
has
two
When
the
The
IFC
"
B
"
model
relays
contain
,
in
addition
to
the
above
,
a
High
-
Seismic
instantaneous
unit
,
see
Figure
1
.
The
instantaneous
unit
is
a
small
hinged
-
type
unit
with
electrically
separate
contacts
,
and
is
mounted
on
the
front
,
to
the
right
of
the
shaft
of
the
time
-
overcurrent
unit
.
One
of
its
contacts
is
normally
connected
in
parallel
with
the
contacts
of
the
time
-
overcurrent
unit
and
its
coil
is
connected
in
series
with
the
time
-
overcurrent
unit
.
When
the
instantaneous
unit
picks
up
it
raises
a
target
that
latches
up
and
remains
exposed
until
it
is
released
.
The
same
rest
button
that
releases
the
target
seal
-
in
unit
also
releases
the
target
of
the
instantaneous
unit
.
A
magnetic
shield
,
depicted
in
Figure
1
,
is
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
.
The
Seismic
Fragility
Level
exceeds
peak
axial
acceleration
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
°
to
+
55
°
C
.
TIME
-
OVERCURRENT
UNIT
Ranges
for
the
time
-
overcurrent
unit
are
shown
in
Table
I
.
TABLE
I
CURRENT
RANGE
(
AMPERES
)
FREQUENCY
(
HERTZ
)
RELAY
0.5
-
1.0
-
12.0
4.0
50
and
60
IFC
57
AD
and
BD
Available
taps
for
the
time
-
overcurrent
unit
are
shown
in
Table
II
.
TABLE
II
TAPS
AVAILABLE
(
AMPERES
)
RANGE
(
AMPERES
)
0.5
,
0.6
,
0.7
,
0.8
,
1.0
,
1.2
,
1.5
,
2.0
,
2.5
,
3.0
,
4.0
0.5
-
4.0
1.0
,
1.2
,
1.5
,
2.0
,
2.5
,
3.0
,
4.0
,
5.0
,
6.0
,
7.0
,
8.0
,
10.0
,
12.0
1
12
5
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GEK
-
49948
The
one
-
second
thermal
ratings
are
listed
in
Table
III
.
TABLE
III
TIME
-
OVERCURRENT
UNIT
(
AMPERES
)
0
NE
-
SEC
0
N
0
RATING
,
ANY
TAP
(
AMPERES
)
MODEL
K
128
0.5
-
4.0
16
,
384
IFC
57
1.0
-
12.0
260
67
,
600
Ratings
less
than
one
second
may
be
calculated
according
to
the
formula
I
=
VK
/
T
,
where
T
is
the
time
in
seconds
that
the
current
flows
.
The
continuous
ratings
for
the
time
-
overcurrent
unit
are
shown
in
Tables
IV
and
V
.
TABLE
IV
0.5
-
4.0
AMPERE
RANGE
RATINGS
MODEL
IFC
57
0.5
,
0.6
,
0.7
,
0.8
,
1.0
,
1.2
,
1.5
,
2.0
,
2.5
,
3.0
,
4.0
TAP
CONT
.
CURR
.
2.3
,
2.5
,
2.6
,
2.9
,
3.3
,
3.6
,
4.1
,
4.7
,
5.3
,
5.8
,
6.8
TABLE
V
1.0
-
12.0
AMPERE
RANGE
RATINGS
MODEL
IFC
57
1.0
,
1.2
,
1.5
,
2.0
,
2.5
,
3.0
,
4.0
,
5.0
,
6.0
,
TAP
8.0
,
10.0
,
12.0
7.0
,
CONT
.
CURR
.
3.9
,
4.3
,
4.8
,
5.3
,
6.2
,
6.8
,
7.8
,
8.8
,
9.7
,
10.4
,
11.1
,
12.4
,
13.6
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
(
IFC
57
BD
)
The
instantaneous
coil
is
tapped
for
operation
at
either
one
of
two
ranges
(
H
or
The
position
of
the
link
located
on
the
top
of
the
support
structure
determines
whether
the
range
is
high
or
low
.
See
Figure
2
and
Table
VI
.
L
)
.
TABLE
VI
HIGH
-
SEISMIC
INSTANTANEOUS
LINK
UNIT
(
AMPS
)
POSITION
CONTINUOUS
RATING
(
AMPS
)
ft
ttfONE
-
SECOND
RATING
(
AMPS
)
RANGE
(
AMPS
)
K
2
-
50
2
-
1 0
10
-
50
130
16
,
900
L
3.7
H
7.5
6
-
150
6
-
3 0
3 0
-
150
10.2
67
,
600
L
260
19.6
H
ft
The
range
is
approximate
,
which
means
that
the
2
-
10
,
10
-
50
may
be
2
-
8
,
8
-
50
.
There
will
always
be
at
least
one
ampere
overlap
between
the
maximum
L
and
the
minimum
H
setting
.
Whenever
possible
,
be
sure
to
select
the
higher
range
in
order
to
obtain
the
higher
continuous
and
short
-
time
ratings
,
fft
Higher
currents
may
be
applied
for
shorter
lengths
of
time
in
accordance
with
the
formula
:
I
=
VK
/
T
6
Courtesy of NationalSwitchgear.com

GEK
-
49948
Since
the
instantaneous
-
unit coil is
in
series
with
the
time
-
overcurrent
-
unit coil
,
see
Tables
III
,
IV
,
V
and
VI
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
VII
.
TABLE
VII
TAP
0.2
2.0
DC
Resistance
+
10
%
(
Ohms
)
8.0
0.24
Minimum
Operating
(
Amp
)
+
0
-
60
%
0.2
2.0
Carry
Continuous
(
Amperes
)
0.3 3
Carry
30
Amps
for
(
Seconds
)
0.03
4
Carry
10
Amps
for
(
Seconds
)
30
0.25
60
Hertz
Impedance
(
Ohms
)
0.73
68.6
If
the
tripping
current
exceeds
30
amperes
anauxiliary relay
should
be
used
,
the
connections
beinf
such 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
Burdens
for
the
time
-
overcurrent
unit
are
given
in
Table
VIII
.
TABLE
VIII
Burdens
in
Ohms
(
2
)
Times
Pickup
Burdens
at
Min
.
Pickup
Min
.
Tap
(
Ohms
)
Min
HZ
Range
Model
Tap
10
20
Amps
R
Jx
Z
3
2.27
7.18
7.35
3.89
1.68
1.12
gQ
0.5
-
4.0
0.5
0.43
1.69
1.75
0.93
0.43
0.31
1.0
-
12.0 1.0
IFC
57
2.72
8.62
9.04 4.67
2.01
1.34
gQ
0.5
-
4.0
0.5
1.0
-
12.0
1.0
0.52
2.03
2.10
1.12
0.52
0.37
7
Courtesy of NationalSwitchgear.com

GEK
-
49948
NOTE
:
The
impedance
values
given
are
those
for
minimum
tap
of
each
range
;
the
impedance
for
other
taps
at
pickup
current
(
tap
rating
)
varies
inversely
,
(
approximately
)
as
the
square
of
the
tap
rating
,
example
,
an
IFC
57
60
hertz
relay
with
0.5
impedance
of
9.04
ohms
on
the
0.5
amp
tap
.
amp
tap
is
(
0.5
/
2.0
)
?
«
9.04
=
0.565
ohms
.
For
-
4.0
amp
range
has
an
The
impedance
of
the
2.0
The
High
-
Seismic
instantaneous
unit
burdens
(
IFC
57
BD
)
are
listed
in
Table
IX
.
TABLE
IX
High
-
Seismic
Inst
.
Unit
Hz
(
Amps
Burdens
at
Min
.
Pickup
Min
.
Tap
(
Ohms
)
Burdens
in
Ohms
(
Z
)
Times
Pickup
Min
.
Pickup
(
Amps
)
Link
Range
Position
(
Amps
)
10
R
JX
20
Z
3
2
-
1 0
2
0.750
0.650
0.992
0.634
0.480
0.457
L
2
-
5 0
6 0
H
10
-
50
10
0.070
0.024
0.074
0.072
0.071
0.070
L
6
-
30
0.110
0.078
0.135
0.095
0.081
0.079
6
6
-
150
60
H
30
-
150
30
0.022
0.005
0.023
0.022
0.022
0.022
2
-
1 0
L
0.625
0.542
0.827
0.528
0.400 0.380
2
2
-
5 0 5 0
H
10
-
50
10
0.058 0.020
0.062
0.060
0.059
0.058
6
-
3 0
0.092
0.065
0.112
0.079
0.068
0.066
L
6
6
-
150
50
H
30
-
150
30
0.018
0.004
0.019
0.018 0.018
0.018
CHARACTERISTICS
TIME
-
OVERCURRENT
UNIT
Pickup
Pickup
on
these
relays
is
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
is
marked
A
through
N
.
See
the
name
plate
on
the
relay
for
its
tap
settings
.
Example
:
The
two
-
amp
(
2
amp
)
tap
for
a
l
-
to
-
12
IFC
57
time
-
overcurrent
relay
requires
one
movable
lead
in
position
B
and
the
other
in
position
L
.
Operating
-
Time
Accuracy
The
IFC
relays
should
operate
within
±
7
%
of
the
published
time
curve
.
Figures
5
and
6
show
the
various
time
-
current
characteristics
for
the
IFC
relays
.
The
setting
of
the
time
dial
determines
the
length
of
the
time
required
to
close
the
contacts
for
a
given
current
.
The
higher
the
time
-
dial
setting
,
the
longer
the
operating
time
.
8
Courtesy of NationalSwitchgear.com

GEK
-
49948
The
maximum
time
The
contacts
are
just
closed
when
the
time
dial
is
set
to
zero
,
setting
occurs
when
the
time
-
dial
is
set
to
10
and
the
disk
has
to
travel
its
maximum
distance
to
close
the
contacts
.
Reset
Reset
times
are
The
unit
resets
at
90
%
of
the
minimum
closing
current
,
proportionate
to
the
time
-
dial
settings
.
The
time
to
reset
to
the
number
10
time
-
dial
position
when
the
current
is
reduced
to
zero
is
approximately
60
seconds
for
the
IFC
57
relays
.
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
(
IFC
57
BD
)
There
are
high
and
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
,
shown
in
Figure
10
.
The
time
-
current
curve
for
the
instantaneous
unit
is
See
Figure
1
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
The
target
and
seal
-
in
unit
has
two
(
2
)
tap
selections
located
on
the
front
of
the
unit
.
See
Figure
1
.
RECEIVING
,
HANDLING
AND
STORAGE
These
relays
,
when
not
included
as
a
part
of
a
control
panel
,
will
be
shipped
in
cartons
designed
to
protect
them
against
damage
.
Immediately
upon
receipt
of
a
relay
,
examine
it
for
any
damage
sustained
in
transit
.
If
injury
or
damage
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
.
Reasonable
care
should
be
exercised
in
unpacking
the
relay
in
order
that
none
of
the
parts
are
injured
nor
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
may
find
its
way
inside
when
the
cover
is
removed
and
cause
trouble
in
the
operation
of
the
relay
.
ACCEPTANCE
TESTS
Immediately
upon
receipt
of
the
relay
an
INSPECTION
and
ACCEPTANCE
TEST
should
be
made
to
make
sure
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
.
If
the
examination
or
test
indicates
that
These
tests
may
be
performed
as
part
of
the
installation
or
as
acceptance
tests
,
at
the
discretion
of
the
user
.
Since
most
operating
companies
use
different
procedures
for
acceptance
tests
and
for
installation
tests
,
the
following
section
includes
all
applicable
tests
that
may
be
performed
on
these
relays
.
9
Courtesy of NationalSwitchgear.com

GEK
-
49948
VISUAL
INSPECTION
Check
the
nameplate
to
make
sure
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
.
2
.
Make
sure
the
control
tangled
or
touching
.
spring
is
not
deformed
,
nor
its
convolutions
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
instantaneous
-
unit
contacts
(
see
SERVICING
section
for
seal
-
in
unit
)
.
4
.
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
.
5
.
6
.
CAUTION
Should
there
be
a
need
to
tighten
any
screws
,
to
prevent
stripping
.
DO
NOT
OVER
TIGHTEN
.
DRAWOUT
RELAY
TESTING
IFC
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
the
external
circuitry
,
which
provides
maximum
flexibility
,
but
requires
reasonable
care
since
a
CT
shorting
jumper
is
necessary
when
testing
the
relay
.
The
test
probes
are
different
in
the
number
of
connections
that
can
be
made
.
The
12
XCA
28
A
1
has
a
full
complement
of
28
connections
and
the
12
XCA
11
A
1
has
four
.
Refer
to
instruction
book
GEK
-
49803
for
additional
information
POWER
REQUIREMENTS
.
GENERAL
All
devices
operating
on
alternating
current
(
AC
)
are
affected
by
frequency
.
Since
non
-
sinusoidal
waveforms
can
be
analyzed
as
a
fundamental
frequency
plus
harmonics
of
that
fundamental
frequency
,
it
follows
that
alternating
-
current
devices
(
relays
)
will
be
affected
by
applied
waveforms
.
AC
relays
(
and
AC
devices
in
general
)
are
significantly
affected
by
the
application
of
non
-
sinusoidal
waveforms
.
Therefore
,
in
order
to
test
AC
relays
properly
it
is
essential
to
use
a
test
voltage
and
/
or
current
waveform
that
is
sinusoidal
.
The
purity
of
the
sine
wave
10
Courtesy of NationalSwitchgear.com

GEK
-
49948
its
freedom
from
harmonics
)
cannot
be
expressed
as
a
finite
number
for
any
(
i
.
e
particular
relay
;
however
,
any
relay
using
tuned
circuits
,
RL
or
RC
networks
,
or
saturating
electromagnets
(
such
as
time
-
overcurrent
relays
)
would
be
especially
affected
by
non
-
sinusoidal
wave
forms
.
•
)
TIME
-
OVERCURRENT
UNIT
Rotate
the
time
dial
slowly
and
check
,
by
means
of
a
lamp
in
the
circuit
,
that
the
contacts
just
close
at
the
zero
(
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
.
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
minimum
current
at
which
the
contacts
will
close
is
determined
by
the
tap
setting
in
the
tap
block
at
the
top
of
the
support
structure
.
See
CHARACTERISTICS
section
.
The
pickup
of
the
time
-
overcurrent
tap
setting
is
adjusted
by
means
of
a
spring
-
adjusted
ring
.
See
Figure
1
.
The
spring
-
adjusted
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
.
between
the
various
tap
settings
to
be
obtained
,
it
is
recommended
that
the
higher
tap
be
used
,
will
not
necessarily
agree
with
the
time
/
current
characteristics
of
Figure
5
and
6
,
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
.
This
adjustment
also
permits
any
desired
setting
intermediate
If
such
adjustment
is
required
,
It
should
be
noted
that
the
relay
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
zero
(
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
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
Using
the
test
Set
the
relay
at
the
0.5
time
-
dial
position
and
the
lowest
tap
.
connections
in
Figure
12
the
main
unit
should
close
the
contacts
within
±
3
%
of
tap
-
value
current
for
60
hertz
relays
,
and
within
±
7.5
%
of
tap
-
value
current
for
50
hertz
relays
.
Time
Test
Set
the
relay
at
the
No
.
5
time
-
dial
setting
and
the
lowest
tap
.
Using
the
test
connection
in
Figure
12
,
apply
five
times
(
5
*
)
tap
current
to
the
relay
.
The
relay
operating
times
to
close
its
contact
are
listed
in
Table
X
.
11
Courtesy of NationalSwitchgear.com

GEK
-
49948
TABLE
X
TIME
(
SECONDS
)
MAXIMUM
RELAY
Hz
MINIMUM
IFC
57
60
9.35 9.65
9.15
50
9.85
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
(
IFC
57
BD
)
Make
sure
that
the
instantaneous
unit
is
in
the
correct
position
for
the
range
in
which
it
is
to
operate
.
See
the
internal
-
connection
diagram
,
Figure
4
,
and
connect
as
indicated
in
the
test
circuit
of
Figure
13
.
Whenever
possible
use
the
higher
range
,
since
the
higher
range
has
a
higher
continuous
rating
.
Setting
the
High
-
Seismic
Instantaneous
Unit
The
instant
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
necessary
to
repeat
this
operation
,
until
the
desired
pickup
value
is
obtained
.
Once
the
desired
pickup
value
is
reached
,
tighten
the
locknut
.
CAUTION
Refer
to
Table
VI
for
the
continuous
and
one
-
second
(
1
sec
)
ratings
of
the
instantaneous
unit
.
Do
not
exceed
these
ratings
when
applying
current
to
the
instantaneous
unit
The
range
of
the
instantaneous
unit
(
See
Table
VI
)
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
1
.
Connect
relay
studs
1
and
2
(
See
the
test
circuit
of
Figure
14
)
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
.
2
.
Turn
the
time
dial
to
the
ZERO
time
-
dial
position
.
12
Courtesy of NationalSwitchgear.com

GEK
-
49948
See
Table
Increase
the
current
slowly
until
the
seal
-
in
unit
picks
up
.
3
.
XI
.
Move
the
time
dial
away
from
the
ZERO
time
-
dial
position
;
the
seal
-
in
unit
should
remain
in
the
picked
up
position
.
4
.
See
Table
Decrease
the
current
slowly
until
the
seal
-
in
unit
drops
out
.
5
.
XI
.
Table
XI
DROPOUT
CURRENT
PICKUP
CURRENT
TAP
0.12
-
0.20
0.05
or
more
0.2
1.2
-
2.0
0.50
or
more
2.0
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
are
shown
in
Figures
16
and
17
.
Figure
16
shows
the
semi
-
flush
mounting
,
and
Figure
17
shows
various
methods
of
surface
mounting
.
The
internal
-
connection
diagrams
for
the
relay
are
shown
in
Figures
3
and
4
.
Typical
external
connections
are
shown
in
Figure
7
.
INSTALLATION
TESTS
The
following
tests
are
to
be
performed
at
the
time
of
installation
:
Time
-
Overcurrent
Units
Set
the
tap
block
to
the
desired
tap
setting
and
the
time
dial
to
the
0.5
position
.
Using
the
test
circuit
in
Figure
12
,
gradually
apply
current
until
the
contacts
just
close
.
This
value
of
current
is
defined
as
pickup
and
should
be
within
3
%
of
tap
value
for
60
hertz
relays
,
and
within
7.5
%
of
tap
value
for
50
hertz
relays
.
Check
the
operating
time
at
some
multiple
of
tap
value
and
the
desired
time
-
dial
setting
.
This
multiple
of
tap
value
may
be
five
times
(
5
*
)
tap
rating
,
or
the
maximum
fault
current
for
which
the
relay
must
coordinate
.
The
value
used
is
left
to
the
discretion
of
the
user
.
High
-
Seismic
Target
and
Seal
-
In
Unit
Make
sure
that
the
tap
screw
is
in
the
desired
tap
.
Perform
pickup
and
dropout
tests
as
outlined
in
the
ACCEPTANCE
TESTS
section
.
1
.
2
.
13
Courtesy of NationalSwitchgear.com

GEK
-
49948
High
-
Seismic
Instantaneous
Unit
(
IFC
57
BD
)
Select
the
desired
range
by
setting
the
link
in
the
proper
position
.
(
See
Figure
1
and
the
internal
-
connections
diagram
)
.
Whenever
possible
,
be
sure
to
select
the
higher
range
,
since
it
has
a
higher
continuous
rating
.
1
.
2
.
Set
the
instantaneous
unit
to
pick
up
at
the
desired
current
level
.
See
Setting
the
High
-
Seismic
Instantaneous
Unit
in
the
ACCEPTANCE
TESTS
section
.
All
the
tests
described
above
under
INSTALLATION
TESTS
must
be
performed
at
the
time
of
installation
.
TESTS
section
were
not
performed
prior
to
installation
,
it
is
recommended
they
be
performed
at
this
time
.
In
addition
,
if
those
tests
described
under
the
ACCEPTANCE
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
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
one
to
two
years
.
Until
the
user
has
These
tests
are
intended
to
make
sure
that
the
relays
have
not
deviated
from
their
original
settings
.
If
deviations
are
encountered
,
the
relay
must
be
retested
and
serviced
as
described
in
this
manual
.
TIME
-
OVERCURRENT
UNIT
1
.
Perform
pickup
test
for
the
tap
setting
in
service
,
as
described
in
the
INSTALLATION
section
.
2
.
Perform
the
time
tests
,
as
described
in
the
INSTALLATION
section
.
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
(
IFC
57
BD
)
1
.
Check
that
the
instantaneous
unit
picks
up
at
the
desired
current
level
,
as
outlined
in
the
ACCEPTANCE
TESTS
section
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
1
.
Check
that
the
unit
picks
up
at
the
values
shown
in
Table
XI
.
Check
that
the
unit
drops
out
at
25
%
or
more
of
tap
value
.
2
.
CONTACT
CLEANING
For
cleaning
relay
contacts
,
a
flexible
burnishing
tool
should
be
used
,
consists
of
a
flexible
strip
of
metal
with
an
etch
-
roughened
surface
,
resembling
in
effect
a
superfine
file
.
The
polishing
action
is
so
delicate
that
no
scratches
are
left
,
yet
it
will
clean
off
any
corrosion
thoroughly
and
rapidly
.
Its
flexibility
This
14
Courtesy of NationalSwitchgear.com

GEK
-
49948
Do
not
use
knives
,
files
,
ensures
the
cleaning
of
the
actual
points
of
contact
,
abrasive
paper
or
cloth
of
any
kind
to
clean
relay
contacts
.
*
C
0
VER
CLEANING
The
clear
Lexan
®
cover
should
be
cleaned
with
a
soft
cloth
and
water
only
,
cleaning
solutions
should
be
used
.
Use
of
cleaning
solutions
may
damage
the
clear
cover
.
No
®
Lexan
is
a
registered
trademark
of
the
General
Electric
Company
SYSTEM
TEST
Although
this
instruction
book
is
primarily
written
to
check
and
set
the
IFC
relay
,
overall
functional
tests
to
check
the
system
operation
are
recommended
,
at
intervals
based
on
the
customer
'
s
experience
.
SERVICING
TIME
OVERCURRENT
UNIT
If
it
is
found
during
installation
or
periodic
testing
that
the
time
-
overcurrent
unit
is
out
of
limits
,
the
unit
may
be
recalibrated
as
follows
:
Pickup
Test
Rotate
time
dial
to
No
.
0
time
-
dial
setting
and
check
,
by
means
of
a
lamp
in
the
circuit
,
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
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
5
and
6
,
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
12
.
With
the
tap
block
set
for
the
lowest
tap
and
the
time
dial
set
where
contacts
are
just
open
,
adjust
the
control
spring
to
just
close
the
contacts
within
the
limits
Revised
since
last
issue
15
Courtesy of NationalSwitchgear.com

GEK
-
49948
given
below
,
which
are
±
1
%
of
the
tap
amps
.
See
Table
XII
.
TABLE
XII
TAP
RANGE
TAP
MIN
.
AMPS
MAX
.
AMPS
0.5
-
4
0.495
0.5
0.505
1.0
-
12.0
1.0
0.99
1.01
It
should
never
be
necessary
to
wind
up
the
control
-
spring
adjuster
more
than
30
°
(
one
notch
)
,
nor
unwind
it
more
than
120
°
(
three
notches
)
from
the
factory
setting
,
to
obtain
the
above
pickup
setting
.
Time
Tests
With
the
tap
block
set
for
the
lowest
tap
and
the
time
dial
at
No
.
5
setting
,
apply
five
times
(
5
*
)
tap
current
to
the
relay
.
Adjust
the
position
of
the
drag
magnet
assembly
to
obtain
an
operating
time
as
near
as
possible
to
9.50
but
at
least
within
the
range
listed
in
Table
XIII
.
TABLE
XIII
TIME
(
SECONDS
)
RELAY
MINIMUM
MAXIMUM
IFC
57
9.4
9.6
The
drag
-
magnet
assembly
should
be
approximately
in
the
middle
of
its
travel
.
The
drag
-
magnet
assembly
is
adjusted
by
loosening
the
two
screws
securing
it
to
the
support
structure
.
See
Figure
1
.
Moving
the
drag
magnet
towards
the
disk
and
shaft
decreases
the
operating
time
,
and
moving
the
drag
magnet
away
from
the
disk
and
shaft
increases
the
operating
time
.
The
screws
securing
the
drag
magnet
assembly
to
the
support
structure
must
be
tight
before
proceeding
with
other
time
checks
.
MECHANICAL
ADJUSTMENT
The
disk
does
not
have
to
be
in
the
exact
center
of
either
air
gap
for
the
relay
to
perform
correctly
.
Should
the
disk
not
clear
all
gaps
,
the
following
adjustment
can
be
made
.
1
.
Determine
which
way
the
disk
must
be
aligned
to
clear
all
gap
surfaces
by
0.010
inches
.
2
.
Remove
the
drag
-
magnet
assembly
,
by
loosening
the
two
screws
securing
it
to
the
support
structure
.
The
screw
need
not
be
removed
.
Loosen
slightly
the
upper
pivot
-
bearing
set
screw
(
1
/
16
inch
hex
wrench
)
,
so
the
upper
pivot
can
move
freely
.
Do
not
remove
the
set
screw
from
the
support
structure
.
3
.
Loosen
the
jewel
-
bearing
set
screw
as
in
3
above
.
4
.
16
Courtesy of NationalSwitchgear.com

GEK
-
49948
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
1
above
.
5
.
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
.
6
.
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
.
7
.
Tighten
the
jewel
-
bearing
set
screw
to
2.5
-
3.5
inch
pounds
of
torque
.
8
.
The
disk
should
clear
the
If
the
9
.
Rotate
the
disk
through
the
electromagnet
gap
.
gap
surfaces
by
0.010
inch
and
be
within
0.005
inch
flatness
,
disk
is
not
within
0.005
inch
flatness
,
the
disk
should
be
replaced
.
Reinstall
the
drag
magnet
assembly
and
check
that
the
disk
has
at
least
0.010
inch
clearance
from
the
drag
-
magnet
-
assembly
surfaces
.
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
test
above
.
10
.
11
.
HIGH
-
SEISMIC
INSTANTANEOUS
UNIT
(
IFC
57
BD
)
Both
contacts
should
close
at
the
same
time
.
1
.
The
backing
strip
should
be
so
formed
that
the
forked
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
.
Check
this
by
inserting
a
0.010
inch
feeler
gage
between
the
front
half
of
the
shaded
pole
and
the
armature
,
with
the
armature
held
closed
.
The
contacts
should
close
with
the
feeler
gage
in
place
.
Since
mechanical
adjustments
may
affect
the
seismic
fragility
level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
2
.
3
.
4
.
HIGH
-
SEISMIC
TARGET
AND
SEAL
-
IN
UNIT
The
left
contact
must
make
before
the
right
contact
To
check
the
wipe
of
the
seal
-
in
unit
,
insert
a
feeler
gage
between
the
residual
button
of
the
armature
and
the
front
end
of
the
pole
piece
,
should
close
with
a
0.015
±
0.002
feeler
gage
,
and
the
right
contact
with
a
0.010
±
0.002
feeler
gage
.
Since
mechanical
adjustments
may
affect
the
seismic
fragility
level
,
it
is
advised
that
no
mechanical
adjustments
be
made
if
seismic
capability
is
of
concern
.
The
left
contact
17
Courtesy of NationalSwitchgear.com

GEK
-
49948
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
,
specify
the
quantity
required
,
the
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
-
49948
LIST
OF
FIGURES
Page
Figure
20
Type
IFC
57
BD
Relay
,
Removed
from
Case
,
Front
View
.
.
Type
IFC
57
BD
Relay
,
Removed
from
Case
,
Rear
View
.
.
.
Internal
Connections
for
Relay
Type
IFC
57
AD
,
Front
View
1
21
2
22
3
Internal
Connections
for
Relay
Type
IFC
57
BD
,
Front
View
23
4
60
Hertz
Time
/
Current
Characteristics
for
Relay
Types
IFC
57
AD
and
IFC
57
BD
5
24
50
Hertz
Time
/
Current
Characteristics
for
Relay
Types
IFC
57
AD
and
IFC
57
BD
6
25
26
External
Connections
for
IFC
57
AD
or
IFC
57
BD
Relay
7
27
Overtravel
Curves
for
Relay
Type
IFC
57
8
Transient
Overreach
Characteristics
of
the
High
-
Seismic
Instantaneous
Unit
9
28
29
Time
/
Current
Characteristics
of
the
High
-
Seismic
Instantaneous
Unit
Test
Connections
for
Testing
CT
Secondary
Used
with
the
IFC
Relay
Test
Connections
for
Testing
Pickup
and
Operating
Times
of
the
IFC
Relay
Time
-
Overcurrent
Unit
10
30
11
12
31
Test
Connections
for
Testing
Pickup
and
Operating
Times
of
the
IFC
Relay
High
-
Seismic
Instantaneous
Unit
Test
Connections
for
Testing
the
High
-
Seismic
Target
and
Seal
-
In
Unit
Used
with
the
IFC
Relay
13
32
14
33
34
Cross
Section
of
IFC
Drawout
Case
Showing
Shorting
Bar
Outline
and
Panel
Drilling
for
Semi
-
Flushing
Mounting
of
Relay
Type
IFC
57
Outline
and
Panel
Drilling
for
Surface
Mounting
of
Relay
Type
IFC
57
15
16
35
36
17
Revised
since
last
issue
19
Courtesy of NationalSwitchgear.com

GEK
-
49948
TIME
OVERCURRENT
TAP
SELECTORS
TAP
SELECTOR
BLOCK
INSTANTANEOUS
UNIT
RANGE
SELECTION
LINK
TOP
PIVOT
INSTANTANEOUS
UNIT
ADJUSTABLE
CORE
INSTANTANEOUS
UNIT
SEAL
-
IN
TARGET
TAP
SELECTOR
SCREW
SEAL
-
IN
UNIT
STATIONARY
CONTACT
*
V
0
9
/
t
TIME
DIAL
MAIN
MOVING
|
CONTACT
MAIN
STATIONARY
_
BRUSH
AND
CONTACT
ASSEMBLY
TIME
INST
r
SEAL
-
IN
TARGET
t
>
t
N
!
R
A f
i
f
r
T
i t
!
;
;
'
s
/
N
1
!
V
.
SHIELD
k
y
7
j
DRAG
MAGNET
4
ASSEMBLY
CONTROL
-
SPRING
ADJUSTING
RING
f j
¥
i
m
Figure
1
(
8043009
)
Type
IFC
57
BD
Relay
,
Removed
from
Case
,
Front
View
20
Courtesy of NationalSwitchgear.com