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