GE IFC51A AND 518 User manual
GEK--45375
CONTENTS
DESCRIPTION
•.••.•.•......•..••.•.•.••
,
••..•••.•.•...•.•
3
APPLICATION
•.••.•.•.•..••..•.•..••.•......•.•..•.•.•.•.
3
CONSTRUCTION
...........................................
4
RATINGS
•..•.•••.••..•...••.••......•••••...•••...••••••
5
TIME
OVERCURRENT
UN
IT
..............................
5
HI-SEISMIC
INSTANTANEOUS
UNIT
.•••.•.•...•....•..•..
6
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
•..•••••••.•.•••.
7
CONTACTS
...........................................
7
BURDENS
.••.•••••••.••••.•••...•••.•.•.•••••••••.••••.••
7
CHARACTERISTICS
, . .
••••••••••.•
, • . . .8
TIME
OVERCURRENT
UNIT.
. • . • . 8
PICKUP
.•••..•..•.•.•..•.•.•
8
OPERATING
TIME
ACCURACY
. . . . .
.•••..•
8
RESET
• • • • . • . • • . • • . .
.•••.••
8
HI-SEISMIC
INSTANTANEOUS
UNIT
.•••.•.•..•
9
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
•.•••...•
9
RECEIVING,
HANDLING
AND
STORAGE
••.•••...•.•••..••..••.•
9
ACCEPTANCE
TESTS
......................................
,9
VISUAL
INSPECTION
..................................
9
MECHANICAL
INSPECTION
..............................
9
DRAWOUT
RELAY
TESTING
..................................
10
POtiER
REQUIREMENTS
GENERAL.
........................
10
TIME
OVERCURRENT
UNIT
..............................
10
TIME
SETTING
••.••••••••••.•.••.••..••..••....••.
10
PICKUP
TEST
.•••..••.••...••..•...••..••..••....•
10
TIME
TEST
.......................................
11
HI-SEISMIC
INSTANTANEOUS
UNIT
......................
11
SETTING
THE
HI-SEISMIC
INSTANTANEOUS
UNIT
.......
11
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
.................
l'I
PICKUP
AND
DROPOUT
TEST
.
.11
INSTALLATION
••..••••.•.••.••..•..•
12
INSTALLATION
TESTS
..••••..•.••..•••
12
TI
ME
OVERCURRENT
UNIT
• • . . . • . . • . . •
12
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
......•
12
HI-SEISMIC
INSTANTANEOUS
UNIT
••••.•.••
12
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
......•..•...•••
12
TIME
OVERCURRENT
UNIT
..............................
13
HI-SEISMIC
INSTANTANEOUS
UNIT
......................
13
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
.•••.•..••..•.•••
13
CONTACT
CLEANING
...................................
13
SYS
Tm
TEST
.•...•••.•.•••.••.•..•..••...••..••..•..
13
SERVICING
.....................................
,
........
13
TIME
OVERCURRENT
UNIT
..............................
13
PICKUP
TESTS
•.•.•.•.•.•...•..•.•..•...•••..•...•
13
TIME
TESTS
......................................
14
MECHANICAL
ADJUSTMENT
•••••••••••••••••••••••••••
14
HI-SEISMIC
INSTANTANEOUS
UNIT
••••..•.•••...•••.••••
14
Ill-SEISMIC
TARGET
AND
SEAL-IN
UNIT
.................
15
RENEWAL
PARTS
•..•••••.••••••••••.••..•.••••••••••••••.•
15
LIST
OF
FIGURES
••..•••.••••••.•••..•.•••••••
,
•••••••••..
35
2.
\.
Courtesy of NationalSwitchgear.com
(
()
'
,_
..
_,,,
GEK-45375
TIME
OVERCURRENT
RELAYS
TYPES
IFC
51A
and
51B
IFC
53A
and
538
IFC
77A
and
778
jlESc_RIPT~ON
The
type I
FC
re1ays covered
by
these
instructions
are extended range,
single
phase,
ti
me
overcurrent
relays.
The
various
time-current
characteristics
available
are
as
follov.1s:
IFC51
A,
I
FC51B
!FC53A,
I
FC53B
I
FC77
A,
I
FC77B
Inverse time
Very
inverse
time
Extremely
inverse
time
The
IFC51B,
538
and
77B
relays
also
include a hinged-armature instantaneous
overcurrent
unit
which
provides
instantaneous
tripping
at
high
current
levels.
The
instantaneous
unit
is
not included in the
IFC51A,
53A
or
77A
relays.
Both
the time
overcurrent
unit
and
the instantaneous
overcurrent
unit
are
described
in
detail
in
the
section
on
CONSTRUCTION.
F.ach
relay
is
equipped with a dual
rated
target
and
seal-in
unit.
When
semi
flush
mounted
on
a
suitable
panel,
these
relays
have a high seismic
capability
including
both the
tar~et
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
relay
is
mounted in a
size
Cl
drawout case
of
molded
construction.
The
outline
and
panel
drilling
are
shown
in Figures
23
and
24.
The
relay
internal
connections are
shown
in
Fi~ure
4
for
the
IFC51A,
IFC53A
and
IFC77A,
and
in
Figure 5
for
the
IFC51B,
IFC538
and
IFC778.
AP£)-
I
CATION
Time
overcurrent
relays
are used
extensively
for
the
protection
of
utility
and
industrial
power
dis-
tribution
systems and
frequently
for
over.load backup
protection
at
other
locations.
The
EXTREMELY
INVERSE
time
characteristics,
Figure 8
and
22,
of
the
IFC77A
and
IFC778
relays
are designed
primarily
for
use where
they
are
required
to coordinate
rather
closely
with
power
fuses,
distribution
cutouts
and
reclosers.
They
also
provide
maximum
tolerance
to allow
for
cold load pickup. This
is
the
result
of
an
extended
service
outage which
results
in a heavy accumu'lation of loads
of
automatically
contro'lled devices such as
refri~e
rators,
vrnter
heaters,
water
pumps,
oil
burners,
etc.
Such
load accumulations
often
produce inrush
cur-
rents
considerably in excess of feeder
full
load
current
for
a
short
time
after
the feeder
is
energized.
The
EXTREMELY
INVERSE
time
characteristic
often
permits successful pickup
of
these loads
and
at
the
same
time provides adequate
fault
protection.
The
VERY
INVERSE
time
characteristics,
Figure 7
and
2·1,
of
the
IFC53A
and
IFC538
relays
are
likely
to provide
faster
overall
protection
in
applications
where the
available
fault
current
magnitude remains
fairly
constant
due
to a
relatively
constant
generating
capacity.
The
variation
in the magnitude
of
fau'lt
current
thru
the
relay
is
therefore
mainly dependent
upon
the 'location
of
the
fault
with
respect
to the
re-
lay.
The
INVERSE
time
overcurrent
characteristics,
Figure 6
and
20, of .the
IFC51A
and
IFC51B
relays
tend
to
make
the
relay
operating
time
less
dependent
upon
the magnitude
of
the
fault
current
than in the case of
VERY
INVERSE
and
EXTREMELY
INVERSE
devices. For
this
reason,
INVERSE
type
relays
are 'likely to provide
faster
overall
protection
in
applications
where the
available
fault
current
magnitudes vary
significantly
as
a
result
of
frequent
changes in the source impedance
due
to system loading
and
switching.
The
usual
application
of
these
relays
requires
three
relays
for
multiphase
fault
protection,
one
per
phase,
and
a
separate
relay
residually
connected
for
single-phase-to-ground
faults.
Ty
pi
cal
external
connections
for
this
application
are
shown
in Figure 9.
Use
of
a
separate
ground relay
is
advantageous
because
it
can
be
set
to provide
more
sensitive
protection
against
ground
faults.
In
the
application
of
these
relays
with downstream automatic
reclosing
devices, the
relay
reset
time
should
be
considered. This
is
the time required
for
the
relay
to
go
from
the
contacts
fully
closed
posit-
ion to the
fully
open
position
when
set
at
the
number
10
time
dial.
At
lower time
dial
settings
the
reset
times
are
proportionately
lower.
The
reset
time
of
all
VERY
INVERSE
and
EXTREMELY
INVERSE
relays
is
appro-
ximately
60
seconds.
The
reset
time
of
all
INVERSE
re.lays covered
by
these
instructions
is
approximately
7 seconds.
'1.'hese
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation,
operation
or
maintenance.
Shoul.d
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
descr.ibed
herein
meet
applicable
ANSI,
.TEEE
and
NEMA
standards;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly.
3
Courtesy of NationalSwitchgear.com
GEK-45375
Vlhen
setting
these relays
to
coordinate
1;1th
downstream
relays,
a coordination time
of
from
0.25
()
to 0.40 seconds
is
generally allowed,
depend·inq
on
the
clearing
time
of
the breaker invo·lved. These
coordination
t·imes
include, in addition to breaker clear·ing time, 0.10 seconds for relay overtravel
and
0.17 seconds
for
safety
factor.
For
examp"le,
if
the breaker c'learing time
is
0.13 seconds
(8
cycles),
the coordination time
1<ould
be
0.40 seconds (0.13+0.l0+0.17).
If
the relay time
is
set
by
test
at
the
current
level in
question,
the
safety
factor
may
be
reduced to 0.07 seconds.
Then
H the
downstream
breaker time
is
5 cycles (0.08 seconds) a
minimum
of
0.25 seconds (0.08+0.10+0.07) could
be
allowed for coordination.
If
relay coordination times are maroinal
or
impossible to
obtain,
use the
relay overtravel curves
of
Figures 10,
ll
or
12
to
refine
the
relay
settings.
First
determine the relay
operating time necessary to
just
match
the operating time
of
the downstream
relay
with
which
coordination
is
desired. Determine the mu'ltiple
of
pickup
and
the necessary time dial
setting
to provide
this
relay
operating time.
Use
the appropriate curve
of
Figure 10,
11
or
12
to determine the overtravel time in
percent
of
operating
t·ime
and
convert
this
itlto real time.
Add
this
time to the breaker time
and
the
safety
factor
time
and
the
original
relay
operating time to determine the
final
relay
operating time
re-
quired. Set the relay to
this
value.
Once
the
current
in the relay operating coil
is
cut
off
the
relay
contacts
wi"ll
open
in approximately
six cycles (O. l second) with
normal
adjustment
of
contact wipe. This permits the
use
of the
relay
in
conjunct·ion with instantaneous reclosing
schemes
without
risk
of
a
false
retrip
when
the
circuit
breaker
is
reclosed
on
a
circuit
from
v1hich
a
fault
has
just
been
cleared.
The
instantaneous overcurrent
unit
present in the I
FC51
B,
I
FC53B
and
I
FC77B
re1
ays
has a trans
·i
ent
overreach
characteristic
as
illustrated
in Figure
13.
This
is
the
result
of
the
DC
offset
that
is
usuall~
present in the
line
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
app"lied 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
sho'-m
in Fioure 14.
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
,2,3
and
19.
Figures 2
and
3
show
the induction
unit
mounted
to the
molded
support
structure.
This disk
is
activated
by
a
current
operating
coil
mounted
on
either
a laminated
EE
or
U-Magnet.
The
disk
and
shaft
assembly
carries
a
moving
contact
wh·ich"
completes the alarm
or
trip
circuit
·1vhen
it
touches a
stationary
contact.
The
disk assembly
is
restrained
by
a
spiral
spring to give the proper contact closing
current.
Its
rota-
tion
is
retarded
by
a permanent
magnet
mounted
in a
molded
housing
on
the support
structure.
The
drav1out
connect·ion/test system for the
Cl
case,
shown
in Figure 19,
has
provisions for
14
connec-
tion
points,
and
a
visible
CT
shorting
bar located
up
front.
As
th~
connection plug
i~
wi~hdr~vm?
it
clears
the
shorter
contact fingers in the output contact
circuits
f·1rst. Thus, the
trip
c1rcu1t
1s
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.
There
is
a Hi-Seismic
target
and
seal-in
unit
mounted
on
the
front
to the
left
of
the
shaft
of
the time overcurrent
unit,
see Figure 1.
The
sea·l··in
unit
has
its
coil in
series
and
its
contacts 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.
When
the
seal-in
unit
picks up,
it
raises
a
target
into
view
which
latches
up
and
remains exposed
until
released
by
pressing a
reset
button located
on
the upper
left
side
of
the cover.
The
!FC
"B"
model
re.lays in addition
to
the
above
contain a Hi-Seismic instantaneous un'it, see
Figure 1.
The
instantaneous
unit
is
a small hinged type
unit
which
is
mounted
on
the
front
to
the
right
of
the
shaft
of
the time overcurrent
unit.
Its
contacts are 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
which
latche~
up
~nd
remains exposed
until
it
is
released.
The
same
reset
button
that
releases
the
target
seal-in
urnt
also
releases
the
target
of
the instantaneous un'it.
Amaqnetic shie.ld, depicted in Figure
1,
is
mounted
t?
~he
support
structure
of inverse
and
very
inverse time overcurrent
IFC
relays,
to eliminate the proximity
affect
of
external magnetic
materials.
Courtesy of NationalSwitchgear.com
(~)
GEK-45375
Both
the
Hi
-Seismic
target
and
sea1-in
unit
and
the
Hi
-Seismic instantaneous unit
have
the
letters
"Hi-G"
molded
into
their
target
blocks to distinguish
them
as Hi-Seismic
units.
Seismic
Fragility
Level
exceeds
peak
axial
acceleration
of 'IOg's(4g
~PA)
when
tested
us·ing
a biaxial multi-frequency input motion
to produce a Required
Response
Spectra
(RRSJ
'in accordance with the
IEEE
Proposed
Guide
for Seismic Te.st-
·ing
of
Relays,
P501,
May,
1977.
RATINGS
The
relays are designed for operation
in
an
ambient
air
temperature
from
-20°C
to
+55°C.
Ranges
for the time overcurrent unit are
shown
in Table
l.
TABLE
l
---
-,-----··
I Current
Range
,
(Amperes
J
Available taps for the time overcurrent
unit
are
shown
in Table
2.
1
Taps
Available
·----"'(A"'"ll)E_eres)
-------------
0.5 -4.0
0.5,
0.6,
0.7,
0.8,
1.0,
l
.2,
l
.5,
2.0,
2.5,
3.0,
4.0
l -
12
____
l~~:-·
1.5,
2.0, 2.5,
3,0,
4.0,
5,0,
6.0,
7.0,
8.0,
10.0, 12.0
The
one
second thermal
ratings
are
listed
in Table
3.
JABLE
3
----
--·---------
Model
Time
Overcurrent Unit
One
!----··--
__
.{_Amperes
L_
__
,_,_
__
IFC51
0.5 -4.0
1------+---'lcc·
~o
__
-_,_,12,.,.'""o
____
._
IFC53
0.5 -4.0
-i.O
-12.0
IFC77
0.
5 -4
.o
,__
_____
j___,l..&..::_1.,.9
___
.____
--·
5
..
_
Sec7nd
Rati
nq
Any
Tap
K
Amoe.res)
128
16384
260
67fi00
-
HQ
19600
260
67600
84
7056
---
220
4849_()_
Courtesy of NationalSwitchgear.com
GEK-45375
Ratings
less
than
one
second
may
be
ca'lculated
accord'lng
to
the formula I =
.JK/f',
where T
is
the
time
·in
seconds
that
the
current
flows.
The
continuous
ratings
for
the time
overcurrent
unit
are
shown
·in
Tables 4
and
5.
TAB1f~.
0.5
-4.0
Ampere
Range
Ratings
-
·------------Tan-
--
-IFC51
--
I
FC53
-IFCT[_::-
-
0.5 0.6
1.
6
1.8
3.8
4.0
-2.5
2~7-
----
'----·-·-
Hl-S.EISMIC
.INSTANTANEOUS
UNIT
------,---
I
0.7 0.8
1.0 1.2 1.5 2.0 '
2.0
2. 1
2.3
·>-2.
7
3.0
3.5
-
-
4.2
4.4
4.7
5.0 5.3
5:s·
j_JL_
3.2
3.6, -
4.0
4.5
r;--;-r-
TAB
LU
1.0
-12.0
Ampere
Range
Ratings
----··--
'
3.0 '
4.0
,4,5
5.0
6.'6 7. 1
6.5 7.5
The
instantaneous
coil
is
tapped
for
operation
on
either
one
of
two
ranges
(Hor
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
F·igure 2
and
Table 6.
Hi-Seismic Link
_*___
Continuous
r-;,;-On;;~-
lnstantaneous
Pos
'iti
on
Range
Rating : Second K
~-n-i
t
__
(_Am_ps_)
_
__;____
_
___
(A_m_p~)
_(
__
A_m_ps_J
___
__,\~~~~m=t~~·
~.~~>----------
! L
2-10
3.7·
i
130
I.
.
-------•
2 -
50
16 ,900
1 H
__
10
-
50
7.
5
6 -
15;-f
___
L_
__6
_::__~-
-~--l~O.~~-~~~+-j-2-60·-+-·--67-,-60-0-·-----j
_________
_J
___
H
____
3_0_-_1_
s_o-'--~~
\
*The
range
is
approximate, which
means
that
the
2-JO, 10-50
may
be
2-8,
8··50. There
will
always
be
at
least
one ampere
overlap
between
the
maximum
L
setting
and
the
m'lnimum
H
setting.
Whenever
possible,
always
select
the
higher
range,
since
it
has
the
higher
continuous
rating.
**Higher
currents
may
be
applied
for
shorter
lengths
of
time in accordance with
the
formula:
I •
fKtf
6
Courtesy of NationalSwitchgear.com
GEK-45375
f.) 5
_ Since the instantaneous unit co'il
is
in·
series
with the time overcurrent
unit
co'il see Tables 3 4
and
6 to determine the current l·imitinq element
for
both continuous
and
short time
ratings.
' '
)il:SEJSMIL_JARGET
AN_ll
SEAL-IN
_UNIT
Ratings for the
target
and
seal-in
un"it
are
shown
in Table 7.
JABLE
7
8.0
.
--1
0.24
0.2
2.o
o::r--
--3-
-
0.03
4
--
o.25
30
<
871>
u
·'
·'
If
the
tripping
current
exceeds
30
amperes
an
aux'i"liary
re"lay
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.
The
current-closing
rating
of
the contacts
is
30
amperes
for voltages not exceeding
250
volts.
The
current
carrying
rating
is
limited
by
the
ratings
of the seal
·in
unit.
BURDENS
Burdens
for the time overcurrent
unit
are
given in Table 8.
MODEL
HZ
--r~-·-··~-----~----------·---------·--r
RANGE
Min
Tap
Burdens
at
Min.
Pickup
Min.
Tap
(Ohms)
7
Burdens
in
Ohms
(Z)
Times
Pickup
I
I
Courtesy of NationalSwitchgear.com
GEK-45375
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, (approximate"ly) as the square
of
the tap
rating.
For
example,
an
IFC77
60Hz
relay with
0.5
-4.0
amp
range
has
an
impedance
of
2.82
ohms
on
the 0.5
:.mp
tap.
The
impedance
of
the 2.0
amp
tap
·is
(0.5/2.0)2
X2.82 = 0.176
ohms.
The
Hi-Seismic instantaneous
unit
burdens are l"isted in Table 9.
TABLE
Jl
Hi
Hz
Link
Range
Min
Burdens
at
Min.
Bu.rdens-
ln
Seismic
Inst.
Uni·
_(Amos)
2-50
6-150
2-50
6-150
"---·-
TIME
OVERC.URRENT
UNIT_
Pickup
Position
60
I
H
___
...._
J.__b_
__
60
H
L
50
H
·-· L
50
H
(Amps)
Pickup
P"ickup
(Ohms)
(Amps)
--·····J•
•
R X ·
I
?-~
? 0.750 0.650
10-50
10
0.070 0.024
6-30 _ 6
___
,_Q_,JlQ
_ 0.078
..
30-,.50
30
0.022 0.005
2-10 2 0.625 0.542
10-50
10
0.058 0.020
6-30
6 0.092 0.065
30-150_
30
0.018 0.004
CHARACTERISTJ(}_
Ohms
(Z)
.. -
...
Iime.s..
'i!;]\.yJL.,_
___
z
3_
10
i
20
i
0.992 0.634 0.480 0.457
0.074_
0.072 0.071 0.070
0.1]Ji
~.0~2
. Q
.081
0.079
0.023 0.022
O.Q.s2
0.022
0.827 0.528 0.400 0.380
0.062 0.060 0.059 0.058
o.
112
0.079 0.068 0.066
0.019 0.018 0.018 0.018
Pickup in 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
which
connect to the tap block
at
the top
of
the support
structure,
see Figure 1.
The
tap block
is
marked
A through
J,
A through M
or
A through
N.
See
the nameplate
on
the
relay
for
tap
settings.
Example:
The
2
amp
tap for a 1
to
12
IFC77
time overcurrent
relay
requires
one
movable
lead in
position
D
and
the
other
in
position
H.
.Qperating
Time
Accur3.£)1_
The
IFC
relays should operate within
±7%
or±
the time dial
setting
times 0.010 seconds, whichever
is
I l
greater,
of
the published time curve. Figures 6-8
and
20-22
show
the various time-current
characteristics
( '
for
the
IFC
relays.
The
setting
of
the time dial determines the length
of
time required to
close
the con-
\,)
tacts
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 zero.
The
maximum
time
setting
occurs
when
the time dial
is
set
to
10
and
the 'disk
has
to
travel
its
maximum
distance to close the
contacts.
Res.tl_
The
unit
resets
at
90%
of
the
m"inimum
closing .current. Reset times are proportionate to the time
di a1
settings.
The
time to
reset
to the
number
1O time
di
a1 pasi
ti
on
when
the current
is
reduced to zero
is
approximately
60
seconds
for
the
1FC53
and
77
relays.
The
IFC51
relay
will
reset
in approximately 7
seconds
from
the
same
number
10
time
dial.
8
g·<~
\;;#
Courtesy of NationalSwitchgear.com
()
GEK-45375
HI-SE
I
SM!
C
INSTANTANEOUS
UNIT
The
instantaneous un'it
has
a
25
to l range
1vith
a tapped
coil.
There are high
and
low
ranges,
selected
by
means
of
a
link
located
on
the top
of
the support
structure.
See
Fiqure
l.
The
time-
current
curve
for
the instantaneous unit
is
shown
in
Figure 14.
··
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
The
target
and
seal-in
unit
has
two
tap
selections
located
on
the
front
of
the
unit.
see Figure
l.
REC_fJ.\l.!l!_(i_,_Jl.ANDLING
AND
STOR_l\.GE
These
relays,
when
not included
as
a
part
of
a control panel, l'rill
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 Electr'ic
Apparatus Sales Office.
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
may
find
its
way
inside
when
the cover
is
removed
and
cause trouble in the operation of
the
relay.
ACCEPTAN_c:E
TESTS_
Immediately
upon
receipt
of
the
relay
an
INSPECTION
AND
ACCEPTANCE
TEST
sh.ould
be
made
to ·insure
that
no
damage
has
been
sustained in shipment
and
that
the
relay
ca'librations
have
not
been
disturbed.
If
the examination
or
test
ind·icates
that
readjustment
is
necessary,
refer
to the section
on
SERVICING.
These
tests
may
be
performed
as
part
of
the
installation
or
acceptance
tests
at
the
discretion
of the user.
Since
most
operating companies use
different
procedures for acceptance
and
installation
tests,
the following
section
includes
all
applicable
tests
that
may
be
performed
on
these
relays.
VISUAL
INSPECTION
Check
the nameplate to ·insure
that
the
mode'I
number
and
ratino
of
the relay agree •1ith 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 contral spring
is
not deformed nor
its
convo
lutians tangled or touching.
3.
The
armature
and
contacts
of
the
seal-in
unit
as
well as the armature
and
contacts
of
the
instantaneous un'it should
move
freely
when
operated
by
hand, there should
be
at
least
1/64"
wipe
on
the
seal-in
and
the instantaneous
contacts.
4.
The
targets
in the sea
1-i
n
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.
5.
Make
sure
that
the brushes
and
shorting bars agree •rith the ·internal connections d·iagram.
6.
CAUTION:
Should there
be
a
need
to
tighten
any
screws,
DO
NOT
OVER
TIGHTEN
to prevent
stripping.
9
Courtesy of NationalSwitchgear.com
QRA\i_OUT
RELAY
.JESTIN§__
The
I
FC
relays
may
be
tested
without
removing
them
from
the
pane
1
by
using the l
2XCA11A1
four
point
test
probes.
The
12XCA11Al
four point
test
probe
makes
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
CT
circuit
may
also
be
tested
by
usfog
an
ammeter
instead of the jumper.
See
the
test
circuit
in Figure
15.
fOIJ[R
REC)IJIREMENTS
G_ENERAL
All
alternating
current operated devices are affected
by
frequency, Since non-sinusoidal
()
waveforms
can
be
analyzed
as
a
fundamenta·1
frequency plus harmonics of the fundamental frequency,
it
('"".".·
follows
that
alternating
current devices (relays) will
be
affected
by
the applied
waveform.
!'•
.
_,,..
Therefore, in order
,to
properly
test
alternating
current relays
it
is
essential
to
use
a
sine
wave
of
current
and/or vo'ltage.
The
purity of the
sine
wave
(i.e.,
its
freedom
from
harmonics)
cannot
be
expressed
as
a
finite
number
for
any
particular
relay,
however,
any
relay using tuned
ci
rcu'its,
R-L
or
RC
networks, or
saturating
e1ectromagnets (such
as
time overcurrent re1ays)
wou·1
d
be
essentially
affected
by
non-sinusoidal
waveforms.
Hence
a resistance limited
circuit,
as
shown
in
Fiqures 16-18,
is
recommended.
llJ:1E
OVER~YRRENl_YNIT
Rotate the time dial slowly
and
check
by
means
of a
lamp
that
the contacts
just
c·lose
at
the zero
time dial
setting
.
.
The
point
at
wnicn
the contacts
just
close
can
be
adjusted
by
running the
stationary
contact brush
in or out
by
means
of
its
adjusting screw.
~iith
the contacts
just
closing
at
No.
O time
setting,
there should
be
sufficient
gap
between the
stationary
contact brush
and
its
metal backing
strip
to insure approximately 1/32" wipe.
The
minimum
current
at
which
the contacts
will
just
close
is
determ·ined
by
the tap
setting
in the
tap block
at
the top
of
the support
structure.
See
Characteristic
section.
The
pickup of the time overcurrent un'it 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
re
qui
red,
it
is
recommended
that
the higher tap
be
used.
It
should
be
noted
that
the re1
ay
11il
1 not
necessar·ily agree with the time current
characteristics
of .Figures 6-8
and
20-22,
if
the relay
has
been
adjusted to
p·i
ckup
at
a
va
1
ue
other than tap
va
1ue, because the torque
1eve1
of the re1
av
has
been
changed.
~11
Time
Setting \
·\·1
The
setting
of the time dial determines the length of time the unit requires to close the contacts U
when
the current reaches a predetermined value.
The
contacts are
just
closed
when
the time dial
is
set
on
O.
When
the time dial
is
set
on
10, the disk
must
travel the
maximum
amount
to close the contacts
and
therefore
this
sett'ing gives the
maximum
time
setting.
The
primary adjustment
for
the time
of
operation of the unH
is
made
by
means
of
the time
dial.
However,
further
adjustment
is
obta·i
ned
by
moving
the permanent
magnet
a1
ong
its
supporting she1
f;
moving
the
magnet
toward
the disk
and
shaft
decreases the time, while
moving
it
away
increases the time.
Pi
ck
up_
Test_
Set the relay
at
0.5 time dial position
and
the lm;est tap.
Using
the
test
connections in Figure 16(:'1
the
ma·in
unit should close the contacts within
±3%
of
tap value current for
60
Hz
relays
and
within lliii
±7.5%
of tap value
current
for
50
Hz
relays.
10
Courtesy of NationalSwitchgear.com
GEK-45375
f)
.UEllL
Test
()
Set the relay
at
No.
5 time dial
setting
and
the lowest tap.
Using
the
test
connection in Figure
16
apply five times tap current to the relay.
The
relay operating times to close
its
contact
is
listed
in Table 10.
,--·
;
Relay
r
IFC51
IFC53
IFC77
HI-SEISMIC
INSTANTANEOUS
UNIT
Hz
--.---:N~~-
(seconds)
-T
Min.
Max.
'
50
and
60
50
and
60
·50
and
_60·
~------·--,
1.75
1.81
i
1.28,__
__
·
-'-'1.'-"3-'-4-
0.
89
0.95
Make
sure
that
the instantaneous unit
link
is
in the
correct
position for the range in
which
it
is
to operate.
See
the Internal Connections
Diagram
Figure 5
and
connect
as
indicated
in
the
test
circuit
of Figure 17.
Whenever
poss ib1e
use
the higher range si
nee
the higher range
has
higher continuous
rating.
Setting
The
Hi-Seismic lnstantanepus Unit
The
instantaneous unit
has
an
adjustable core located
at
the top of the unH
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.
()
CAUTION
-Refer to Table 6 for the continuous
and
one
second
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
6)
must
be
obtained
between
a core position
of
1/8
of a turn
of
full
clockwise
and
20
turns counterclockwise
from
the
full
c"lockwise
position.
Do
not
leave the core in the
full
clockwise
position.
ll.!::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.
£.i_ckup
And
Dropout Test
1. Connect relay studs 1
and
2
(See
the
test
circuit
of Figure
18)
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.
3. Increase the current slowly until the
seal-in
unit picks
up.
See
Table 11.
4.
Move
the
t·ime
dial
away
from
the
ZERO
TIME
DIAL
position,
the
seal-in
unit should remain in the
picked
up
position.
5. Decrease the current slowly until the sea·l-in unit drops out.
See
Table
ll.
11
Courtesy of NationalSwitchgear.com
TAP
0.2
GEK-45375
PICK-UP
CURRENT
0.12 -0.20
DROP-OUT
CURRENT
.05
or
more
2.0 1.2 -2.0 .50 or
more
I I
--.
-··-------------~
~
INSTALLATION
The
relay should
be
installed
in a clean, dry
location,
free
from
dust,
and
>Jell
lighted
to
facilitate
inspection
and
testing.
The
relay should
be
mounted
on
a
vertical
surface.
The
outline
and
panel
drillfogs
are
shown
in
Figures
23
and
24. Figure
23
shows
the semi-flush mounting
and
Figure
24
shows
various
methods
of
surface
mounting.
The
internal
connection
di
a
grams
for the relays are
shown
in Figures 4
and
5. Typical external
connections
are
shown
in Figure 9.
The
following
tests
are to
be
performed
at
the time of
installation:
Time
Overcurrent Unit
Set the tap block to the desired tap
setting
and
the time dial to the 0.5
position.
Using
the
test
circuit
in Figure
16
gradually apply
current
until the contacts
just
close. This value
of
current
is
defined
as
pickup
and
should
be
within three percent of tap value for
60
Hz
relays
and
within 7.5 percent
of tap value for
50
Hz
relays.
Check
the operating
time·
at
some
multiple of tap value
and
the desired time dial
setting.
multiple of tap value
may
be
five times tap
rating
or the
maximum
fault
current
for
which
the
coordinate. This value used
is
left
to the
discretion
of
the user.
Hi-Se_ismic
Target
and
Seal-In Unit
1.
Make
sure
that
the tap
screw
is
in the desired tap.
2.
Perform pickup
and
drop out
tests
as
outlined in the Acceptance Test Section.
~i-Seismic
Instantaneous
Uni~
This
relay
must
l.
Select the desired range
by
setting
the
link
in the proper posit·ion.
{See
F·igure
·1
and
the
Internal Connections Diagram).
Whenever
possible
always
select
the higher range since ·it
has
higher continuous
rating.
2.
Set the instantaneous unit to pick
up
at
the desired current 'level.
See
"Setting the
Instant-
aneous
Unit" in the "Acceptance Test Section".
All
the
tests
described
above
under
Installation
Tests
must
be
performed
at
the time of
install~
ation.
In
addition,
if
those
tests
described under the "Acceptance Tests Sect'lo.n"
were
not performed
prior
to
installatfon,
it
is
recommended
they
be
performed
at
this
time.
f_ERIODJC
CHE~KS
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
re'lay
and
the
user's
experience with periodic
testing.
Until the user
has
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
interva'I of
from
one
to
two
:years.
12
IP':!.,;
~-
j''
11"1
v
Courtesy of NationalSwitchgear.com
()
GEK-45375
These
tests
are intended
to
insure
that
the
relays
have not deviated
from
their
original
setting.
If
deviations
are encountered the
relay
must
be
retested
and
serviced
as
described in
this
manual.
l.
Perform pickup
test
as
described in the
"Installation
Section"
for
the tap
settin~
in
service.
2. Perform the time
tests
as
described 'in the
"Installatfon
Section".
HI-SEISM)C
INSl_'_!\!iTANEOUS
Ufil_l
·1.
Check
that
the instantaneous
unit
picks
up
at
the des-ired
current
level,
as
outlined
in the
"Acceptance Test
Section".
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
1.
Check
that
the
unit
picks
up
at
the values
shown
in Table
ll.
2.
Check
that
the
unit
drops out
at
25%
or
more
of tap value.
CONTACT
CLEANING
For
cleaning
relay
contacts,
a
flexible
burnishing tool should
be
used. This
consists
of
a flex··
ible
strip
of
metal with
an
etched-roughened
surface
resembl'ing in
effect
a
superfine
file.
The
polishing
action
is
so
delicate
that
no
scratches
are
left,
yet
it
•till
clean
off
any
corrosion
thoroughly
and
rapidly.
Its
flexibility
insures
the cleaning of the actual points
of
contact.
Do
not
use knives,
files,
abrasive
paper or c1oth
of
any
kind to clean re1
ay
contacts.
SYSJQLTEST
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.
.
SE.RVICING
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 Tests
Rotate time
dial
to
No.
0 time
dial
setting
and
check
by
means
of
a
lamp
that
the
contacts
just
c1ose.
The
point
at
whic~
the contacts
j'Jst
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
insure
aoproximately 1/32" wipe.
The
p-ickup
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 necessari'lv aqree •iiith the time
current
characteristics
of
Figures 6-8
and
20-22,
if
the
relay
has
been
adjusted to pickup
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
vo
1taqe
of
11
0
or
more, with
resistance
1
oad
boxes
for
setting
the
current.
See
Test C'ircui t
Figure 16.
13
Courtesy of NationalSwitchgear.com
GEK-45375
With
•he tap block
set
for the lowest tap
and
the time dial
set
where
contacts are
just
open,
adjust
tk~
control spring to
just
close the contacts within the
limits
given
below
which
are plus
and
minus
1%
of the tap
amps,
See
Table 12.
o"
TABLE
12
§P
Rang_:_~_Ta_p_-1-_M_i,n.
Amps
-~.
Amps
.
.5-4 i 0. 5 .495 .
505
--r-·
0-12.0 1.0 .99
1.01
·---~
------------'
It
should never
be
necessary to
wind
up
the control spring
adjuster
more
th.an
30
degrees (one notch)
or
unwind
it
more
than
120
degrees (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 sett·ing, apply
five
times tap
current to the
relay.
Adjust the position of the drag
magnet
assembly to obta'in
an
operating time
as
listed
in Table 13.
Relay
Time
(Seconds)
Min.
Max.
lT
l
~
IFC51
1.80
IFC53
l •
29
I
l.u
!FC77
I 0.90 i 0.94
However,
it
would
be
preferable to adjust the operating time
as
near
as
possible to 1.78,
1.31
or
0.92 seconds.
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
tfme
checks.
Jl1ECHANICAL
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,
Oetermi
ne
which
way
the disk
must
be
a1i
gned
to cl
ear
a
11
gap
surfaces
by
0.
O'\O
·inch.
(.
,i,
11
,
2.
Remove
the drag
magnet
assembly
by
loosening the
two
screws securing
it
to the support
structure.
V
The
screws
need
not
be
removed.
3.
Loosen
the upper pivot bearing
set
screw
(l/16
inch
hex
wrench)
slightly,
so
the upper pivot
can
move
freely.
Do
not
remove
the
set
screw
from
the support
structure.
4.
Loosen
the jewel bearing
set
screw
as
in 3 above.
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 l 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
wil'J
lower the disk
and
shaft
as-
sembly
approximately 0.005 inch
and
permit proper end-play,
The
shaft
must
have
0.005-0.010 inch
of end-play.
14
11'1'.'i
~
.
Courtesy of NationalSwitchgear.com
()
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
~ap
surfaces
by
0.010
inch
and
be
within 0.005 inch
flatness.
If
the disk
is
not within 0.005 inch
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
mount·ing
screws with 7-10 inch
pounds
of
torque,
after
securely
seating the assembly
and
positioning
it
according to the
Time
Test above.
HI-SEISt~IC
INSTANTANEOUS
UNIT
1.
Both
contacts should close
at
the
same
time.
2.
The
backing
strip
should
be
so
formed
that
the forked
end
(front)
bears against the
molded
strip
under the armature.
3.
With
the armature against the
po'le
piece, the cross
member
of the
"T"
spring should
be
in a
horizontal plane
and
there should
be
at
least
1/64"
wipe
on
the contacts.
Check
this
by
inserting
a 0.010"
feeler
gage
between
front
half
of the shaded pole with the armature held\
close.
Contacts should close with
feeler
gage
in place.
4.
Since mechanical adjustments
may
affect
the Seismic
Fragility
Leve·1,
it
is
advised
that
no.
mechanical adjustments
be
made
if
seismic
capability
is
of concern.
HI-SEISMIC
TARGET
AND
SEAL-IN
UNIT
Check
l
and
2
as
described under Instantaneous Unit.
To
check the
wipe
of the
seal-in
unit,
insert
a
O.O'IO"
feeler
gage
between
the
plastic
residual
of the armature
and
the pole piece with the armature held closed. Contacts should close with
feeler
gage
in place. Since mechanical adjustments
may
affect
the Seismic
Fragility
Level,
it
is
advised
that
no
mecnan1cal
adjustments
be
made
if
seismic
capability
is
of concern.
It
is
recommended
that
sufficient
quantities
of
renewal
parts
be
carried in stock to enable the
prompt
replacement of
any
that
are viorn, broken or
damaged.
When
ordering renewal
parts,
address the nearest
Sa
1es Office of the
Genera
1
Electric
Company,
specify quantity required,
name
of the
part
wanted,
and
the complete
model
number
of the relay for
which
the
part
is
required.
15
Courtesy of NationalSwitchgear.com
SUPPORT
STRUCTURE
TAP
SELECTOR
BLOCK
SEAL-IN
TARGET
ORAG
MAGNET
GEK-4537!i
CONTROL
SPRING
ADJUSTING
RING
TIME
OVERCURHENT
TAP
SELECTORS
..........
INSTANTANEOUS
UNIT
MAIN
MOVING
CONTACT
MAIN
STATIONARY
BRUSH
AND
CONTACT
ASSEMBLY
FIGURE
l
(8042708
)
TYPE
IFC53B
RELAY,
REMOVED
FROM
CASE,
FRONT
VIEW
DISK
U·MAGNET
ANO
TAP
BlOCI<
ASSEMBLY
TIME
OVERCURRENT
UNIT
FIGURE
2
(8042711)
TYPE
IFC53B
RELAY,
REMOVED
FROM
CASE,
REAR
VIEW
16
Courtesy of NationalSwitchgear.com
GEK-45375
--i--·--L
INDucnott
~
_j_
_ _.----
UNIT
-----
1
..
.
TS!
_·
...
-.
TS!
*
I*
=-1
0 0
2 G
5
*•
SHORT
FINGER
*
FIGURE
4 (0257A8339-2)
INTERNAL
CONNECTIONS
FOR
RELAY
TYPES
IFC51A,
IFC53A
AND
IFC77A-FRONT
VIEW
TSI
TSI
1
l 1
T_
..
J
r·
2
• =SHORT FINGER
IMllUCTI
··'------
llMIT
INST.
,---JV'v-
1
""
*
~
[~
J-=~
I
-r
lf:T
l14111
,.
·w·
,..
Ml!lll
-
JllQ
TO
'L•
Ft1!
Ltw
1-.Lllk
11tti1111
I•
MUii
RAH£
l'OSITI
C!ll
*
FIGURE
b (0257A8340-5)
INTERNAL
CONNECTIONS
FOR
RELAY
TYPES
IFC51B,
IFC53B
AND
IFC77B-FRONT
VIEW
* Indicates Revision
18
Courtesy of NationalSwitchgear.com
0
.
if)
~
,.
100
~
..
..
10
..
..
..
6 1 8 9 1
•
01--1.-1---
-·
......
•
•
•
•
'"
•
•
10
•
•
·~
•
•
•
•
-
"
•
•
•
•
1
.-
•
•
~
:,
..
..
..
"
·'
"
...
...
·"
...
...
...
...
...
...
--
-
-
-
.5
.6 .7
,8
.9
l
-
'
,,
'\
'
\
'
..
-
GEK-45375
4~818910
'"
30
40
50
60
70
8090"'
..
--
--
---
--
·-
-
-
--
. -
..
-
,.
'\.1'
~
' ' ~
........
'""
" ~
........
--:::
'
"",...
-.:::::
-.:::
" ~ "
r-,
i-...h~
'"
~
"~
~
"'-" 9
8
--
7
~
' s
~
' h
"'
~
4
~
-
a
i:;
I-
'
"'
2
"'
......
..I
~
....
,...
"'
I
2i
--
TIME
UN11
-
r-...._
w
lt
l
I=
-
-
-·
3 4 6 6 1 0
910
20
30
40
50
80
70
eoeoa
MULTIPLES
OF
PICK-UP CURRENT
-
--
...
·-
-
-
-
. -
-
• • ••••••
.....
...
-
-
~-·I-·""'
-
1
...
..
.
.
..
'"
...
..
.
.
..
'"
'"
·-
-~-
-1
..
..
..
70
..
-
--
--
-
-
-~
1
1
'"
..
..
..
..
'
·'
..
..
.•
-
..
..
..
..
..
..
*
FIGURE
6 (010888943-1)
60
HERTZ
TIME-CURRENT
CHARACTERISTICS
FOR
RELAY
TYPES
!FC51A
AND
IFC51
B
*Indicates
Revision
19
Courtesy of NationalSwitchgear.com
5 0 1 0 9 1
...
•
..
•
..
•
10
•
..
•
..
•
..
•
..
..
10
'
'
•
•
•
•
•
•
•
•
•
•
--
...
-
-~I--
~.
•
•
'
'
'
•
'
•
'
-·
'
•
•
'
'
~
•.
..
·'
·'
4
~
8 7 8 0
10
-
-----·
-
-·
-
.\'
~~
~
-·
' --
·-
\ \ '
\'
'
I\
\ " "
~~
L~~
' '
I''
~
~
\ .
['..~~
-
·~
......
·-
~
-.
-·
~~
--
~
-' -
I'--
'
--
'
-
~
GEK-45375
" 30
4G
50
GO
70
00908
- -
-
--
-~
~
-
-
-
--
--
f--
-
I'--..
10
~
7
~
6
'<!'
5
'-"
-
z
4
I-
I-
-3 ,
..
"'
'---
~
.J
2
~
a
TIME
UNIT '
.....
w
',
-
"'
--
,\
...
...
·"'
...
...
...
·"
·"'
...
,5
.6
,7
.o
.0
1
..
I -
....
I
\...-
-2
-
--
~
-
~--
~
s e 1 s e
10
20
30
4o
~o
eo
100000=
~
~
~
~
$
~
g
~~
MULTIPLES
OF
PICK
UP
SETTING
..
,_,
__
-
·-
-
-
_.1
..
-
-
-~
-1
...
-
·-
'--
-
*
FIGURE
7 (0108B8944-
l)
60
HERTZ
TIME-CURRENT
CHARACTERISTICS
FOR
RELAY
TYPES
IFC53A
AND
IFC53B
on
-
-I
I
1
1
...
..
.
.
..
,
..
.
..
..
.
'"
...
""
..
..
..
10
..
..
..
"
•
.\
..
.•
·"
..
..
.•
...
:02
.
..
Courtesy of NationalSwitchgear.com
This manual suits for next models
2
Table of contents
Other GE Relay manuals
