GE IFC53M User manual

INSTRUCTIONS
TIME
OVERCURRENT
RELAY
TYPE
IFC53M
GEK-65572
Supplement
to
GEK-45375
GENERAL
‘1’
ELECTRIC

GEK-65572
TIME
OVERCURRENT
RELAY
TYPE
IFCS3M
I NTRODUCT
ION
These
instructions
are a
supplement
to
instruction
book
GEK-45375.
The combination
of the
two books
form instructions
for
the
Type
IFC53M
relay.
These
relays
provide
for
a
target
seal-in
unit
for
both
the time
overcurrent
element
and the
instan
taneous overcurrent
unit.
The Type
IEC53M
relay
is similar
to
the Type
IFC53A
with
the
addition
of
a
right—hand
target
and
seal-in
unit
and
a
high
dropout
instantaneous
unit
mounted
in
the
rear
of
the
relay
unit.
The special
high dropout
instantaneous
unit
is
constructed
without
a
target
and
is
designed
to yield
dropout values
of 80
percent,
or
higher,
of
pickup
current.
The pole
piece
is
constructed
and
secured
with
a
special
wave
washer
so
that
it
can be
rotated
to the
most
favorable
position.
The
unit
may
be
calibrated
in the
standard
manner
once
the
pole
piece
has been
adjusted
for
80 percent
dropout
or
higher.
HI-SEISMIC
HIGH
DROPOUT INSTANTANEOUS
UNIT
The
high dropout
instantaneous
unit
contacts
will
close
30
amperes
at
voltages
less
than
250
volts.
The coil
ratings available
are
shown
in Table
1.
The
high
dropout instantaneous
unit
is
tapped
for operation
on
either
of
two
ranges
(H or
L).
Selec
tion
of the
high
or low
range
is
accomplished
by
means
of a
range
selection
link
located
on
the
top
of
the
support
structure.
TABLE
1
Tap
Continuous
**One
Second
K
Unit
Position
*Range
Rating Rating
(Pjnps)
(mps)
L
2-4
1.9
2-8
70
4900
H
4-8
3.0
L
4-8
4.3
4-16
140
19600
H
8-16
6.9
L
10-20
9.0
10-40
275
75500
H
20-40
16.2
L
20-40
12.6
20-80
275
75500
H
40-80
20.0
*The
range
is
approximate
which
means
that
the 2—4,
4-C may
be
2-5,
4-8.
There
will
always
be
at
least
one drnpere
overlap
between
the
maximum
L
setting
and
the
minimum
H
setting.
Whenever
possible
select
the
higher
range, since
it
has
the
higher
continuous
rating.
Make
sure
that
the
range
selection
link
is
in
the
correct
position
for
the
range
in
which
it
is
to
operate.
These
2nstructloflq
do not
purport
to cover
all
details
or
variations
in
equipment
nor
to
provide
for
ever;
possible
contingency
to
be
met in
connection
with
installation,
operation
or
maintenance.
Should
farther
information
be
desired
or should
particular
problems
arise
which
are
not covered
sufficiently
for
the
ourchaser’s
purposes,
the
matter
should
be referred
to
the General
Electric
Company.
Tc
the
extent
requirod
the products described
herein
meet
applicable
SI,
IEEE and
NEiL21
standards;
but
no such
assurance
is
given
with respect
to
local
codes
and
ordinances
because
they
vary
greatly.
3

GEK—55572
**Higher
currents
may
be
applied for
shorter lengths
of
time
in
accordance
with
the
formula:
The
high
dropout
unit
coil
is
in
series
with
the
time
overcurrent
unit
coil,
see
Table I,
and
GEK
45375
to
determine
the
current
limiting
element
for
both
continuous
and
short
time
ratings.
The
high
dropout
instantaneous
unit
is
similar to
the
standard instantaneous
unit
except
it
has
no
target,
and
dropout
current
is
approximately
80
-
90
percent
of the
pickup
current.
Fig.
3
Is
a
picture
of
the
high
dropout
unit.
The
adjustable
core
(A)
sets
the
pickup level.
Turning
the
core
down
(clockwise,
top
view)
lowers
the
pickup,
while
turning the
core
up
(counterclockwise,
top
view)
increases
the
pickup.
Before
attempt
ing
to
turn
the
core,
the
locknut
(B)
must
be
loosened.
After
adjusting
the
core,
the locknut
must
be
retightened.
When
loosening
or
tightening
the
locknut,
the
sleeve
(C)
to
which
the
shading
ring
(D)
is
attached
must
be
held to
preveit
it
from
turning.
Rotation
of
the
shading
ring
sets
the
dropout
level
and
thereby
determines
the
quietness
of
operation
in
the
picked
up
position.
The
core
has
been
factory
set
to
obtain
80
percent
dropout
at
the
minimum
setting and
approximately
90
percent
dropout
at
the
maximum set—
tlng.
Should
it
be
necessary
to
change
the
dropout
setting, the
sleeve
(C)
to
which
the
shading ring
CD)
is
attached
must
always
be
turned
in
the
clockwise
direction
(top
view).
This
will
prevent
the
sleeve
and
shading
ring
assembly
from
being
loosened.
The
unit
will
pick
up
at
the
scale-plate
marking
plus
or minus
five
percent
with
gradually
applied
current.
The
operating
time
is
shown
in
Fig.
4.
Fig.
S
shows transient
overreach
characteristics.
The
Hi-Seismic
high
dropout
instantaneous
unit
burdens
are
listed
in
Table
2.
TABLE
2
Hi—Seismic
I
High
Dropout
Movable
Mm.
Burdens at
Mm.
Burdens
in
Ohms
(Z)
Hz
Lead
Pickup
Pickup_(Ohms)
Times_Pickup
Inst.
Unit
Position
Amps
R
Z
3
10
20
(Amps)
L
2-4
2
0.77
0.66
1.02
0.66
0.52 0.52
2-8 60
H
4-8
4
0.26 0.16
0.30
0.23 0.22
0.22
L
2-4
2
0.68
0.56
0.88
0.60
0.48 0.44
2-8
50
H
4—8
4
0.24 0.13 0.27
0.22
0.19
0.19
L
4-8
4
0.22
0.18
0.29 0.18 0.14 0.13
4-16
60
H
8-16
8
0.079
0.030 0.084
0.061
0.056
0.056
L
4-8
4
0.19
0.14
0.024
0.16
0.13
0.12
4-16
50
H
8-16 8
0.069
0.030
0.075
0.056
0.054
0.052
L
10-20
10
0.045
0.027
0.053
0.037
0.032 0.029
10-40
60
H
20-40
20
0.020 0.007 0.021
0.018
0.017
0.017
L
10-20
10
0.039
0.024
0.046 0.032
0.028
0.025
10—40
50
H
20-40 20
0.017 0.006
0.018
0.015
0.014 0.014
L
20-40
20
0.025
0.008
0.027
0.022 0.022
0.021
20-80
60
H
40-80
40 0.018
0.001
O.OU
0.014 0.014
0.013
L
20-40 20
0.021
0.007
0.022
0.018 0.018
0.017
20-80
[50
H
40-80
40
0.015
0.001
O.0l0.O12
0.012
0.011
INSTALLATION
The
outline
and
panel
drilling
diagram
is
shown
in
instruction
book
GEK-45375.
The
internal
connec
tion
diagram
is
shown
in
Fig.
6
of this
supplement.
4

GEK-b5512
TIME
DIAL
SEAL-
IN
TARGET
FOR
TIME
OVERCURRENT
UNIT
E
AL - N
T AROFT
TAP SE[.LCT DR
Fig.
1
(8043607)
TAP
SELECTION
BLOCK
INSTANTANEOUS
UNIT
RANGE SELECTION
LINK
SEAL-IN TARGET
FOR
INSTANTANEOUS
OVERCURRENT
UNIT
SEAL-IN TARGET
TAP SELECTOR
SCREW
Type
IFC53M
Relay,
Renoved
fro
Cise.
Front
‘[lew
N --
5

/
INS IANTANEOUS
HIGH
DROPOUT
UNIT WITH
ADJUSTABLL CORE
-M AG N
El
ASSEMBL’ FOR
TIME
OVERCURREN
UNIT
Fig.
2 (8O436O8
Type
IFC53M
Relay,
Removed
from Case,
Rear View
6

ADiUSABLE
CORE
(A)
LOCKNUT(B)
)tL
E’
—
..‘--
-
—SHADING
RiNG(D
Fi 1 .
.3
8O3b363
Construction
of
the high
Dropout
Instantaneous
Linit
1

GE
K-6 557?
c
030
0.025
o.c20
0.015
0010
o.
005
MULTIPLES OF
PICK—UP
0
LI
U,
LI
D
0
OPERATING TIME
.
RANGE FOR
ANY
—
PICKUP
SETTING
00
1
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GEK-65572
LNSTANTANEOUS
HI DROPOUT
N
= SHORT
FINGER
Fig. 6 (o275A4554-a)
Internal
Connection Diagram
for
Type
IFC53M
Relays
INDUCT
ION
SI
*
*
2
(0
10