GE IJC51E User manual

GEK-65583B
INSTRUCTIONS
TYPE
IJC51E
CURRENT
BALANCE
RELAY
GE
Meter
and
Control
205
Great
Valley
Parkway
Malvern,
PA
19355-07
15

GEK—65583
CONTENTS
PAGE
DESCRIPTION
3
APPLICATION
3
RATINGS
4
CONTACTS
4
TARGET/SEAL-IN
UNIT
4
BURDENS
4
TARGET/SEAL-IN
UNIT
5
OPERATING
PRINCIPLES
5
CHARACTERISTICS
5
CONSTRUCTION
6
TESTS
7
DRAWOUT
RELAYS,
GENERAL
7
POWER
REQUIREMENTS,
GENERAL
7
TARGET/SEAL-IN
UNIT
TEST
8
INDUCTION
UNIT
9
RECEIVING,
HANDLING
AND
STORAGE
10
ACCEPTANCE
TESTS
10
VISUAL
INSPECTION
11
MECHANICAL
INSPECTION
11
CAUTION
11
INSTALLATION
PROCEDURE
12
LOCATION
12
MOUNTING
12
CONNECTIONS
12
ADJUSTMENTS
12
PERIODIC
CHECKS
AND ROUTINE
NAINTENANCE 12
CONTACT
CLEANING
13
SERVICING
13
RENEWAL
PARTS
13
2

GEK—65583
TYPE
IJCS1E
CURRENT BALANCE RELAY
DESCRIPTION
The Type IJC5IE
current balance relay consists of three mechanically-separate
but
electrically interconnected
induction—disk
units mounted in
a
large
size,
single-end drawout
case. The
outline and panel drilling dimensions
for the Type
IFC51E are
shown in Figure
13.
Each unit consists
of a
disk and shaft assembly
which carries
the
moving
contact. Each disk is actuated
by
two U-magnet and coil
assemblies, the operating coil
on
the
left—hand side and the restraint coil on the
right—hand side (front view).
Each disk
shaft
is restrained
by a spiral
spring
which holds the
contact open when the relay is de-energized.
There
is
a
target seal—in
unit mounted
on the
front
and to the left of the
shaft
of each
induction—disk unit. This
unit has its coil in series and its
contacts in
parallel with the contacts
of the main unit.
APPLICATION
The Type
IJC51E
relay is recommended
for the protection of
three—phase lines
and
machines
against
damage from
phase unbalance or
single—phase operation. The
relay is typically
applied where currents
in the three phases are normally balanced.
The
external
connection in Figure
14 illustrates a typical
application. The
relay
compares the currents
in each
phase with those
in
each of the other phases Any
increase in current
in the protected
circuit, regardless of
magnitude, will not
cause
a
relay
operation
as long as the unbalance does
not
exceed the slope
setting
of the
relay,
115,
125, 135 or 150%.
When
a
fault
or unbalance occurs in the machine
or
line, and
causes
the
current
in one
of the phases to
exceed that in the
others by more than the slope
setting,
the torque produced
by the operating coil will be greater than that
of
the restraint
coil, and
the relay will
operate
to trip the breaker.
The IJC51E relay
can be classified as a relay which protects against
discontinuity
of balanced-phase
conditions, rather
than
as
a fault—protective relay.
When
used
for
protection
against single-phase operation of a machine, it must have a
time setting
of such length
that it will not
trip
the
machine on an external single-
phase fault.
Such
a time delay must
permit selective tripping
by
the
relays
protecting
the
faulted circuit.
These .1nstructons
do
or purport to
cover
412
deta1ls or
vartions
in
equipnt nor to
provide
for
evert
possible contingency to
be
met
in
connection ..‘ith installation,
operation
or maintenance. Should
further
informaton
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 Cosçany.
To the
extent required the products described herein meet
applicable
ANSI.
IFEE and NFF(4
standards;
bit flO
Such assurance
is
qiwer, .‘ith respect
to local codes and
ordinances
because
they vary greatl!.
3

GE
K—65
583
RATI
NGS
The
IJC51E
is
a
three-phase
relay
rated
at
5
amperes,
50
or
60
hertz,
with
a
minimum
pickup
of
1 ampere
with
zero
restraint
current.
There
are
four
slope
selections available,
at
115, 125, 135 and
15O.
The
relay
has
three
target/seal—in
units,
one
per
phase,
rated at 0.2/2.0 amperes.
The
induction-disk
units
and
target/seal—in
units
are
contained
in
a
large,
Li
size,
drawout
case.
CONTACTS
The
main
unit
contacts
have
a
maximum
current-closing
rating
of
30
amperes
at
voltages
not
exceeding 250
volts
DC
for
tripping
duty.
The
main
unit
contacts,
when
used
without
the
target/seal—in
unit
contact, do
not
have
an interrupting
rating;
therefore,
the
trip
current
must
be
interrupted by
some
other
suitable
means.
TARGET/SEAL-IN
UNIT
The
target/seal-in
units
are
Hi-G
units
with
0.2
and
2.0
ampere
taps.
The 0.2
ampere
tap
can
be
used
for
trip
circuits
that
have
2
amperes
or
less
of
tripping
current. The
2.0
ampere
tap
is
used
in
trip circuits
that
have
at
least
2
amperes
and
up
to
30
amperes
of
trip
current available at the
maximum
control
voltage.
If
the
tripping
current exceeds
30
amperes,
an
auxiliary
relay
and
contact
must
be
used
to
carry
the
trip
current. The
connections should
be
made
so
that
the
trip
current
does
not pass
through
the
IJC
contacts
or
seal-in
unit.
The
target
ratings
are
shown
in
Table
I.
TABLE
I
TAPS
0.2
Amp
2.0
Amp
DC
Resistance
(ohms)
8.30
0.24
Minimum
Operating
(amperes)
0.2
2.0
Carry
Continuously
(amperes)
0.37
2.3
Carry
30
amperes
(seconds)
0.05
2.2
I
Carry
10
amperes
(seconds)
0.45
20
60
Hertz
Impedance
(ohms)
50
0.65
BURDENS
The
burdens
imposed
on
the
current
transformers
by
the
operating
and
restraining
coils
are
listed
in
Table
II.
4

GEK—65583
TABLE
II
I
Amp
5
Amp
10
Amp
20
Amp
40
Amp
Z
Pf
7 Pf
7
Pf
Z
Pf
7
P1
Operating
0.74 0.32
0.6?
0.32
0.50
0.279
0.335
0.30
0.225
0.39
Coil
Restraint
Coil
115% Slope
0.99
0.358
0.868
0.325
0.636 0.310
0.40
0.366 0.283
0.50
125%
Slope
1.06 0.34
0.928 0.31
0.65
0.30
0.41
0.345
0.29 0.47
135% Slope
1.20
0.33 1.05
0.30
0.716
0.29
0.448
0.345
0.292
0.474
150%
Slope 1.46
0.32
1.24
0.29
0.835
0.28
0.54
0.32
0.355
0.46
VA
can
be
calculated
from
the
equation:
VA
127
TARGET/SEAL-IN
UNIT
For
the
burdens
of
the
target/seal—in
units,
see
Table
I.
OPERATING
PRINCIPLES
The
operating
and
restraining
units
consist
of
U—magnets
similar
to
those
used
on
time-overcurrent
relays.
The
operating
U-magnet
is
located
on
the left
side of
the relay,
front
view,
and
the restraining
U-magnet
is
located
on
the
right
side,
front
view.
Torque
is
produced
by
phase
shifting
one
flux
away
from
the
other
by
use of
shading
rings
on
one
half
of
the
U-magnet
pole
face;
the other
half is
unshaded.
The
operating
U-magnet
produces
torque
to
close
the normally-open
contact,
while
the
restraining
U-magnet
produces
torque
to
open the
contact.
The
relay
will
close
its
contact
when
the
restraining
quantity
is
some
percentage
plus
or
minus
a
tolerance
of
the
slope
tap
selected
on
the
tap
block.
There
is
a
built-in
time
delay
produced
by the
permanent
Alnico
drag
magnet,
which
is
secured
to
the
shelf
of
the
unit
frame.
The drag
magnet
can
either
be
moved
inward
or
outward
on
this
shelf
to
make
the
corresponding
time
delay
shorter
or
longer.
This
procedure
sets the
time
delay
according
to
the time
curves
of
Figures
9
and
10.
CHARACTERISTI
CS
The
relay
is
used
as
a
current-balance
detector
on
a
three-phase
system.
The
relay
will
operate
to
close
its
normally-open
contact
to trip
a
breaker
when the
unbalance
between
any two
currents
of
the
three—phase
system
exceeds
the
slope tap
setting
and
its
tolerance.
5

GEK—65583
The
slope characteristics
are
shown
in Figures
1 through
8.
These
are
typical
slope curves
obtained
from actual
relay
tests.
The
factory
tested
relay,
as
received
by
the customer,
should
operate
within
i
7%
of
the
actual
slope
tap
setti
ng.
The
slope
characteristics
were
determined
by using
the
test
circuit
shown
in
Figure
15.
If
the
relay
is tested
with
the
connections
as
shown
in
the
external
connections
diagram,
Figure
14,
where
‘Restraint
is leading
‘Operating
by 120°,
the
slope
characteristic
increases
drastically
at
the
higher
restraint
currents.
The
change,
for
example,
at
40 amperes
restraint
at 125%
slope,
tested
per
Figure
15,
will
increase
to
approximately
180%
slope when
tested
with
IR
leading
I by
1200.
This
change
is of
no consequence
because the
relay
is not
a
fault
relay
and
is only
used
for
balanced-current
protection.
The
slopes are
correct
within
the tolerance
up to
10 amperes
restraint
for the
1200
out-of-phase
currents.
The
operating
times
of the
115%
slope
at
0, 2.5
and
5.0
amperes
restraint
are
shown in
Figures
9
and
10.
COtISTRUCTI
014
The
Type
IdC51E
relays
are assembled
in
a large size,
single-end
(Li)
drawout
case having
terminals
in the
rear
for external
connections.
The
electrical
connections
between
the relay
units
and the
case studs
are
made through
stationary
molded
inner
and
outer
blocks,
between
which
nests
a
removable
connecting
plug
to
complete
the circuit.
The outer
block
attached
to
the
case
has the
studs for
the
external
connections,
and
the
inner
blocks have
the
terminals for
the
internal
connections.
Every
circuit
in the drawout
case
has
an
auxiliary
brush,
as shown
in
Figure
ii,
to
provide
adequate
overlap
when the
connecting
plug
is
withdrawn
or
inserted.
Some
circuits
are
equipped
with shorting
bars
(see
internal
connections
in
Figure
12)
and
on those
circuits,
it is
especially
important
that
the auxiliary
brushes
make
contact
(as indicated
in
Figure
ii) with
adequate
pressure
to
prevent
the
opening
of
important
interlocking
circuits.
The
relay
mechanism
is
mounted in
a
steel framework
called the
cradle,
and
is a
complete
unit
with
all leads
terminated
at the
inner blocks.
This
cradle
is
held
firmly
in
the
case with
a
latch
at
both
top and
bottom,
and by a
guide
pin
at
the
back
of the
case.
The connecting
plug, besides making the
electrical
connections
between
the respective
blocks
of the
cradle
and case,
also
locks
the latch
in
place.
The
cover,
which is
drawn
to
the case
by
thumbscrews,
holds the
connecting
plug/s
in
place.
The target
reset
mechanism
is
part
of the
cover assembly.
The relay
case
is
suitable
for
either
semi—flush
or
surface
mounting
on
all
panels
up to
2
inches thick
and
appropriate
hardware
is available.
However,
panel
thickness
must
be
indicated
on
the
relay
order, to
ensure
that proper
hardware
will
be
included.
A
separate
testing
plug
can be
inserted
in
place
of the
connecting
plug
to
test
the
relay
in
place
on the
panel,
either
from
its own
source
of current
and
voltage,
6

GEK-65583
or
from
other
sources.
Or
if
desired,
the
relay
can
be
drawn
out
and
replaced
by
another
which
has
been
tested
in the
laboratory.
Figures
1
and
2
show
the
relay
removed from its
drawout
case
with
all
major
components
identified.
Symbols
used
to
identify
circuit components
are
the
same
as
those
which
appear
on
the
internal
connection
diagram in
Figure
14.
The
relay
includes
three
similar
subassembly
elements
called induction units,
mounted
on
the front
of
the
cradle.
The
induction
unit
is
the
basic
unit
in all
IJC
relays. These
units
are
of
the
induction-disk
construction.
The
disk
is
actuated
by a
current
operating coil
assembled
on a
laminated
U-magnet.
The
disk
shaft
carries
the
moving
contact,
which
completes the
alarm
or
trip
circuit
when
it
touches the
stationary contact.
The
disk
shaft
is
restrained
by
a
spiral
spring
to give
the
proper
contact-closing
current,
and
its
motion
is
retarded
by a
permanent
magnet
acting
on the
disk
to
give
the correct
time
delay.
There
is
a
seal—in
unit
mounted
on
the
front,
to
the
left
of
the
shaft.
This
unit
has
its
coil
in
series
and
its
contacts
in parallel
with
the
main
contacts,
such
that
when
the
main
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
button
beneath
the
lower
left
corner
of
the cover.
NOTE:
All tests
must
be
performed
with
the relay
in
its
case
or
in
an equivalent
case.
TESTS
DRAWOUT
RELAYS,
GENERAL
Since
all
drawout
relays
in
service
operate
in
their
cases,
it
is
recommended
that
they
be
tested
in
their
cases
or
an
equivalent
steel
case.
In
this
manner, any
magnetic
effects
of
the
enclosure
will
be
accurately duplicated during
testing.
A
relay
may
be
tested
without
removing
it
from
the panel
by
using
a
12XLA13A
test
plug.
This
plug
makes
connections
only
with
the
relay
and
does
not
disturb
any
shorting
bars
in
the
case.
The
12XLA12A
test
plug
may
also
be
used.
Although
this
test
plug
allows
greater
testing
flexibility,
it
also
requires CT
shorting
jumpers
and
the
exercise
of
greater
care,
since
connections
are
made
to
both
the
relay
and
the
external
circuitry.
POWER
REQUIREMENTS,
GENERAL
All
alternating—current-operated
devices
are affected
by
frequency. Since
non
sinusoidal
waveforms
can
be
analyzed
as
a
fundamental
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
test
alternating-current
relays properly,
it
is
essential
to
use
a
sine
wave
current
and/or
voltage.
The
purity
of
the
sine
wave
(i.e.,
its
freedom
from
harmonics)
cannot
be
expressed
as a
finite
number
for
any
7

GEK-65583
particular
relay;
however,
any relay
using
tuned
circuits,
RL
or
RC
networks,
or
saturaling
electromagnets
(such
as
tiine—overcurrent
relays),
would
be
essentially
affected
by
non-sinusoidal
waveforms.
Similarly,
relays
requiring
DC
control
power
should
be
tested
using
DC
and
not
full
wave
rectified
power.
Unless
the
rectified
supply
is
well filtered,
many
relays
will
not
operate
properly
due
to
dips
in
the
rectified
power.
Zener
diodes,
for
example,
can turn
off during
dips.
As
a
general
rule,
the
DC
source
should
not
contain
more
than
5%
ripple.
TARGET/SEAL-IN
UNIT
TEST
Set up
a
DC-current
circuit
capable
of
controlling
the
current
over
a
range
of
0.02 to
3.0
amperes.
Connect
the
circuit
to
studs
1
and
2
of
the
IJC51E
relay.
Check
the
tap that
the
target/seal-in
unit
is
in.
The
tap, as
received
from
the
factory,
will
normally
be
in
the
2.0 ampere
tap position.
Check
each
of
the
units
(top-middle-bottom)
separately
as
follows:
Reduce
the
current
to
approximately
zero
amperes. Place
a
jumper
from
stud
2
to
the
target/seal-in
current
tap used,
and
gradually
increase
the
current
until
the
target/seal—in
unit
picks
up. This
should
occur
at
the
value
listed
in
Table
III.
Remove
the
jumper
and
note
that
the
contact
of
the
target/seal-in
unit remains
closed.
Reduce
the
current
gradually
and
note
the
value
of
current
needed
to
drop
out
the
target/seal—in
contacts.
This
should
occur as
listed
in
the
dropout
portion
of
Table
III.
The
target/seal-in
flag
should
remain
latched-in.
It
can
only
be
reset
with
the
reset
arm
located
on
the
left
side
of
the
unit.
TABLE
III
TARGET
PICKUP
DROPOUT
TAP
AMPERES
AMPERES
0.2 amp
0.120
-
0.195
0.060
or
higher
2.0
amps
1.20
—
1.95
0.60
or
higher
The
target
taps
are
located
on
the
right
tap
plate
(front
view)
and
are
clearly
marked.
There
should
only
be
one
screw
in
this plate.
The
contact plate
on
the
left
side
of
the
target/seal-in
unit
should
have
two
screws.
One
screw
is
used to
hold
the
plate
in
place.
The
other
screw
is
used
when
the
target
tap (right
side)
must
be
changed.
This is
accomplished
by
taking
one
of
the
screws
from the
left
plate and
putting
it
into
the
alternate
tap of
the right
plate.
The original
tap
screw
on
the
right
plate
then
can
be
removed
and
placed
in
the left
plate.
This
procedure
ensures
that
the
mechanical
adjustments
on
the right
plate
are not
disturbed
when
the tap
screw is
changed
to
the
other
tap position.
8

GEK—5583
INDUCTION UNIT
Pickup
The
relay
must
be tested
in
its
own
case
or equivalent
steel
case.
Connect
the
relay
as
shown
in
the
test
diagram
of Figure
15
for
the
A
and
B
connections only.
Set
the
time
dial
at
the
1/2
time
dial
position.
Apply
110%
of
the
pickup
current
listed
on the
nameplate.
After
the
contact
makes,
reduce the
current
slowly
until
the
contact
just
opens,
increase
the
current
slightly,
and
the
relay contact
should
just
make.
A
flickering
indicating
light
is
considered
a
contact
closure.
The
pickup
should
be within
.j
2%
of
nominal,
and
can
be
adjusted
with the
control
spring sprocket
located
between
the
control
spring
and
moving contact.
There
are
notches
in
the
sprocket
that
can
be
used
to
turn the
assembly
with
a
screw
driver.
Turning
the
sprocket
to
the
right
increases
the
pickup
value. Turning
it
to
the
left
decreases
the pickup.
Reset
Remove
the
pickup
current.
Turn
the
time
dial
to
the
No.10
position.
Turn
the
disk
by
hand
to close
the normally-open
contacts.
Release
the
disk,
and
it
should
reset
to
the
stop
at
the
No.10
time
dial
position.
If
the disk
stops
somewhere
in its
travel,
look
for
excessive
friction,
parts
that
may
be
touching,
or
foreign
matter
in
the
drag
magnet air
gap.
Time
Tests
Figure
9
is
the
operating-time
curve
with
zero-restraint
current.
Figure
10
is the
operating-time
curve with
2.5
and
5.0
amperes
restraint
current
with
the
relay
set
in the
115%
slope
tap.
The
time—curve
settings
can
he
verified
using
the
connections
for
pickup
for
the
Figure
9
curve
and
the
slope connections
for
the
Figure
10
curve.
The
time
curve
can
be
varied
by
moving
the
drag
magnet
on
the
shelf
of
the
relay
unit
frame.
Moving
the
magnet
inwards
towards
the
disk
shaft
makes
the
time
faster;
moving
it
away
from
the
shaft
makes
the
time
longer.
Do not
move
the
magnet
outward past
the
serrations
on
the
disk,
because
it
begins
to
loose
its
effectiveness
beyond
that
point.
Slope
Tests
Refer
to Table
IV
and
Figure
15. Connect the
relay
as shown
in Figure
15.
Set
the
slope
at
115%.
Set the
time
dial
to the
1/2
time
dial
position.
Set
the
restraint
current
(IR);
then apply
the
operating
current
(10)
as
listed
in
Table
IV.
It
is
best
if
this
test
is
done
on
a
‘go
— no
go”
basis
because the
magnitude
of the
test
currents
will
overheat
the
units
and lower
the
actual
slope
setting.
The
“go
-
no
go”
method
is
as
follows:
9

GEK-65
583
Set
the
restraint
current
(IR).
Apply the
minimum operating current
(Is)
and
note that
the
disk
does
not
move
in
the
direction
to
close
the
normally-open
contact.
Apply
the
maximum
operating
current
and
note
that
the
disk
moves
in
the
direction
to
close
the
normally-open
contact.
It
is
best
not
to
wait
for
a
contact
closure
at
the
higher
values
because
of
the
overheating
effect.
The
above
tests
can
also
be
performed
on
the
other
slope
taps
as
mentioned
above,
using
Table
IV for
the
1 R
and
I
values.
TABLE
IV
OPERATING
CURRENT
Io
RESTRAINT SLOPE
IN
PERCENT
CURRENT
115
125 135
150
IR
= 5.OA
5.4
-
6.1 5.9
-
6.6 6.4
-
7.1 7.15
-
7.85
IR
= 8.OA
8.64
-
9.76
9.44
-
10.56
10.24
—
11.36
11.44
- 12.56
JR
20.OA
21.6
-
24.4 23.6
-
26.4 25.6
-
28.4 28.6
- 31.4
RECEIVING,
HANDLING
AND
STORAGE
These
relays,
when
not
included as
part
of
a
control panel,
will
be
shipped in
cartons designed
to
protect
them
against
damage.
Immediately
upon
receipt
of
a
relay,
examine
it
for
any
damage
sustained in
transit.
If
damage
due
to
rough
handling is
evident,
file
a
damage
claim
at
once
with
the
transportation
company and
promptly
notify
the
nearest
General
Electric
Sales
Office.
Exercise
care
when
handling or unpacking
the
relay
to
avoid
disturbing
adjustments
or
damaging
the
relay.
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
particles.
Foreign
matter
collected on
the
outside
of
the
case
may
find
its
way
to
the
inside
of
the
case
when
the
cover
is
removed,
creating
the
possiblity
of relay
nisoperation.
ACCEPTANCE
TESTS
Inilnediately
upon
receipt
of
the
relay,
an
inspection
and
acceptance
test
should
he
made
to
make
sure
that
no
damage
has
been
sustained
in
shipment
and
that
the
relay
calibrations
have
not
been
disturbed.
If
the examination
or
the
test
indicates
that
readjustment
is
necessary,
refer
to
the
section
on
SERVICING.
10

GE
K-65583
These
tests
may
be
performed
as
part
of
the acceptance
tests
or
of
the
installation
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
stamping
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
molded
parts
or other
signs
of
physical
damage,
and
that
all
screws
are
tight.
MECHANICAL
INSPECTION
1.
There
should
be no
noticeable
friction
when
the
disk
is
slowly
rotated
clockwise.
The
disk should
return
by
itself
to
the
reset
position.
2.
Make sure
the
control spring
is not
deformed,
and
that
spring
convolutions
are
not
tangled
and
do
not
touch
each
other.
3.
The
armature
and
contacts
of the
seal-in
unit
should
move
freely
when
operated
by
hand.
There
should
be at
least
1/32
inch
wipe
on
the
seal-in
contacts.
4.
The
targets
in the
seal—in
unit
must
come
into view
and
latch
when
the
armature
is
operated
by
hand,
and
should
unlatch
when
the
target
release
lever
is
operated.
5.
Make
sure
that
the
fingers
and
shorting
bars
agree
with
the
internal
connections
diagram,
Figure
12.
CAUTION:
Every
circuit
in
the drawout
case
has an
auxiliary
brush.
It
is
especially
important
on
current
circuits
and other
circuits
with
shorting
bars
that
the
auxiliary
brush
be
bent high
enough
to
engage
the connecting
plug
or
test
plug before
the main
brushes
do. This
will
prevent
the
CT
secondary
circuits
from
being
opened.
Pickup
Connect
the relay
per
Figure
15 for
the
A
and
B
connections.
The
pickup
of the
relay
is adjusted at
the
factory
for a
nominal
pickup
of
t
2%.
The
pickup
is
the
magnitude
of
current
necessary
to
close
the normally-open
contacts
with
zero
restraint
current.
The
pickup
can
be
adjusted
by
turning
the
adjusting
sprocket
located
just
above
the
control spring
that
has
the
outer
turn of
the
spring
soldered
to it.
Turn the
adjusting
sprocket
to
the
right
to
increase
the
pickup,
and
to the
left
to
decrease
the
pickup.
11

GIEK—65583
Ti
me
Time
can
be
varied
by
moving
the
drag
magnet
inward
or
outward on
the
shelf
of
the
die—cast
aluminum
frame.
Move
the
magnet inward
to
decrease
the
time.
Move
it
outward to
increase
the
time. The
leading
edge
of
the
magnet
should not
be
moved
outward
further
than
the
serrations
on
the
disk.
Slope
Set
the
slope
tap
in
the
proper
tap
for
your
application.
Refer
to
Figure
15
and
Table
IV for
the
vaThes
of
IR
and
10
as
listed.
There
are
no
adjustments
for
the
slope
characteristic
in
the
field on
the
IJC51E relay.
It
is
done
by
design,
and
therefore
not
easily
adjustable.
INSTALLATION
PROCEDURE
LOCATION
The
relay should
be
installed
in
a
clean,
dry
location,
free
from
dust
and
excessive
vibration,
and
well
lighted
to
facilitate
inspection
and
testing.
MOUNTING
The
relay
should
be
mounted
on
a
vertical
surface.
The
outline
and
panel-
drilling
dimensions
are
shown
in
Figure
13.
CONNECTI
ONS
The
internal
connections
diagram
for
the
relays
is
shown in
Figure
12.
Typical
external
connections are
shown
in
Figure
14.
One
of
the
mounting
studs
or
screws
should be
permanently
grounded
by
a
conductor
not
less
than
#12
B&S
gage
copper
wire,
or
its
equivalent.
ADJUSTMENTS
Target/Seal
-in
There
are
no
adjustments
available
on
the
target/seal-in
unit
in
the
field
to
easily
vary the
pickup or dropout
values.
The
unit
should
function
as
described
in
ACCEPTANCE
TESTS.
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.
The
interval
between
periodic
checks
will
vary
depending
upon
environment,
type
of
relay
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
under
ACCEPTANCE TESTS
be
checked
at
an
interval
of
from one
to
two
years.
12

GEK-65583
CONTACT
CLEANING
A flexible
burnishing
tool
should
be used
for
cleaning
relay
contacts.
This
is
a
flexible
strip
of
metal
with
an
etched—roughened
surface,
which
in
effect
resembles
a
superfine
file.
The
polishing
action
of
this
file
is
so delicate
that
no
scratches
are
left
on
the
contacts,
yet
it
cleans
off
any
corrosion
thoroughly
and
rapidly.
The
flexibility
of
the
tool
ensures
the
cleaning
of
the
actual
points
of
contact.
Do
not
use
knives,
files
or
abrasive
paper
or
cloth
of
any
kind
to
clean
relay
contacts.
SERVICING
If
it
is
found
during
the
installation
procedure,
or
during
periodic
testing
and
routine
maintenance,
that
the
relay
has
damaged
parts
or
is out of
calibration,
the
following
procedures
must
be performed.
Check
the
U-magnet
and
drag
magnet gaps
for
foreign
matter,
and
remove
it
from
the
relay.
Dirt
or
foreign
matter
can
cause
binding.
Contacts
should
be
cleaned
periodically
to
remove
any
foreign
materials.
Check
the paragraph
on
‘Contact
Cleaning”
for
this
procedure.
Damaged
parts
can
be
replaced
by
purchasing the replacement
part
through
the
General
Electric
Company
District
Sales
office.
If
either
the
operating
or
restraining
U-magnets must
be
replaced,
the
relay
must
be
retested. If
the
control
spring
is
replaced,
at
least
the
operating
pickup
must
be
retested
and
reset,
as
described
in
the
section
on
ACCEPTANCE
TESTS.
Relays
that
are
out
of
calibration
can
be
returned
to satisfactory
operation
by
making
some
minor
adjustments.
Pickup
can
be reset
by
adjusting
the
control
spring
with
the
adjusting
sprocket.
The
time
can
be
varied
with
the
drag
magnet.
By
design,
the
slopes
have
no adjustment
other
than
that
which
was
performed
at
the
factory.
U-magnet
air
gaps
have
a
significant
effect
on
the
slope
characteristic;
therefore,
the
U-magnet
gaps
should never
be disturbed.
If
a
U-magnet
is
replaced,
first
measure
the
air
gap
of
the
U—magnet
to
be
removed,
then
set
the
new
U-magnet
to
the
same
air
gap.
The
air
gaps
are maintained
by
the four
mounting
screws
which
secure
the
U—magnet
to
the
frame.
The
air
gap
is
held
by
inserting
a spacer
between
the
U—magnet
poles
to maintain
the
correct
gap,
with the
disk
removed,
while
the
four
mounting
screws
are
tightened.
Always
replace
the
screws
in
the
same
location
as
they
were
when
removed.
A
minor
slope
adjustment
can
be accomplished
by
varying
the
screws
from
steel
to
brass,
etc.
This
is
a
factory
adjustment,
and
the
screw
locations
should
remain
as
received
from
the
factory.
RENEWAL
PARTS
Sufficient
quantities
of
renewal
parts
should
be
kept
in
stock
for
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
name
of
the
part
wanted,
quantity required,
and
complete
nameplate
data,
including
the
serial
number,
of
the
relay.
13

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Slope
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Five
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Forty
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Restraint
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K- 65583
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