GE IJS52D User manual

GEI
-
90802
E
INSTRUCTIONS
SYNCHRONISM
CHECK
RELAY
TYPE
IJS
52
D
GE
Protection
and
Control
205
Great
Valley
Parkway
Malvern
,
PA
19355
-
1337
Courtesy of NationalSwitchgear.com

6
EI
-
90802
CONTENTS
PAGE
INTRODUCTION
3
APPLICATION
3
4
RATINGS
CHARACTERISTICS
Operating
Principles
4
4
BURDENS
5
CONSTRUCTION
6
RECEIVING
,
HANDLING
AND
STORAGE
6
ACCEPTANCE
TESTS
Visual
Inspection
Mechanical
Inspection
Electrical
Tests
6
6
7
7
INSTALLATION
PROCEDURE
Electrical
Tests
7
8
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
Contact
Cleaning
Mechanical
El
ectrical
8
8
9
9
9
SERVICING
Mechanical
Adjustments
Electrical
Adjustments
9
9
RENEWAL
PARTS
10
11
LIST
OF
FIGURES
Cover
Photo
(
8038824
)
2
Courtesy of NationalSwitchgear.com

GEI
-
90802
SYNCHRONISM
-
CHECK
RELAY
TYPE
IJS
52
D
INTRODUCTION
The
Type
IJS
52
D
relays
are
of
the
induction
-
disk
construction
,
and
are
intended
for
use
as
synchronism
-
check
relays
.
The
synchronism
-
check
unit
has
two
shaded
-
pole
l
)
-
magnet
driving
elements
acting
on
opposite
sides
of
a
single
rotating
disk
(
see
Figure
2
)
.
operating
element
,
drives
the
disk
in
the
contact
-
closing
direction
,
and
the
other
,
the
restraining
element
,
drives
the
disk
in
the
opposite
direction
.
The
disk
shaft
is
restrained
by
a
spiral
spring
,
the
purpose
being
to
hold
the
contacts
open
when
the
relay
is
de
-
energized
.
The
motion
of
the
disk
is
retarded
by
permanent
magnets
(
drag
magnets
)
acting
on
the
disk
to
give
a
time
delay
.
One
of
these
,
the
The
Type
IJS
52
D
relay
has
two
telephone
-
type
undervoltage
units
,
designated
as
"
B
"
and
"
L
"
on
Figure
7
.
The
Type
IJS
52
D
relay
does
not
have
a
seal
-
in
unit
,
since
one
is
not
required
in
its
normal
application
.
These
are
APPLICATION
The
IJS
relay
is
applicable
as
a
synchronism
-
check
relay
to
permit
closure
of
a
circuit
breaker
only
when
the
two
sources
connected
to
it
are
correctly
synchronized
elsewhere
.
incterconnections
,
and
then
permits
closure
of
the
circuit
breaker
,
for
a
typical
elementary
diagram
.
It
determines
that
synchronism
is
being
maintained
by
other
See
Figure
9
In
such
an
application
,
the
voltages
may
be
slightly
out
of
phase
with
each
other
because
of
different
line
and
load
characteristics
.
This
condition
may
exist
,
for
example
,
where
one
line
is
supplying
a
lagging
load
through
a
transformer
bank
,
and
the
second
is
unloaded
.
The
relay
,
however
,
can
be
calibrated
to
permit
closure
of
the
breaker
under
these
conditions
if
the
voltage
and
the
phase
-
angle
differences
are
not
excessive
.
However
,
the
IJS
relay
cannot
discriminate
between
a
very
low
slip
frequency
between
systems
,
and
systems
in
synchronism
.
Figures
13
and
14
illustrate
that
the
slip
frequency
with
which
the
IJS
will
permit
closing
increases
with
increasing
closing
-
angle
settings
,
and
decreases
with
increasing
time
-
dial
settings
.
In
general
,
the
closing
-
angle
setting
is
fixed
by
the
maximum
angular
separation
of
the
systems
for
which
the
IJS
must
operate
,
and
the
slip
frequency
for
which
the
IJS
will
operate
is
reduced
to
an
acceptable
maximum
by
increasing
the
time
-
dial
setting
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
Should
operetion
or
maintenance
.
every
possible
contingency
to
be
met
in
connection
with
installation
,
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
’
s
purposes
,
the
matter
shouid
be
referred
to
the
General
Electric
Company
.
IEEE
and
NEMA
standards
/
but
no
such
assurance
is
given
with
respect
to
Jocai
codes
and
ordinances
because
they
vary
greatly
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
Courtesy of NationalSwitchgear.com

GEI
-
90802
On
systems
where
lines
may
or
may
not
be
tied
together
elsewhere
,
the
IJS
relay
is
used
in
parallel
with
the
Type
GES
relay
to
permit
closure
of
a
breaker
with
zero
frequency
difference
.
Depending
on
the
external
connections
used
(
see
Figure
9
)
,
the
telephone
relays
"
B
"
and
"
L
"
,
mentioned
above
,
serve
to
reclose
the
breaker
under
conditions
of
(
1
)
dead
bus
or
line
,
(
2
)
live
bus
,
dead
line
,
(
3
)
dead
bus
,
live
line
,
(
4
)
dead
bus
,
live
line
,
or
live
bus
,
dead
line
(
5
)
dead
line
,
bus
live
or
dead
(
6
)
dead
bus
,
line
live
or
dead
.
RATINGS
The
operating
and
restraining
coils
of
the
synchronism
-
check
unit
are
continuously
rated
.
The
contact
of
this
unit
will
make
and
carry
momentarily
30
amperes
,
but
it
has
no
interrupting
rating
.
The
telephone
-
type
voltage
relay
contacts
will
make
and
carry
30
amperes
momentarily
for
normaly
duty
,
but
the
circuit
must
be
opened
by
a
breaker
auxiliary
unit
or
other
suitable
means
.
The
telephone
-
type
relays
have
operation
coils
rated
at
either
67
or
115
volts
.
CHARACTERISTICS
OPERATING
PRINCIPLES
The
operating
coils
,
mounted
on
the
left
-
hand
side
,
produce
a
torque
tending
to
close
the
synchronism
-
check
contact
.
This
torque
is
proportional
to
the
vector
sum
of
the
voltages
whose
phase
positions
are
being
compared
.
The
torque
produced
by
the
restraint
coils
is
proportional
to
the
vector
difference
of
the
voltages
.
The
operating
torque
is
maximum
when
they
are
in
phase
;
the
reverse
is
true
of
the
restraining
torque
.
The
closing
angle
of
the
relay
is
defined
as
the
maximum
phase
displacement
of
the
two
voltages
at
which
the
relay
will
close
its
synchronism
-
check
contact
when
the
voltages
are
at
rated
value
.
The
20
°
closing
angle
is
considered
standard
;
however
,
other
settings
may
be
made
,
as
indicated
by
the
voltage
-
phase
angle
characteristics
shown
in
Figure
1
.
The
time
-
delay
characteristics
of
the
Type
IJS
relay
are
obtained
primarily
by
the
time
-
dial
setting
.
The
time
dial
controls
the
distance
the
contacts
must
travel
before
closure
,
and
hence
controls
the
time
delay
.
At
No
.
10
time
-
dial
setting
,
the
travel
is
maximum
,
whereas
at
No
.
0
the
contacts
are
just
closed
.
A
certain
amount
of
adjustment
may
be
made
by
changing
the
position
of
the
drag
magnet
on
its
shelf
.
Moving
it
toward
the
disk
shaft
decreases
the
time
delay
,
while
moving
it
away
from
the
disk
shaft
increases
the
time
delay
.
Typical
time
vs
.
phase
-
angle
curves
are
shown
in
Figures
4
and
5
for
60
cycle
relays
.
The
Model
12
IJS
52
D
1
relay
has
a
standard
closing
angle
setting
of
20
°
,
and
has
its
drag
magnet
adjusted
to
provide
20
seconds
time
delay
from
the
No
.
10
time
-
dial
setting
for
voltages
in
phase
.
The
closing
angle
on
this
relay
can
be
adjusted
to
angles
greater
than
20
°
,
but
with
a
corresponding
decrease
in
time
delay
,
as
4
Courtesy of NationalSwitchgear.com

GEI
-
90802
shown
in
Figure
4
.
The
approximate
reset
time
with
both
coils de
-
energized
is
about
40
seconds
.
The
approximate
reset
time
with
one
coil
energized
at
rated
voltage
varies
from
3
seconds
on
the
20
°
setting
to
6
seconds
on
the
60
°
setting
with
the
No
.
10
time
-
dial
setting
.
The
Model
12
IJS
52
D
3
relay
,
which
is
designed
for
use
where
a
closing
angle
greater
than
200
is
required
,
provides
20
seconds
delay
at
the
400
closing
-
angle
setting
,
as
shown
in
Figure
5
.
It
may
be
adjusted
to
other
closing
angles
between
200
and
600
with
corresponding changes
in
time
delay
,
as
shown
in
Figure
5
.
The
approximate
reset
time
with
both coils de
-
energized
is
about
130
seconds
at
the
No
.
10
time
-
dial
setting
.
The
approximate
reset
time
with
one
coil
energized
at
rated
voltage
varies
from
13
seconds
on
the
20
°
setting
to
20
seconds
on
the
60
°
setting
at
the
No
.
10
time
-
dial
setting
.
Figure
6
gives
the
operating
time
in
seconds
for
various time
-
dial
settings
with
zero
phase displacement
and
with
rated
voltage
at
60
cycles
on
both
circuits
.
Curves
for
50
cycles
are
similar
.
The
telephone
-
type
undervoltage
units
are
calibrated
to
pick
up
at
50
%
or
less
of
rated
voltage
and
to
drop
out at
15
%
or more
of
rated
voltage
.
BURDENS
The
burdens
for
the
synchronism
-
check
unit
are
given
in
Table
I
.
The burden
varies
with
the
phase
displacement
of
the
two
voltages
,
with
a
minimum
at
0
°
to
a
maximum
at
180
°
.
TABLE
I
Vol
ts
Cycles
Circuit
Phase
Difference
Watts
Volt
Amps
Power
Factor
0
°
1.00
0.258
0.312
0.300
0.360
5
-
6
3.86
180
°
1.25
4.00
5
-
6
0
°
1.10
3.63
67
*
60
7
-
8
1800
7
-
8
1.36
3.77
1.45
4.73 0.306
0.359
0.357
0.403
5
-
6
180
°
1.75
4.87
5
-
6
0
°
4.45
1.58
67
*
50
7
-
8
180
°
1.87
4.63
7
-
8
0
°
3.00
11.6
0.258
0.313
0.300
0.360
5
-
6
180
°
3.76
12.0
5
-
6
0
°
3.30
10.9
115
60
7
-
8
180
°
4.07
11.3
7
-
8
4.35
14.2
0.306
0.359
0.357
0.403
5
-
6
180
°
5.25 14.6
5
-
6
0
°
4.75
13.3
115
50
7
-
8
180
°
5.60
13.9
7
-
8
*
The
burden
of
telephone
-
relay
units
is
10
volt
-
amperes
and
6
watts
for
each unit
rated
at
67
volts
,
60
cycles
,
and
13
volt
-
amperes
and
8
watts
for
each
unit
rated
at
115
volts
,
60
cycles
.
5
Courtesy of NationalSwitchgear.com

GEI
-
90802
CONSTRUCTION
The
relay
components
are
mounted
in
a
cradle
assembly
that
is
latched
into
a
drawout
case
when
the
relay
is
in
operation
,
but
they
can
be
easily
removed
when
desired
.
To
do
this
,
the
relay
is
first
disconnected
by
removing
the
connection
plug
that
completes
the
electrical
connections
between
the
case
blocks
and
the
cradle
block
.
To
test
the
relay
in
its
case
,
this
connection
block
can
be
replaced
by
a
test
plug
.
The
cover
,
which
is
attached
to
the
front
of
the
relay
case
,
contains
an
interlock
arm
that
prevents
the
cover
from
being
replaced
until
the
connection
plugs
have
been
inserted
.
Every
circuit
in
the
drawout
case
has
an
auxiliary
brush
,
as
shown
in
Figure
12
,
to
provide
adequate
overlap
when
the
connecting
plug
is
withdrawn
or
inserted
.
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
insure
that
proper
hardware
will
be
included
.
For
outline
and
drilling
dimensions
,
see
Figure
15
.
Internal
connections
for
the
IJS
52
D
are
shown
in
Figure
7
.
Note
that
the
connections
to
terminal
10
are
arranged
so
that
the
normally
-
closed
contact
of
"
B
"
or
"
L
"
can
be
used
separately
,
as
shown
in
the
typcial
external
connections
in
Figure
9
.
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
,
relay
,
examine
it
for
any
damage
sustained
in
transit
,
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
.
Immediately
upon
receipt
of
a
If
injury
or
damage
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
of
the
case
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
tests
indicate
that
VISUAL
INSPECTION
Check
the
nameplate
stamping
to
make
sure
that
the
Model
Number
and
rating
of
the
relay
agree
with
the
requeisition
.
6
Courtesy of NationalSwitchgear.com

GE
1
-
90802
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
.
Check
that
the
short
fingers
are
in
the
correct
location
,
as
indicated
1
n
Figure
7
,
and
that
the
auxiliary
brushes
are
properly
adjusted
(
see
Figure
12
)
.
MECHANICAL
INSPECTION
1
.
Check
that
the
rotating
element
moves
without
noticeable
friction
.
2
.
Remove
the
time
-
dial
locking
screws
and
check
that
the
moving
contact
just
touches
the
stationary
contact
when
the
time
dial
is
set
at
zero
(
0
)
.
The
contact
wipe
should
be
approximately
1
/
32
"
.
Put
locking
screws
back
in
place
.
3
.
Check
that
the
control
spring
is
not
deformed
and
that
the
spring
convolutions
at
the
No
.
5
time
-
dial
setting
are
reasonably
concentric
.
4
.
Check
that
the
armatures
of
the
telephone
relays
move
freely
.
Also
,
with
the
telephone
relays
in
the
de
-
energized
position
,
all
circuit
-
closing
contacts
should
have
a
gap
of
0.015
"
and
all
circuit
-
opening
contacts
should
have
a
wipe
of
0.005
"
.
Gap
may
be
checked
by
inserting
a
feeler
gage
,
and
wipe
can
be
checked
by
observing
the
amount
of
deflection
on
the
stationary
contact
before
parting
the
contacts
.
The
armature
should
then
be
operated
by
hand
and
the
gap
and
wipe
again
checked
as
described
above
.
ELECTRICAL
TESTS
Connect
the
relay
as
shown
in
Figure
10
and
check
the
following
:
Check
that
the
relay
picks
up
with
approximately
the
time
delay
shown
1
n
Figure
6
when
a
single
-
phase
source
of
at
least
rated
voltage
is
connected
to
both
operating
coils
.
Check
that
the
relay
picks
up
at
a
20
°
closing
angle
(
or
other
closing
angle
1
f
used
)
within
+
3
°
when
connected
to
a
source
with
rated
voltages
on
both
coils
.
Check
zero
-
displacement
pickup
,
which
should
agree
with
the
value
in
Figure
1
within
+
10
%
.
1
.
2
.
3
.
With
both
coils
connected
to
a
rated
voltage
source
with
zero
displacement
,
check
that
pickup
time
agrees
with
the
values
given
in
Figures
4
or
5
+
10
%
.
4
.
With
an
adjustable
115
volt
source
of
rated
frequency
,
check
that
the
telephone
-
type
units
pick
up
at
50
%
or
less
of
rated
voltage
and
drop
out
at
15
%
or
more
of
rated
voltage
.
To
check
the
"
L
"
relay
,
connect
the
voltage
source
to
studs
5
and
6
.
To
check
"
B
"
relay
,
connect
voltage
to
studs
8
and
9
.
INSTALLATION
PROCEDURE
If
,
after
acceptance
tests
,
the
relay
is
held
in
storage
before
shipment
to
the
job
site
,
it
is
recommended
that
the
visual
and
manual
inspections
described
in
the
section
on
ACCEPTANCE
TESTS
be
repeated
before
installation
.
7
Courtesy of NationalSwitchgear.com

GEI
-
90802
ELECTRICAL
TESTS
Before
the
following
electrical
tests
are
made
,
the
relay
should
be
in
its
case
,
preferably
mounted
in
its
permanent
location
.
The
relay
closing
angle
should
be
set
as
required
for
its
permanent
location
,
which
would
normally
be
20
°
.
Connect
the
relay
as
shown
in
Figure
10
,
and
check
that
the
relay
picks
up
at
the
proper
phase
angle
i
3
°
.
If
a
phase
angle
meter
or
a
phase
shifter
is
not
available
,
it
is
possible
to
adjust
the
relay
to
approximately
the
closing
angle
desired
by
means
of
the
connections
and
curve
shown
in
Figure
11
.
In
this
test
,
rated
voltage
is
held
on
one
circuit
(
studs
7
-
8
)
and
a
reduced
voltage
is
applied
to
the
other
circuit
(
studs
5
-
6
)
.
The
voltage
connected
to
studs
5
-
6
is
adjusted
until
the
synchronizing
-
check
unit
just
closes
its
contact
.
with
the
voltage
given
on
the
curve
shown
in
Figure
11
for
the
phase
angle
used
(
e
.
g
.
24
volts
for
20
°
closing
)
.
The
difference
between
the
two
voltages
should
agree
approximately
When
using
the
connections
shown
in
either
Figure
10
or
Figure
11
,
check
the
operating
time
at
0
displacement
with
rated
voltage
on
each
coil
,
using
the
time
-
dial
setting
of
the
permanent
location
.
See
Figure
6
for
nominal
time
-
delay
values
.
Pickup
and
dropout
of
the
telephone
-
type
undervoltage
relays
should
be
checked
as
described
in
the
section
on
ACCEPTANCE
TESTS
.
PERIODIC
CHECKS
AND
ROUTINE
MAINTENANCE
In
view
of
the
vital
role
of
protective
relays
in
the
operation
of
a
power
The
interval
system
,
it
is
important
that
a
periodic
test
program
be
followed
,
between
periodic
checks
will
vary
depending
upon
environment
,
type
of
relay
and
the
user
'
s
experience
with
periodic
testing
,
experience
to
select
the
test
interval
best
suited
to
his
individual
requirements
,
it
is
suggested
that
the
following
points
be
checked
once
a
year
.
Until
the
user
has
accumulated
enough
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
insures
the
cleaning
of
the
actual
points
of
contact
.
Relay
contacts
should
not
be
cleaned
with
knives
,
files
,
or
abrasive
paper
or
Knives
or
files
may
leave
scratches
,
which
increase
arcing
and
deterioration
Abrasive
paper
or
cloth
may
leave
minute
particles
of
insulating
cloth
.
of
the
contacts
,
abrasive
material
in
the
contacts
,
and
thus
prevent
closing
.
The
burnishing
tool
described
above
can
be
obtained
from
the
factory
.
8
Courtesy of NationalSwitchgear.com

GEI
-
90802
MECHANICAL
The
mechanical
checks
described
in
the
section
on
ACCEPTANCE
TESTS
should
be
repeated
.
ELECTRICAL
Using
the
connections
in
Figure
8
:
Check
that
the
maximum
closing
angle
for
pickup
of
the
synchronizing
-
check
unit
agrees
approximately
with
the
value
shown
on
the
curve
in
Figure
11
.
1
.
Check
the
closing
time with
the
potentiometer
set to
provide
rated
voltage
on
both
circuits
.
The
time
should
agree
with
the values
given
in
Figure
6
,
±
10
%
.
2
.
Check
the
pickup
and
dropout
of
the
telephone
-
type
undervoltage
units
(
27
B
and
27
L
)
.
SERVICING
If
recalibration
of
the
relay
is
necessary
,
the
following
should be
considered
when
making
adjustments
.
MECHANICAL
ADJUSTMENTS
The
moving
contact
should
just
touch the
secondary
contact
when the
time
dial
is
set at
the
zero
(
0
)
position
.
If
readjustment
is
necessary
,
loosen
the
two
clamping
screws
which
fasten
the
stop
arm
to
the shaft and
change
the
position
of the
stop
arm
relative
to
the
moving
contact
until
the
contacts
just
touch
with
the
time
dial
set at
0
.
A
fine
adjustment
can
be
obtained
by
moving
the
stationary
contact
brush
in
or
out
by
means
of
its
adjusting
screw
.
However
,
in
the
final
adjustment
,
the
contact
brush
must
be
positioned
so
that
there
is
1
/
64
"
to
1
/
32
"
wipe
with
the
contact
fully
closed
.
Be
sure
that the
screws
are
securely
tightened
after
the
adjustment
is
made
.
1
.
The
stop
-
arm
leaf
spring
should
deflect
at
least
1
/
64
"
when
the
synchronism
-
check
unit is
de
-
energized
.
2
.
The
disk
and shaft
assembly
should have
a
vertical
end
play
of
1
/
16
"
to
1
/
32
"
and
both
bearing
screws
should be
tight
,
centered between
the
poles
of
the
U
-
magnet
and
drag
magnet
.
3
.
The
disk
should be
approximately
Telephone
-
type
relay
contact
gaps
may
be
adjusted
by
bending
the
stationary
contact
brush
to
obtain
0.015
inch
gap
.
When the
adjustment
is
made
,
the
wipe
must
be
rechecked
to
make
sure
there
is
a
minimum
of
0.005
"
wipe
.
4
.
ELECTRICAL
ADJUSTMENTS
Closing
Angle
Adjustment
To
make
an
accurage
adjustment
of the
Connect
the
relay
as
shown
in
Figure
10
.
closing
angle
,
a
phase
shifter
and
phase
angle
meter
are
required
,
along
with
a
means
for
voltage
control
.
9
Courtesy of NationalSwitchgear.com

GEI
-
90802
Two
adjustments
are
necessary
for
obtaining
a
desired
closing
angle
.
The
right
-
hand
adjustable
resistor
at
the
top
of
the
frame
permits
equalizing
the
closing
angle
.
That
is
,
the
closing
angle
will
be
the
same
,
whether
one
voltage
is
leading
or
lagging
the
other
voltage
.
The
left
-
hand
adjusting
resistor
is
for
obtaining
the
correct
closing
-
angle
setting
.
Simultaneous
adjustments
of
the
two
resistors
are
necessary
.
Using
the
connections
shown
in
Figure
10
,
set
Vi
at
rated
voltage
.
If
a
20
°
closing
angle
is
desired
,
set
V
2
at
rated
voltage
,
leading
Vi
by
20
°
.
Adjust
the
left
-
hand
resistor
until
the
contacts
just
close
.
Now
,
with
rated
voltage
on
both
circuits
,
determine
the
angle
at
which
the
contact
closes
with
V
2
lagging
Vi
.
If
the
two
angles
are
unequal
,
equalize
them
at
20
°
by
adjusting
the
right
-
hand
resistor
.
Then
check
the
closing
angle
with
V
2
leading
Vi
,
and
readjust
if
necessary
.
Continue
this
procedure
until
the
relay
contacts
just
close
for
Vi
leading
or
lagging
V
2
by
200
.
Use
the
same
procedure
for
other
closing
-
angle
settings
.
Pickup
and
Dropout
The
pickup
and
dropout
of
the
telephone
-
type
relay
may
be
changed
by
adjusting
the
gap
between
the
armature
and
the
pole
face
by
bending
the
contact
operating
arm
stop
.
After
this
adjustment
is
made
,
the
contact
wipe
and
gap
must
be
rechecked
.
Operating
Time
If
it
is
necessary
to
adjust
the
time
characteristics
,
impose
the
chosen
conditions
on
the
relay
,
using
connections
shown
in
Figure
10
,
and
adjust
the
time
dial
and
,
if
necessary
,
the
drag
magnet
until
the
correct
operating
time
is
obtained
.
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
.
If
possible
,
give
the
General
Electric
requisition
number
on
which
the
relay
was
furnished
.
Since
the
last
edition
,
changes
have
been
made
in
the
final
step
of
ELECTRICAL
TESTS
,
ON
PAGE
7
.
10
Courtesy of NationalSwitchgear.com