GE IAV53E User manual

JNSTR
UCTJONS
VOLTAGE
RELAY
TYPE
IAV53E
GE
I-28824B
INSERT
BOOKLET
GEH-1814
The
Type-IAV53E
relay
has one
open
and
one
closed
contact,
and
is
similar
to the
Type-1AV53
relay
described
in
the
included
instructions,
GEH-1814,
except the
operating
coil
has no
taps
and
the
seal-in
units
are
omitted.
The
relay
is
adjusted
to
close
its left
contacts
at
25 volts
and
its
right
contacts
at
20
volts.
With
this
caHbration,
the
relay
coses
its
right
contacts
in
3
seconds
when
the
voltage
is
suddenly reduced
to
zero
(0).
A
typical
time—voltage
curve
is
shown
in
Figure
2.
The
internal
connections
are
shown
in
Figure
1.
BURDEN
VOLTS
AMPERES
WATTS
115
0.144
4.5
-J
•
OPERATING
-
COIL
#..
1
ø.O.
Figure
1 (K-6400143[21)
Internal-Connection
Diagram
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment nor
to
provide
for
every
possihie
contingency
to
be
met
in
connection
with installation,
operation
or
maintenance.
Should
further
information
he
desired
or
should
particular
problems
arise
that are
not
covered
sufficiently
for
the
purchaser’s
purposes,
the matter
should
he
referred
to
the
General
Electric
Company.
To
the
extent
required
the
products described
herein
meet
applicable ANSI,
IEEE
and
NEMA
standards:
hut
no
such
assurance
is
given
with
respect
to
local
codes
and ordinances
because
they
vary
greatly

GEI-28824
I.—
—
l
1
L
I’
-i:
‘..T;it.:
.1
4
1O
&O
-_
it&
I
Wfl
QO$TACZ2
—
—
———i——
—
——
—
—————
Figure
2
(K—6315689)
Typical
Time-Voltage
Curves
for
Type-IAV53L
Relays
(±
10%)
(10/90)
(200)
GENERAL
ELECTRIC
METER
AND
CONTROL
BUSINESS
DEPT..,
MALVERN,
PA
19355
2

GEH- 1814J
IAV51A
IAV52A
IAV53A
I AV
53
B
IAV53C
1AV530
IAV53K
IAV53L
IAV53M
IAV53N
JNSTR
(ICTIONS
VOLTAGE RELAYS
TYPES
GENERAL ELECTRIC

GEH-1814
TABLE
OF
CONTENTS
PAGE
DESCRIPTION
3
APPLICATION
3
RATINGSANDBURDENS
4
CHARACTERISTICS
6
CONSTRUCTION
7
RECEIVING,
HANDLING
AND STORAGE
8
RECEIVING
8
HANDLING
8
STORAGE
8
ACCEPTANCE
TESTS
8
VISUAL
INSPECTION
8
MECHANICAL
INSPECTION
9
ELECTRICAL TESTS
9
Drawout
Relays, General
9
PowerRequirements,General
10
Pickup
VoltageTest
10
Time-Voltage Test
10
INSTALLATION
11
INSPECTION
11
LOCATION
11
MOUNTING
11
CONNECTIONS
11
GROUND
CONNECTIONS
11
FIELD
INSTALLATION
TESTS
11
PERIODIC
CHECKS AND ROUTINE
MAINTENANCE
11
DISKANDBEARINGS
11
CONTACTCLEANING
12
SERVICINGANDADJUSTMENTS
12
TARGETANDSEAL-lN
UNIT
12
VOLTAGE
SETTING
12
TIME
SETTING
13
BEARINGANDCONTACTS
13
RENEWAL
PARTS
13
LISTOFFIGURES
14
2

GEH-t
814
VOLTAGE
RELAYS
TYPES
IAV51A
IAV52A
IAV 53A,
53B, 53C, 53D,
53K,
531,
53M,
and
53N
DESCRIPTION
Type
IAV
relays
are
single-phase,
voltage-operated,
induction-disk
relays
with adjustable
time
delay.
The
IAVS1A
and
IAV52A
are
overvoltage
relays.
The
IAV53A,
B,
C,
D,
K,
L,
M,
and
N
are
over-
and
undervoltage
relays.
APPLICATION
These
IAV relays
are
used
for
protection
against
alternating-current
(AC) overvoltage,
for
permissive
control
and
tripping
of
automatic
equipment,
and for
ground
detection
on
equipment
and feeders.
Figure
10
shows
the
typical
connections
for
the
application
of
an
IAVS1A
relay
for
protection against
overvoltage
in
a
three-phase
system.
The
IAV52A
can be
used
for
applications
requiring
two
trip-output
circuits.
The
operating-time
characteristics
for
these
relays
are
shown
in
Figure
12.
Figure
1
1
shows
the
connection
diagram
for
1AV53
over-
and
undervoltage
relays.
The
IAV53A
has
separate
normally-open and
normally-closed
contacts with
seal-in
units
on
each
contact.
A
typical
application
for
permissive
control
and
tripping
of
automatic
equipment
would
utilize
the
normally-open
contact
to
enable
the
machine
breaker-closing
circuit
when
normal
machine
voltage
is
present,
and
the
normally-closed
contact
to
operate
the
machine
breaker-trip
circuit
for
undervoltage
conditions.
The
operating-time
characteristic
for
the
IAV53A,
IAV53B,
IAVS3K
and
IAVS3L
relays
are
shown
in
Figure
13.
The
IAV53D
and
IAV53N
time
characteristics
are
shown
in
Figure
14.
The IAV53C
is
designed
for
ground-fault
protection,
and
would
normally
be
applied
with a
phase-to-neutral
connection,
giving
58%
of
rated voltage.
The
relay
is
adjusted
to
have a
10-second
operating
time
for
either
a
ground
on
the
connected
phase (0
volt
operates
the
UV
contact),
or
a
ground
on
another
phase (rated
volts
operates
the
OV
coil).
These
instructions
do
not
purport
to
cover
alt details
or
variations
in
equipment
nor
provide for
every
possible
contingency
to
be
met
in
connection
with
installation,
operation
or
maintenance.
Should
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser’s
purposes,
the
matter
should
be
referred
to
the
General Electric
Company.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI,
IEEE and
NEMA
standards;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they vary
greatly.
3

GE
H-I
814
RATINGS
AND
BURDENS
The
operating-circuit
ratings
avaIabIe
are shown
in
Table
I.
The
operating
coil
will
stand
rated
voltage
continuously
on
any
tap,
and
will
stand
tap
voltage continuously
on
the
taps
above
rated
voltage.
TABLE
I
VOLTAGE
RATINGS
RELAY
60Hz 50Hz
IAV51A 115
115
208
208
230
230
460
460
IAV52A 115
115
199
199
230
230
460
IAV5A
115
115
IAV53K
230
230
460
IAV53B
115 115
IAV53L
230 230
460
IAVS3C
115 115
IAVS3M
199
199
IAV53D
115
IAV53N
240
The
current-closing rating
of
the
contacts
is 30
amperes
for
voltages
not
exceeding
250
volts.
The
current-carrying
ratings
of
all
but
the
IAV53C
and
IAV53M
are
affected
by
the
selection
of
the
tap
on
the
seal-in
coil
as
indicated
in
Table II.
TABLE
II
TAP
FUNCTION
02
2.0
0.6
2.0
DC
Resistance
±
10%
8.3
0.24
0.78 0.18
Minimum
Operating
“I”
0.2 2.0
0.6 2.0
Carry
“I”
Continuously (amperes)
0.37
2.3
1.2
2.6
Carry3oampsfor
(seconds)
0.05
2.2
0.5
3.5
Carry
lOampsfor
(seconds)
0.45
20
5.0
30
60
Hz
‘1”
(ohms)
50
0.65
6.2
0.65
50
Hz
‘7”
(ohms)
42
0.54
5.1
0.54
4

GEH-1814
The tap
setting
used
on
the
seal-in
element
is
determined
by
the
current
drawn
by
the
trip
coil.
The
0.2
ampere
tap
is
for use
with
trip
coils
that
operate
on
currents
ranging
from
0.2
up
to
2.0
amperes at
the
minimum
control
voltage.
If
this
tap
is
used
with
trip
coils
requiring
more
than
two
(2.0)
amperes,
there
is
a
possibility
that
the
eight
ohm (8Q)
resistance
will
reduce
the
current
to
so
low a
value
that
the breaker
will be
tripped.
The
two-ampere
(2
.0
amp)
tap
should
be
used
with
trip
coils that
take
two amperes
or
more
at
minimum
control
voltage,
provided
the
tripping
current
does
not
exceed
30
amperes
at
the
maximum
control
voltage.
If
the
tripping
current
exceeds
30 amperes,
an
auxiliary
relay
should
be used,
the
connections
being
such
that
the
tripping
current
does
not pass
through
the
contacts
of
the
target/seal-in
coil
of
the
protective
relay.
The above
data
in
regard
to
contact
rating
apply
to
all
relays
covered
by
these
instructions
except
the
Types
IAV53B
and
IAV53D,
which
do
not
have seal-in
units.
In
these
cases,
the
contact
ratings
are limited
in
their
current-carrying
capacity
by
the
interrupting
ratings
as
shown below:
FUNCTION
VOLTS
AMPERES
AC
DC
Makeand
125
1.5
0.3t
interrupt
250
0.75
0.1Sf
at
600
0.00
0.00
f
Noninductive
Load
Representative
burdens
for
the
various
relay
types
are
given
in
Table
Ill.
TABLE
III
RELAY
VOLTAGE
TAPtf
VOLT-
POWER
TYPES
RATING
SETTING
AMPS
FACTOR
WATTS
60
-
CYCLE
BURDENS
115
140
1.3
0.34
0.4
120
1.8
0.35
0.5
IAV51A
105
2.4
0.34
0.7
&
93
3.1
0.33
0.9
IAV52A
82
3.9
0.32
1.2
70 5.4
0.31
1.7
64
6.6
0.31
2.1
55
9.2
0.35
3.2
IAV53A, 115 140
2.2
0.32 0.7
IAV53B,
120
3.0
0.30 0.9
IAV53D
105
4.0
0.31
1.2
IAV53K
93 5.4
0.31
1.7
IAV53L
82 7.0
0.32
2.2
&
70 9.9
0.34
3.4
IAV53N
64
12.0
0.36
4.3
55
17.0
0.39
6.6
IAV53C
&
53M
115
NO
TAPS
5.7
0.29
1.7
tt
Minimum
pickup
volts
5

GEH-1
814
TABLE
III
(continued)
RELAY
VOLTAGE
TAPtt
VOLT-
POWER
TYPES
RATING
SETTING
AMPS
FACTOR
WATTS
50- CYCLE
BURDENS
IAV51A
115
140
12
0.34
0.4
&
120
1.6
0.34
0.5
IAVS2A
105
2.1
0.34
0.7
93
2.8
0.38
1.9
82
16
0.36
1.3
70
5.1
0.34
1.7
64
6.2
0.34
2.1
55
8.2
0.34
2.9
IAV53A,
115
140
1.9
0.32
0.6
1AV538,
120
2.5
0.30 0.8
)AV53D 105
3.4
0.29
1.0
IAVS3K
93
4.6
0.31
1.4
IAVS3L
82
6.0
0.32
1.9
&
70
8.4 0.35
2.9
IAVS3N
64
12.9
0.29
3.7
55
13.2
0.35
4.6
IAV53C&53M
115
NOTAPS
4.8 0.32
1.6
ft
Minimum
pickup
volts
CHARACTERISTICS
The
Type-IAV51A
is
an
overvoltage
relay with single-circuit
closing
contacts
that
close
when
the
voltage
increases
to
pickup value,
as
set
on
the
tap
block.
The
time delay
in
closing
the
contacts
is
determined
by
the setting
of the
time
dial
at
the top of
the
shaft.
The
time/voltage
characteristics
of
this relay
are
shown
in
Figure
12.
The
IAV52A
relay
is
similar
in
every
respect
to the
IAV51A
relay,
except
that
it
has
additional
contacts
for
closing
a
second
circuit.
The time/voltage
characteristics
are
shown
in
Figure
12.
The
IAV53A
relay
is
an
under-
and overvoltage
relay
with
double-throw
contacts.
The
left-
hand contacts
close
as
the
voltage
increases
to
some
predetermined
value.
The right-hand
contacts
close
when
the
voltage decreases
to
some
lower
value.
Between
these
two
voltage
values,
both
contacts
are
open.
Time/voltage characteristics
are shown
in
Figure
13.
The
Type
IAV53B
relay
differs
from
the
Type
IAV53A
relay in
that it
does
not
have
seal-in
elements.
Time/voltage
characteristics
are
shown
in
Figure
13
The
Type
IAV53C
and
IAV53M
relays
are
similar
to
the
Type
IAV53A
relay
except
that
there
are
no
taps
on
the coil.
The
relay is
adjusted
to
close its
right
contacts
in
10
seconds
when
the
voltage
is
reduced
from
58% rated
voltage
to
zero
(0)
voltage;
with this
calibration
the
relay
closes its
left contacts
in
approximately
10
seconds
when
the
voltage
is
increased
from
58%
of
rated
voltage
to
rated
voltage.
These
relays
are
used
connected
line-to-ground
so
that
under
normal
conditions
the relay
receives
58%
of
rated
phase-to-phase voltage,
and
both
relay
contacts
are
open.
If
the
phase
to
which
the
relay
is
connected
is
grounded,
the
relay
voltage
goes
to
zero
(0)
and
the right-hand
contacts
close
in
10
seconds.
If
either
of
6

GEH-1814
the
other
two
phases
are grounded,
the
relay
voltage
increases
to
rated voltage
and
the
left-hand
contacts
close
in
approximately
10
seconds.
The
IAV53D
relay
is
similar
to the
Type
1AV538
relay
except
that
it
has a
shorter
time
curve.
Time/voltage
characteristics are shown
in
Figure
14.
The Type
IAV53K
is
similar
to
the
Type
IAVS3A,
IAV53L
to
IAVS3B,
IAV53M
to
IAVS3C
and
IAV53N to
IAV53D.
While
the
IAV53A,B,C,
&
D
are in
single-end
cases,
the
IAV53K,
L,
M,
and
N
relays
are
in
the
double-end
case,
with
contacts
connected
between
the
upper
and
lower
blocks
and
operating
coils
connected
to
both
blocks.
The
purpose
of
this
is
to
avoid
false
tripping
of
the
breaker
if
the
connecting
plugs
are
removed
and
subsequently
reinserted
with
the
relay
in
the
reset
position,
i.e.,
circuit-opening
contacts
closed.
Insertion
of
either
plug
causes
the
relay
to
pick
up;
both
plugs
must
be
in
place
before
the
contact
circuits
are
completed.
See
internal connections
Figures
1
-
8
for
coil and
contact
circuits,
and
Figures
10
and
11
for
external
connections.
CONSTRUCTION
These
relays
are
of
the
induction-disk
construction.
The
disk
is
actuated
by
a
potential
operating
coil
on
a
laminated
U-magnet.
The
disk
shaft
carries
the
moving
contact,
which
completes
the
trip
or alarm
circuit
when
it
touches
the
stationary
contact
or
contacts.
The
disk
shaft
is
restrained
by
a
spiral
spring
to
give
the
proper
contact-closing
voltage,
and
its
motion
is
retarded
by
permanent
magnets
acting
on
the
disk to
give
the
correct time
delay.
There
is
a
seal-in
unit
mounted
to
the
left
of
the
shaft
of
all
but
the
IAV53B,
D,
L
and
M
models,
as
shown
in
Figure
15.
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.
The
case
is
suitable
for
either
surface
or semi-flush
panel
mounting
and
an assortment
of
hardware
is
provided
for either
mounting.
The
cover
attaches
to
the
case,
and
carries
the
reset
mechanism
when one
is
required.
Two
of
the cover screws
have
provision
for
a
sealing
wire.
The
case has
studs or
screw
connections
at
both
ends
(IAVS3K,
L.
M,
or
N)
or
at
the
bottom
only
(IAV51
and
52A, and
IAV53A,
8,
C,
and
D)
for the
external
connections.
The
electrical
connections
between
the
relay
units
and
the
case
studs
are made
through
spring-backed
contact
fingers
mounted
in stationary
molded
inner
and
outer
blocks,
between
which
nests
a
removable
connecting
plug
(two plugs
for
the
IAV53K,
L,
M, and
N
models)
that
completes
the
circuits.
The outer
blocks,
attached
to
the
case,
have
the
studs
for the
external
connections,
and
the
inner
blocks
have
the
terminals
for the
internal
connections.
The relay
mechanism
is
mounted
in
a
steel
framework
called
the
cradle
and
is
a
complete
unit,
with
all
leads
being
terminated
at
the
inner
block.
This cradle
is
held
firmly
in
the
case
by a
latch
at
the
top and
bottom
and by
a
guide
pin
at
the
back
of
the
case.
The cases
and
cradles
are
so
constructed
that
the
relay
cannot
be
inserted
in
the
case
upside
down.
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
fastened
to
the
case
by
thumbscrews,
holds
the
connecting
plug
in
place.
To
draw
out
the
cradle
from
a
single-ended
case,
the
cover
must
first
be
removed.
Then
the
connecting
plug
can be
drawn
out.
In
so doing,
the
trip
circuit
is
first
opened,
then
the
7

GEH-1
814
voltage
circuits
are
opened.
After
the
connecting
plug
has
been
removed,
the
lower
latch
can
be
released
and
the
cradle
easily
drawn out.
To
replace
the
cradle,
the
reverse
order
should
be
followed.
The
cradle
can
be
drawn
out
from
a
double-ended
case
in
the
same
way,
except
that
two
connecting
plugs
must
be
drawn
out
first.
RECEIVING,
HANDLING
AND STORAGE
RECEIVING
These
relays,
when
not
shipped
as
a
part
of
a control
panel,
will
be
shipped
in cartons
designed
to
protect
them
against
damage.
Immediately
upon receipt
of
the
relay,
an
examination
should
be
made
for
any
damage
sustained during shipment.
If
injury
or
rough
handling
is
evident,
a damage
claim
should
be
filed
at
once
with
the
transportation
company,
and
the
nearest
General
Electric
Sales
Office
should
be notified
promptly.
HANDLING
Reasonable
care
should
be exercised
in unpacking
the
relay
in
order
that
none
of
the
parts
are
damaged
nor
the
adjustments disturbed.
STORAGE
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.
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.
If
no
pickup
value
for
the
left
contact
is
specified
on
the
requisition
for
the
relays
with
tap
blocks,
the
relay
is
shipped
with
the tap
plug
in
the
fifth
tap.
If
pickup
is
specified,
the
tap
plug
is
set
in
the
tap
corresponding
to
this
value.
If
a
specified
value
does
not
coincide
with
one
of
the
taps,
the
tap
plug
is put
in
the
tap
nearest
the
required
value
(the lower
tap
is
used
if
the
value
is
half
way
between
two
taps)
and
the
spring
is
adjusted
to
obtain
the
required
pickup.
VISUAL
INSPECTION
Check
the
nameplate
stamping
the
make
sure
that
the
model
number
and rating
of
the
relay
agree
with
the
requisition.
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
ct
secondary
circuits
from
being
open.
8

GEH-1814
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
shorting
bars
are in the proper location(s) and that they are properly
formed
(see
Figure
9).
MECHANICAL INSPECTION
1. On relays that have time
dials,
the
dials will be set at zero
(0)
before
the
relay leaves
the
factory. It is necessary
to
change
this setting
in
order
to
open the relay contacts.
2. On
all relays with locked time dials, make
sure the two
time-dial
locking screws
are
tight. These locking screws
are
to prevent
the dial from moving
when the relay is
subjected to
high operating torque.
3.
The moving
contact
should be fastened securely
in its
support and should
engage the
stationary contact about
in
the
middle,
or at
least 1/16 inch inside, the periphery of
the
stationary contact.
4.
The stop-arm leaf spring should
deflect
about 1/64
inch and the
stop
arm should clear
the molded block by at least
.020 inch.
5.
Any foreign material must be
cleared out of all air gaps. Clearance
between the disk
and either
the
drag
magnet
or U-magnet should be at least
0.010 inch for any
position of the
disk.
6
End play
of
the
disk should be
from
0.005
inch
to
0.010 inch. End play should not be
so
great as to
allow the disk to
strike the U-magnet or the drag
magnet. Check that
top
and bottom
pivot and bearing screws are tight.
7.
There
should be
no noticeable
friction in the rotating structure.
8. Rotate the time dial to
the zero position (0). Check by
means of
a neon
lamp that the
contacts
just
close. There should be
approximately
1/32
inch wipe on the stationary
contact. If the contact does
not close, adjust the
disk position
by
backing off the two
clamping screws
on the stop arm and
rotating the stop arm relative to the cutout
in
the
disk. This provides a coarse
adjustment. Retighten the
clamping screws.
For fine adjustment of
contact
closing, run the
stationary
contact brush in or out by
means
of its adjusting screw, after
this
adjustment,
check that the screw is held
firmly
in
its
support.
9.
On double-throw relays, the
support
post
of the upper
spring
should clear the
insulating plate by at
least 1/64 inch.
ELECTRICAL TESTS
A.
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 way 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
1 2XLA1
3A test
plug.
This plug makes
connections only
with the
relay, and does not disturb any shorting
bars
in
the case. Of
course,
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.
9

GEH-1814
B.
Power
Requirements,
General
All
devices
operating
on
alternating
current
(AC)
are
affected
by
frequency.
Since
non-sinusoidal
waveforms
can
be analyzed
as
a
fundamental
frequency
plus
harmonics
of
that
fundamental
frequency,
it follows
that
alternating-current
devices
(relays)
will
be
affected
by
applied
waveforms.
AC
relays
(and
AC devices
in
general)
are
significantly
affected
by the
application
of
non-sinusoidal waveforms.
Therefore,
in
order
to
test
AC
relays
properly it
is
essential
to
use
a
test
voltage
and/or
current
waveform
that
is
sinusoidal.
The
purity
of
the
sine
wave
(i.e.,
its
freedom
from harmonics)
cannot
be
expressed
as
a
finite
number
for
any
particular
relay;
however,
any relay using
tuned
circuits,
RL
or
RC
networks,
or
saturating
electromagnets
(such as
time-overcurrent
relays)
would
be
especially
affected
by
non-
sinusoidal wave
forms.
Similarly,
relays
requiring
DC
control
power
should
be
tested
using
DC
power
and
not
full
wave rectified power.
Unless
the
rectified
supply
is
well
filtered,
many
relays
will
not
operate
properly
due
to
the
dips
in
the
rectified
power.
Zener
diodes, for
example,
can
turn
off during
these
dips.
As a
general
rule,
the
DC
source
should
not
contain
more
than
5%
ripple.
C.
Pickup
Voltage Test
The
pickup
voltage
should
be
checked
on one
or more
taps
on
relays
that
close
contacts
on
increasing
voltage.
The
pickup
voltage
should
be
tap
value
±
5%.
The
drop-out
voltage
should
be
checked
on
one
or
more
taps
on
relays
that
close
contacts
on
decreasing
voltage. The
dropout
voltage
is
a
variable
depending
upon user
requirements.
Refer
to
the
VOLTAGE
SETTING
section under
SERVICING
AND
ADJUSTMENTS
See
relay
nameplates
for values
of pickup
or
dropout
voltages
(closing
voltages,
right
or
left
contact).
D.
Time-Voltage
Test
The
time/voltage
curves
should
be
checked
for
one
or more
settings.
Recommended
test
connections
for
the
above
test
are
shown
in
Figure 17
for
the
overvoltage
relays,
such
as
the
Types
IAV51A
and
IAV52A. The
under-
and
overvoltage
relays,
such as
the
Types
IAV53A,
IAV53B,
IAV53C,
IAV53D,
IAV53K,
IAV53L,
IAV53M
and
IAV53N,
can
be
checked for
time
of
closing
left
contacts
by
using
connections
shown
in
Figure
17, and
for closing
right
contacts
by
connections
shown
in
Figure
18.
Of
course
the
seal-in
unit
shown
in the
figure
is
not
used
in
the
case
of
the
IAV53B
and
IAVS3D,
but
all
stud
numbers are
correct
for
these
relays.
Stud
numbers
1 and
2
should
be
substituted
for stud
numbers
9
and
10
on
Figure
18
for
testing
the
undervoltage
contacts
of the
Type
IAV53C
relay
(See
internal diagram,
Figure
5).
See
internal
connections,
Figures
1-5 for
contact
and
coil
connections for
IAV51A, IAV52A,
IAV53A, B,
C &
D and
Figures
6 - 8,
for
IAV53K,
IAV53L,
IAV53M
and
IAV53N.
10

GEl-I-i
814
INSTALLATION
INSPECTION
At
the
time of
installation,
the relay
should
be
inspected
for
tarnished
contacts,
loose
screws, or
other
imperfections.
If
any
trouble
is
found,
it
should
be
corrected
in
the
manner
described
under
MAINTENANCE.
Check
the
nameplate
for
model
number
and rating.
LOCATION
The
location should
be
clean
and
dry,
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
19
for
relay
Types
IAV51A,
IAV52A
and
1AV53C
Figure
20
shows
outline
and panel
drilling
for
relay
Types
IAV53A,
IAVS3B
and
IAVS3D.
Figure
21
shows
the
outline
and
panel
drilling
for
relay
Types
IAVS3K,
IAV53L,
IAVS3M
and
IAVS3N.
CONNECTIONS
Internal
connections
are shown
in
Figures
ito
8
for
the
various
relays.
GROUND
CONNECTIONS
One
of
the
mounting
studs
or
screws
should
be
permanently
grounded
by
a conductor
not
less
than
No.
12
B&S
gage
copper
wire
or
its
equivalent.
FIELD
INSTALLATION
TESTS
Before
the
relay
is
put
in
service,
the pickup
voltage
and
time/voltage
tests
described
in
ACCEPTANCE TESTS
(ELECTRICAL
TESTS)
should
be
made,
to
determine
that the
adjustments
have
not been
disturbed.
The relay
may
be
tested
while mounted
on
the
panel,
either
from
its
own
or
another
source
of
power,
by
inserting
a
separate
testing
plug
in
place
of
the
connecting
plug.
Or,
the
cradle
can be
drawn
out
and
replaced
by
another
that
has
been laboratory
tested.
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.
It
is
recognized
that
the
interval
between
periodic
checks
will
vary
depending
upon
environment, type
of
relay
and
user’s
experience
with
periodic
testing.
Until
the
user has
accumulated
enough
experience
to
select
the
test
interval
best
suited
to
his
indwidual
requirements,
it
is
suggested
that
the
points
listed
under
INSTALLATION
be checked
every
six
months.
DISK
AND
BEARINGS
The lower
jewel
may be
tested
for
cracks
by
exploring
its
surface
with
the point
of
a
fine
needle.
If
it
is
necessary
to
replace
the
jewel,
the
jewel
should
then
be
turned
up until
the
disk is
centered
in
the
air
gap,
after
which
it
should
be locked
in
position
by
the set
screw
provided
for
the
purpose.
11

GEH-1814
CONTACT
CLEANING
For
cleaning
fine
silver
contacts,
a
flexible
burnishing
tool
should
be
used. This
consists
of
a
flexible
strip
of
metal
with
an
etch-roughened
surface,
resembling
in
effect
a
superfine
file.
The polishing action
is
so
delicate
that
no
scratches
are
left,
yet
corroded
material
will
be
removed
rapidly
and
thoroughly.
The
flexibility
of
the
tool
ensures
the
cleaning
of
the
actual
points
of
contact;
sometimes
an
ordinary
file
cannot
reach the
actual
points
of
contact
because
of
obstruction
from
some
other
part
of
the
relay.
Fine
silver
contacts
should
not
be
cleaned
with
knives,
files
or
abrasive
paper
or
cloth.
Knives
or
files may
leave
scratches
that
increase arcing
and
deterioration
of
the contacts.
Abrasive
paper
or
cloth
may
leave minute
particles
of
insulating
abrasive
material
in
the
contracts,
and
thus prevent
closing.
The
burnishing tool
described
above
can
be
obtained
from
factory.
SERVICING
AND
ADJUSTMENTS
TARGET AND
SEAL-IN
UNIT
For
trip
coils
operating
on
currents
ranging
from
0.2
up
to
2.0
amperes
at
the
minimum
control
voltage,
set
the
target
and
seal-in
tap
plug
in
the
0.2-ampere
tap.
For
trip
coils
operating
on
currents
ranging
from
2.0
up
to
30
amperes
at
the
minimum
control
voltage,
place
the
target
and seal-in
tap
plug
in
the
2.0-ampere
tap.
The
tap
plug is
the
screw
holding
the
right-hand stationary
contact
of
the
seal-in
element.
To
change
the
tap
setting,
first
remove
the
connecting
plug. Then,
take
a
screw
from
the
left-hand
stationary
contact
and
place
it in
the
desired
tap.
Next, remove
the
screw from
the
other,
undesired,
tap,
and
place
it
in
the
left-hand
contact.
This
procedure
is
necessary
to
prevent
the right-hand
stationary contact
from
getting
out
of
adjustment.
Screws
should
not
be
in
both
taps
at
the
same time,
as
pickup
for
direct
current
(DC)
will
be
the
higher
tap
value,
and
AC
pickup
will be
increased.
VOLTAGE
SETTING
The
voltage
at
which
the
contacts
operate
may
be
changed
by
changing
the
position
of
the
tap
plug in
the
tap
block
at
the
top of
relays such
as
the
IAV51A, IAV52A,
IAV53A,
IAV53B,
IAVS3D,
IAV53K,
IAV53L,and
IAV53N
which
have tapped
coils.
The
range
of
this
adjustment
is from
55
to
140 volts
on
the
115
volt
ratings,
70
to
140
volts
on
the 199
volt
ratings,
110
to
280 volts
on
the
208, 230
and
240
volt
ratings,
and
220
to
560
volts
on
the
460
volt
ratings.
The
pickup
of
the
relay
for
any
voltage
tap
is
adjusted
by
means
of
a
spring-adjusting
ring
(see Figure
1
5).
The
ring
may
be
turned
by
inserting
a
tool in
the notches
around
the
edge.
By
turning
the ring,
the
operating voltage
of
the
relay
may
be brought
into
agreement
with
the
tap
setting
employed
if,
for
some
reason, this
adjustment
has
been
disturbed.
The
adjustment
also permits
any
desired
setting
between
the
various
taps.
The
relay
is
adjusted
at
the
factory
to
operate
from
any
time-dial
positions
at
a
minimum
voltage
within
five
percent
(5%) of
the
tap
setting
for
the
relays
with
the tapped
coils,
mentioned
above.
The
relays
reset
at
90%
or more
of
the
operating
value
on
alt
the
overvoltage
relays.
Operating
voltage
for
the
overvoltage
relays
for
a
given
tap
setting is
the
minimum
voltage
at
which
the
contacts
just
make.
12

GEH-1814
On
the
under-
and
overvoltage
relays,
such
as
the
IAVS3A, IAVS3B,
IAVS3C,
IAVS3D,
IAVS3K,
IAVS3L,
IAV53M,
and
IAV53N, the operating
voltage
for
a
given
tap
setting is
the
minimum
voltage
at
which the
left-hand
contacts
close.
The
right-hand contacts
will
then
close
at
a
certain
percentage
of
operating
voltage.
If
it
is
desired
to
change
this
percentage,
the
right-hand
moving
contact
may
be
rotated
on
the
shaft
after
first
loosening
the
clamping
screws
that
hold
it
in
place.
Changing
the
position
of
this (right)
contact
provides
a
means
of
adjusting
the
voltage
that
closes
the
right-hand
contacts
to
a
setting
between
50%
and
95%
of
the
voltage
needed
to
close
the
left-hand
contacts.
Changing
the
position of
the
right-hand
contacts
also
changes
the
voltage
at
which
the
left-hand
contacts
close,
however.
Hence, simultaneous
adjustments
for
closing
left
(see
preceding
paragraph)
and
right contacts
must
be
made
to
obtain
a
desired characteristic.
TIME
SETTING
The
time
of
operation
of
the
overvoltage
relays is determined
primarily
by
the
setting
of
the
time
dial,
while
that for
the
under-
and
overvoltage
relays is
determined
by
the
spread
of
the
contacts,
as
explained
under
VOLTAGE
SETTING
.
Further
adjustment
is
obtained
by
moving
the
permanent
magnet
along
its
supporting
shelf;
moving
the magnet
in
toward
the
back
of
the
relay
decreases
the
time,
while moving
it out
increases
the
time.
Figure
12
shows
the
time/voltage
characteristics
of
the
Type
IAVS1A
and
IAV52A relays,
with
the
dial
setting
for
obtaining
each
characteristic.
To
make
time
settings, set
the
time
dial to
the
number
required
(to
give
the
desired
characteristic)
by
turning
it
until
the
number
lines up
with
the
notch
in
the
adjacent
frame.
The
time indicated
by
the
curves
is
the
time
required
to
close
the
relay
contacts
when
the
voltage
is suddenly
increased
from
a
value
below
pickup
to
the
value on
the
curve.
Figure
13
shows the
characteristics
of
the
IAVS3A and
IAVS3K,
and
IAVS3B
and
IAV53L
relays.
The
time
characteristic
of
the
relay
is
automatically
determined
by
the
setting
of
the
ratio
of
the
voltage
to
close
the
right
contacts
to
the
voltage
to close
the
left
contacts.
Figure
14
shows
the
time/voItage
characteristics of
the
Type
IAV53D
and
IAVS3N
relays.
No
curve
is
given
for
the
Type
IAVS3C and
IAVS3M:
their
time/voltage
characteristics
are
explained
under
the
section
heading
CHARACTERISTICS.
The
time/voltage
characteristics are
plotted
in
percent,
thus
making
them
applicable
for
all
tap
settings.
BEARING
AND
CONTACTS
See
PERIODIC
CHECKS
AND
MAINTENANCE.
RENEWAL
PARTS
It
is
recommended
that
sufficient
quantities
of
renewal parts
be
carried
in stock
to
enable
the
prompt
replacement
of
any
that
are worn,
broken or
damaged.
Parts
bulletin
number
GEF-3897
gives
a list
of
those
most
subject
to
wear
in ordinary
operation
and most
likely
to
be
damaged
due
to
possible
abnormal
conditions.
When
ordering
renewal
parts,
address
the nearest
Sales
Office
of
the
General
Electric
Company,
specify
the
quantity
and
the
name
of
the
part
wanted,
as
shown
in Figures
iS
and
16,
and
give
complete
nameplate
data,
including
serial
number.
If
possible
give
the
General
Electric
Company’s
requisition
on
which
the
relay
was
furnished.
13

GEH-1814
LIST
OF
FIGURES
FIGURE
DESCRIPTION
PAGE
1
Internal Connections
of
the
Type-IAVS1A Relay,
Front
View
15
2
Internal
Connections
of
the
Type-IAV52A
Relay,
Front
View
16
3
Internal
Connections
of
the
Type-IAVS3A
Relay,
Front
View
17
4
Internal Connections
of
the
Type-IAV53B
and
-IAVS3D
Relays,
Front
View
18
5
Internal
Connections
of
the Type-IAVS3C Relay,
Front
View
19
6
Internal
Connection Diagram for
Type-IAV53M Relay
20
7
Internal-Connection
Diagram
for
Type-IAVS3K
Relay
20
8
Internal-Connection
Diagram
for
Type-IAVS3L
and -IAV53N
Relays
20
9
Cross
Section
of
Drawout Case
Showing
Position
of
Auxiliary
Brush
21
10
Connection Diagram
for
the
Type-IAVS1A
and
IAV52A
Relays
used
for
Overvoltage Protection
22
11
Connection
Diagram
for
the
Type-IAVS3
Relay
23
12
Time-Voltage
Curves
for
Type-IAVS1
A and
-IAV52A
Relays
(±
15%
Tolerance)
24
1 3
Time
Voltage
Curves
for
Type-IA
V53A
1AV538,
-IAVS3K
and
-IAVS3L
Relays
(±
15%
Tolerance)
25
14
Time-Voltage
Curves
for
Type-IAVS3D
and
-IAV53N
Relays
(±
15%
Tolerance)
26
15
Front
View
of
Type-IAV51A
Relay,
Withdrawn
From
Case
27
16
Back
View
of Type-IAVS1A Relay,
Withdrawn
From
Case
28
17
Test
Connections
for Overvoltage
Relays
29
18
Test
Connections
for
Undervoltage
Contacts
of Over-
and
Undervoltage
Relays
30
19
Outline
and
Panel
Drilling
for
Relay
Types
IAVS1A,
IAV52A,
IAVS3C
31
20
Outline
and
Panel
Drilling
for
Relay
Types
IAVS3A,
IAVS3B
and
IAVS3D
32
21
Outline and
Panel-Drilling
Dimensions
for
Relay
Types
IAV53K,
IAVS3L,
IAVS3M
and
IAV53N
Relays
33
Since
the last
edition,
the
GEF
number
has
been
changed
in the
RENEWAL
PARTS
section
and
Figure
1
has
been
retraced.
14

GEH-1814
SEAL—IN
OPERATI
NC
COIL
RESISTOR
“WHEN
USED”
SHORT
FINGER
Figure
1
(K-6209664 [71)
Internal
Connections
of
the Type-IAVS1
A
Relay,
Front
View
1
26
15

GEH-1814
SEAL—I
1’
UN
I
T
OPERATING
Co
t
L
Figure
2
(K-6209665-3)
Internal
Connections
of
the
Type-IAVS2A
Relay,
Front
View
I!’’
TT
*
6
16

GEH-1814
1!
1
OPERATING
SEANJ 1
SEALIN
Figure
3
(K-6209666-3)
Internal Connections
of the Type-IAVS3A
Relay,
Front View
17

GEH-1814
Figure
4
(K-6400143-2)
Internal Connections
of
the Type-IAV53B
and
-IAV53D
Relays,
Front
View
I
OPERATING
COIL
= SHORT
FINGER
6
18