GE IAC

GEK
-
86054
INSTANTANEOUS
UNIT
1
.
Select
the
desired
range
by
making
the
proper
connections
at
the
rear
of
the
relay
(
See
Internal
-
Connections
Diagram
)
.
select
the
higher
range
since it
has
a
higher
continuous
rating
.
Whenever
possible
,
be
sure
to
2
.
Set
the
instantaneous
unit
to
pick
up
at
the
desired
current
level
.
SETTING
THE
INSTANTANEOUS
UNIT
in
the
ACCEPTANCE TESTS
section
.
See
All
the
tests
described
above under
Installation
Tests
must
be
performed
at
In
addition
,
if
those
tests
described
under
the
ACCEPTANCE TESTS
section
were
not
performed
prior
to
installation
,
it
is
recommended
they
be
performed
at
this
time
.
the
time
of
installation
.
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
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
interval
of
from
one
to two
years
.
These
tests
are
intended
to
make
sure
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
.
TIME
-
OVERCURRENT
UNIT
1
.
Perform
Pickup
Test
as
described
in
the
ACCEPTANCE TESTS
section
for
the
tap
in
service
.
2
.
Perform
the
Time
Test
as
described
in
the
ACCEPTANCE TESTS
section
.
INSTANTANEOUS
UNIT
1
.
Check
that
the
instantaneous unit
picks
up
at
the
desired
current
level
,
as
outlined
in
the
ACCEPTANCE TESTS
section
.
TARGET
AND
SEAL
-
IN
UNIT
1
.
Check
that the
unit
picks
up
at
the
values
shown
in
table
XI
.
Check
that
the
unit
drops
out
at
30
%
or more
of
tap
value
.
2
.
CONTACT CLEANING
For
cleaning
relay
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
it
will
clean
off
any
corrosion
thoroughly
and
rapidly
.
Its
flexibility
ensures
the
cleaning
of
the actual
points
of
contact
.
Do
not
use
knives
,
files
,
abrasive
paper
or
cloth
of
any
kind
to
clean
relay
contacts
.
14
Courtesy of NationalSwitchgear.com