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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
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