GEK-34055
·transit. If injury or damage resulting from rough handling is evident, file a damage claim at once with
the transportation company and promptly notify the nearest General Electric Apparatus Sales Office.
Reasonable care should be exercised in unpacking the relay in order that none of the parts are in-
�
ed 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 ensure that
no damage has been sustained in shipment and that the relay calibration has not been disturbed. If the
examination or test indicates that readjustment is necessary, refer to the section on SERVICING.
These tests may be performed as part of the installation on acceptance 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 ensure 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
sig;1s of physical damage, and that all the screws are tight.
MECHANICAL INSPECTION
1. There should be no noticeable friction when the disk is rotated slowly clockwise. The disk should
return by itself to its rest position.
�
Make sure the control spring is not deformed nor its convolutions tangled or touching.
The armature and contacts of the seal-in unit as well as the armature and contacts of the instantaneous
(
unit should move freely when operated by hand; there should be at least 1/32" wipe on the seal in
contacts.
4. The targets in the seal-in unit and in the instantaneous unit must come into view and latch when
the armatures are 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.
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 OPENED. SEE FIGURE 1.
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 12XLA13A test plug. This plug makes connections only with the relay and does not disturb any
shorting bars in the case. The l2XLA12A test plug may also be used. Although this test plug allows
greater testing flexibility, it requires C. T. shorting jumpers and the exercise of greater care, since
connections are made to both the relay and the external circuitry.
POWER
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 properly test alternating current relays it is essential to use a sine wave
f
current and/or voltage. The purity of the sine wave (i.e. its freedom from harmonics) cannot be
Jressed as a finite number for any particular relay, however, any relay using tuned circuits, R-L or
RC networks, or saturating electromagnets (such as time overcurrent relays) would be essentially affect-
8
www . ElectricalPartManuals
. com
www
. ElectricalPartManuals
. com
