GEK-65525
The following tests are to be performed at the time of installation.
PICKUP
Perform Directional Units pickup test as outlined in the
ACCEPTANCE TESTS
section.
Adjust pickup as desired per
SERVICING
section.
HIGH-SEISMIC TARGET AND SEAL-IN UNIT
1.
Make sure that the tap screw is in the desired tap.
2.
Perform the pickup and dropout tests as outlined in the
ACCEPTANCE TESTS
section.
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.
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 under
ACCEPTANCE TESTS
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 settings.
If deviations are encountered, the relay must be retested and
serviced as described in this manual.
PICKUP
Perform Directional Units pickup test as outlined in the
ACCEPTANCE TESTS
section.
The pickup test, checked using the connections of Figure 11, will show whether the
relay is operating correctly.
If any of the coils should become open-circuited,
then the pickup will be higher, since all three units will no longer be producing
torque.
HIG H-SEISMIC TARGET AND SEAL-IN UNIT
1.
Make sure that the unit picks up at the values shown in Table IV.
2.
Check that the unit drops out at 25% or more of tap value.
11
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