GEK-49950
and Seal-In U n it
1. Mak e su re that the tap screw is in the desi red tap.
2. Perf orm picku p and d rop- out tests as outl i ned i n the
ACCEPTANCE TESTS
section.
I nstantaneous U n it
1. Select the desi red range by setting the l i nk in the proper position. { See Figu re 1
and th e i nternal-connections diagram.) W henever possibl e, select the h i g h e r
range si nce i t has a h i g her conti nu ous rating.
2. Set the i nstantaneous u n it to pick u p at the desi red cu rrent l evel. See
The
I nstantaneous U n it i n the
ACCEPTANCE TESTS
section.
All tests describ ed above u nder IN STAL LATION TESTS must b e performed at the time of
installation. I n addition, if the tests
ACCEPTANCE TESTS
section w e re
not performed prior to i nstall ation, it is recommended they be performed at this time.
PERIODIC CHECKS AND ROUTINE MAINTENANCE
I n view of the vital role of protective relays i n the operation of a power
it is
i mportant that a period ic test
b e foll owed. It is recog n i z ed that
i nterval
b etween period ic checks w ill vary
u pon environ ment, type o f rel ay, a nd the
user's ex perience w ith testing. U ntil the user has accu mul ated enou g h ex perience to
select the test i nterval b est su ited to h is individual requ i rements, it is su ggested that the
points l isted b el ow be checked at an i nterval of from one to two years.
These tests a re i ntended to ensu re that the relays have not deviated from th eir o rig i n al
I f d eviations a re encou ntered, the relay must b e retested and se rviced as
in this manu al.
TI ME-OVE RCU RRENT UN IT
1. Perform the picku p test as describ ed i n the
INSTALLATION
section for the tap
setting i n service.
2. Perform the time test as describ ed i n the
INSTALLATION
section.
H IGH -SE I SM I C IN STANTANEOUS UN IT
1. Check that the i nstanta neous u n it picks u p at the desi red cu rrent l evel , as outl i n ed
i n the
ACCEPTANCE TESTS
section.
H IGH-SE I SM I C TARGET AND SEAL -IN UN IT
1. Check that the u n it picks u p at the values show n in Table X I.
2. Check that the u n it d rops out at 2 5% or more of tap value.
1 4
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