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1.
M ak e su re that the ta p screw is in the desi red ta p.
2.
Pe rf orm picku p and d rop- out tests as outl i ned i n the
1.
Sel ect the d esi red ra nge by setting the l i nk in the p roper positi on. { See Figu re 1
and th e i nternal -co n n ections d i a g ram.) W h enever possibl e, sel ect the h i g h e r
ra n g e si nce i t has a h i g her conti nu ous rating.
2.
Set the i nsta nta n eou s u n it to pick u p at the desi red cu rrent l evel. See Sett i ng T h e
All tests d escrib ed ab ove u nder IN STAL LATI ON TE STS must b e performed at the t i m e of
i n stallatio n. I n additi o n , if the tests d escri b e d u n d er t h e
n ot performed prior to i nstall ation, it is recommended they b e performed at t h i s t i m e.
I n view of the vital rol e of p rotective rel ays i n the operati on of a pow e r syste m, it is
i m portant that a period ic test prog ra m b e foll ow ed. It is recog n i z ed that the i nterval
b etw een period ic check s w ill va ry depend i n g u pon environ ment, type o f rel ay, a nd the
u se r' s ex perience w ith testing. U ntil the user has accu mul ated enou g h ex peri e n ce to
sel ect the test i nterval b est su ited to h is i n d ividu al requ i rements, it is su g g ested that the
poi nts l isted b el ow be check ed at a n i nterval of from one to tw o yea rs.
These tests a re i ntended to ensu re that the rel a ys h ave not deviated from th e i r o ri g i n al
I f d eviations a re e n cou ntered, the rel a y must b e retested a n d se rvi ced as
TI ME-OVE RCU RRENT UN IT
1.
Perform th e picku p test as describ ed i n the
sett i n g i n s e rvice.
2.
Perform the time test as describ ed i n the
H IGH -SE I SM I C IN STANTANE OU S UN IT
1.
Check that the i nsta nta 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
H IGH-SE I SM I C TARGET AND SE A L -IN UN IT
1.
Check that the u n it picks u p at the valu es show n in Tabl e X I.
2.
Check th at the u n it d rops out at 2 5% or more of ta p valu e.
GEK-49950
PERIODIC CHECKS AND ROUTINE MAINTENANCE
section.
ACCEPTANCE TESTS
ACCEPTANCE TESTS
ACCEPTANCE TESTS
INSTALLATION
INSTALLATION
1 4
section.
section.
section w e re
section for the ta p
section.
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