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1.
Con n ect relay studs 1 and 2 (see the tes� ci rcuit of F i g u re 1 3) to a DC so u rce,
ammeter, and load b ox so that the cu rrent can be control l ed over a ra n g e of 0. 1
to 2.0 a m peres.
T u rn the time d i a l to the zero (0) time- d i a l po sition.
2.
3.
I n crease the cu rrent slow ly u nti l the sea l- i n u n it picks u p. See Tab le X I fo r p i ck u p
cu rrent ra nge.
Move the ti me d i a l away from the zero (O) position; the sea l- i n u n it sho u l d
4.
rem a i n in the pick ed- u p position.
5.
D ecrease the cu rrent slow ly u ntil th e sea l- i n u n it d rops out. See Tab l e X I fo r
d ropout cu rrent.
Tap
0. 2
2.0
The re l ay shou ld b e i nsta l l ed i n a clea n , d ry l ocation that is free from d ust and w e l l l ig hted
to fac i l itate i nspection and testi ng.
The relay shou ld b e mou nted on a vertica l su rface. The outl i n e and panel d ri l l i ngs a re
show n i n Fi g ures 1 5 and 1 6. Fig u re 1 5 show s the semi- fl ush mounti ng and F ig u re 1 6 show s
various meth ods of su rface mou nti ng.
The i nternal- co n n ections d i a g rams fo r the relays a re show n i n F i g u res 3 a n d 4. Typ i ca l
exte rnal co n nections a re show n i n F i g u re
IN STALLATION TE STS
The fol low i n g tests a re to b e performed at the time of i nsta l l ation:
Ti me- Overcu rrent U n it
Set the ta p b lock to the desi red tap setti ng and the time d i a l to the 0.5 position. U si ng the
test ci rcu it i n F i g u re 1 1 , g rad u a l ly a pply cu rrent u nti l the contacts j ust close. T h i s va l ue of
cu rrent is defined as pick u p and should b e w ith i n 3% of ta p va l u e.
Check the operati ng time at some multi pl e of tap va lue a nd the d esi red ti me-d i a l sett i n g.
This m u lt i p l e of ta p va l u e may b e ten ( 1 0) ti mes ta p rati ng or the max i m u m fa u lt cu rrent
for w h ich the relay m ust coord i n ate. The choice of the particu l a r va l u e is l eft to the
d iscretion of the use r.
GEK-49950
TABLE X I
Pick u p Cu rrent
0. 1 2- 0. 20
1.2 - 2.0
INSTALLATION
7.
1 3
D ro pout Cu rrent
0.0 5 or more
0. 50 or more
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