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CU R RENT DETE CTOR PICKUP TEST
Hav i n g ch ecked o r adjus ted the fi l l - i n t i me sett i n g pe r above, s e t up the tes t
cur rent ci rcu i t o f F i gure 3 5 .
Conn ect a n o s c i l l o scope such that t h e v e r t i cal i nput i s co nnected t o TP4 o f t h e "A"
ca rd a n d re fe re nce i s co n n ected to TP1 o f the "A" ca rd.
should be ungrounded.
m i l l i s eco n d s:
1.
Set a l l curre n t tap bl ocks a s fo l l ows:
2.
Set bo th curre n t rheostat po i n te rs to the 1X ra nge ba se ( fi rs t cal i bra t i o n l i n e
go i n g cl ockw i se ) .
3.
App l y cur re n t to the I A te rmi nal per F i gure 35 un t i l the o s c i l l o scope i nd i cates
a co n t i nuous DC output.
ampe re.
4.
Repeat S tep 3. above fo r p h a se B a nd phase C.
5.
App l y
curre n t
i nd i ca te s a co n t i nuous DC output.
amps.
6 .
U s i n g
th e procedure
s e tt i n gs.
To te s t t h e curre n t d etec to r p i ckup fo r fi l l - i n
use t h e above procedure except tha t the p i ckup
approx i ma te
v a l ue s
s ect i on, fo r othe r pa rameters.
CHARACTERISTICS
CURRENT DETECTOR PICKUP SETTINGS
Use t h e procedure o f t h e pre v i ous sect i o n, except s e t t h e cur re n t r h e o s ta t s to the
des i red cur ren t p i ckup; then s ecure the r h e o s ta ts.
TRIPPING TIME RS
The r h e o s ta t on t h e fro n t o f t h e re l ay a s soc i a ted w i th t h e tr i p t i me r i s i d e n t i fi e d
a s A/0.
T h e s ev e n ( 7 ) ca l i b ra t i o n ma rks wh i ch a re scr i bed repre s en t the fo l l ow i ng
o v e ra l l
tr i p
t i mes,
( mi l l i s eco nd s ) .
The "A" s i g n i fi es a co n t i nuous l y a djus tabl e p i ckup t i me del ay i n t h e ra nge o f 5 0 to
5 0 0 mi l l i s eco nds.
re al i ty, i n l e ss t h a n 200 m i l l i seco nd s ) .
GEK-45464
The fo l l owi n g te s t i s fo r a fi l l - i n t i me s e t t i n g o f 8. 7
The
i nput cur ren t mus t be approx i ma te l y o n e
to
the
3 I o
t e rm i n a l s pe r
abov e,
ch eck
pe r
F i gure
10.
re ad i n g
cl ockw i se:
The " 0" s i gn i fi e s tha t the t i me r re s e ts " i n s t a n ta n eous l y" ( i n
The oscilloscope power cord
1
1
1
0. 5
Fi gure
35
The i nput current mus t be approx i ma te l y 0. 5
the o t h e r taps a nd mul t i pl e s o f cur re n t
1
t i mes
e s s t h a n 8. 7 m i l l i s econds,
cur re n t s w i
Al so,
see
CURRENT
5 0,
7 5,
100,
2 2
un t i l
t h e o sc i l l o scope
1 1
be h i g h e r a nd have
DETECTOR,
i n
200,
3 00,
400,
( 1 )
the
5 00
""""'·
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