GEK-45464
CURRENT DETE CTOR PICKUP TEST
Hav i ng checked o r adjus ted the fi l l - i n t i me sett i n g pe r above, set up the tes t
current ci rcui t o f Fi gure 35.
Conn ect a n osci l l oscope such that the vertical i nput is connected to TP4 of the "A"
ca rd and re ference i s connected to TP1 o f the "A" ca rd.
The oscilloscope power cord
should be
The fol l owi ng tes t i s fo r a fi l l - i n t i me setti ng o f 8. 7
m i l l i s eco nds:
1.
Set al l curre n t tap bl ocks a s fol l ows:
1
1
1
0. 5
2.
Set bo th curre n t rheostat po i nte rs to the 1X ra nge ba se ( fi rst cal i bra t i o n l i ne
go i n g cl ockw i se ) .
3.
App l y current to the IA te rmi nal per Fi gure 35 un ti l the osci l l o scope i nd i cates
a co n t i nuous DC output.
The i nput curren t must be approxi ma te l y one ( 1 )
ampe re.
4.
Repeat S tep 3. above for phase B a nd phase C.
5.
Apply current to the 3Io term i nal s pe r Fi gure 35 un t i l the osci l l o scope
i nd i ca tes a co nti nuous DC output.
The i nput current mus t be approxi ma te l y 0. 5
amps.
6.
Us i n g th e procedure above, check the other taps and mul t i pl es o f cur re n t
s e tt i n gs.
To te st the curre n t d etecto r pi ckup fo r fi l l - i n
use the above procedure except tha t the pi ckup
approx i ma te val ues pe r Fi gure 10.
Al so,
CHARACTERISTICS
s ect i on, for othe r pa rameters.
CURRENT DETECTOR PICKUP SETTINGS
t i mes
1
ess than 8. 7 m i l l i seconds,
currents w i
1 1
be h i gher and have
see CURRENT DETECTOR,
i n the
Use the procedure o f the pre v i ous sect i on, except set the current rheosta t s to the
des i red cur ren t pi ckup; then secure the rheosta ts.
TRIPPING TIMERS
The rheosta t on the fron t o f the re l ay a ssoci a ted wi th the tr i p t i me r i s i d enti fi ed
a s A/0. The seven ( 7 ) ca l i bra t i o n ma rks wh i ch a re scr i bed repre sen t the fol l ow i ng
overa l l tr i p ti mes, read i n g cl ockw i se:
5 0, 7 5, 100, 200, 300, 400, 5 00
( mi l l i s econd s ) .
The "A" s i gn i fi es a con t i nuous l y adjus tabl e pi ckup t i me del ay i n t h e ra nge o f 50 to
""""'·
500 mi l l i seconds.
The " 0" s i gn i fi e s tha t the t i me r res e ts "i n stantaneous l y" ( i n
re al i ty, i n l e ss than 200 m i l l i seco nd s ) .
2 2
www
. ElectricalPartManuals
. com
