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Set up the AC, DC a nd o sci l l o scope co n n ect i o n s s h own i n F i gu re 36.
cu rre nt to the g ro u nd ci rcu i t on the 0. 5 tap at X I ba se p i ckup.
fo l l ow i n g two cau t i o n s :
1 .
The system side circuits of the BFT contacts must her removed before
the
test
recommended
2 .
The oscil l oscope must not be grounded.
cord adapter .
reference is n ear
about l / 2 DC potential.
To ch eck or s e t the t i me r, u s e t h e fo l l ow i n g procedu re :
Set the test cu rre n t i n to t h e re l ay a t 5 X p i ckup.
F i g u re 36, the scope t race i s
tr i gge r i n g the scope, t h e t r i g g e r fea t u re shoul d be ope ra ted i n t h e a t tenua ted mod e.
After the t i mer u nd e r te st has t i med o u t and the B FT rel ay ha s ope ra ted, the B FT
co n tacts cl o se a nd
i n i t i a t i on u n t i l the s i gnal goes to zero i s the bre aker- fa i l u re tr i pp i n g t i me.
Fo r spec i fi c re l ay t i me r s e t t i n g s, fo l l ow t h e s ubs e qu e n t i n s t ruct i on.
Note t h a t the A/0 t i mer rheo s ta t i s i de n t i fi ed as s u ch,
i ncre a s e s the t r i pp i n g t i me.
1.
S B C2 3 A (A/0)
B FI con tact.
Lock the rheosta t pos i t i on a nd ch eck s e v e ra l t i mes t h a t t h e t r i pp i n g t i me i s
con s i s te n t.
2 .
S B C2 3 B (A/0)
appli ed to the S B C23A.
3 .
S B C 2 3 C ( A/0)
app l i ed to the S B C2 3A.
LOGIC FUN CTIONS, SETTINGS AND TESTS
Ha v i n g s e t t h e current d e tecto rs and t h e A/0 t i me r, pe r fo rm t h e fol l owi n g te s ts
u s i n g the F i g u re 35 te s t c i rcu i t fo r the I A con fi gu ra t i on.
1. 5X c u r re n t d etecto r p i ckup.
S B C2 3 A
Pl ace t h e "IT" l i nk i n t h e " OUT" pos i t i o n a nd app l y te s t cu rrent to the
rel ay.
Wi th an ohmme ter acro s s rel ay termi n a l s #11 a nd #12, cl o s e a nd open sw i tch
( Sl ) a nd ch eck t h a t t h e o hmme ter co n t i n u e s to read i n fi n i te o hms.
GEK-45464
connections
are
}
.
The
reason
( - }
DC potential and ground potential is generally
i n i t i a ted.
th e
scope
trace
In i t i a te t i m i n g o f the re l ay a s expl a i n ed above, by cl o s i n g th e
Set the l en g t h o f tr i pp i n g t i me by adju s t i n g the A/0 r h e o s ta t.
Pl ace t h e " t i me r l i nk" i n the " OR" mod e a n d u s e the same test
1
Set "IN/OUT"
i nk i n t h e OUT" pos i t i o n a nd u s e the same te st
(
made
use
of
a n
Use a three-to-two-prong power
for
this
latter
caution
Upo n cl o s i n g the B FI co n tact o f
No te tha t s i nce ra ted DC vol ta ge i s
goes
to
" 0 "
v o l t s.
2 3
Appl y the
Obs e rve the
XLA
test
plug
is
is
that
rel ay
The
t i me
from t race
a nd cl ockw i s e rota t i o n
Le t the te st cu rrent be
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