Settings - GE SBC23A Instructions Manual

S i nce a l l the SB C rel ays have no DC vol t a g e appl i e d un t i l a fte r the a s soc i a ted l i ne
(
re l ays ope ra te see Fi gures 2 , 3 a nd 4 ) , t h e re \'J i l l be s ome s l i g h t ope ra t i n g del ay
i n the p i ckup o f t h e cur re n t de tector.
ope ra t i ng t i mes a s a funct i on o f curre n t a s a mul t i pl e o f p i ckup s e t t i n g.
va r i a t i o n i n t i me is a re sul t o f the i n s ta n t i n the current cycl e at w h i ch the D C i s
appl i ed.
No te t h a t these curves appl y fo r s i n g l e -phase faul t o r s i n g l e -phase te s t
cur ren ts. For th ree-pha s e faul ts o r th ree-phase te s t cur ren ts, t h e m i n i mum t i me
curve w i l l app l y, re g a rd l e s s o f the i nci d en t a n g l e o f t h e curre n t a t the i n s ta n t t h e
D C i s appl i ed.
The fo l l ow i n g s e tt i n gs mus t be made i n a l l the S B C rel ays cov e red by th i s book.
s e t t i n gs s houl d be mad e i n t h e o rd e r i n wh i ch they a re l i s ted be l ow.
Curre n t d etec to r fi l l - i n t i me r s e t t i n g
1.
2 . Ma i n t i me - d el ay s e t t i n g
Seco n d a ry t i me-del ay s e t t i n g
3.
4. P h a s e curre n t p i ckup s e t t i n g
Ground curre nt pi ckup s e t t i n g
5 .
6 . L i nk po s i t i on s e t t i ngs
The sect i on und e r
o f s e t t i n gs fo r
pa r t i cul a r mod el
s ect i o n s under OPERATION - GENERAL.
Th e re a re re a s o n s for t h e o r d e r l i s ted above i n wh i ch t h e s e t t i n gs s h oul d be ma d e.
T h e s e rea sons a n d o t h e r con s i d e ra t i on s a re noted bel ow.
It i s i mpo r ta n t t h a t t h e fi l l - i n t i me r s e t t i n g be ma d e fi rst becau se, a s expl a i ned
i n t h e s ect i on under
va ry, d epend i n g on
exactl y h ow th i s s e tt i n g sh oul d b e ma de o r checked.
The n ext s e t t i ng to be made i s the t i me d el ay of the ma i n t i me r.
fi e l d, t h e S B C re l ays do not norma l l y h a v e D C vol ta ge app l i ed, t h e cur re n t de tector s
a re no t ope ra t i ng, r e g a rdl e s s o f ma g n i tud e o f c u r re n t, un t i l B FI o r 6 2X co n tacts
cl o s e to appl y DC.
n ece s s a ry fo r the faul t d etec to rs to p i ck up.
s e t the ma i n t i mer so tha t t h e o v e ra l l t i me, from the i n s t a n t t h e DC vol ta ge app l i ed
to the re l ay unt i l a n output i s obta i ned from t h e B FT co n tacts, i s equal to the
d e s i red t i me del ay.
to appl y i n g t h e DC.
The ma g n i tud e of th i s cu rre n t i s a n i mpo r ta nt co n s i d e ra t i o n at th i s s e t t i n g.
t h e cu r rent de tector ca n n o t p i ck up u n t i l t h e i n s tan tan eous magn i tude o f t h e i nput
( )
A/0
(
B/0
i tem i ze s t h e co ns i d e ra t i o n s i n vol ved in the s e l ect i on
APPLICATION
i terns 1-5 above.
a nd the use r's pre fe re nce.
CHARACTERISTICS,
th i s s e t t i ng.
Th i s means t h a t be fo re the t i me r can
Th i s te s t mus t be pe r formed w i th current i n to t h e re l ay pr i o r
GEK-45464
F i gure 2 2 i nd i ca te s t h e max i mum and mi n i mum

SETTINGS

)
The po s i t i o n s o f t h e
These h ave bee n d escr i bed
the p i ckup range of t h e cur re n t d e t ecto r w i l l
The s ect i o n und e r
Fo r th i s reason, i t i s n ece s s a ry to
14
1
i nks depend
d escr i be s
ACCEPTANCE TESTS
S i nce, i n t h e
s ta rt t i mi n g
The
The
o n the
i n the
i t i s
S i nce