Allis-Chalmers BWX-6637-5, Instruction Book

Page: 49 / 88

EXAMP LE :
-----....-.
B rea ke r rat i ng
a s
per F i gure ]A .
Phase p i ck-up s e t t i ngs
1 1A 1 1
( 200 Amps) . Long t i me band s e t t i ng I s
on AAX I MUM .
Shor t t i me band s e t t i ng I s on
M I N I MUM . T r an s f e r
t o
short t i me I s set a t l OX .
Cu r ren t s between 200
t>mps and
2000
Amps
w l 1 1 t r i p the
breake r after
a
t i me de l ay de f i ned by t he max i mum
l ong
t i me c
u
r v
e
(Fi gure 70) .
Cu r re n ts above
2000 Amps
wl 1 1
t r i p t he b
r
ea
k
e
r i n
the t i Te I nd i ca ted by the
m i n i m um
s hor t t i me curve .
I f
t he phase p i ck-up s e t t i ngs were changed t o · � · ·
(250 Amps ) , t hen the
short
t i me band wou l d be u s ed for
cu r rents
of
2 50 0 Amps and a bove .
- 1 6 ..
(
c
(