.. . .
. ·, ,
I
I.
2 .
B
re
a
k
e
r
The mechan i sm of
t h e
electrlca lly -oper�t ed ·
b reaker
i s
t
h
e
'arne as t ha t of t he
man u a l l y -opc r� t ed
b
r
e
ak
e
r
except t
h
a
t
the
manua l c l os i n g hand l e
1 5
rep l aced
by
an e
l
e
c
�
r
l c
mot o r
and the
gear
s ys t em .
Ref e r to F i g u res 2A
a n d
3 .
M
o
v
e
m
en
t
of t h e con t ro l s w i tch
( N )
l
o
c
a
t
e
d
on t h e f ron t of t h e b reake r to the "ON" pos i t i on , when the con t ro l c i rcu i t
I s energ i zed , w i l l s ta r t the
a u toma t i c
c l os i ng cyc l e .
Moto r gear
box
p i n i on (238) rota tes gea r (235) coun t e r c l ockw i s e , end p i ns
( 2 3 6)
move
ac ros s t he t op of f l a t b i as i ng s p r i ng ( 2 34) . Th i s ra i se s t og g l e l i nkage
(237) ove r cen ter and pos i t i ons gea r
( 2 3 5 )
to mes h w i th gea r
s egme n t
(240) .
S i nce th i s gea r s egment I s a
t
t
a
ched
to c � os l ng cam
( 2 1 0) ,
the
s t ored·energy s pr i ngs a re cha rged and l a t ched i n
t h e
s
a
m
e
s equence as
des c r i bed i n
the
prev i ous s ec t i on . The l ower ex�ens i on o f c
l
o
s
i
n
g
cam
(2 1 0)
e
n
g
a
g
e
s
a
r
o
l
l
e r
on t
o
gg
l
e
l i nkage (237) to
d i
s
e
n
g
a
g
e gea r
(235)
f rom
gea r s e gmen t (24o)
a f t e r t h e s tored-ene rgy � pr i ngs
a re l a t ched
I n t h e
cha rged pos i t i on by s p r l ng•re l ease l a t r. h (202) .
'
S p r i n g - pos i t i on
s
w i tch
(230) (SPS
b)
I s
a
c
t
u
a
te
d
.
t
o the
open pos i t i on
by
a rm ( 23 1 ) a t t ached to l i nk ( 225) as the s t ored·e�e rgy s p r i ngs
a
p
p r
o
a
c
h
the
cha rged pos i t i on , Th i s sw i tch I n i t i a tes the ' s p r i ng
recha r g i n g
cyc l �
and i s connec ted i n pa ra l l e l w i t h mot o r cu t -off sw i tch (232) (88a) wh i ch
I s
op
e
n
i n i t i a l l y , c l os es wh l l e the mo tor charges the s p r i ngs , and opens
when the s p r i ngs a re cha r ged w i th the
gea r i ng
d i senga ged .
The
mo tor
cu t
o f f sw i t ch i s ac t ua ted
by
the movemen t o f p l unge r ( 2 3 3) ove r p i ns (236) .
App rox i ma te l y twe l ve s econds
a re
requ i red for comp l e t i on of t h e
s p r i ng
cha rg i ng cyc l e.
:
The b reaker
may now be
c l os ed by
pus h i ng down 5 P r i ng- re l ea s e l a t ch hood
(202A) as i n the manua l l y -ope ra ted b reake r , or I t ma y be c l os e d e l ec t r i
ca l l y t h rough remote c l os e con t ro l sw
i
t
c
h
(
CSC
)
.
1
Th i s sw i t ch
ene r g i zes
s p r i ng•re l ease co l
I
(
SRC
)
wh i ch moves p i n
(
2
4 1
)
l n · a
coun te r c l ockw i s e
d i rec t i on t o t r i p s p r i ng re l ease l a t c h hood (202A) and s p r i ng- re l ease
l a t ch
( 2 02) .
The
"Y"
co i l i s ene rg i zed s i mu l taneo us l y w i t h the
s p r i n g
re l ea s e col I and causes t h e
1 1Y11
con t ac t
t o open t he circu i t t o
t
h
e
mo t o r .
S i nce t he
' 'Y"
re
l
ay
w i I I
r
em
a i
n ene r g i zed as l on g a s the
remot e c l ose
con t ro l swi tch ( CSC) i s he l d
c
l
o
s e
d
,
"Y 1 1 1 con tac t
keeps
t he
mo tor
c i r c u i t
open to
p reven t
"pump i ng" o r repea t ed a t t empts to: charge t he
s
t
o
re
d
ene rgy a p r i ngs
when the b reaker
i s
c
l
os i
n
g .
Af t e r t he s tored-energy s p r i ngs a re
d i s cha r ged ,
t
h
ey a re a u toma t i ca l l y
recha r ged as
l ong
as th
e
con t ro l c i rcu i t
i
s
energ i zed ,
and the co
n
t r
o l
swi t c h (N) I s i n
t h e "ON' '
p
o
s i
t
i
o
n
.
F i gu re
3 shows
t
h
e s p r i ng-pos i t i on
swit ch
(SPS I·b)
c l os ed
t o comp l e t e the
mo tor co
n
t
r
p
l
c
i r
c
u
i
t
as
I t
wou l d
be when
the
� p r i ngs
arc d i s cha rged .
TAB LE 2
Charg i n g S p r i ngs :
C l os i ng :
OR
T r l pp i ng :
--
OR
OPERAT I NG PROCEDURE
E LECTR I CALLY-OPE RATED BREAKERS
Ene r g i ze con t ro l c i rcu i t . Hove cpn t ro l sw i t ch
(N)
on
f ront o f breake r to
"ON"
pos i t i on �
A f t e r
spr i ngs
a re cha rged , ac tua t� remot e c l os e con t ro l
swi t ch ( CSC) .
i
Push
down
s p r i ng-re l ease l a tch hopd
(202A) .
Ac t ua t e remo te t r i p con t ro l swi tch ( CST) .
Push i n
m
a
n
u
a l t r i p
rod
(207) .
\
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