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c an trip ins t an t ly .
one or two
the
sy s t em swings in pha s e ,
the back c ont ac t s ,
t r i p c ir c u i t without wai t ing for the r e s e t of
On a thr e e- pha s e faul t ,
c ontac t s wi l l r e s e t ,
wlll not o c cur unt i l af t e r the
X2
t ime d e lay .
py
t h e o p ening
t ac t s ,
RRB .
the back-up t r i p p ing through D,
b lo cked
c as e ,
back- up pro t e c t ion
during out - of- s t e p
rang e d ,
how,ever ,
made
o n the o ther
t ac t s ,
and
c annot b e prevent ed f or a p e r i o d
the t ime
ADD IT I ONAL USES FOR THE C ARRIER CHANNEL
ab ove ,
t h e c ar r i e r channel can b e u s e d for o ther
func t ions
c ommuni c at i on,
t r i pping .
f r om the
K3
t a c t
t o the aux i l iary
in Figure
pendent ke ying
other fun ct i on s .
the
re l ay
ary st art
in p l a t e
minimum .
from r inging
u s e d
f o r aux i liary
t ime de lay c ircuit
each t e rmina l .
bination
thru c o nt ac t s
When t e lemet e r ing impuls e s
• l
On phas e- t o - phase
of
the Z3 c on t ac t s
thus
A,
B ,
or C
however ,
and c on s e quent ly ,
expiration of the
The r e s e t of
X2
of t h e r e c e iver r e l ay
It wi l l be n o t e d
f r om Figure l
by the
out - of - s t e p c ontac t s ,
on thr ee- phas e f ault s
is
not p o s s ib l e .
so
tfiat T3 c onne c t ion c an
s id e
o f the out- of- s t ep c on
in this c as e ,
tr ipping on out- of- s t e p
s e t t ing of T 3 .
In add i t i on
t o
r e laying
such as
t e l emet er ing
sup e r v i s ory
c ontr o l
For t he s e func t i on s ,
p l ate
i s br ought
out
st art
c on t a ct s as
1 .
Thi s arrangement
c ontact
for
re l aying
K3
The
re l ay
start
c ontact s
to
open up the
c ont act
in orde r t o ke e p the
v o l t age
of the
o s c i l l at o r
In order to
prevent
the
4
during the
ime c arrier
t e l emeter ing func t i on,
3
of Figure
Thi s c ircuit c o ns i s t s of a c om
of r e s i s t o r s and a C?pac i t o r ener g i z e d
on a n
auxiliary
are b e ing s ent or re-
CARRIER
RELAYING
fault s ,
c e iv e d ,
wi l l r e s e t
when
c e iver plate c ir c u i t
a llowing
one
of
pul s e .
to
c ompl e t e
the
TV,
X2 .
c ir c u i t
none of
the
Z3
par a l l e l with thi s
t r ip p ing
s i s t ing of a r e s i s t o r
c ar r i er a larm e lement .
is made p o s s ib l e
. c it o r s are cho s e n
back c on
c a s e .a maximum d e lay
c an b e obtained .
the longe 3t t e lemeter ing impul s e .
that
and T3
is
shown
in
which
of the push but t o n ,
the push button c lo s e d
It
is
ar
t o · c aus e the alarm e lement
b e
g i z ing c arrier
the normally c lo s e d c o ntac t ,
the c harge
o f longer than
alarm e lement
c ontac t marked " alarm"
s ound .
and c apac i t o r ,
c an be obtained f o r the
d e s c r ib e d
l o ad
c ontro l ,
instantane ou s ly
and remote
r i e r by u s ing the
a s eparate l e ad
the
thru a back c on
c ontact
shown
p r ov i de s
inde
and
the
t i on is normally s up p l i e d
i s
e n e r g i z e d
by
laying
auxi l i
a hand s e t
variat i on
s w it chboar d ,
tube
to
a
wir e d to
of c ommunic ation i s
c arrier alarm
pushe s a switch
i s
b e ing
and c onne c t the m i c r o phone t o the carrier trans
the
m i t t e r .
c an be u s ed
at
tor r e le a s e s
i s p lugged
c ar r i e r alarm c ir c uit
t y p e
T V r e lay .
ing during c onver s a t i on .
u s e d f o r c o d e r inging .
- 5 -
the c o i l of the type TV re lay i n the �e
i s energ i z e d
Thi s caus e s
the normally c lo s e d c ontac t ,
t o alt ernat e ly open and c lo s e energiz ing the
thru a r e s i s t or
and
c apac i t or ,
and the
The r e s i s t o r s and c apa-
so
that
of approximat e ly
Thi s wi l l prevent
I f i t i s d e s ir e d
i t
is
only nec e s s ary to hold
f o r a period
thru the push
on the c apac i t o r
w i l l d r o p out ,
and c aus ing
B y p r o p e r l y proport ioning
a wide range
alarm e lement .
The
alarm b e l l
c an be made
whe n e v e r the re l ay s
PG
type
c a r r i e r
re lay
start
c i r cuit
i n the a l arm c o i l c i r cuit .
Emergency
po int- t o - p o int
with the
equipment .
This c an be done by plugging
at
the
c ar r i er
or
from
a d e sk
the equipment .
The push- t o - t a lk
employed
on the hand s e t to
During the
l i s tening p e r i o d ,
svit ch ,
Whenever the
e
. � .;;
:
l i f t e d from t h e d e sk s t and,
, ·
'
is
opened t o prev ent r ing
Thi s
on each
im
a c apac i t o r .
In
i s a c ir c uit c on
AL
c o i l
of
the
f or thi s
p ar t i c ul ar
2
s e c onds
o p.eration on
t o s ignal
by
means
long enough
to
drop out .
Ener
button
maintains
TV,
open and when
is u s e d up ,
the
c l o s ing i t s
b ac k
t h e b e l l
t o
t h e
r e s i s t o r
of drop- out
t ime s ·
to
operate
start
car
re lay
c onne c t ing
in
w it h
it s b a c k
c omm1mic a
c ar r i er r e
s e t ,
at
the r e l ay
s e t
permanently
type
whe r e the operator
s tart c arrier
the opera
hand s e t
the
alarm c ircuit i s
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