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CARRIER RELAYING
CARRIER CONTROL
.CA
IE
ST
RT
AUX
RR
R
A
JJ#i����.1�c
�.
K3
PHASE
A
B
c
TELEPHONE
RECEIVER RELAY-COILS RRH
CONTACTS
Fig. 1-Simplified D-C Schematic of the Carrier ftelayinq Scheme.
of carrier f o r
e xt e rnal fault s .
of car r i e r re lays c on s i s t s o f :
3 Type HZ
impe dance or
for phase fau l t s .
Type HRK
( current p o l a r i z e d )
1
{ P o t e nt ial P o l a r i z e d )
Overcurrent Ground Re lay .
1
Type RS or RSN Carr i e r Auxi l iary Re lay
l Type C O , C R , CRC , CWC
up Re lay
The t��e
RSN re lay with the
pr ovide s
out - o f - syn chron i sm
Type HZM Re lay w i t h the Type RS Re lay p r ovide s
swing
or synchr oni sm surge b l ocking ,
out - o f - step
b l o cking without
t ance e l ement s .
2 .
A d - e
c a r r i e r t ransmit t e r - r e c e i v e r s e t ,
the t ransmi t t e r c ont r o l l e d by the fau l t d e t e c
t ing and
d i r e c t i ona l r e l ay s , and the re c e i v e r
t o
ope rate a
re ce i v e r r e l ay i n c luded in
Type
RS o r
RSN r e l ay .
2
CAR RIER
RECEIVER
RRT(rRIPPING)
8t
RRG, RRP, �RB.
One t e rminal
HZM Di stance Re lays
or Type HRP
Carr i e r
D i r e c t i onal
or CWP Ground Back
Type HZ Re lays
b l o cking .
The
but not
add i t i onal d i s
the
Type JY
Thi s is the
TRI P CIRCUIT
+
CWP
ewe,
CO,CR, CRC,
GROUND BACK·UP RELAY
A
PHASE
B
c
TIMER
DIRECTIONALLY CONTROLLED BY D AND
Carrier Set .
3 .
A coup l ing
capa c i t o r w ith
i l iary f o r int roduc ing
ont o the t ran smi s s i o n l ine .
p l ied
with a
p ot e n t i a l d e v i c e
line - t o -gr ound p ot e nt ial o r 3 s e t s can be u se d
f o r measuring three phase l ine p otent ial .
Carrier C oup l ing capa c i t o r i s the Type PC , and
w i t h the p o t e nt i a l d e v i c e , i s u sually the Type
P CA .
4 .
A Line
C oup l ing
u s ed t o tune out
the capa c it ance o f the c oup
l ing capac i t o r and mat ch
r e c e i v e r
c i rcuit s t o
The tuner
i s a part
of the
the t ransmi t t e r - r e c e i v e r
o r i s
separat e ly
mount e d
capac i t o r
when the
t ransmit t e r - r e c e i v e r
l o cat e d ind o o r s s ome di stance f r om the tune r .
5.
A
Line t rap
t o pre vent
ing the
carr i e r
t ransmit t e r output during
nearby
external fault
t o
which the
carrier i s c oup l e d .
u sual ly the
Type P ,
such a s type s P 4 0 0 , P 8 0 0 ,
PDF4 0 0 , PDF800 .
+
Z3
carrie r aux
the carrie r
frequency
Thi s may ba sup -
f o r me a sur ing
The
Tune r .
Thi s un it
i s
the
t ransmi t t e r
o r
the
t ransmi s s i on l i ne .
carr i e r set when
i s mount ed out d o o r s ,
near the
coup l ing
i s
short c i rcuit
a
on the same pha se w ir•e
The se
are
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