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CARRIER RELAYING
CARRIE R CONTROL
POS.
TEST
BUTTON
PUSH
AL
TELEPHONE
RECEIVER RELAY
-
COILS RRH {HOL DING) AND RRT
(TRIPPING) CONTACTS RRG, RRP, RRB.
Fig.
c�rrier relays consists
3
HZ
Ty r; e
il:'l p edance
for phase faults.
HRK
(
l Type
current
(
)
Potential Polarized
Overcurrent Ground Relay.
or
l Type
RS
RSN Carrier Auxiliary Relay.
l
Type
CO, CR, CRC, CWC or CWP Ground Back
up Relay.
The type
RSN
relay with the Type HZ Relays
provides
out-of-synchronism
HZM
Type
Relay with the Type RS Relay provides
swing
or
synchronism surge blocking, but not
out-of-slep
blocking
tance elements.
2.
d-e carrier transmitter-receiver
A
the transmitter controlled by the fault detec
ting
and directional relays, and the receiver
2
CARRIER
TRANSMITTER
I-
Simplified D-C Schematic Of The Carrier Relaying Scheme.
of:
HZM
G£'
Distance Relays
HRP
)
polarized
or Type
Carrier
Directional
blocking.
The
without additional dis
set,
TRIP
+
NEG.
CWP
CO,CR,CRC, ewe,
GROUND BACK·UP RELAY
GROUN
B
c
TIMER
DIRECTIONALLY CONTROLLED BY D AND
�p�r�te
a
receiver relay included
to
Type RS or RSN relay.
JY
tho
cr
Type FD Carrier Set.
3. A
coupling
capacitor
for
iliary
introducing
onto
the transmission line.
plied
with
a potential
line-to-ground potential or
for measuring three phase line potentia
Carrier Coupling capacitor is the Type PC, and
with
the potential device, is usually the Type
PCA.
4.
A Line Coupling Tuner.
to
tune
out
the capacitance of the coupling
capacitor
and
match
ceiver circuits to the transmission line.
tuner
is
a
part of the carrier set when the
transmitter-receiver
mounted
is
separately
capacitor when the transmitter-receiver is lo
cated indoors some distance from the tuner.
5. A
Line
trap to prevent short circuiting
CIRCUIT
C
B
A
RRB
r::
Z3
in
the
This is either the Type
with carrier aux
the carrier frequency
This
be
may
sup
device for measuri�g
3
sets can be used
�
.
The
This unit is used
the
transmitter or re
The
is
mounted outdoors, or
near
the coupling
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