Advertisement
CARRIE R RELAY ING
CARRIER CONTROL
POS.
TEST
�
PUSH BUTTON
AUX. CARRIER START
TELEMETERING, SUPERVISORY, ETC.
TELEPHONE
AL
RECEIVER RELAY
-
COILS RRH {HOLDING) AND RRT
(TRIPPING) CONTACTS RRG, RRP, RRB.
Fig. !-Simplified D-C Schematic Of The Carrier Relaying Scheme.
carrier relays consists of:
Type
impedance
3
H Z
for phase faults.
Type
(current
polarized) or Type
l
HRK
(
Potential Polarized)
Overcurrent Ground Relay.
l Type
RS
or
RSN Carrier Auxiliary Relay.
Type
CO, CR, CRC, CWC or CWP Ground Back
l
up Relay.
The type
RSN
relay with the Type
provides
out-of-synchronism
Type
Relay with the Type RS Relay provides
HZM
swing
or
synchronism surge blocking, but not
out-of-s " t ep
blocking
tance elements.
2. A
d-e carrier transmitter-receiver
the transmitter controlled by the fault detec
ting
and directional relays, and the receiver
2
NEG.
CARRIER
TRANSMITTER
or
Distance Relays
H Z M
HRP
Carrier
Directional
Relays
HZ
blocking.
The
without additional dis
set,
TRIP CIRCUIT
+
CO,CR,CRC, CWC, CW
P
GROUND BACK-liP RELAY
D
ON
LL
TIMER
C
I
I
RE
T
A
Y
CONTROLLED
a
to
c,perc;. t e
receiver relay included in the
•Type RS or RSN relay.
JY
or the Type FD Carrier Set.
3 .
coupling
capacitor
A
iliary
for
introducing the carrier frequency
onto
the transmission line.
plied
with
a potential
line-to-ground potential or
for measuring three phase line potential.
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
is
separately
mounted
capacitor when the transmitter-receiver is lo
cated indoors some distance from the tuner.
5.
A
Line
trap to prevent short circuiting
BY
Z3
D AND
This is either the Type
with carrier aux
This may be sup
device for measuri�g
sets can be used
3
The
This unit is used
the
transmitter or re
The
is
mounted outdoors, or
near
the coupling
Advertisement
